【研究發展處訊】

化學系王志傑特聘教授發表期刊論文

Synthesis, Structural Characterization, and Water Vapor Sorption Behavior of Two Ligand Ratio-Dependent Supramolecular Networks, [Cd(2,2 '-bpym)(1.5)(BDC)]center dot 0.5(2,2 '-bpym)center dot 5H(2)O and [Cd(2,2 '-bpym)(0.5)(BDC)(H2O)(3)]

作者：Chih-Chieh Wang, Geng-Min Lin, Cheng-Han Lin, Tsai-Wen Chang, Szu-Yu Ke, Chuan-Yien Liu, Gene-Hsiang Lee, Bo-Hao Chen, and Yu-Chun Chuang

ACS OMEGA (SCI)

卷冊：7  期：16  頁碼：14089-14101

DOI：10.1021/acsomega.2c00652

出版日期：APR 26 2022

Abstract

Two ligand ratio-dependent supramolecular networks, [Cd(2,2'- bpym)(1.5)(BDC)]center dot 0.5(2,2'-bpym)center dot 5H(2)O (1) and [Cd(2,2'-bpym)(0.5)(BDC)(H2O)(3)] (2), (BDC2- = dianion of terephthalic acid and 2,2'-bpym = 2,2'-bipyrimidine) have been synthesized and structurally characterized by the single-crystal X-ray diffraction method. Structural determination reveals that compound 1 is a two-dimensional (2D) layered metal-organic framework (MOF) constructed via the bridges of Cd(II) ions with 2,2'-bpym and BDC2- ligands, and compound 2 is a zero-dimensional (0D)2,2'-bpym-bridged di-Cd(II) monomeric complex. When the thermally dehydrated powders of 1 (at 100 degrees C) were immersed into water solution, most of the dehydrated powders of 1 underwent structural transformation back to rehydrated 1, but very little amounts of the dehydrated powders of 1 were decomposed to light-brown crystals of 2 or colorless crystals of a new coordination polymer (CP), [Cd(2,2'-bpym)(BDC)-(H2O)]center dot 3H(2)O (3), with its one-dimensional (1D) zigzag chain-like framework being constructed via the bridges of Cd(II) ions with the BDC2- ligand. Structural analysis reveals that all 3D supramolecular networks of 1-3 are further constructed via strong intermolecular interactions, including hydrogen bonds and pi-pi stacking interactions. Compounds 1 and 2 both exhibit significant water vapor hysteresis isotherms, and their cyclic water de-/adsorption behavior accompanied with solid-state structural transformation has been verified by de-/rehydration TG analyses and powder X-ray diffraction (PXRD) measurements.

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