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J. Mater. Chem., 2009, 19, 8442 - 8447, DOI: 10.1039/b915459k

Syntheses, structures, and magnetic properties of heterometallic coordination polymers with carboxyphosphonate linkers

Zhi-Guo Gu and Slavi C. Sevov

Five heterometallic coordination polymers were synthesized utilizing the multifunctional carboxyphosphonate ligand N-(phosphonomethyl)iminodiacetic acid (H4PMIDA), N(CH2PO(OH)2)(CH2COOH)2, with a coordinating nitrogen atom and two carboxylate and one phosphonate groups. The compounds were characterized structurally and magnetically. [Cu2M2(PMIDA)2(H2O)6]·3H2O for M = Mn (1-CuMn), Co (2-CuCo), and Cd (3-CuCd) are isostructural (space group P21/n) and made of honeycomb-like 2D layers which, in turn, are made of unusual double-stranded meso-helices. [Cu2Ln2(PMIDA)2(C2O4)(H2O)6]·3.5H2O for Ln = La (4-CuLa) and Nd (5-CuNd)) are also isostructural (P21/c) but with open 3D framework structures. They contain dinuclear CuLn(PMIDA) secondary building units that are bridged by phosphonate tetrahedra and form infinite chains along the c axis. The chains are interconnected via carboxylic groups and form double-decker layers which, in turn, are connected by the oxalate linkers to form the open three-dimensional framework. The magnetic properties of the compounds were measured and analyzed in detail.

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