Synthesis and structure of early transition metal NHC complexes†
Abstract
The synthesis and structure of several new early transition metal (Ti, Zr, Hf, and V) NHC complexes supported by one or two IMes N-2,6-iPr2-C6H3)Cl2(NHMe2)(IMes) (M = V (9), Zr (10)) are prepared from V(
NR)Cl2(NHMe2)2 or ZrCl2(NMe2)2(IMes) synthons. Ionic imido complexes [M(
N-2,6-iPr2-C6H3)Cl3(IMes)]−[HIMes]+ (M = V (12), Ti (13)) are obtained in modest yields from the treatment of [M(
NR)Cl2(NHMe2)2] with 2 equiv. of IMes. Treatment of a
O)Cl2(NHMe2)2 (13), which reacts with two equiv. of IMes to give the bis-NHC
O)Cl2(IMes)2 (14). All new compounds have been characterised by various spectroscopic techniques, elemental analyses, and magnetism studies for paramagnetic compounds. The solid-state structure of 12 of these complexes and of IMes·HCl have further been confirmed by
- This article is part of the themed collection: N-heterocyclic carbenes