RAMAN SPECTROSCOPIC STUDY ON THE CHAIN CONFORMATION OF ELECTROSYNTHESIZED POLY(ρ-PHENYLENE)FILMS

Poly(ρ-phenylene)(PPP)films have been electrochemically deposited on mirrorlike stainless steel(SS)electrode surfaces by direct oxidation of benzene in boron trifluoride diethyl etherate(BFEE)solutions at a constant applied potential of 1.7 V(versus Ag/AgCl).The chain conformations of as-grown PPP films have been studied by Raman spectroscopy.The results demonstrated that high synthesis temperature favors the formation of planar PPP,and the conformation of planar PPP can be changed into torsional PPP by cooling treatment.     

STUDIES ON THE RELATIONSHIP BETWEEN IR SPECTRA AND STRUCTURE OF SOME LINEAR Mo—Fe—S CLUSTERS.Ⅱ.LINEAR RELATIONSHIP BETWEEN SOME STRETCHING VIBRATION FREQUENCIES AND BOND DISTANCES

<正> The relationships between stretching vibration frequencies (v) and distances (r) of the bonds Mo-S and Fe-Cl in ten compounds have been investigated- It is found that vMO-S is linearly related to rMo-s. This provides a convenient method to obtained bond distance data for some cluster compounds whose molecular structures could not be determined by X-ray analyses, The linear relationship between vFe-cl and rFe-cl is also discussed. The near-linear relationships of vvs. rFe-Mo and vFe-sb vs. rFe-Mo demons-trate that the formation of Fe-Sb bond has an important influence on the formation of Fe-Mo bond and the Fe-Mo distance may be estimated from v values.     

STUDY ON THE SORPTION BEHAVIOR OF N—METHYL—2—THIO—IMIDAZOLE RESIN FOR Rh（Ⅲ）AND SEPARATION OF Rh（Ⅲ）WITH COMMON METAL IONS BY USING MTIR

The sorption behavior of N-methyl-2-thio-imidazole resin(MTIR) for Rh(Ⅲ） was investigated.The optmum sorption condition of MTIR for Rh(Ⅲ）,sorption rate t1/2=84min,sorption capacity 1.37mmol Rh(Ⅲ）/g MTIR,[140.5mg Rh(Ⅲ）/g MTIR],sorption molar ratio 0.34Rh(Ⅲ）/functional group,distribution coefficient D=2.5&#215;10^3mg&#183;g^-1 were determined.The sorption selectivity of MTIR for Rh(Ⅲ）in the presence of common metal ions,Fe^3+,Co^2+,Ni^2+ and Cu^2+ was examined.Rh(Ⅲ） adsorbed on MTIR can be eluted quantitatively by using a mixed solution composed of 20% thio-urea-acetone:6mol HCl.dm^-3(1:1vol.) used as an eluent.Rh(Ⅲ） can be separated from the mixture of Rh(Ⅲ） and Fe^3+,Co^2+,Ni^2+,Cu^2+ by using D72 resin and MTIR successively.