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2001 Volume 12 Issue 11
2001, 12(11): 941-942
Abstract:
Excellent yields and purity were obtained in the aqueous medium Suzuki, Sonogashira, Stille and Heck reactions using palladium (Ⅱ) as catalyst in liquid phase synthesis. Polyethylene glycol (PEG) acted as soluble polymeric support and phase transfer catalyst as well.
Excellent yields and purity were obtained in the aqueous medium Suzuki, Sonogashira, Stille and Heck reactions using palladium (Ⅱ) as catalyst in liquid phase synthesis. Polyethylene glycol (PEG) acted as soluble polymeric support and phase transfer catalyst as well.
2001, 12(11): 943-944
Abstract:
The substitution reaction between gem-diacetates and allylsamarium bromide was investigated, and homoallylic alcohol acetates were obtained in moderate to good yields.
The substitution reaction between gem-diacetates and allylsamarium bromide was investigated, and homoallylic alcohol acetates were obtained in moderate to good yields.
2001, 12(11): 945-946
Abstract:
In the presence of metallic samarium-cobalt (Ⅱ) chloride hexahydrate, the nitrones can be reduced to the corresponding imines in moderate to high yields under mild and neutral conditions.
In the presence of metallic samarium-cobalt (Ⅱ) chloride hexahydrate, the nitrones can be reduced to the corresponding imines in moderate to high yields under mild and neutral conditions.
2001, 12(11): 947-950
Abstract:
Several aromatic ring-substituted N-acetyl-phenylalanine methyl esters were treated with POCl3 in refluxing benzene, which is the typical condition of B-N reaction. It was found that the normal B-N product 3, 4-dihydroisoquinoline-3-carboxylic acid methyl ester and/or 5-benzyl-2-methyl-4-methoxy oxazole could be obtained. The result depended mainly upon the electron-donating property of the substitutes on the benzene ring. Strong electron-donating groups located at para-or ortho-to the cyclization site will facilitate the formation of the normal B-N product 2. On the other hand, the absence or weak electron-donating groups tended to yield the oxazole product 3. It was established that the formation ofbenzyl oxazole is the competitive path with the B-N reaction. In this article, an explanation was given based on the mechanism of Bishler-Napieralski reaction.
Several aromatic ring-substituted N-acetyl-phenylalanine methyl esters were treated with POCl3 in refluxing benzene, which is the typical condition of B-N reaction. It was found that the normal B-N product 3, 4-dihydroisoquinoline-3-carboxylic acid methyl ester and/or 5-benzyl-2-methyl-4-methoxy oxazole could be obtained. The result depended mainly upon the electron-donating property of the substitutes on the benzene ring. Strong electron-donating groups located at para-or ortho-to the cyclization site will facilitate the formation of the normal B-N product 2. On the other hand, the absence or weak electron-donating groups tended to yield the oxazole product 3. It was established that the formation ofbenzyl oxazole is the competitive path with the B-N reaction. In this article, an explanation was given based on the mechanism of Bishler-Napieralski reaction.
2001, 12(11): 951-954
Abstract:
5-Substituted hexahydro-1H-1,4-diazepine analogues were synthesized starting from N, N'-dibenzyl-1, 2-ethylenediamine and methyl 2, 4-dibromide butyrate through nucleophilic substitution, reduction, chlorination, debenzylation and amidation. Bioactivity tests showed that 9a had the highest agonist activity.
5-Substituted hexahydro-1H-1,4-diazepine analogues were synthesized starting from N, N'-dibenzyl-1, 2-ethylenediamine and methyl 2, 4-dibromide butyrate through nucleophilic substitution, reduction, chlorination, debenzylation and amidation. Bioactivity tests showed that 9a had the highest agonist activity.
2001, 12(11): 955-956
Abstract:
A convencient and stereospecific synthesis of (Z)-benzylidenephthalides, including thunberginol F, from phthalides is described.
A convencient and stereospecific synthesis of (Z)-benzylidenephthalides, including thunberginol F, from phthalides is described.
2001, 12(11): 957-958
Abstract:
A facile synthetic route for two chalcone analogues was developed. The key step was selective deprotection of MOM in aryl methyl ether 6 by silica gel.
A facile synthetic route for two chalcone analogues was developed. The key step was selective deprotection of MOM in aryl methyl ether 6 by silica gel.
