We report the synthesis of a novel ligand L (3,6-di-tert-butyl-1,8-bis(dimesitylboryl)carbazolide) based on a carbazolyl scaffold bearing two sterically demanding boryl groups at the 1,8-positions. This diborylcarbazolyl framework effectively supports a range of transition metal complexes, including two-coordinate halide complexes LMIICl M = Fe (2), Co (3), and Zn (4), trinuclear complex (LCr)2(CrCl4) (5), and pseudo-one-coordinate complexes LMI M = Ni (6) and Cu (7). Coinage metal complexes derived from L exhibit a preference for two-coordinate geometries, as demonstrated by the isolation of LMPPh3 M = Ag (8) and Au (9) and LCu(DMAP) (10).
Lee et al. (Mon,) studied this question.