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1989 Volume 6 Issue 4
1989, 6(4): 1-7
Abstract:
The extraction behavior of Co(Ⅱ) and Ni(Ⅱ) by a series of dialkylphosphoric acids,mono-esters of alkylphosphonic acids, and dialkylphosphinie acids was investigated. The polar and the steric effects of the substituents in extractant molecule on the extraction properties were studied by means of a correlation analysis method. The extractability of Ni is more dependent on the extractants' structure than that of Co, As the number of C-P bonds and the steric hindrance of the substituents increase, consequently, their separation ability increases, Ni extraction decreases more significantly than Co. This difference of Co and Ni in extraction is explained in terms of the steric configuration of their complexes formed during the extraction.
The extraction behavior of Co(Ⅱ) and Ni(Ⅱ) by a series of dialkylphosphoric acids,mono-esters of alkylphosphonic acids, and dialkylphosphinie acids was investigated. The polar and the steric effects of the substituents in extractant molecule on the extraction properties were studied by means of a correlation analysis method. The extractability of Ni is more dependent on the extractants' structure than that of Co, As the number of C-P bonds and the steric hindrance of the substituents increase, consequently, their separation ability increases, Ni extraction decreases more significantly than Co. This difference of Co and Ni in extraction is explained in terms of the steric configuration of their complexes formed during the extraction.
1989, 6(4): 8-12
Abstract:
The infrared and Raman spectra of the long chain mono-unsaturated fatty alcohol esters as insect sex pheromones of lepidoptera have been reported. The assignments of the vibrational frequencies of the compounds have been made. The spectral differences among total eleven compounds at room temperature (liquid state) and lower than freezing point (solid state)temperature have been investigated. The relationships between some characteristic bands and the chain structures of the compounds have been obtained. Combining with some physical constants, these relationships can be used to estimate the double bond position and chain length of the compounds.
The infrared and Raman spectra of the long chain mono-unsaturated fatty alcohol esters as insect sex pheromones of lepidoptera have been reported. The assignments of the vibrational frequencies of the compounds have been made. The spectral differences among total eleven compounds at room temperature (liquid state) and lower than freezing point (solid state)temperature have been investigated. The relationships between some characteristic bands and the chain structures of the compounds have been obtained. Combining with some physical constants, these relationships can be used to estimate the double bond position and chain length of the compounds.
1989, 6(4): 13-17
Abstract:
The extraction behavior of iron(Ⅲ), cobalt(Ⅱ) and nickel(Ⅱ) by 1,9-bis (1'-phenyl-3'-methyl-5'-oxopyrazole-4'-yl)-1, 9-nonanedione (abbreviated as H2 A) in chloroform rom sodium nitrate and HAc-NaAc buffer medium has been studied. Their pH1/2 values were found to be 2.43, 5.08 and 4.51,respectively. Therefore, it is possible to separate iron from cobalt and nickel by extraction with H2A. The compositions of the extracted complexes were determined by the slope method as Fe2A3; CoA and NiA respectively. Their extraction equlibrium constants (lgKex) were calculated to be 2.44±0.11, -7.33±0.18, -6.63±0.11 respectively. The solid ferric complex synthesised has been characterized by elemental,thermal analyses and IR measurement.
The extraction behavior of iron(Ⅲ), cobalt(Ⅱ) and nickel(Ⅱ) by 1,9-bis (1'-phenyl-3'-methyl-5'-oxopyrazole-4'-yl)-1, 9-nonanedione (abbreviated as H2 A) in chloroform rom sodium nitrate and HAc-NaAc buffer medium has been studied. Their pH1/2 values were found to be 2.43, 5.08 and 4.51,respectively. Therefore, it is possible to separate iron from cobalt and nickel by extraction with H2A. The compositions of the extracted complexes were determined by the slope method as Fe2A3; CoA and NiA respectively. Their extraction equlibrium constants (lgKex) were calculated to be 2.44±0.11, -7.33±0.18, -6.63±0.11 respectively. The solid ferric complex synthesised has been characterized by elemental,thermal analyses and IR measurement.
