The triplet lifetime of some trichromophoric antenna rhodamine dyes have been measured by nanosecond laser flash photolysis and phosphorescence decay method．The intramolecular triplet energy transfer and intramolecular charge transfer in these dyes have been discussed． These processes may affect the lasing efficiency as well as the emission wavelength of the antenna dyes．The experimental results support the existence folded conformation in the antenna rhodamine dyes linked with CH_2-CH_2．

The polymerization of actin has been studied with applying a new method of microcalorimetric measurement in vitro. The thermodynamic parameters of actin poly merization at 310.15 K is reported. △H_m= 49.26 kJ·mol~(-1)， △G=-25.62 kJ·mol~(-1) and △S=241.54 J·K~(-1)×mol~(-1). Thermogram showed that the thermokinetic process of actin polymerization had two different thermal effects where in the first exothermic step is con sidered to be the total results of several reations: metal ion (Mg~(2+), K~+) binding to actin; the change of conformation of actin and hydrolysis of ATP in actin; and the second endothermic step is assigned to the results of association and length adjustment (annealing process). Cisplatin, at lower concentration, affects the polymerization of G-actin reflected in the decrease of ΔH_m; and at higher concentration it induces the crosslinking and depolymerization of F-actin in the equilibrium system of G/G. The experimental results manifest that when the concentration of cisplatin is increased to a certain value, the sign of ΔH_m will be changed from positive to negative i.e. the magnitude and sign of ΔH_m of actin polymerization is dependent on the concentration of cisplatin. This is possibly related to the pharmacologic or toxicological action of cisplatin.

A new technique of current transient response to a potential square-wave pulse was developed. Based on the technique, the disturbation of noise which is mixed with real signal can be effectively reduced by accumulation process in the current transient response, and the time constant of the electrochemical system can also be easily deter mined by plotting non-equidistance-differential-plot. Besides these, the amplitude of the potential pulse and the solution resistance of electrochemical system as well as their roles in improving "signal/noise" ratio of transient process were discussed, and Fe/(H_3BO_3+Na_2B_4O_7) and steel/sand clay corrosion systems measured to verify the new devel-oped method.

The formation heats of binary complex compounds formed from N-(para substituted phenyl) iminodiacetic acid (p-RPhIDA) with Ni(Ⅱ), Co(Ⅱ) and Zn(Ⅱ) have been determined by means of a model RD-1 conduction automatic calorimeter at 25.0±0.2 ℃ in the presence of KNO_3 (0.1 mol·L~(-1)). It was found that linear enthalpy relation ships not only did exist between the formation heats of the binary complex compounds (Ni(Ⅱ )-, Co(Ⅱ)-, Zn(Ⅱ)-p-RPhIDA) and the protonation heats of p-RPhIDA but the order of maghitude of these formation heats is in agreement with Irving-Willams order for the metal ions. The experimental fact of positive (endothermic) protonation heats of p-RPhIDA has been explained by means of polyring hydration structure of N-(para-substituted phenyl) iminodiacetate.

Infared Spectra of (N-methylaniline or diphenylamine + one of aprotic sol vents+CCL_4) have been measured at 298.15 K. The results show that stretching frequen cies v_(NH) of the associated complex A—H…B depend on the proton-accepting abilities of B, and the frequency shifts show a nearly linear dependence on electron donor num ber (DN) and also on nucleophilicity parameter (B~o). Equilibrium constants of some AB cross-associated complexes have been estimated from IR data. The equilibrium constant values show that diphenylamine as a proton donor is stronger than N-methylaniline. Morever, the related conclusions have been briefly discussed in terms of molecular structure and interactions between unlike molecules.

The pyrolysis reaction signals of isobutane at high temperature have been measured by the shock-tube laser-schlirene technique. The fall-offe of some essential uni molecular reactions occuring in the pyrolysis process have been calculated theoretically. A mechanism including fifty elementary reactions has been established and simulated by computer. Rate constant of the initial reaction i-C_4H_(10)→CH_3+i-C_3H_7 obtained at temperature of 1500—1800 K and pressure of 1.00 ×10~4-2.00×10~4 Pa was k_1=6.22×10~(11) exp (-457000/RT)±50%(s~(-1)). The result was well accordant with the theoretical fall-off calculation.

