Rhodium(III), Palladium(II) and Rhenium(I) Complexes with 7‐(Diphenylphosphine)‐indole and ‐indolate

Abstract

AbstractWe present the synthesis of 7‐(diphenylphosphine)‐indole 1 (HPinol) as a novel mono‐ and bidentate P‐ and N, P‐ligand and its coordination chemical behaviour towards the d6‐ and d8‐transition metals rhodium(III), palladium(II) and rhenium(I). The reaction of 1 with [Cp*RhCl2]2 in a 1:2 molar ratio leads to the formation of the P‐coordinated complex [RhCl2(P–(HPinol))] (2). In the presence of the weak base NEt3, HCl elimination occurs by forming the neutral amido‐phosphine chelated complex [RhCl(N, P–(Pinol))] (3). The same P‐ and N, P‐coordination is observed for palladium(II), where two ligands 1 coordinate to the metal centre forming the neutral complexes [PdCl2(P–HPinol)2] (4) and [Pd(N, P–Pinol)2] (5). The reaction of Re(CO)5Br in the presence of NEt3 and PPh3 delivers the amido‐phosphine complex [Re(CO)3PPh3(N, P–Pinol)] (6). All products were characterised by multinuclear NMR spectroscopy, MS and IR spectra as well as elemental analysis. Furthermore, crystal structures of ligand 1 and all complexes 2–6 are presented.