Dinuclear gold(i) complexes: from bonding to applications

Abstract

The last two decades have seen a veritable explosion in the use of gold(i) complexes bearing N-heterocyclic carbene (NHC) and phosphine (PR3) ligands.

Synthesis and Coordination of a Bisphosphine-[NHC-borane] Compound: A Ligand Framework for Bimetallic Structure Featuring a Boron-Bridging Moiety

“…Very few [L n (μ-H)Au] 2 systems have been reported in the literature and bridging hydrides were not always directly observed. 74 While bridging hydrides were characterized between 0.42 and −1.95 ppm in [NHC(μ-H)Au] 2 complexes, 75,76 a broader range at a lower field between 2.83 ( 2 J P−H = 90.9 Hz) and 8.29 ( 2 J P−H = 49 Hz) was observed in the case of [(PR 3 ) n (μ-H)Au] 2 complexes (n = 1 or 2). 77−79 The 31 P chemical shift of (μ-Cl)Au 2 + species was calculated to be 78.9 ppm (Scheme 3).…”

Homogeneous Gold Catalysis for Regioselective Carbocyclization of Alkynyl Precursors

“…Understanding these concepts opened the doors to several stereo-, regio-and chemoselective reactions based on gold catalysis. [25][26][27][28][29][30][31][32][33][34][35][36] Moreover, bonding model of gold complexes [37][38][39] and organogold intermediates [40][41][42][43] have recently gained momentum in understanding the structure guided reactivity patterns. These revelations have indeed spurred the interests of organic/organometallic community to utilize gold catalysis as a synthetic tool in application-oriented areas like natural products [44][45][46][47][48][49][50] and πfunctional materials.…”

N-Heterocyclic Carbene Gold Complexes in a Photocatalytic CO2 Reduction Reaction

“…The photocatalytic conversion of CO 2 to reduced carbon states with visible light is a promising direction in renewable energy production. − The photocatalytic CO 2 reduction reaction (PCO 2 RR) is often driven with a photosensitizer (PS) and a transition-metal-based CO 2 reduction reaction (CO 2 RR) catalyst. , Molecular catalysts help to easily make precise structural modifications with atomistic-level control, which enables the rapid iterative design of CO 2 RR catalysts through understanding the structure–function relationship. Au-based N -heterocyclic carbene (NHC)-ligated molecular catalysts are underexplored in the PCO 2 RR despite these complexes being of interest for a large variety of transformations such as C–H activation, alkyne hydration, nitrile hydration, and alkene activation among others. − In general, NHC ligands are strong sigma donors with variable stereochemical and electronic features, capable of covalently bonding to a gold center to give, in many cases, more reactive catalysts with enhanced durability which are needed characteristics in the PCO 2 RR. , …”