Hettmanczyk, L., Spall, S.J.P., Klenk, S. et al. (4 more authors) (2017) Structural, Electrochemical, and Photochemical Properties of Mono- and Digold(I) Complexes Containing Mesoionic Carbenes. European Journal of Inorganic Chemistry, 2017 (14). pp. 2112-2121. ISSN 1434-1948
Abstract
Triazolylidenes are a prominent class of mesoionic carbenes (MICs) that are currently widely used in organometallic chemistry. Usually the metal complexes of such ligands are used as homogeneous catalysts even though they have vast potential in other branches of chemistry. We present here three related gold(I) complexes with MIC ligands: a neutral mononuclear chlorido complex [AuCl(MIC)], a cationic mononuclear complex containing two MIC ligands [Au(MIC)2]BF4, and a dicationic digold(I) complex containing two di-MIC ligands [Au2(κ1,κ1,µ-di-MIC)2](BF4)2. The complexes were characterized by 1H and 13C{1H} NMR spectroscopy, mass spectrometry, and single-crystal X-ray diffraction. The gold(I) centers are linearly coordinated through either one MIC-C and chlorido donors or through two MIC-C donors. The triazolylidenes display a delocalized bonding situation within the ring. Additionally, a short Au–Au distance of about 3 Å is observed for the digold(I) complex. All complexes display reduction steps in their cyclic voltammograms, and these are assigned to the reduction of the MIC ligands, as opposed to the generation of gold(0). The complexes emit at ca. 500 nm, with lifetimes of several microseconds in deoxygenated solutions; the emission intensity and lifetime are strongly decreased by the presence of oxygen, supporting the triplet origin of the emissive state. The present results display the utility of MIC ligands for generating electro- and photoactive molecules.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is the peer reviewed version of the following article: Hettmanczyk, L., Spall, S. J. P., Klenk, S., van der Meer, M., Hohloch, S., Weinstein, J. A. and Sarkar, B. (2017), Structural, Electrochemical, and Photochemical Properties of Mono- and Digold(I) Complexes Containing Mesoionic Carbenes. European Journal of Inorganic Chemistry, which has been published in final form at https://doi.org/10.1002/ejic.201700056. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. |
Keywords: | Gold; Triazolylidene; Electrochemistry; Carbenes; Emissions |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 09 Jun 2017 11:06 |
Last Modified: | 10 Apr 2018 00:39 |
Published Version: | https://doi.org/10.1002/ejic.201700056 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1002/ejic.201700056 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:117486 |