Ligands 3,3'-((1,7-dioxa-4,10-diazacyclododecane-4,10-diyl)bis(methylene))dibenzoic acid(L1H2) and 5,5'-((1,7-dioxa-4,10-diazacyclododecane-4,10-diyl)bis(methylene))diisophthalic acid (L2H4) are designed, synthesized and employed for the synthesis of novel Co(II) coordination polymers (CPs) of formula, CoL1�2H2O, (1 ) and Co2L2(H2O)2�2(H2O), (2) . 1  and 2  are characterized with X-ray single-crystal diffraction, FTIR, thermogravimetric analysis, temperature�dependent magnetic susceptibility. 1  crystallizes in a C2 space group as an infinite two-dimensional layeredcoordination network with a tetragonal 44 sql  net topology. The Co(II) ion is 6-coordinate with two nitrogen atoms and two oxygen atoms of the crown, and two carboxylate oxygen atoms from neighboring ligands and exhibits a highly distorted octahedral geometry.  The 2D layers are stacked and stabilized through hydrogen bonding between the ligand's carboxylates and the interlayer water molecules to form a 3D supramolecular structure. 2  crystallizes in a monoclinic P21/n space group as a triply interpenetrating 3D network with the uncommon sqc 528/dmd system. It exhibits two distinct Co(II); one is six coordinate in the center of the crown-4 along with two cis-coordinated water molecules in a highly distorted octahedral geometry, the other is 4-coordinate with tetrahedral geometry and a node in the framework. Temperature-dependent SQUID shows weak antiferromagnetic interactions in both compounds.

Synthesis, structure, and magnetic properties of novel 2D and 3D cobalt(II) coordination polymers based on N,N'-bis(methylene))dibenzoate or diisophthalate functionalized diaza-12-crown

245th National Meeting (2013)

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