2001, 12(11): 959-960
Abstract:
This letter reports a novel method for preparing chromogenic calix[4]arenes, in which the 4-aminopyridine was diazotized with isoamyl nitrite in EtONa/EtOH, and mono(azo)-, bis(azo)-and tetra(azo)-substituted calix[4]arenes were obtained as main product respectively by diazo-coupling in different molar ratio to calix[4]arene in non-aqueous solution at 0-5℃.
This letter reports a novel method for preparing chromogenic calix[4]arenes, in which the 4-aminopyridine was diazotized with isoamyl nitrite in EtONa/EtOH, and mono(azo)-, bis(azo)-and tetra(azo)-substituted calix[4]arenes were obtained as main product respectively by diazo-coupling in different molar ratio to calix[4]arene in non-aqueous solution at 0-5℃.
2001, 12(11): 961-964
Abstract:
An efficient, convergent and enantioselective synthetic approach to the trihydroxy core structure 2 of Taurospongin A 1 is described. The featured step is a classic Wittig coupling reaction between C1-C4 aldehyde segment 4 and C5-C10 phosphate salt segment (5).
An efficient, convergent and enantioselective synthetic approach to the trihydroxy core structure 2 of Taurospongin A 1 is described. The featured step is a classic Wittig coupling reaction between C1-C4 aldehyde segment 4 and C5-C10 phosphate salt segment (5).
2001, 12(11): 965-966
Abstract:
Two novel dimethylgallium complexes were synthesized and their structures were elucidated by elemental analysis, 1H NMR, IR and MS spectra.
Two novel dimethylgallium complexes were synthesized and their structures were elucidated by elemental analysis, 1H NMR, IR and MS spectra.
2001, 12(11): 967-970
Abstract:
A linear α-D-(1→3)-glucan, named PSG, was obtained from the spores of Ganoderma lucidum. The synthesis of positively and negatively charged polyelectrolytes from PSG was developed. Amine groups and carboxymethyl groups were introduced through nucleophilic substitution with 3-chloropropylamine or chloroacetic acid, respectively. Reaction conditions were varied to obtain insight into the influence of variables on the degree of substitution.
A linear α-D-(1→3)-glucan, named PSG, was obtained from the spores of Ganoderma lucidum. The synthesis of positively and negatively charged polyelectrolytes from PSG was developed. Amine groups and carboxymethyl groups were introduced through nucleophilic substitution with 3-chloropropylamine or chloroacetic acid, respectively. Reaction conditions were varied to obtain insight into the influence of variables on the degree of substitution.
2001, 12(11): 971-974
Abstract:
Time-resolved Fourier transform infrared emission spectroscopy is employed for studing gaseous reaction of CH3 with NO. The CH3 radical was produced by laser photolysis of CH3Br at 248 nm. The infrared emissions of vibrationally excited nascent products HCO (v3), HCN (v1, v3), NH2 (v3), secondary product HNO (v1) and possible product HNCO (v1) were observed. It verifies that the reaction channels of HCO+NH2 and HCN+H2O exist, and that one other channel HNCO+H may also occur.
Time-resolved Fourier transform infrared emission spectroscopy is employed for studing gaseous reaction of CH3 with NO. The CH3 radical was produced by laser photolysis of CH3Br at 248 nm. The infrared emissions of vibrationally excited nascent products HCO (v3), HCN (v1, v3), NH2 (v3), secondary product HNO (v1) and possible product HNCO (v1) were observed. It verifies that the reaction channels of HCO+NH2 and HCN+H2O exist, and that one other channel HNCO+H may also occur.
2001, 12(11): 975-978
Abstract:
Ba0.5Sr0.5Co0.8Fe0.2O3-ä and Ba0.5Sr0.5Co0.8Ti0.2O3-ä oxides were synthesized by a combined EDTA-citrate complexing method. The catalytic behavior of these two oxides with the perovskite structure was studied during the reaction of methane oxidation. The pre-treatment with methane has different effect on the catalytic activities of both the oxides. The methane pre-treatment has not resulted in the change of the catalytic activity of BSCFO owing to its excellent reversibility of the perovskite structure resulting from the excellent synergistic interaction between Co and Fe in the oxide. However, the substitution with Ti on Fe-site in the lattice makes the methane pre-treatment have an obvious influence on the activity of the formed BSCTO oxide.
