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在实验室EXAFS装置上测量了一种导电高聚物——H_2PtCl_6·6H_2O掺杂聚乙炔和模型化合物(K_2PtCl_6)的PtL_Ⅲ吸收谱。用高功率的施转阳极靶X射线发生器(RigakuRU-1000)作为X射线源。观测到的EXAFS数据分析表明,Pt原子在试样中有两种配位状态。一种是PtCl_6~(2-)离子,Pt—Cl键长为2.33A,另一种是Pt在2.28A附近有两个最近邻的Cl原子。实验结果提供了支持下述观点的直接结构信息:随着电子从(CH)_x链向铂盐的转移,发生下列反应:2H_2PtCl_6+2e~-→PtCl_6~(2-)+PtCl_2+4HCl
The PtL_Ⅲ absorption spectra of a conductive polymer - H_2PtCl_6 · 6H_2O doped polyacetylene and a model compound (K_2PtCl_6) were measured on a laboratory EXAFS device. A high-powered cast anode anode X-ray generator (Rigaku RU-1000) was used as the X-ray source. The observed EXAFS data analysis shows that Pt atoms have two coordination states in the sample. One is PtCl_6 ~ (2-) ion, the Pt-Cl bond length is 2.33A, the other is Pt near 2.28A with two nearest neighbor Cl atoms. The experimental results provide direct structural information that supports the following reactions as the electron is transferred from the (CH) _x chain to the platinum salt: 2H 2 PtCl 6 + 2e ~ - → PtCl 6 2- (2 +) PtCl 2 + 4HCl