Interaction of Rh(I) with a new polydentate O4,N-donor pyrazolone able to form mononuclear, dinuclear and heterobimetallic compounds

Reaction of the new polydentate O4,N-donor ligand, namely 2,6-bis[4(1-N-phenyl-3-methyl-pyrazolium-5-one)carbonyl]pyridinium trichloride [H5QN]Cl3, with [Rh(COD)Cl]2 affords the dinuclear compound [Rh2(COD)2([H3QN]Cl3)] 1 which reacts with PPh3 forming [Rh(PPh3)2Cl2(HQN)] 2, able to interact with SnMe2Br2 yielding the heterobimetallic adduct [Rh(PPh3)2 Cl2(HQN)SnMe2Br2] 3; the X-ray structure of 2 shows the Rh(III) center in a slightly distorted octahedral environment with Cl atoms situated in cis-position and two phosphine groups in trans.