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Science China Chemistry

, Volume 61, Issue 8, pp 957–965 | Cite as

Controlling the solid-state luminescence of gold(I) N-heterocyclic carbene complexes through changes in the structure of molecular aggregates

  • Arruri Sathyanarayana
  • Shin-ya Nakamura
  • Kyohei Hisano
  • Osamu Tsutsumi
  • Katam Srinivas
  • Ganesan Prabusankar
Articles
  • 89 Downloads

Abstract

Thermally stable, solid-state luminescent organic materials are highly desired for the development of practical applications. Herein we synthesized new gold(I) complexes with N-heterocyclic carbene ligands, which have the ability to form strong metal-organic bond. Consequently, their thermochemical stability is enhanced at temperatures around 300 °C. Precise design of the molecular structure of the ligands, with a focus on ensuring low steric hindrance around Au atoms in order to limit disturbances to Au/Au interactions, provided a complex with a densely packed crystal with a shorter intermolecular Au–Au distance (3.17 Å) than the typical distance. In the solid state, this complex exhibited strong aurophilic interactions, which generated intense phosphorescence even in air at room temperature (quantum yield=16%) in spite of absence of any phosphorescence in solution. This behavior is characteristic for solid-state luminescence referred to as aggregation-controlled emission. Furthermore, the gold (I) complex displays capacity for mechano- and vapo-chromism—that is, the ability to change color reversibly in response to the application of external stimuli. We believe that the proposed design framework, which involves controlling thermal stability and luminescence property separately, provides a new opportunity for the development of practical applications using solid-state luminescent organic molecules.

Keywords

Au complex N-heterocyclic carbene phosphorescence mechanochromism aggregation-induced emission 

Notes

Acknowledgements

This work was supported by the JSPS KAKENSHI (18K05265), JST Matching Planner Program (VP29117941122), JICA Collaboration Kick-starter Program (RU and IITH), and the Cooperative Research Program of the Network Joint Research Center for Materials and Devices (Tokyo Institute of Technology).

Supplementary material

11426_2018_9318_MOESM1_ESM.pdf (446 kb)
Controlling the Solid-State Luminescence of Gold(I) N-Heterocyclic Carbene Complexes through Changes in the Structure of Molecular Aggregates

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Arruri Sathyanarayana
    • 1
  • Shin-ya Nakamura
    • 1
  • Kyohei Hisano
    • 1
  • Osamu Tsutsumi
    • 1
  • Katam Srinivas
    • 2
  • Ganesan Prabusankar
    • 2
  1. 1.Department of Applied ChemistryRitsumeikan UniversityKusatsuJapan
  2. 2.Department of ChemistryIndian Institute of TechnologyKandi, SangareddyIndia

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