Temperature, Cooling Rate, and Additive-Controlled Supramolecular Isomerism in Four Pb(II) Coordination Polymers with an in Situ Ligand Transformation Reaction

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• 作者：Dongsheng Deng ; Leilei Liu ; Bao-Ming Ji ; Guojie Yin ; Chenxia Du
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：November 7, 2012
• 年：2012
• 卷：12
• 期：11
• 页码：5338-5348
• 全文大小：710K
• 年卷期：v.12,no.11(November 7, 2012)
• ISSN：1528-7505

文摘

Solvothermal reactions of Pb(Ac)₂ with a new flexible 1,3-bis(4-pyridyl-3-cyano)propane (1, BPCP) ligand under different synthesis conditions via an in situ ligand transformation reaction produced three true coordination polymorphs, namely, [PbL^{2鈥?/sup>]_n (for 2 and 3) and [Pb₃L2鈥?/sup>₃]_n (4), as well as their polymorphic framework [(Pb₂L2鈥?/sup>)路2H₂O]_n (5) (H₂L = 1,3-bis(4-pyridyl-3-carboxyl)propane). These compounds were characterized by elemental analysis, IR, TG, PXRD, and single-crystal X-ray diffraction. In these compounds, the L2鈥?/sup>ligand exhibits different coordination conformations and modes tuned by different synthesis conditions, including reaction temperature, cooling rate, and additive, and constructs various architectures by bridging a variety of building units. Polymorphs 2 and 3 display a 3D framework with 1D channels built up from dinuclear ringlike [Pb₂L2鈥?/sup>₂] units and dinuclear semi-ring-like [Pb₂L2鈥?/sup>] units, respectively. Polymorph 4 also features a 3D architecture constructed from dinuclear ringlike [Pb₂L2鈥?/sup>₂] units interlinked by the L2鈥?/sup> ligand. Interestingly, the framework of 4 is big enough to allow the other net to penetrate to form a 2-fold interpenetrating framework with a trinodal (3,6,10)-connected topology with a point symbol of (43)(44路610路8)(48路624路89路104). For 5, there exists two kinds of dinuclear ringlike [Pb₂L2鈥?/sup>₂] units. These [Pb₂L2鈥?/sup>₂] units are interconnected by Pb atoms to afford a 2D undulant network that is further connected by the hydrogen-bonding interactions and weak interactions to afford a 3D supramolecular network. In addition, the photoluminescence properties of 1鈥?b>5 and the H₂L ligand in the solid state at room temperature were also investigated.}