(Benzimidazolin-2-ylidene)-AuI-Alkynyl Complexes: Syntheses, structure, and photophysical properties

Jai Anand Garg, Olivier Blacque, Jakob Heier, Koushik Venkatesan

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A series of N-heterocyclic carbene-based Au I-Ï-acetylide complexes of the type [(Bimz)Au-C⋯CR] (Bimz = benzimidazolin-2-ylidene; R = aryl, silyl groups) (1a-1l, 2, 3) were prepared from the precursor [(Bimz)Au ICl] by an in situ deprotonation of the terminal alkynes. Steady-state photoluminescence studies revealed that most of these complexes exhibit phosphorescence at room temperature and in 77 K rigidified matrices. Molecular structures were determined by single-crystal X-ray diffraction studies for complexes 1a, 1b, 1e, 1f, 1h, 1k, and 1l. Complexes 1f, 1h, and 1l revealed weak unsupported aurophilic interactions. Cyclic voltammetry studies exhibited irreversible behavior with one oxidation peak potential (E p,a) for most cases in the region 0.7-1.4 V. Experimental and DFT studies suggest that the nature of the emission is predominantly of intraligand character 3IL(π-π*) with a slight perturbation from the metal.

LanguageEnglish
Pages1750-1763
Number of pages14
JournalEuropean Journal of Inorganic Chemistry
Issue number11
DOIs
Publication statusPublished - Apr 2012
Externally publishedYes

Fingerprint

Phosphorescence
Deprotonation
Alkynes
Discrete Fourier transforms
Molecular structure
Cyclic voltammetry
Photoluminescence
Metals
Single crystals
X ray diffraction
Oxidation
Temperature
carbene

Keywords

  • Alkynes
  • Aurophilicity
  • Gold
  • Luminescence
  • N-Heterocyclic carbenes
  • Photophysics

Cite this

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title = "(Benzimidazolin-2-ylidene)-AuI-Alkynyl Complexes: Syntheses, structure, and photophysical properties",
abstract = "A series of N-heterocyclic carbene-based Au I-{\"I}-acetylide complexes of the type [(Bimz)Au-C⋯CR] (Bimz = benzimidazolin-2-ylidene; R = aryl, silyl groups) (1a-1l, 2, 3) were prepared from the precursor [(Bimz)Au ICl] by an in situ deprotonation of the terminal alkynes. Steady-state photoluminescence studies revealed that most of these complexes exhibit phosphorescence at room temperature and in 77 K rigidified matrices. Molecular structures were determined by single-crystal X-ray diffraction studies for complexes 1a, 1b, 1e, 1f, 1h, 1k, and 1l. Complexes 1f, 1h, and 1l revealed weak unsupported aurophilic interactions. Cyclic voltammetry studies exhibited irreversible behavior with one oxidation peak potential (E p,a) for most cases in the region 0.7-1.4 V. Experimental and DFT studies suggest that the nature of the emission is predominantly of intraligand character 3IL(π-π*) with a slight perturbation from the metal.",
keywords = "Alkynes, Aurophilicity, Gold, Luminescence, N-Heterocyclic carbenes, Photophysics",
author = "Garg, {Jai Anand} and Olivier Blacque and Jakob Heier and Koushik Venkatesan",
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(Benzimidazolin-2-ylidene)-AuI-Alkynyl Complexes : Syntheses, structure, and photophysical properties. / Garg, Jai Anand; Blacque, Olivier; Heier, Jakob; Venkatesan, Koushik.

In: European Journal of Inorganic Chemistry, No. 11, 04.2012, p. 1750-1763.

Research output: Contribution to journalArticleResearchpeer-review

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