校園頭條

【研究發展處訊】

化學系王志傑特聘教授及何美霖特聘教授發表最新期刊論文

Sponge-Like Water De-/Ad-Sorption versus Solid-State Structural Transformation and Colour-Changing Behavior of an Entangled 3D Composite Supramolecuar Architecture, [Ni₄(dpe)₄(btc)₂(Hbtc)(H₂O)₉]·3H₂O

作者：Chih-Chieh Wang, Szu-Yu Ke, Kuan-Ting Chen, Ning-Kuei Sun, Wei-Fang Liu, Mei-Lin Ho, Bing-Jyun Lu, Yi-Ting Hsieh, Yu-Chun Chuang,Gene-Hsiang Lee, Shi-Yi Huang, and En-Che Yang

POLYMERS

卷：10  期：9  文獻號碼：1014

出版日期：2018年9月(SCI)

摘要：

An entangled composite compound, [Ni₄(dpe)₄(btc)₂(Hbtc)(H₂O)₉]·3H₂O (1), where H₃btc = 1,3,5-benzenetricarboxylic acid and dpe = 1,2-bis(4-pyridyl)ethane, has been synthesized and structurally characterized. Single-crystal structural determination reveals that compound 1 consists of four coordination polymers (CPs), with two two-dimensional (2D) (4,4) layered metal-organic frameworks (MOFs) of [Ni(dpe)(Hbtc)(H₂O)] and [Ni(dpe)(btc)(H₂O)]⁻ anion, and two one-dimensional (1D) polymeric chains of [Ni(dpe)(btc)(H₂O)₃]⁻ anion and [Ni(dpe)(H₂O)₄]²⁺ cation, respectively. The three-dimensional (3D) supramolecular architecture of 1 is constructed via the inter-penetration of inter-digited, double-layered, 2D rectangle-grid MOFs by two 1D coordination polymeric chains, and tightly entangled together via the combination of inter-CPs π–π stacking and hydrogen bonding interactions. The ad-/de-sorption isotherms of 1 for water displays a hysteresis profile with a maximum adsorption of 17.66 water molecules of per molecule unit at relative P/P₀ < 0.89. The reversible de-/re-hydration processes in 1 monitored by cyclic water de-/ad-sorption TG analysis and PXRD measurements evidence a sponge-like water de-/ad-sorption property associated with a thermal-induced solid-state structural transformation. The magnetic property of 1 suggests that the ferromagnetic coupling might refer to a stronger inter-Ni(II) interaction, which could be along the btc³⁻ or Hbtc²⁻ ligands; the antiferromagnetic coupling corresponding to the weaker inter-Ni(II) interactions, which could be the dpe ligands for the 2D framework.

Keywords

coordination polymer, metal-organic framework, supramolecular architecture, structural transformation, photoluminescence, magnetic property

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