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Two Zinc-Viologen Interpenetrating Frameworks with Straight and Offset Stacking Modes Respectively Showing Different Photo/Thermal Responsive Characters
journal contribution
posted on 2020-02-25, 20:34 authored by Jie Zhang, Yu Zeng, Haochao Lu, Xiaohan Chen, Xianzhi Yuan, Zhiyong FuTwo photo/thermal responsive donor–acceptor
molecular systems
have been designed and synthesized based on interpenetrating metal
organic frameworks (MOFs). For compound 1 [Zn(CPBPY)(HBTC)]·H2O, the formation of a 4-fold interpenetrating diamond structure
displays reversible photochromic behavior upon light/heat stimuli
with an offset π stacking figure for the donor carboxylate and
acceptor viologen units. By comparison, the 2-fold parallel interpenetrating
framework in compound 2 [Zn2(CPBPY)2(BTEC)]·2H2O·2CH3CH2OH
exhibits photo coloration and thermal coloration behaviors accompanying
long-lived charge separation upon light/heat stimuli with a face-to-face
π-stacking figure for the donor carboxylate and acceptor viologen
units. A faster response rate and stable charge separation status
are observed in the system of 2 due to its large π-conjugation
molecular system formed by the sandwich type π–π
stacking structure. This example of structure-controlled photoresponsive
systems shows a way to drive toward tuning functional system features
via the design of a molecular self-assembly approach.