1989, 6(4): 18-21
Abstract:
The metathesis of propene has been carried out on the MoO3/SiO2 catalyst modified with rare earth oxides. In is found that most of the Ln2O3 can prolong the life of the catalysts and shorten the "break-in" period. Among them Tb4O7 and Pr611 exhibited a more marked effect. The stable duration of catalyst modified by Tb4O7 can be prolonged to approximately 1.6 times as long as that of the unmodified one. The "break-in" period was reduced to about 40% to 75%. From the results of the Tb4O7. MoO3/SiO2 catalyst, it can be concluded that the role of Tb4O7 is in facilitating the formation of the active surface site, i.e. the distorted square pyramidal Mo5+. The reaction of active sitc formation is in first order with respect to the precurser of the active species.
The metathesis of propene has been carried out on the MoO3/SiO2 catalyst modified with rare earth oxides. In is found that most of the Ln2O3 can prolong the life of the catalysts and shorten the "break-in" period. Among them Tb4O7 and Pr611 exhibited a more marked effect. The stable duration of catalyst modified by Tb4O7 can be prolonged to approximately 1.6 times as long as that of the unmodified one. The "break-in" period was reduced to about 40% to 75%. From the results of the Tb4O7. MoO3/SiO2 catalyst, it can be concluded that the role of Tb4O7 is in facilitating the formation of the active surface site, i.e. the distorted square pyramidal Mo5+. The reaction of active sitc formation is in first order with respect to the precurser of the active species.
1989, 6(4): 22-25
Abstract:
The Goffinet's method for resolution of (±)-trans-chrysanthemic acid and the Campbell's method for resolution of (±)-cis-chrysanthemic acid have been improved. The(+)-cis acid and the (-)-cis acid were resolved only by using quinine alone. Four esters were obtained by esterifacation.The results showed: (1)The biological activity of Methoxythrin is in relation of the configuration of chrysanthemic acid and the ester of (-)-(1R,3R)-trans acid showed the highest activity. (2)The biological activity of the compounds varies from insect to insect tested.
The Goffinet's method for resolution of (±)-trans-chrysanthemic acid and the Campbell's method for resolution of (±)-cis-chrysanthemic acid have been improved. The(+)-cis acid and the (-)-cis acid were resolved only by using quinine alone. Four esters were obtained by esterifacation.The results showed: (1)The biological activity of Methoxythrin is in relation of the configuration of chrysanthemic acid and the ester of (-)-(1R,3R)-trans acid showed the highest activity. (2)The biological activity of the compounds varies from insect to insect tested.
1989, 6(4): 26-31
Abstract:
IR and NMR spectra of some 2-aryl-thiazolidine-4-carboxyli acids and MS spectra of two of them have been recorded. As indicated by IR, the 2-aryl-thiazolidine-4-carboxylic acids in solid state mainly exist in the zwitterion form. These compounds are rather stable and a considerable similarity among them in cleavage were found in MS spectra. The NMR spectra revealed the existence of diasteroisomers for these compounds and the influence of the substituents on the electron density of the carbon atoms of the benzere ring is much greater than on that of the thiazolidine ring.
IR and NMR spectra of some 2-aryl-thiazolidine-4-carboxyli acids and MS spectra of two of them have been recorded. As indicated by IR, the 2-aryl-thiazolidine-4-carboxylic acids in solid state mainly exist in the zwitterion form. These compounds are rather stable and a considerable similarity among them in cleavage were found in MS spectra. The NMR spectra revealed the existence of diasteroisomers for these compounds and the influence of the substituents on the electron density of the carbon atoms of the benzere ring is much greater than on that of the thiazolidine ring.
1989, 6(4): 32-37
Abstract:
The mass spectra of a new type of organophosphorus compounds O-ethyl-N-isopropylphos-phoro (thioureido) thioates have been studied using low and high resolution EIMS and B/E, B2/E linked scanning Lechniques. Attention was focused on P-N bond cleavage, which involves simple fragmentations and rearrangement as well as loss of HS·, H2S. The effects of substituents R"of thioureido on above reactions have been discussed as well.
The mass spectra of a new type of organophosphorus compounds O-ethyl-N-isopropylphos-phoro (thioureido) thioates have been studied using low and high resolution EIMS and B/E, B2/E linked scanning Lechniques. Attention was focused on P-N bond cleavage, which involves simple fragmentations and rearrangement as well as loss of HS·, H2S. The effects of substituents R"of thioureido on above reactions have been discussed as well.
1989, 6(4): 38-45
Abstract:
26 azole compounds were synthesized,among them 22 compounds are firstly reported. The structures of the compotunds were confirmed by1H NMR,IR and elemental analysis.Most of the compounds gave positive results in the preliminary biological evaluation. A brief discussion on the relationship between the structure and bioactivity of the compounds is given.
