The Role of Weak Interactions in the Mechano‐induced Single‐Crystal‐to‐Single‐Crystal Phase Transition of 8‐Hydroxyquinoline‐Based Co‐crystals |
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| Authors: | Jie Liu Dr Guangfeng Liu Prof Dr Yang Liu Xiaoxin Zheng Quanxiang Han Xin Ye Prof Dr Xutang Tao |
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| Affiliation: | State Key Laboratory of Crystal Materials, Shandong University, Jinan, P. R. China |
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| Abstract: | Mechano‐induced single‐crystal‐to‐single‐crystal (SCSC) phase transitions in crystalline materials that change their properties have received more and more attention. However, there are still too few examples to study molecular‐level mechanisms in the mechano‐induced SCSC phase transitions, making the systematic and in‐depth understanding very difficult. We report that bis‐(8‐hydroxyquinolinato) palladium(II)‐tetracyanoquinodimethane (PdQ2‐TCNQ) and bis‐(8‐hydroxyquinolinato) copper(II)‐tetracyanoquinodimethane (CuQ2‐TCNQ) show very different mechano‐response behaviors during the SCSC phase transition. Phase transition in CuQ2‐TCNQ can be triggered by pricking on the crystal surface, while in PdQ2‐TCNQ it can only be induced by applying pressure uniformly over the whole crystal face. The crystallography data and Hirshfeld surface analysis indicate that the weak intra‐layer C?H???O, C?H???N hydrogen bonds and inter‐layer stacking interactions determine the feasibility of the SCSC phase transition by mechanical stimuli. Weaker intra‐layer interactions and looser inter‐layer stacking make the SCSC phase transition occur much more easily in the CuQ2‐TCNQ. |
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| Keywords: | 8-hydroxyquinoline co-crystals mechano-response phase transition single-crystal-to-single-crystal |
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