Synthesis and structural study of platinum group metal complexes containing pyrimidine bridged pyrazolyl-pyridine ligand and η 5 and η 6 – cyclic hydrocarbons

Abstract

The mononuclear compounds [(η6-arene)Ru(bppm)Cl]PF6{bppm = 4,6-bis{3-(2-pyridyl)-1H-pyrazol-1-yl}pyrimidine; arene = C6 H 6, [1]; p- iPrC6 H 4Me, [2]; C6Me6, [3]}, [CpRu(bppm)(PPh3)]PF6{Cp = η5-C5 H 5, [4]; η5-C5Me5, [5]; η5-C9 H 7, [6]} and [Cp*M(bppm)Cl]PF6 {M = Rh [7]; Ir [8]} have been synthesized from the reaction of 4,6-bis{3-(2-pyridyl)-1H-pyrazol-1-yl}pyrimidine (bppm) and the corresponding precursor metal complexes [(η6-arene)Ru(μ-Cl)Cl]2, [CpRu(PPh3)2Cl] and [Cp*M(μ-Cl)Cl]2, respectively, in the presence of NH4 PF 6. They were characterized by the following techniques viz. IR, NMR, mass spectrometry and UV-visible spectroscopy. The molecular structures of [2] and [7] have been established by single crystal X-ray structure analyses. The reaction of [(η6-arene)Ru(μ-Cl)Cl]2, [CpRu(PPh3)2Cl] and [Cp*M(μ-Cl)Cl]2 {M = Rh, Ir} with the ligand bppm and NH4PF6 afforded only mononuclear complexes