10.1021/acs.inorgchem.7b02817.s001 Ni-Ya Li Ni-Ya Li Dong Liu Dong Liu Zhi-Gang Ren Zhi-Gang Ren Christina Lollar Christina Lollar Jian-Ping Lang Jian-Ping Lang Hong-Cai Zhou Hong-Cai Zhou Controllable Fluorescence Switching of a Coordination Chain Based on the Photoinduced Single-Crystal-to-Single-Crystal Reversible Transformation of a <i>syn</i>-[2.2]Metacyclophane American Chemical Society 2018 Controllable Fluorescence Switching 254 nm UV light bpeb chemical transformation tpmcp SCSC conversion 4- fluorobenzoate 365 nm UV light Photoinduced Single-Crystal-to-Single-Crystal Reversible Transformation coordination chain exhibits photocontrollable fluorescence-switching behavior photodimerization reaction Coordination Chain FBA data storage devices syn 2018-01-02 13:36:31 Journal contribution https://acs.figshare.com/articles/journal_contribution/Controllable_Fluorescence_Switching_of_a_Coordination_Chain_Based_on_the_Photoinduced_Single-Crystal-to-Single-Crystal_Reversible_Transformation_of_a_i_syn_i_-_2_2_Metacyclophane/5747190 The observation of a reversible chemical transformation corresponding to an external stimulus in the solid state is intriguing in the exploration of smart materials, which can potentially be applied in molecular machines, molecular switches, sensors, and data storage devices. The solid-state photodimerization reaction of 1,3-bis­[2-(4-pyridyl)­ethenyl]­benzene (1,3-bpeb) in a one-dimensional coordination polymer {[Cd<sub>2</sub>(1,3-bpeb)<sub>2</sub>­(4-FBA)<sub>4</sub>]·H<sub>2</sub>O}<sub><i>n</i></sub> (4-FBA = 4-fluorobenzoate) with 365 nm UV light afforded <i>syn</i>-tetrakis­(4-pyridyl)-1,2,9,10-diethano­[2.2]­metacyclophane (<i>syn</i>-tpmcp) in quantitative yield via a single-crystal-to-single-crystal (SCSC) transformation. Upon irradiation with 254 nm UV light, an SCSC conversion from <i>syn</i>-tpmcp to 1,3-bpeb was also achieved in quantitative yield within the <i>syn</i>-tpmcp-supported coordination polymer {[Cd<sub>2</sub>(<i>syn</i>-tpmcp)­(4-FBA)<sub>4</sub>]·H<sub>2</sub>O}<i><sub>n</sub></i>. In particular, accompanied by the reversible transformation between 1,3-bpeb and <i>syn</i>-tpmcp, the coordination chain exhibits photocontrollable fluorescence-switching behavior, which makes this intelligent material an appealing candidate for practical applications.