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Stimuli-Responsive Luminescent Properties of Dinuclear Cu(I) Complexes Regulated by Hydrogen-Bonding Donors
Hai-Jian Li1, Li-Ping Lin2, Jin-Wang Liu1
1Jiangxi Provincial Key Laboratory of Functional Crystalline Materials Chemistry, School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, People's Republic of China.
Abstract:
The selection of hydrogen-bonding donors is crucial for the development of stimuli-responsive luminescent materials that rely on weak hydrogen-bonding interactions. In this study, we report two novel dinuclear Cu(I) complexes, [Cu2(μ-η2(N,N),η2(N,N)-dpa)(μ-dppm)2](ClO4) (1) and [Cu2(μ-η2(N,N),η2(N,N)-dpa)(μ-dppa)2](ClO4)·2CH3COCH3 (2), which differ in their diphosphine linkers (CH2 in dppm vs NH in dppa). X-ray crystallography reveals weak CH···O hydrogen bonds between dppm-CH2 and perchlorate-O in 1 and weak NH···O interactions between dppa-NH and acetone-O in 2. The destruction of CH···OClO3- hydrogen bonds in 1, induced by grinding, triggers mechanochromic luminescence. In 2, the disruption of NH···OC(CH3)2 hydrogen bonds, caused by heating and grinding, leads to both thermochromic and mechanochromic luminescence. It is demonstrated that differences in donor-acceptor pairing (CH2/ClO4- vs NH/acetone) influence the nature and responsiveness of hydrogen-bonding interactions. Furthermore, these results offer new insights into the design and synthesis of low-cost, multistimuli-responsive luminescent materials through the modification of hydrogen-bonding donors.
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