Multistimuli-responsive multicolor solid-state luminescence tuned by NH-dependent switchable hydrogen bonds

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 53; no. 1; pp. 339 - 345
• Main Authors: Zhang, Rui, He, Li-Hua, Liu, Sui-Jun, Liao, Jin-Sheng, Wen, He-Rui, Chen, Jing-Lin, Zhao, Feng
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 19.12.2023
• Subjects: Functional groups; Hydrogen bonds; Luminescence; Solid state; Stimuli
• ISSN: 1477-9226; 1477-9234; 1477-9234
• DOI: 10.1039/d3dt03124a

Revealing the stimuli-responsive mechanism is the key to the accurate design of stimuli-responsive luminescent materials. We report herein the multistimuli-responsive multicolor solid-state luminescence of a new dicopper( i ) complex [{Cu(bpmtzH)} 2 (μ-dppa) 2 ](ClO 4 ) 2 ( 1 ), and the multistimuli-responsive mechanism is clarified by investigating its four different solvated compounds 1 ·2CH 3 COCH 3 ·2H 2 O, 1 ·2DMSO·2H 2 O, 1 ·4CH 3 OH, and 1 ·4CH 2 Cl 2 . It is shown that luminescence mechanochromism is associated with the breakage of the hydrogen bonds of bmptzH-NH with counter-ions such as ClO 4 − induced by grinding, while luminescence vapochromism is attributable to the breaking and forming of hydrogen bonds of dppa-NH with solvents, such as acetone, dimethylsulfoxide, and methanol, caused by heating and vapor fuming. In addition, those results might provide new insights into the design and synthesis of multistimuli-responsive multicolor luminescent materials by using various structure-sensitive functional groups, such as distinct N-H ones, to construct switchable hydrogen bonds. Stimuli-responsive multicolor solid-state luminescence is tuned by NH-dependent switchable hydrogen bonds, in which luminescence vapochromism and mechanochromism are associated with hydrogen bonding with dppa-NH and bpmtzH-NH, respectively.