26 azole compounds were synthesized,among them 22 compounds are firstly reported. The structures of the compotunds were confirmed by1H NMR,IR and elemental analysis.Most of the compounds gave positive results in the preliminary biological evaluation. A brief discussion on the relationship between the structure and bioactivity of the compounds is given.
1989, 6(4): 46-49
Abstract:
Polymer-bound α-carbanion of β-ketosulfone (2) was prepared by exchange reaction of strongly basic anion resin D296 (OH- form) with α-pheny'sulfonyl acetophenone (1).Several alkylated products of 2 were synthesized under anhydrous condition by polymer-supported carbanion with alkyl halides in good yields. The hydrolysis of the ester group in the alkylating agent could be avoided in this process.
Polymer-bound α-carbanion of β-ketosulfone (2) was prepared by exchange reaction of strongly basic anion resin D296 (OH- form) with α-pheny'sulfonyl acetophenone (1).Several alkylated products of 2 were synthesized under anhydrous condition by polymer-supported carbanion with alkyl halides in good yields. The hydrolysis of the ester group in the alkylating agent could be avoided in this process.
1989, 6(4): 50-53
Abstract:
In this paper the synthesis of 5α-cholestane 4 and 5β-cholestane 7 from cholesterol by means of stereospecific reaction is reported. Cholesterol 1 was first converted into 5α-dihydrocholesterol 2 by stercoselective catalytic hydrogenation, then into 5α-cholestane 4 by successive oxidation with PDC and Clemmensen reduction. 5β-Cholestane 7 was synthesized by Oppenauer oxidation of chole-sterol to 4-cholesten-3-one 5, following by stereoselective catalytic hydrogenation and Clemmensen reduction. In above reactions the stereoselective catalytic hydrogenation was a key step. The structure and configuration of the intermediates and target molecules were confirmed by their GC, MS, ORD and CD data.
In this paper the synthesis of 5α-cholestane 4 and 5β-cholestane 7 from cholesterol by means of stereospecific reaction is reported. Cholesterol 1 was first converted into 5α-dihydrocholesterol 2 by stercoselective catalytic hydrogenation, then into 5α-cholestane 4 by successive oxidation with PDC and Clemmensen reduction. 5β-Cholestane 7 was synthesized by Oppenauer oxidation of chole-sterol to 4-cholesten-3-one 5, following by stereoselective catalytic hydrogenation and Clemmensen reduction. In above reactions the stereoselective catalytic hydrogenation was a key step. The structure and configuration of the intermediates and target molecules were confirmed by their GC, MS, ORD and CD data.
1989, 6(4): 54-58
Abstract:
The synthesis and crystal structure of N,N N',N'-tetracyclohexyl-oxapentane diamide are reported in this paper. The compound erystallizes in monoclinic space group C2/c with a=29.023(2),b=9.964(6), c=26.714(1)Å, β=132.26(3)°and Z=8. The molecule has C2 symmetry and the symmetric axis goes through the oxygen atom of the ether group.
The synthesis and crystal structure of N,N N',N'-tetracyclohexyl-oxapentane diamide are reported in this paper. The compound erystallizes in monoclinic space group C2/c with a=29.023(2),b=9.964(6), c=26.714(1)Å, β=132.26(3)°and Z=8. The molecule has C2 symmetry and the symmetric axis goes through the oxygen atom of the ether group.
1989, 6(4): 59-61
Abstract:
The solubillty constants K°R of some five-membered heterocycles i.e. furan, thiophene and pyrrole, the apparent equilibrium constants KR and the stability constants K1 of these Lewis bases with Lewis acid Ni [CF3COCHC(C4H4S)=NCH2]2 in squalane solution are determined by GLC method. The thermodynamic parameters are calculated with the relation -RlnK1~1/T. The results of the experiments have been analysed.
The solubillty constants K°R of some five-membered heterocycles i.e. furan, thiophene and pyrrole, the apparent equilibrium constants KR and the stability constants K1 of these Lewis bases with Lewis acid Ni [CF3COCHC(C4H4S)=NCH2]2 in squalane solution are determined by GLC method. The thermodynamic parameters are calculated with the relation -RlnK1~1/T. The results of the experiments have been analysed.
