Assembly-dependent thermochromic and photochromic luminescence in pentiptycene-based homoleptic gold(I) alkynyl clusters [(AuC≡CR)n]
Journal
Dalton Transactions
Journal Volume
54
Journal Issue
41
Start Page
15581
End Page
15587
ISSN
1477-9226
1477-9234
Date Issued
2025
Author(s)
Hsu, Ying-Feng
Cheng, Shih-Ying
Cheng, Che-An
Kang, Yu-Hsuan
Liu, Yi-Hung
Abstract
We report two stimuli-responsive luminescent assemblies based on homoleptic alkynyl gold(I) clusters, [(AuC≡CR)n], where R is a pentiptycene unit and n = 4 or 6. The green-emissive form (1Gs) adopts a vortex-like arrangement and exhibits photochromic luminescence, shifting from green to yellow to orange. In contrast, the yellow-emissive form (1Ys) adopts a less rigid structure, likely a radial arrangement, and displays thermochromic luminescence, transitioning from yellow to orange to red. These divergent behaviors arise from structural differences in η2-Au bonding, which modulate supramolecular geometry, pentiptycene–pentiptycene packing, and the strength of Au…Au interactions, thereby governing excited state aurophilicity. This work demonstrates the first luminochromic [(AuC≡CR)n] system and introduces a design strategy that leverages pentiptycene scaffolds to regulate excited-state aurophilicity for photo- and thermoresponsive luminescence.
SDGs
Publisher
Royal Society of Chemistry (RSC)
Type
journal article