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Thermochemically Stable Liquid-Crystalline Gold(I) Complexes Showing Enhanced Room Temperature Phosphorescence

1
Department of Applied Chemistry, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Japan
2
Department of Chemistry, Indian Institute of Technology, Kandi, Sangareddy TS 502285, India
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(5), 227; https://doi.org/10.3390/cryst9050227
Received: 29 March 2019 / Revised: 25 April 2019 / Accepted: 26 April 2019 / Published: 27 April 2019
(This article belongs to the Special Issue Synthesis and Properties of Light-emitting Liquid Crystals)
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Abstract

Gold(I) complexes are some of the most attractive materials for generating aggregation-induced emission (AIE), enabling the realization of novel light-emitting applications such as chemo-sensors, bio-sensors, cell imaging, and organic light-emitting diodes (OLEDs). In this study, we propose a rational design of luminescent gold complexes to achieve both high thermochemical stability and intense room temperature phosphorescence, which are desirable features in practical luminescent applications. Here, a series of gold(I) complexes with ligands of N-heterocyclic carbene (NHC) derivatives and/or acetylide were synthesized. Detailed characterization revealed that the incorporation of NHC ligands could increase the molecular thermochemical stability, as the decomposition temperature was increased to ~300 °C. We demonstrate that incorporation of both NHC and acetylide ligands enables us to generate gold(I) complexes exhibiting both high thermochemical stability and high room-temperature phosphorescence quantum yield (>40%) under ambient conditions. Furthermore, we modified the length of alkoxy chains at ligands, and succeeded in synthesizing a liquid crystalline gold(I) complex while maintaining the relatively high thermochemical stability and quantum yield. View Full-Text
Keywords: aggregation-induced emission; room-temperature phosphorescence; gold(I) complex; N-heterocyclic carbene; acetylide; liquid crystal aggregation-induced emission; room-temperature phosphorescence; gold(I) complex; N-heterocyclic carbene; acetylide; liquid crystal
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Kuroda, Y.; Nakamura, S.-Y.; Srinivas, K.; Sathyanarayana, A.; Prabusankar, G.; Hisano, K.; Tsutsumi, O. Thermochemically Stable Liquid-Crystalline Gold(I) Complexes Showing Enhanced Room Temperature Phosphorescence. Crystals 2019, 9, 227.

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