1989, 6(4): 62-64
Abstract:
It is believed that it is difficult to synthesize cyclopentadienyl light RE chloride from tri-cyclopentadienide compounds of RE because of disproportionation reaction which is related to lanthanide contraction and coordination unsaturation. In this work, the dinuclear organic compounds of RE-lithium were synthesized using THF solution of LnCl3·nLiCl.The disproportionation reaction is considered to be avoided by the stable effect of chloro-bridge link. Mono-cyclopentadienyl light RE chlorides were synthesized from tri-cyclopentadienide compounds of RE successfully.
It is believed that it is difficult to synthesize cyclopentadienyl light RE chloride from tri-cyclopentadienide compounds of RE because of disproportionation reaction which is related to lanthanide contraction and coordination unsaturation. In this work, the dinuclear organic compounds of RE-lithium were synthesized using THF solution of LnCl3·nLiCl.The disproportionation reaction is considered to be avoided by the stable effect of chloro-bridge link. Mono-cyclopentadienyl light RE chlorides were synthesized from tri-cyclopentadienide compounds of RE successfully.
1989, 6(4): 65-68
Abstract:
In this paper the synthesis of the complexes of V(Ⅴ), Mo(Ⅵ) and W(Ⅵ) with quercetin (H5Q·2H2O) Were reported. The IR, UV, 13C-NMR and thermogramm of the complexes were reccrded. The complexes of 2:1 composition were considered to be formed under used conditions.
In this paper the synthesis of the complexes of V(Ⅴ), Mo(Ⅵ) and W(Ⅵ) with quercetin (H5Q·2H2O) Were reported. The IR, UV, 13C-NMR and thermogramm of the complexes were reccrded. The complexes of 2:1 composition were considered to be formed under used conditions.
1989, 6(4): 69-71
Abstract:
Optically active thiazole amino acid (L-Ile) was synthesized by the route described in the paper.
Optically active thiazole amino acid (L-Ile) was synthesized by the route described in the paper.
1989, 6(4): 72-74
Abstract:
The ion transfer of the muscle relaxing agent gallamine triethiodide across tbe water/nitrobenzene interface was studied by cyclic voltammetry and chronopotentiometry with linear current scanning. The calculated standard interfacial potential difference, Gibbs free energy, and partition coefficient of gallamine triethiodide in two phases were△owφ0=0.22V, △owGo=-8.1kJ and kp=0.65, respectively. The linear relationship between peak current and concentration of gallamine triethiodide could be used for medicinal analysis.
The ion transfer of the muscle relaxing agent gallamine triethiodide across tbe water/nitrobenzene interface was studied by cyclic voltammetry and chronopotentiometry with linear current scanning. The calculated standard interfacial potential difference, Gibbs free energy, and partition coefficient of gallamine triethiodide in two phases were△owφ0=0.22V, △owGo=-8.1kJ and kp=0.65, respectively. The linear relationship between peak current and concentration of gallamine triethiodide could be used for medicinal analysis.
1989, 6(4): 75-77
Abstract:
The extraction of lanthanide ions(La3+, Nd3+, Dy3+, Yb3+) from nitlie acid solution with mixturc of 1-thenyl-3-methyl-4-dichloroacetyl-pyrazolone-5(PMDCP) and tri-n-(octy-lphosphine oxide (TOPO) hae been studied. The synergic extraction coefficent of lanthanum 27.3. The composition of extracted compound of lanthanum was shown to be a(PMDCP)3·(TOPO)2. The pH values of half an, extraction rate at 25℃ of La3+, Nd3+, Dy3+ and Yb3+are 2.11, 1.77, 1.60 and 1.50 respectively. The extraction equilibrium constants, enthalpy change and entropy change of the reaction at 25℃ have also been calculated.
The extraction of lanthanide ions(La3+, Nd3+, Dy3+, Yb3+) from nitlie acid solution with mixturc of 1-thenyl-3-methyl-4-dichloroacetyl-pyrazolone-5(PMDCP) and tri-n-(octy-lphosphine oxide (TOPO) hae been studied. The synergic extraction coefficent of lanthanum 27.3. The composition of extracted compound of lanthanum was shown to be a(PMDCP)3·(TOPO)2. The pH values of half an, extraction rate at 25℃ of La3+, Nd3+, Dy3+ and Yb3+are 2.11, 1.77, 1.60 and 1.50 respectively. The extraction equilibrium constants, enthalpy change and entropy change of the reaction at 25℃ have also been calculated.
