Oriented Single-Crystal-to-Single-Crystal Phase Transition with Dramatic Changes in the Dimensions of Crystals

Abstract

We report here a new polymorph of cocrystal CuQ2-TCNQ that shows an oriented single-crystal-to-single-crystal phase transition along its a-axis at ambient conditions. Upon mechanical stimulation, it converts into another polymorph accompanied by almost doubling its length and halving its thickness. Our crystallographic studies indicate the dramatic changes in crystal dimensions resulted from the prominent changes of molecular stacking patterns. A reasonable mechanism for the phenomenon was proposed on the basis of the structural, microscopic, and thermal analysis.

Self‐Healing Behavior in a Thermo‐Mechanically Responsive Cocrystal during a Reversible Phase Transition

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The molecular-level motions of ac oronene-based supramolecular rotator are amplified into macroscopic changes of crystals by co-assembly of coronene and TCNB (1,2,4,5-tetracyanobenzene) into ac harge-transfer complex. [5][6][7][8][9][10][11] [ + + ]T hese authors contributed equally to this work.Supportinginformation for this article can be found under: http://dx.

The crystallographic studies show that the global similarity of the packing patterns of both phases with local differences,s uch as molecular stacking sequence and orientations,should be the origin of the self-healing behavior of these crystals.…”

“…Single-crystal X-ray diffraction (SCXRD) analysis shows that the as-prepared crystals belong to the monoclinic system (space group Cc)w ith the following unit cell parameters: a = 11.951(3), b = 32.621 (9), c = 7.212(2) , and b = 126.688(4)8 8,296 K(Supporting Information, Table S1 and Figure S1). Single-crystal X-ray diffraction (SCXRD) analysis shows that the as-prepared crystals belong to the monoclinic system (space group Cc)w ith the following unit cell parameters: a = 11.951(3), b = 32.621 (9), c = 7.212(2) , and b = 126.688(4)8 8,296 K(Supporting Information, Table S1 and Figure S1).…”

Anion-controlled dimer distance induced unique solid-state fluorescence of cyano substituted styrene pyridinium

“…In contrast the notorious aggregation-caused quenching (ACQ), branchy and twisted aggregation-induced emission (AIE) and aggregation-induced emission enhancement (AIEE) fluorogens are developed to tune the intermolecular stacking for efficient emissions in the solid state29303132. Alternative ways to regulate multifunctional materials are allomorphism and mischcrystal333435. This strategy do not involves tedious organic synthesis.…”

Hetero-nuclear coordinated compounds for use in high-performance supercapacitor electrode material design

“…Our strategy for synthesis large scale regular 3D hierarchical Ni x Co 3-x S 4 (x = 0.15-0.42) microflowers utilizes cobalt coordination complex and its ion exchanged derivatives as precursor because this method has given the high yield and the 60 reaction conditions which are suitable for the small chemical factories. The as-synthesized Ni x Co 3-x S 4 microflowers showed high specific capacitance, excellent rate capacity, and good cycling stability, and such characteristics contribute to the potential of these microflowers as electrode materials for high 65 performance supercapacitors. We investigated the process of central metal ion exchange to determine the tunable properties caused by cation-exchanged-induced SCSC transformation between the cobalt coordination complex and the cationexchanged products.…”