Issue 24, 2017, Issue in Progress

Photoluminescence of self-assembled Ag(i) and Au(i) N-heterocyclic carbene complexes. Interplay the aurophilic, hydrogen bonding and hydrophobic interactions

Abstract

N-Hexadecanyl-N′-(2-hydroxyhexadecanyl)imidazol-2-ylidene (denoted as C16,C16(2-OH)-imy), in which one of the alkyl chains was anchored with a hydroxyl group at 2-position, was used to synthesize silver and gold N-heterocyclic carbene (NHC) complexes. The silver complex [(Ag(C16,C16(2-OH)-imy)2)2][Ag2Cl4] (1) shows liquid crystalline behavior and gold complexes [Au(C16,C16(2-OH)-imy)Cl] (2), [Au(C16,C16(2-OH)-imy)2][BF4] (3) and [Au(C16,C16(2-OH)-imy)2][PF6] (4) are soft materials. Compounds 1 and 2 are emissive, arising from metal–metal interactions. Compound 2 shows different emission colors depending on whether the sample is prepared as a crystal, soft material, or thin film. The relative strengths of aurophilic, hydrogen bonding and chain–chain hydrophobic interactions in the different states are investigated by powder X-ray diffraction, and Raman and IR spectroscopies. Results show that the one with a stronger Au–Au interaction displays a longer emission wavelength and has weaker O–H hydrogen bonding and hydrophobic interactions.

Graphical abstract: Photoluminescence of self-assembled Ag(i) and Au(i) N-heterocyclic carbene complexes. Interplay the aurophilic, hydrogen bonding and hydrophobic interactions

Supplementary files

Article information

Article type
Paper
Submitted
16 Dec 2016
Accepted
24 Feb 2017
First published
06 Mar 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 14611-14617

Photoluminescence of self-assembled Ag(I) and Au(I) N-heterocyclic carbene complexes. Interplay the aurophilic, hydrogen bonding and hydrophobic interactions

H. J. H. Syu, J. Y. Z. Chiou, J. Wang and I. J. B. Lin, RSC Adv., 2017, 7, 14611 DOI: 10.1039/C6RA28294F

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