1989, 6(4): 78-80
Abstract:
Bromide complexes of Au(Ⅲ), Bi(Ⅲ) and Cd(Ⅱ) ions form associates with rhodamine B.The associated substances can be separated by floatation and determined for Au, Bi and Cd by air-acetylene flame atomic absorption-spectrophotometry. The optimum conditions for the determination are described. The floating recovery ratio is greater than 90%. By this method, it is possible to determine trace amount of Au, Bi and Cd in sea water, pure zinc plates and minerals. Co2+, Ni2+, Ca2+, Al+3,Fe3+, Mg2+, Mn2+, Cr3+,K+ and Zn2+ etc. do not interfere the determination. The detection Iimit was found to be 25ng/mL for Au,60ng/mL (for Bi) and Cd 4.5ng mL (for Cd) respectively.
Bromide complexes of Au(Ⅲ), Bi(Ⅲ) and Cd(Ⅱ) ions form associates with rhodamine B.The associated substances can be separated by floatation and determined for Au, Bi and Cd by air-acetylene flame atomic absorption-spectrophotometry. The optimum conditions for the determination are described. The floating recovery ratio is greater than 90%. By this method, it is possible to determine trace amount of Au, Bi and Cd in sea water, pure zinc plates and minerals. Co2+, Ni2+, Ca2+, Al+3,Fe3+, Mg2+, Mn2+, Cr3+,K+ and Zn2+ etc. do not interfere the determination. The detection Iimit was found to be 25ng/mL for Au,60ng/mL (for Bi) and Cd 4.5ng mL (for Cd) respectively.
1989, 6(4): 81-83
Abstract:
Palladium catalysts supported on silica gel were prepared. The catalytic behaviour of the catalysts in the hydrogenation of methyl acrylate was investigated. Several factors influencing the activity of the catatysts were examined. The results showed that the catalysts possess a high catalytic bydrogenation activity and good reusability.
Palladium catalysts supported on silica gel were prepared. The catalytic behaviour of the catalysts in the hydrogenation of methyl acrylate was investigated. Several factors influencing the activity of the catatysts were examined. The results showed that the catalysts possess a high catalytic bydrogenation activity and good reusability.
1989, 6(4): 84-86
Abstract:
A simnltaneous spectrophoto metric method for Sb and As determination has been established. SbH3 and AsH3, produced by addition of a KBH4 tablet to Sb3+ and As3+ in tartaric solution,were absorbed by a 95% alcohol solution of Fe3+-1,10 phenathroline and a mixed solution of AgNO3, PVA and alcohol. The absorbances were measured at 400nm for As and 510nm for Sb. Tolerance levels of various ions were given. The detection limits were 0.09ppm (3 s) for Sb and 0.05ppm (3 s) for As. The method is simple, rapid, and sensitive.
A simnltaneous spectrophoto metric method for Sb and As determination has been established. SbH3 and AsH3, produced by addition of a KBH4 tablet to Sb3+ and As3+ in tartaric solution,were absorbed by a 95% alcohol solution of Fe3+-1,10 phenathroline and a mixed solution of AgNO3, PVA and alcohol. The absorbances were measured at 400nm for As and 510nm for Sb. Tolerance levels of various ions were given. The detection limits were 0.09ppm (3 s) for Sb and 0.05ppm (3 s) for As. The method is simple, rapid, and sensitive.
1989, 6(4): 87-90
Abstract:
Catalyst carrier TiO2-Al2O3 was prepared through impregnating γ-Al2O3 with TiCl4-CCl4 (or TiCl4-CH3COCH3) solution, followed by calcination at 550℃ for 24 hrs.The series samples of TiO2-Al2O3 with different TiO2 loading have been characterized by XRD,XPS, TEM and HEED techniques. The maximum dispersion capacities for TiO2 on γ-Al2O3 were found by XRD and XPS to be 0.12g TiO2/g γ-Al2O3 and 0.11g TiO2/g γ-Al2O3 respectively.It was also verified by, TEM and HEED techniques. The values indicate that TiO2 is dispersed on the surface of γ-Al2O3 as a submonolayer and the monolayer coverage for TiO2 on γ-Al2O3 was 60% as compared by a close packed monolayer model.
