Syntheses, structures, and magnetic properties of two 1D, mixed-ligand, metal coordination polymers, [M(C4O4)(dpa)(OH 2)] (M = CoII, NiII, and ZnII; dpa = 2,2′-dipyridylamine) and [Cu(C4O4)(dpa)(H 2O)]2·(H2O)

Chih Chieh Wang, Cheng Han Yang, Gene Hsiang Lee, Hui Lien Tsai

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31 Citations (Scopus)


Two metal coordination polymers with general formula [M(dpa)(C 4O4)(H2O)] [M = Co (1), Ni (2), Zn (3); dpa = 2,2′-dipyridylamine] and [Cu(dpa)(C4O4)(H 2O)]2·H2O (4) have been synthesized under hydrothermal conditions. The single-crystal X-ray analyses reveal that compounds 1-3 are isostructural and possess distorted octahedral metal centers coordinated by two squarates, one dpa, and two water molecules. A 1D two-legged ladder-like framework is formed by interconnection of the water-bridged [M(dpa)(μ2-OH2)]24+ dimeric fragments and μ1,2-squarate ligands. Intra- and intermolecular hydrogen bonds between squarate, water, and dpa ligands, as well as the π-π stacking interaction of the pyridyl ring in the dpa ligands, provide extra forces to stabilize the extended network. Conversely, the molecular structure of compound 4 contains two distorted square-pyramidal CuII centers coordinated by two squarates, one dpa ligand, and one water molecule. The squarates adopt a μ1,2-binding mode to link the Cu centers and form a 1D helical chain. For compound 2, the magnetic exchange couplings between metal centers are analyzed with a binuclear magnetic model. The resulting negative magnetic exchange coupling constant indicates an antiferromagnetic interaction within the dimers. The magnetic behavior of compound 4 is typical of paramagnetic CuII ions.

Original languageEnglish
Pages (from-to)1334-1342
Number of pages9
JournalEuropean Journal of Inorganic Chemistry
Issue number7
Publication statusPublished - 2005 Apr 8

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

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