Solvothermal syntheses, structures, and magnetic properties of three cobalt coordination polymers constructed from naphthalene-1,4-dicarboxylic acid and bis(imidazole) linkers.

Three new Co(II) coordination polymers with formulas of {[Co 2 ( L 1 )(1,4-NDC) 2 ]·3H 2 O} n ( 1 ), [Co 3 ( L 2 ) 2 (HCOO) 2 (1,4-NDC) 2 ] n ( 2 ) and [Co 2 ( L 2 )( μ 3 -OH)(1,4-NDC) 1.5 ] n ( 3 ) (1,4-H 2 NDC = Naphthalene-1,4-dicarboxylic acid, L 1 = di(1 H -imidazol-1-yl)methane, L 2 = 1,4-di(1 H -imidazol-1-yl)benzene) were solvothermal synthesized from 1,4-H 2 NDC with the aid of three different length-controllable auxiliary ligands and fully characterized. Their structures are determined by single-crystal X-ray diffraction, IR spectra, elemental analysis, powder X-ray diffraction and thermogravimetric analysis. Complexes 1 and 3 display 3D framework structures, corresponding to a 6-connected (4 12 ·6 3 ) net, a 8-connected (4 24 ·5·6 3 ) net, respectively. However, it is noteworthy that the complex 1 displays a 2-fold interpenetrating framework structure, complex 3 possesses a self-interpenetrating framework structure. Complex 2 displays 2D 4-connected undulating plane net structure. Moreover, magnetic studies indicate antiferromagnetic interactions between the Co(II) ions in the four complexes. [ABSTRACT FROM AUTHOR]