Chemistry of Ruthenium Polypyridine Complexes:IX.~1 Nitro-Nitrosyl Equilibrium in cis-[Ru(2,2'-bpy)_2(L)NO_2]~+ Complexes

摘要

Ruthenium(II) bisbipyridyl complexes cis-[Ru(bpy)_2(L)NO_2](BF_4) (bpy is 2,2'-bipyridyl) with 4-substituted pyridine ligands L=4-(Y)py (Y=NH_2,Me,Ph,and CN) were obtained.The equilibrium constants of the reversible nitro-nitrosyl transition [Ru(bpy)2(L)NO_2]~++2H~+<->[Ru(bpy)_2(L)NO]~(3+)+H_2O were measured in solutions with pH 1.5-8.5 (ionic strength 0.4).The constants correlate with the protonation constants of free ligands 4-(Y)py.