Ba0.5Sr0.5Co0.8Fe0.2O3-ä and Ba0.5Sr0.5Co0.8Ti0.2O3-ä oxides were synthesized by a combined EDTA-citrate complexing method. The catalytic behavior of these two oxides with the perovskite structure was studied during the reaction of methane oxidation. The pre-treatment with methane has different effect on the catalytic activities of both the oxides. The methane pre-treatment has not resulted in the change of the catalytic activity of BSCFO owing to its excellent reversibility of the perovskite structure resulting from the excellent synergistic interaction between Co and Fe in the oxide. However, the substitution with Ti on Fe-site in the lattice makes the methane pre-treatment have an obvious influence on the activity of the formed BSCTO oxide.
2001, 12(11): 979-982
Abstract:
This letter compared catalase-, peroxidase-and cytochrome P450-1ike catalytic activities of 15 water-soluble metalloporphyrins produced from Fe, Mn and Co ions and 5 porphyrins. The metalloporphyrins with Fe and Mn as central ions show relatively high catalytic activities of catalase and peroxidase at pH 11.0. Only Mn-meso-tetrakis (4-N-methylpyridinium) porpho-phine of the 15 metalloporphyfins exhibits high cytochrome P450-1ike activity. Effects of imidazole on the catalytic reactions were also studied.
This letter compared catalase-, peroxidase-and cytochrome P450-1ike catalytic activities of 15 water-soluble metalloporphyrins produced from Fe, Mn and Co ions and 5 porphyrins. The metalloporphyrins with Fe and Mn as central ions show relatively high catalytic activities of catalase and peroxidase at pH 11.0. Only Mn-meso-tetrakis (4-N-methylpyridinium) porpho-phine of the 15 metalloporphyfins exhibits high cytochrome P450-1ike activity. Effects of imidazole on the catalytic reactions were also studied.
2001, 12(11): 983-986
Abstract:
The energy transfer efficiency between carotenoids and chlorophyll depend on temperature and viscosity of the media. A 3.5 ps process was detected by the pico-second time-resolved spectra and the process was proved to be regulated by electron exchange mechanism.
The energy transfer efficiency between carotenoids and chlorophyll depend on temperature and viscosity of the media. A 3.5 ps process was detected by the pico-second time-resolved spectra and the process was proved to be regulated by electron exchange mechanism.
2001, 12(11): 987-988
Abstract:
Multi-nuclear NMR and ESI-MS have been applied to study the interactions between oxalato-oxodiperoxovanadate and histidine in neutral solution. Coordination between the complex and histidine was monitored by 51V NMR. A pair of new isomers produced via vanadium atom binding separately to N1 and N3 of the imidazole ring of histidine was characterized by several spectroscopic methods. Experimental results show that the structure activity relationship of peroxovanadium complexes bearing organic ligands may be related to the specific recognition between peroxovanadium and histidine residue of tyrosine phosphatase.
Multi-nuclear NMR and ESI-MS have been applied to study the interactions between oxalato-oxodiperoxovanadate and histidine in neutral solution. Coordination between the complex and histidine was monitored by 51V NMR. A pair of new isomers produced via vanadium atom binding separately to N1 and N3 of the imidazole ring of histidine was characterized by several spectroscopic methods. Experimental results show that the structure activity relationship of peroxovanadium complexes bearing organic ligands may be related to the specific recognition between peroxovanadium and histidine residue of tyrosine phosphatase.
2001, 12(11): 989-992
Abstract:
The voltammetric methods were used to prove the interaction of metal complex Co(phen)33+with bovine serum albumin (BSA). The interaction of BSA with Co(phen)33+molecules using BSA-modified electrode is described. Information of the binding ratio and interaction mode can be obtained from their electrochemical behavior and electrochemical data. Furthermore, attenuated total reflection infrared experiment was performed to prove the interaction between complexes and BSA.
The voltammetric methods were used to prove the interaction of metal complex Co(phen)33+with bovine serum albumin (BSA). The interaction of BSA with Co(phen)33+molecules using BSA-modified electrode is described. Information of the binding ratio and interaction mode can be obtained from their electrochemical behavior and electrochemical data. Furthermore, attenuated total reflection infrared experiment was performed to prove the interaction between complexes and BSA.
2001, 12(11): 993-996
Abstract:
Glucoamylase was immobilized onto novel porous polymer supports containing cyclic carbonate. The relationship between activity of immobilized glucoamylase and the properties of porous polymer supports was investigated. The operation stability and storage stability of immobilized glucoamylase were studied.
