Chemistry of ruthenium polypyridien complexes:V.Electronic structure of Ruthenium(II) bipyridine-diphosphine mixed-ligand complexes

摘要

Comparative analysis of the donor-acceptor capacities of diphosphine ligands in two series of complexes:cis(Ru(bpy)_2(LL)]~q (LL=2,2'-bipyridine9bpy),o-benzoquinonediimine (bqdi),cis-1,2-bis(diphenylphosphino)ethane,cis-1,2-bis(diphenylphosphino)ethylene (dppen),(NH-3)_2,and (CO)_2] and [Ru(NH_3)_4centre dot (LL)]~(2+) (LL=bpy,dppen,and bqdi0,was performed.Diphosphines are the strongest #delta# donors;they compare in #pi#-acceptor capacity which is associated with phosphorus d orbitals with 2,2'-bipyridine and fall far short of o-benzoquinonediimine and carbonyl.