The character of Co(Ⅱ) Schiff base complex carrying O_2 was studied by INDO-UHF method. The results showed that the interaction between Co(Ⅱ) and O_2 was completed through σ bond, and the antiferro magnetic coupling was obvious. The ne cessity of fifth axial ligand in the reversible process of O_2 carring was discussed. The interaction between Co(Ⅱ) and N_2 was also studied in comparasion with Co-O_2. The cal culation showed that Co(Ⅱ) Schiff base have potential value for industrial application.

The crystal band structure and cluster's electronic structure of α-NaN_3, β-NaN_3 and AgN_3 have been investigated by using the EHCO and DV-X_α methods, re spectively. The results show that, comparing with NaN_3, AgN_3 has a smaller band gap (△E_g) and a larger band width (BW), and thus has conductivity higher than NaN3. Based on comparison of the energy levels and compositions as well as the electron transitions between frontier crystal orbitals (CO) and frontier molecular orbitals(MO) of AgN_3 with those of NaN_3, it can be predicted that AgN_3 would be more explosively sensitive than NaN_3, i.e. easier to decompose and detonate. The relationship between conductivity and sensitivity has also been elucidated from the view point of electronic levels.

The Mark-Houwink equation [η]=KW~α is used to determine the mass fractal dimensions of Ancelles. Here [η] being intrinsic viscosity, M beging molecular weight of micellar cluster. K, α, constants. The viscosity exponent α=(3/D-1), and the fractal dimension D may be obtained by ln[η]-InM plot, e.g. D=1.73 for Brij 35 in water and D=1.68, 1.62 for polyepichlorohydrin in tetrahydrofuran (THE) and cyclohexanone.
To determine with easy the fractal dimensions of micelles and macromolecules, a new approach, dubbed GPC-LALLS (gel permeation chromatography coupled with LALLS), has been work out by us, and the value of fractal dimension for polyepichloropydrin in THF obtained by GPC-LALLS is 1.667. The results indicate that the micellar clusters resemble the DLA. According to the Laplace fractal approach. The theoretical values of fractal dimensions of micellar clusters are obtained as D=1.54 (second order). D=1.67 (higer order) in agreement with computer simulation. In the same time. the multifractal spectrum f(α)-α of micelles are obtained and f_(max)(α)=1.75.
The multifractal thermodymics is employed to study the formation and transition of micelle. The partition function is defined as Z(β.L)=Σ_αC_αΣ_iP~β_(i,α) where C_α is the weight of configuration α. P_i, α is the growth probability of site i of configuration α, L is the system size, and β is the parameter measuring the heterogeneity of surfactant aggregation. Thereby two transition points, β_c=-4. β_c=1, for micelle aare found and set β_c=-4 corresponds the transition between surfactants and fractal micelles. and β_c=-1, the transition between fractal micelles and Euclidean structures (i.e. spherical, cylindrical, layer micelles etc.). These transitions correspond to the Brigg (5-5 nm). Porod (5-20 nm) and Guinier (20-100 nm).

NH_3-TPD and pyridine adsorption IR spectroscopy techniques have been used to study the zinc states in ZnHZSM-5 zeolite containing various zine content. The results indicate that, in addition to two desorption peaks for HZSM-5 zeolite located at about 533 and 733 K, two new peaks located at about 573 and 873 K were observed. These new peaks are believed to be associated with two kinds of zinc sites designated by L_1, L_2. The adsorbed ammonia amount of L_2 corresponds to the amount of L_(1616) acid characterized by pyridine adsorption IR spectra for ZnHZSM-5 zeolite with various zinc contents. It is possible that there are two kinds of zinc states in ZnHZSM-5 zeolite. One kind of them is ZnO species with weak acidity, the other is ZnOH~+ species with strong acidity which can promote the activity and has an effect on stability of activity for aromatization of propane.

In this paper, the electrouic structures of [MeBe(C≡CMe)NMe_3]_2 and [MeBeH·NMe_3]_2 were studied with the methods of DV-X_α SCC and natural bond or bitals(NBO), and then the covalences of Be in [MeBe(C≡CMe)NMe_3]_2, [Be(C≡CR)_2]_n, [MeBeH·NMe_3]_2 and (BeH_2)_n were discussed on the basis of the new definition of cova lence proposed by one of the authors. The results show that the covalences of Be in all these compounds are 6.

