Multiple ligand transfer reaction between [CpRu(L)(AN) 2][PF 6] (L=AN, CO, P(OMe) 3; AN=acetonitrile) and CpFe(CO)L′X (L′=CO, PMe 3, PMe 2Ph, PMePh 2, PPh 3, P(OPh) 3; X=Cl, Br, I)

Abstract

Treatment of ruthenium complexes [CpRu(AN) 3][PF 6] ( 1a) (AN=acetonitrile) with iron complexes CpFe(CO) 2X ( 2a– 2c) (X=Cl, Br, I) and CpFe(CO)L′X ( 6a– 6g) (L′=PMe 3, PMe 2Ph, PMePh 2, PPh 3, P(OPh) 3; X=Cl, Br, I) in refluxing CH 2Cl 2 for 3 h results in a triple ligand transfer reaction from iron to ruthenium to give stable ruthenium complexes CpRu(CO) 2X ( 3a– 3c) (X=Cl, Br, I) and CpRu(CO)L′X ( 7a– 7g) (L′=PMe 3, PMe 2Ph, PMePh 2, PPh 3, P(OPh) 3; X=Br, I), respectively. Similar reaction of [CpRu(L)(AN) 2][PF 6] ( 1b: L=CO, 1c: P(OMe) 3) causes double ligand transfer to yield complexes 3a– 3c and 7a– 7h. Halide on iron, CO on iron or ruthenium, and two acetonitrile ligands on ruthenium are essential for the present ligand transfer reaction. The dinuclear ruthenium complex 11a [CpRu(CO)(μ-I)] 2 was isolated from the reaction of 1a with 6a at 0°C. Complex 11a slowly decomposes in CH 2Cl 2 at room temperature to give 3a, and transforms into 7a by the reaction with PMe 3.