Catalyst carrier TiO2-Al2O3 was prepared through impregnating γ-Al2O3 with TiCl4-CCl4 (or TiCl4-CH3COCH3) solution, followed by calcination at 550℃ for 24 hrs.The series samples of TiO2-Al2O3 with different TiO2 loading have been characterized by XRD,XPS, TEM and HEED techniques. The maximum dispersion capacities for TiO2 on γ-Al2O3 were found by XRD and XPS to be 0.12g TiO2/g γ-Al2O3 and 0.11g TiO2/g γ-Al2O3 respectively.It was also verified by, TEM and HEED techniques. The values indicate that TiO2 is dispersed on the surface of γ-Al2O3 as a submonolayer and the monolayer coverage for TiO2 on γ-Al2O3 was 60% as compared by a close packed monolayer model.
1989, 6(4): 91-92
Abstract:
The synthetic method of tribenzyltin chloride has been modified, using DMF as a solvent by reacting tin powder with benzyl chloride and adding magnesium powder to the reactant after disappearing of tin powder. The yield of tirbenzyltin chloride is up to 91%.Compounds of tribenzyltin chloride with isoo tyl thioglycollate, lauric acid and stearic acid have been prepared firstly, they may be used as a PVC stabilizer.
The synthetic method of tribenzyltin chloride has been modified, using DMF as a solvent by reacting tin powder with benzyl chloride and adding magnesium powder to the reactant after disappearing of tin powder. The yield of tirbenzyltin chloride is up to 91%.Compounds of tribenzyltin chloride with isoo tyl thioglycollate, lauric acid and stearic acid have been prepared firstly, they may be used as a PVC stabilizer.
1989, 6(4): 93-95
Abstract:
A series of highly crosslinked styrene-divinylbenzene copolymers (DVB>60%) were prepared. The pore structure of the copolymers was found to be changed with the DVB content, the amount and ratio of diluents used in rolymerization. Pretreatment of the copolymer showed a considerable influence on the porosity
A series of highly crosslinked styrene-divinylbenzene copolymers (DVB>60%) were prepared. The pore structure of the copolymers was found to be changed with the DVB content, the amount and ratio of diluents used in rolymerization. Pretreatment of the copolymer showed a considerable influence on the porosity
1989, 6(4): 96-98
Abstract:
The decomposition of blocky or powdered crystals of YAP in vacuum or under Ar atmosphere at 1650-1700℃ in graphite resistance furnace has been studied by chemical analysis, X-ray diffraction and SEM observation. The YAP crystal was unstable in above mentioned conditions owing to the reducing atmosphere produced by graphite. Al was lost by volatilization, forming aluminium bead in the cool region of the graphite crucible tray, and YAM (and Y203) remained. A lot of holes were observed on the surface of YA type crystals. It is supposed that decomposition takes place at these active sites In the similar condition YAG crystal is also unsatble as YAP. The "sweating" phenomena, may be caused just by the unstability of YAP.
The decomposition of blocky or powdered crystals of YAP in vacuum or under Ar atmosphere at 1650-1700℃ in graphite resistance furnace has been studied by chemical analysis, X-ray diffraction and SEM observation. The YAP crystal was unstable in above mentioned conditions owing to the reducing atmosphere produced by graphite. Al was lost by volatilization, forming aluminium bead in the cool region of the graphite crucible tray, and YAM (and Y203) remained. A lot of holes were observed on the surface of YA type crystals. It is supposed that decomposition takes place at these active sites In the similar condition YAG crystal is also unsatble as YAP. The "sweating" phenomena, may be caused just by the unstability of YAP.
1989, 6(4): 99-103
Abstract:
The title complex was synthesized and characterized by elemental analysis and FT-IR spectrometry. The crystal of the complex, determined by X-ray diffraction method, belongs to monoclinic with space group C2/c and cell parameters a=19.358(8)Å, b=11.841(4)Å,c=21.272(8)Å, β=100.55(3) andZ=4.Dimethyl phosphates coordinate with lanthanums forming a special structure of alternate two-four O-P-O bridges. Trimethyl phosphates are arranged on tho two sides of the eight-membered rings of the double bridges.
The title complex was synthesized and characterized by elemental analysis and FT-IR spectrometry. The crystal of the complex, determined by X-ray diffraction method, belongs to monoclinic with space group C2/c and cell parameters a=19.358(8)Å, b=11.841(4)Å,c=21.272(8)Å, β=100.55(3) andZ=4.Dimethyl phosphates coordinate with lanthanums forming a special structure of alternate two-four O-P-O bridges. Trimethyl phosphates are arranged on tho two sides of the eight-membered rings of the double bridges.
