# A Diborylcarbazolyl Ligand for Stabilizing Low-Coordinate and Low-Valent Metal Complexes

## TL;DR

Scientists created a new ligand that helps stabilize metal complexes with unusual structures and low coordination numbers.

## Contribution

A novel diborylcarbazolyl ligand was synthesized to support low-coordinate and low-valent metal complexes.

## Key findings

- The ligand stabilizes two-coordinate and pseudo-one-coordinate metal complexes.
- It forms trinuclear and coinage metal complexes with distinct geometries.
- The ligand supports a range of transition metals including Fe, Co, Zn, Ni, Cu, Ag, and Au.

## Abstract

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 LM

II

Cl [M = Fe (2), Co (3), and Zn (4)], trinuclear complex
(LCr)
2
(CrCl

4
) (5), and pseudo-one-coordinate
complexes LM

I
[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 LMPPh

3
[M
= Ag (8) and Au (9)] and LCu(DMAP) (10).