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A Porous Coordination Polymer Showing Guest-Amplified Positive and Negative Thermal Expansion

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journal contribution
posted on 02.08.2021, 19:05 by Zi-Ming Ye, Kai-Ping Xie, Chao Wang, Xue-Wen Zhang, Hao-Long Zhou, Jie-Peng Zhang
A solvothermal reaction of Zn­(NO3)2 and 4-(1H-pyrazol-4-yl)­benzoic acid (H2pba) with toluene (Tol) as the template yielded a porous coordination polymer, [Zn­(pba)]·0.5Tol, possessing a three-dimensional (3D) fence-like coordination framework based on inclined two-dimensional (2D) fence-like coordination layers. By virtue of the classic deformation mode of the 2D/3D fence structures, the guest-free structure exhibits very large positive thermal expansion of 347 MK–1 and moderate negative thermal expansion of −63/–83 MK–1, which are remarkably enhanced to new records of 689 and −171/–249 MK–1, respectively, by inclusion of Tol.

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