Glucoamylase was immobilized onto novel porous polymer supports containing cyclic carbonate. The relationship between activity of immobilized glucoamylase and the properties of porous polymer supports was investigated. The operation stability and storage stability of immobilized glucoamylase were studied.
2001, 12(11): 997-1000
Abstract:
Water-soluble β-alanine C60 adducts were synthesized, and the scavenging ability to superoxygen anion radical O2-and hydroxyl radicalOH were studied by autoxidation ofpyrogallol and chemiluminescence, respectively. It was found that β-alanine C60 adducts showed an excellent efficiency in eliminating superoxygen anion radical and hydroxyl radical. The 50% inhibition concentration (IC50) for superoxygen anion radical and hydroxyl radical were 0.15 mg/mL and 0.048 mg/mL, respectively. The difference should be mainly attributed to the different scavenging mechanisms.
Water-soluble β-alanine C60 adducts were synthesized, and the scavenging ability to superoxygen anion radical O2-and hydroxyl radicalOH were studied by autoxidation ofpyrogallol and chemiluminescence, respectively. It was found that β-alanine C60 adducts showed an excellent efficiency in eliminating superoxygen anion radical and hydroxyl radical. The 50% inhibition concentration (IC50) for superoxygen anion radical and hydroxyl radical were 0.15 mg/mL and 0.048 mg/mL, respectively. The difference should be mainly attributed to the different scavenging mechanisms.
2001, 12(11): 1001-1004
Abstract:
Efficient Ti-catalyzed reductive coupling methodology was first employed to synthesize the symmetrical bis-donor stilbene, trans-4, 4'-bis[diphenyl amino] stilbene (BDPAS). X-ray diffraction analyses reveal that this new crystal belongs to the triclinic crystal system of centro-symmetric P-1 space group. The DBPAS solution, with the linear transmission at wavelength of ≥450 nm, possesses large two-photon absorption cross section as high as 39.4×10-48 cm·s/photon resulting in strong two-photon induced blue fluorescence of 460 nm, pumped by 740 nm laser irradiation.
Efficient Ti-catalyzed reductive coupling methodology was first employed to synthesize the symmetrical bis-donor stilbene, trans-4, 4'-bis[diphenyl amino] stilbene (BDPAS). X-ray diffraction analyses reveal that this new crystal belongs to the triclinic crystal system of centro-symmetric P-1 space group. The DBPAS solution, with the linear transmission at wavelength of ≥450 nm, possesses large two-photon absorption cross section as high as 39.4×10-48 cm·s/photon resulting in strong two-photon induced blue fluorescence of 460 nm, pumped by 740 nm laser irradiation.
2001, 12(11): 1005-1006
Abstract:
This work presents a simple, rapid and reliable supercritical fluid chromatography (SFC) method for a sensitive measurement of orotic acid in human urine. The samples were diluted with deionized water and analyzed directly without any pretreatment.
This work presents a simple, rapid and reliable supercritical fluid chromatography (SFC) method for a sensitive measurement of orotic acid in human urine. The samples were diluted with deionized water and analyzed directly without any pretreatment.
2001, 12(11): 1007-1010
Abstract:
Sparfloxacin can be oxidized by nitrous acid, then react with hydroiodic acid to form a fluorescent derivative. Based on this, a reversed-phase high performance liquid chromatographic pre-column derivatization new method is described for the determination of sparfloxacin in human urine. The linear range is 0.05 mg/L to 4.0 mg/L, the recoveries are 91.5%~95.7% and the RSD is 1.2%~4.2%. The results showed that this method is suitable for the determination of sparfloxacin in human urine.
Sparfloxacin can be oxidized by nitrous acid, then react with hydroiodic acid to form a fluorescent derivative. Based on this, a reversed-phase high performance liquid chromatographic pre-column derivatization new method is described for the determination of sparfloxacin in human urine. The linear range is 0.05 mg/L to 4.0 mg/L, the recoveries are 91.5%~95.7% and the RSD is 1.2%~4.2%. The results showed that this method is suitable for the determination of sparfloxacin in human urine.
2001, 12(11): 1011-1014
Abstract:
A novel amperometric glucose biosensor was constructed by electrochemical formation of a polypyrrole (PPy) membrane in the presence of glucose oxidase (GOD) on the surface of a horseradish peroxidase (HRP) modified ferrocenecarboxylic acid (FCA) mediated sol-gel derived ceramic carbon electrode. The amperometric detection of glucose was carried out at+0.16 V (vs. SCE) in 0.1 mol/L phosphate buffer solution (pH 6.9) with a linear response range between 8.0×10-5 and 1.3×10-3 mol/L of glucose. The biosensor showed a good suppression of inter- ference and a negligible deviation in the amperometric detection.
