Premium
The Role of Weak Interactions in the Mechano‐induced Single‐Crystal‐to‐Single‐Crystal Phase Transition of 8‐Hydroxyquinoline‐Based Co‐crystals
Author(s) -
Liu Jie,
Liu Guangfeng,
Liu Yang,
Zheng Xiaoxin,
Han Quanxiang,
Ye Xin,
Tao Xutang
Publication year - 2016
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201600425
Subject(s) - stacking , phase transition , crystallography , crystal (programming language) , tetracyanoquinodimethane , materials science , single crystal , phase (matter) , hydrogen bond , layer (electronics) , chemical physics , chemistry , nanotechnology , condensed matter physics , molecule , organic chemistry , physics , computer science , programming language
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 (PdQ 2 ‐TCNQ) and bis‐(8‐hydroxyquinolinato) copper(II)‐tetracyanoquinodimethane (CuQ 2 ‐TCNQ) show very different mechano‐response behaviors during the SCSC phase transition. Phase transition in CuQ 2 ‐TCNQ can be triggered by pricking on the crystal surface, while in PdQ 2 ‐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 CuQ 2 ‐TCNQ.