Tools
Tools
Chambrier, Isabelle, Hughes, David, Jeans, Rebekah, Welch, Alan, Budzelaar, Peter and Bochmann, Manfred 
ORCID: https://orcid.org/0000-0001-7736-5428
(2020)
Do gold(III) complexes form hydrogen bonds? An exploration of AuIII dicarboranyl chemistry.
Chemistry - A European Journal, 26 (4).
pp. 939-947.
ISSN 0947-6539
Preview |
PDF (Carboranyl Acepted ms)
- Accepted Version
Available under License Unspecified licence. Download (1MB) | Preview |
Abstract
The reaction of 1,1′-Li2[(2,2′-C2B10H10)2] with the cyclometallated gold(III) complex (C^N)AuCl2 affords the first examples of gold(III) dicarboranyl complexes. The reactivity of these complexes is subject to the trans-influence exerted by the dicarboranyl ligand, which is substantially weaker than that of non-carboranyl anionic C-ligands. In line with this, displacement of coordinated pyridine by chloride is only possible under forcing conditions. While treatment of (C^N)Au{(2,2′-C2B10H10)2} (2) with triflic acid leads to Au-C rather than Au-N bond protonolysis, aqueous HBr cleaves the Au-N bond to give the pyridinium bromo complex 7. The trans-influence of a series of ligands including dicarboranyl and bis(dicarboranyl) was assessed by means of DFT calculations. The analysis demonstrated that it was not sufficient to rely exclusively on geometric descriptors (calculated or experimental) when attempting to rank ligands for their trans influence. Complex (C^N)Au(C2B10H11)2 containing two non-chelating dicarboranyl ligands was prepared similar to 2. Its reaction with trifluoroacetic acid also leads to Au-N cleavage to give trans-(Hpy^C)Au(OAcF)(C2B10H11)2 (8). In crystals of 8 the pyridinium N-H bond points towards the metal centre, while in 7 it is bent away. The possible contribution of gold(III) ··H-N hydrogen bonding in these complexes was investigated by DFT calculations. The results show that, unlike the situation for platinum(II), there is no evidence for an energetically significant contribution by hydrogen bonding in the case of gold(III).
| Item Type: | Article |
|---|---|
| Faculty \ School: | Faculty of Science > School of Chemistry |
| UEA Research Groups: | Faculty of Science > Research Groups > Chemistry of Light and Energy Faculty of Science > Research Groups > Chemistry of Materials and Catalysis |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 14 Nov 2019 09:30 |
| Last Modified: | 22 Oct 2022 05:27 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/72961 |
| DOI: | 10.1002/chem.201904790 |
Downloads
Downloads per month over past year
Actions (login required)
 |
View Item |