A novel amperometric glucose biosensor was constructed by electrochemical formation of a polypyrrole (PPy) membrane in the presence of glucose oxidase (GOD) on the surface of a horseradish peroxidase (HRP) modified ferrocenecarboxylic acid (FCA) mediated sol-gel derived ceramic carbon electrode. The amperometric detection of glucose was carried out at+0.16 V (vs. SCE) in 0.1 mol/L phosphate buffer solution (pH 6.9) with a linear response range between 8.0×10-5 and 1.3×10-3 mol/L of glucose. The biosensor showed a good suppression of inter- ference and a negligible deviation in the amperometric detection.
2001, 12(11): 1015-1018
Abstract:
A novel method was established to determine the H2-storage capacity in carbon nanotubes. According to 2NO+2H2 (or 4H)=N2+2H2O reaction, the H2-storage capacity in carbon nanotubes could be calculated. The H2-storage capacity in carbon nanotubes is at least 2.89 wt%.
A novel method was established to determine the H2-storage capacity in carbon nanotubes. According to 2NO+2H2 (or 4H)=N2+2H2O reaction, the H2-storage capacity in carbon nanotubes could be calculated. The H2-storage capacity in carbon nanotubes is at least 2.89 wt%.
2001, 12(11): 1019-1022
Abstract:
In this paper, we demonstrated that the charge-transfer resistance of photoanode can be calculated through the analysis of its electrochemical impedance spectroscopy (EIS) and the photoelectrocatalytic degradation rate of aniline was inversely proportional to the value of charge-transfer resistance of photoelectrodes prepared by thermally oxidation on titanium. The value of charge-transfer resistance is smaller, the higher its photoelectro-activity is.
In this paper, we demonstrated that the charge-transfer resistance of photoanode can be calculated through the analysis of its electrochemical impedance spectroscopy (EIS) and the photoelectrocatalytic degradation rate of aniline was inversely proportional to the value of charge-transfer resistance of photoelectrodes prepared by thermally oxidation on titanium. The value of charge-transfer resistance is smaller, the higher its photoelectro-activity is.
2001, 12(11): 1023-1026
Abstract:
The method of synchrotron radiation small-angle X-ray scattering (SR-SAXS) has been used to obtain structural ;nformation on the system of bis2(2-ethylhexyl) sulfosuccinate (AOT)/ H2O/isooctane. By using the Guinier plot (Ln I (q) versus q2 ) on the data sets in a defined small q range (0.03-0.06Å-1), the gyration radius at different water/surfactant molar ratio, W0, was obtained. With the increase of W0, the gyration radius (Rg) increased at the range of 23.2~52.7 Å.
The method of synchrotron radiation small-angle X-ray scattering (SR-SAXS) has been used to obtain structural ;nformation on the system of bis2(2-ethylhexyl) sulfosuccinate (AOT)/ H2O/isooctane. By using the Guinier plot (Ln I (q) versus q2 ) on the data sets in a defined small q range (0.03-0.06Å-1), the gyration radius at different water/surfactant molar ratio, W0, was obtained. With the increase of W0, the gyration radius (Rg) increased at the range of 23.2~52.7 Å.
2001, 12(11): 1027-1028
Abstract:
The SAMs of 10-[4-(4-phenylazo)naphth-l-oxyl]-l-decanethiol (Compound 1) on gold were prepared. Their molecular structures were determined by surface enhanced Raman spectroscopy (SERS) and reflection absorption infrared spectroscopy (RAIR).
The SAMs of 10-[4-(4-phenylazo)naphth-l-oxyl]-l-decanethiol (Compound 1) on gold were prepared. Their molecular structures were determined by surface enhanced Raman spectroscopy (SERS) and reflection absorption infrared spectroscopy (RAIR).
2001, 12(11): 1029-1032
Abstract:
The overall cross-linking copolymerization of acrylic acid and multi-armed cross-linkers are investigated by in situ interferometry. The results show that the more arms the cross-linkers have, the higher the polymerization rate is. However, they also mean the existence of less cross-linking efficiency and some defects in gel network.
