Synthesis and characterization of heteroleptic cyclometalated divalent osmium Os[P(C6H5)3]2(CO)(N∩C−)Cl complexes

Simple synthetic procedure, reaction of Os[P(C6H5)3]2(CO)2Cl2 with 2-phenylpyridine (or other similar N∩CH chelating ligands) in boiling 2-(2-ethoxyethoxy)ethanol solution leads to Os[P(C6H5)3]2(CO)(N∩C−)Cl complexes. Structures of the obtained species have been elucidated by means of 31P NMR and FT-IR techniques as well as elemental analysis data. The UV–vis absorption and emission properties of the newly synthesized complexes reveal the MLCT character of their lowest singlet and triplet excited states.