Thermodynamic studies of the binding of bidentate nitrogen donors with methyltrioxorhenium(MTO)in CHCl_3 solution

摘要

Methyltrioxorhenium(MTO)adduct formation with bidentate nitrogen donors 2,2'-bipyridine(bpy),4,4'-dimethyl-2,2'-bipyridine(Me_2bpy),4,4'-di-tert-butyl-2,2'-bipyridine('Bu2bpy),1,10-phenanthroline(phen),5-methyl-l,10-phenanthroline(5-Mephen),5-chloro-1,10-phenanthroline(5-Clphen),4,7-dimethyl-1,10-phenanthroline(Me_2phen)has been studied at different temperatures in CHC1_3 solution.Spectrophotometeric measurements have been carried out to obtain the thermodynamic parameters.All complexes are enthalpy stabilized whereas the entropy changes counteract the adduct formation.The results are discussed in terms of different basicities of the bidentate N-donors.