The overall cross-linking copolymerization of acrylic acid and multi-armed cross-linkers are investigated by in situ interferometry. The results show that the more arms the cross-linkers have, the higher the polymerization rate is. However, they also mean the existence of less cross-linking efficiency and some defects in gel network.
2001, 12(11): 1033-1036
Abstract:
Neutral nickel σ-acetylide complex [Ni(C≡CPh)2(PBu3)2] is a novel initiator for the polymerization of styrene in CHC13 over a range of polymerization temperature from 40℃ to 60℃. The polystyrene obtained was a syndio-rich atactic polymer and its weight-average molecular weight reached 279000. The mechanism of the polymerization was discussed and a radical mechanism was proposed.
Neutral nickel σ-acetylide complex [Ni(C≡CPh)2(PBu3)2] is a novel initiator for the polymerization of styrene in CHC13 over a range of polymerization temperature from 40℃ to 60℃. The polystyrene obtained was a syndio-rich atactic polymer and its weight-average molecular weight reached 279000. The mechanism of the polymerization was discussed and a radical mechanism was proposed.
2001, 12(11): 1037-1040
Abstract:
Carbon nanotube-polyaniline hybrid material was synthesized by emulsion polymerization in-situ. The morphology of hybrid material was studied by TEM and X-ray diffraction. The conductivity of nanocomposite increases with the increasing of carbon nanotube content because of the new conductivity passageways formed by carbon nanotubes.
Carbon nanotube-polyaniline hybrid material was synthesized by emulsion polymerization in-situ. The morphology of hybrid material was studied by TEM and X-ray diffraction. The conductivity of nanocomposite increases with the increasing of carbon nanotube content because of the new conductivity passageways formed by carbon nanotubes.
2001, 12(11): 1041-1042
Abstract:
In the polymerization process of methyl methacrylate (MMA), the Arrhenius parameters (activation energy and frequency factor) of propagating reaction monotonically decrease with increasing monomer conversion. At the beginning and middle stage of the propagating reaction, the increase of radical chain length is the main reason of above mentioned change. And at the end stage, the sharp decrease of kp indicates that the activation energy is approximately incline to zero and the propagating reaction is controlled by molecular diffusion motion.
In the polymerization process of methyl methacrylate (MMA), the Arrhenius parameters (activation energy and frequency factor) of propagating reaction monotonically decrease with increasing monomer conversion. At the beginning and middle stage of the propagating reaction, the increase of radical chain length is the main reason of above mentioned change. And at the end stage, the sharp decrease of kp indicates that the activation energy is approximately incline to zero and the propagating reaction is controlled by molecular diffusion motion.
2001, 12(11): 1043-1046
Abstract:
Oxygenation constants and thermodynamic parameters △H° and △S° of cobalt (Ⅱ) complexes with bis-(furaldehyde) Schiff bases (1, 2, 3, 4)were obtained by mearsuring saturated dioxygen uptake of these complexes in pyridine at different temperature. These complexes could activate molecular oxygen and were used as catalysts in cyclohexene oxidation. The influence of ligand structure on the dioxygen affinity and catalytic activity ofthe complexes were discussed.
Oxygenation constants and thermodynamic parameters △H° and △S° of cobalt (Ⅱ) complexes with bis-(furaldehyde) Schiff bases (1, 2, 3, 4)were obtained by mearsuring saturated dioxygen uptake of these complexes in pyridine at different temperature. These complexes could activate molecular oxygen and were used as catalysts in cyclohexene oxidation. The influence of ligand structure on the dioxygen affinity and catalytic activity ofthe complexes were discussed.
2001, 12(11): 1047-1050
Abstract:
KMgF3 doped with Eu was synthesized by mild hydrothermal method at 240℃ for the first time. The excitation and emission spectra of the KMgF3: Eu2+ phosphor were measured. Comparing with the sample synthesized through solid state reaction, the variation in the excitation spectra at 360 nm resulted from the existences of VK color centers; the low emission intensity was due to Eu2+ having transferred part energy to VK color centers.
KMgF3 doped with Eu was synthesized by mild hydrothermal method at 240℃ for the first time. The excitation and emission spectra of the KMgF3: Eu2+ phosphor were measured. Comparing with the sample synthesized through solid state reaction, the variation in the excitation spectra at 360 nm resulted from the existences of VK color centers; the low emission intensity was due to Eu2+ having transferred part energy to VK color centers.
