Synthesis and structural characterization of dinuclear iridium hydrido complex with 3,6-bis(2-pyridyl)tetrazine, [Ir2(H)4(PPh3)4(bptz)](PF6)2 • 4CH2O2

Reaction of the precursor Ir complex [Ir(H)(2)(PPh3)(2)(Me2CO)(2)]PF6 with 3,6-bis(2-pyridyl)tetrazine (bptz) in CH2Cl2 gave a novel dinuclear Ir hydrido complex [Ir-2(H)(4)(PPh3)(4)(bptz)](PF6)(2) center dot 4CH(2)Cl(2). Crystallographic study described an interesting coordination environment having a pi-pi interaction and H-1 NMR study showed unique uptield shifts of pyridyl rings that are likely induced by the ring current effect of neighboring PPh3 ligands. (c) 2004 Elsevier B.V. All rights reserved.