Abstract
Three novel zwitterionic coordination polymers, namely, {[Zn(HCbdcp)2]·H2O} (1), {[Mn(Cbdcp)]·3H2O} (2) and {[Cu2(Cbdcp)(HCbdcp)Cl·H2O]·2H2O} (3), Cbdcp = 3,5-dicarboxy-1-(4-carboxybenzyl)pyridin-1-ium, have been prepared by a hydrothermal method and characterized by X-ray single crystal diffraction analysis, powder X-ray diffraction analysis, IR spectroscopy, and thermogravimetric analysis. With the changing of metal centers, these complexes show distinct structures: a mononuclear 2D 44-sql network for 1, a 3D 6,6-connected-type topology for 2 and a novel dinuclear 2D layer for 3. These diverse architectures prove that coordination geometry of metal ions, coordination modes of carboxylate groups and the rotationally flexible CH2 linker played significant roles in the construction of CPs; moreover, they also indicated that H3CbdcpCl is an ideal organic candidate for the building of novel structures. The solid-state luminescent properties of complexes 1–3 were investigated, respectively. In addition, the magnetic properties of 2 and 3 were studied and both of them exhibit antiferromagnetic behaviors.
Highlights
Flexible multicarboxylate zwitterionic ligands are one of the intensely studied topics in designing and constructing coordination polymers (CPs) [1,2,3,4], for they take advantage of carboxylate compounds, and develop their potentials as flexible ligands
Under hydrothermal conditions or when deprotonated, multicarboxylate groups in flexible multicarboxylate zwitterionic ligands are efficient to create diverse frameworks owing to their mutable linking or coordination modes [5,6,7,8]
Even though CPs have many values, controlling their frameworks is undoubtedly fundamental for determining the properties and applications of the crystalline materials
Summary
Flexible multicarboxylate zwitterionic ligands are one of the intensely studied topics in designing and constructing coordination polymers (CPs) [1,2,3,4], for they take advantage of carboxylate compounds, and develop their potentials as flexible ligands. Because of the existence of flexible linkers in zwitterionic ligands, such as alkyl and aryl, these kinds of ligands are able to freely bend and rotate in the assembly processes [9,10]. Despite the rapid developments in the construction of a diverse and interesting architectures, many factors in the assembly processes, such as metal ions, counter ions, solvents and temperature still affect the prediction of the precise structure. Obtaining the desirable architectures and the control of structures of CPs with suitable ligands and metal ions remains a long-term challenge to chemists
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