Thermal and Gas Dual-Responsive Behaviors of an Expanded UiO-66-Type Porous Coordination Polymer

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• 作者：Hao-Long Zhou ; Dr. Jie Bai ; Jia-Wen Ye ; Zong-Wen Mo ; Dr. Wei-Xiong Zhang ; Prof. Jie-Peng Zhang and Prof. Xiao-Ming Chen
• 刊名：ChemPlusChem
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：81
• 期：8
• 页码：817-821
• 全文大小：992K
• ISSN：2192-6506

文摘

Through a modified solvothermal reaction using benzoic acid as an additive, the fcu-type framework [Zr₆O₄(OH)₄(edba)₆] (H₂edba=4,4′-(ethyne-1,2-diyl)dibenzoic acid), an expanded version of UiO-66, is synthesized as high-quality single crystals, which can retain their single-crystallinity after solvent exchange and degas treatments. In situ variable-temperature single-crystal X-ray diffraction measurements show that the guest-free framework exhibits a remarkably large isotropic negative thermal expansion (α=−11.0×10⁻⁶ K⁻¹) as a result of the transverse vibrational bending of the long organic ligand. By virtue of the relatively large π-conjugation system of the organic ligand, [Zr₆O₄(OH)₄(edba)₆] also exhibits bright blue luminescence, which can be quenched efficiently by gaseous O₂ (K_sv=2.4 bar⁻¹).