The semiconducting properties of the anodic plumbous oxide films formed on lead, lead-arsenic, lead-antimony and lead-bismuth alloys in 4.5 mol·L~(-1) H_2SO_4 (20 ℃) at 0.9 V (vs. Hg/Hg_2SO_4) for 2 h have been studied using a. c. impedance method. From the Mott-Schottky plots, the films are demonstrated to be n-type senilconductors. The flat-band potentials of the films on Pb, Pb-lat %As, Pb-lat %Sb and Pb-lat %Bi are -0.95, -1.1, -1.0 and -1.1 V(vs. Hg/Hg_2SO_4), respectively; while the corresponding donor densities are 0.82×10~(16), 2.6×10~(16), 1.2×10~(17) and 0.71×10~(16) cm~(-3).

A method for studying the effect of some organic compounds, that are neither soluble in water nor to be made into soluble salts in water on DNA has been investigated by a series of experiments. The solubility experiments have shown that dimethyl sulphoxide(DMSO) and its aqueous solutions are excellent solvents for the hydrophobic multicycles compounds with nitrogen atoms. The data of UV(298 K), CD(298 K), ~(31)P-NMR(323 K) spectra and molar enthalpy changes (298 K) for the effect of DMSO on DNA have not shown any effect of DMSO on DNA when the pH of solution is equal 7.0 and its concentration is less than 0.15 mol·L~(-1). The results of UV (298 K), CD(298 K) spectra and molar enthalpy changes (298 K) for the effect of eight multicycles compounds with nitrogen atoms on DNA in aqeous solution of DMSO have indicated that two of them have strong intercalation binding to DNA. Both the mechanism of interaction between the above compounds and DNA and the relationship between the behavior of intercalation binding of the compounds with same multicycles structures to DNA and their microstructures have been discussed.

The invar-type alloys of YFe_(12-x)V_x (x=1.6, 2.0, 2.4, 2.8, 3.2) and SmFe_(12-x)V_x (x=2.4, 2.8) were prepared by melting elements in water cooled crucibles in a small are furnace with a magnetic stirring appratus. The activity and the relative partial molar Gibbs free energy of the Yttrium and Samariam in the alloys were determined by the emf method using the single crystal of CaF2 as a solid electrolyte at temperatures of 920-1020 K and 900-1000 K, respectively. The galvanic cell used can be expressed as
Mo|RE, REF_3|CaF_2|REF_3, REF_(12-x)V_x|Mo
The overall cell reaction is RE(S)=RE(alloys). The relative partial molar free energy of RE in alloy is equal to the free energy change of the cell reaction, ΔG_(RE)=ΔG=-3FE. If pure solid phase RE is chosen as the standard state, then ΔG_(RE)=RT Ina_(RE), a_(RE)=exp(-3FE/RT).
The experimental result shows that the activity of Y in alloys are larger than that of Sm in alloys, the SmFe_(12-x) alloys are therefore more stable.

The enthalpies of solution of glycine in water and in aqueouse solutions containing LiCl, NaCl and KCl have been measured at 298.15 K. The enthalpic interac tion paramters h_(xy), h_(xxy) and h_(xyy) of glycine with the three salts have been evaluated.There are electrostatic and structural interaction between the electrolytes and glycine. The structural interaction includes the partial desolvation of the solutes and the effect of ions on the hydration structure of glycine. The enthalpic interaction parameters obtained show the dependence on the size of cations. An analysis for the enthalpic interaction parameters indicates that the structural interaction will be responsible for the dependence of the enthalpic interaction parameters on the size of cations.

Miniemulsions were prepared using mixed emulsifiers comprising of fatty alcohols ROH (C_5OH-C_(16)OH) and ionic or noinonic surfactants in low concentration.As a cosurfactant, fatty alcohol served as an aid for decreasing the interfacial tension and increasing the lifetime of oil drops at the oil-water interface. The mixed emulsi fier R(EO)_(12)-NP(EO)_2-ROH(R=C_5-C_8) could spontaneously form O/W miniemulsion in kerosene-water system.