EPR INVESTIGATION OF THE 2ND SPHERE COORDINATION OF (CR(CN)5(NO))3- WITH PROTONATED POLYETHYLENEIMINE

被引:9
作者
CHANDRAMOULI, GVR [1 ]
SCHLAPFER, CW [1 ]
VONZELEWSKY, A [1 ]
机构
[1] UNIV FRIBOURG,INST INORGAN CHEM,CH-1700 FRIBOURG,SWITZERLAND
关键词
EPR SPECTROSCOPY; 2ND SPHERE COORDINATION; CR(CN)5(NO)]3-; PROTONATED POLYETHYLENEIMINE; EXCHANGE INTERACTION;
D O I
10.1002/mrc.1260291306
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The second sphere coordination of protonated, branched polyethleneimine (PEI) with [Cr(CN)5(NO)]3-(CPN) was studied by EPR spectroscopy. The interaction between the CPN complex ion and protonated PEI is reported as a function of pH. Simulation of the spectra indicated that ca. 98% of the CPN is bound to the polymer at pH almost-equal-to 7. The tumbling rate of this species was determined by simulation as 1/tau-c = 1 x 10(-8) s-1. The binding of CPN by PEI was influenced by the addition of other salts. Exchange interaction between Cu2+ and CPN was observed on the simultaneous binding of these two paramagnetic species to PEI. The pH dependence of the exchange was measured. At an intermediate pH range (7-9), CPN binds in the second and Cu2+ in the first sphere. The exchange interaction increases with the 'loading' of the polymer with the two paramagnetic species. Based on these results, a model is proposed for the species in solution.
引用
收藏
页码:S16 / S20
页数:5
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