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Switchable Room‐Temperature Ferroelectric Behavior, Selective Sorption and Solvent‐Exchange Studies of [H 3 O][Co 2 (dat)(sdba) 2 ]⋅H 2 sdba⋅5 H 2 O
Author(s) -
Bhattacharya Saurav,
Pal Somnath,
Natarajan Srinivasan
Publication year - 2016
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201500564
Subject(s) - ferroelectricity , sorption , molecule , dielectric , polarization (electrochemistry) , chemistry , single crystal , crystal structure , adsorption , crystallography , inorganic chemistry , materials science , organic chemistry , optoelectronics
A newly synthesized compound, [H 3 O][Co 2 (dat)(sdba) 2 ] ⋅ H 2 sdba ⋅ 5 H 2 O ( I , dat=3,5‐diamino‐1,2,4‐triazole; H 2 sdba=4,4′‐sulfonyldibenzoic acid), has Co 2 “paddlewheel” units connected by sdba ligands to form one‐dimensional chains, which are connected by dat to form an anionic three‐dimensional structure with cds topology. The one‐dimensional channels in the structure contain water molecules, hydronium ions and H 2 sdba. The water molecules could be reversibly exchanged with D 2 O, CH 3 OH and C 2 H 5 OH molecules; these exchanges were performed in a single‐crystal‐to‐single‐crystal manner. Gas sorption studies on the dehydrated compound showed the selective adsorption of CO 2 over methane at 195 K. Nonlinear optical measurements indicated that I exhibits a second harmonic generation signal that is approximately one‐third that of urea. Studies of polarization versus electric field demonstrated compound I as a potential room‐temperature ferroelectric material with a saturation polarization of 0.23 μC cm −2 and remnant polarization of 0.14 μC cm −2 . The dehydrated compound exhibited a simple paraelectric behavior.