Syntheses, structures and magnetic properties of four coordination polymers based on nitrobenzene dicarboxylate and various N-donor coligands

Four new coordination polymers {[Ni(4-Nbdc)(bpa)(H2O)]}(n) (1), {[Co(4-Nbdc)(bPP) (H2O)]}(n) (2), {[Ni(4-NbdC)(bPP)(H2O)]center dot H2O}(n) (3), and {[Mn-2(3-Nbdc)(2)(bib)3]center dot 2H(2)O}(n) (4) (4-Nbdc=4-nitrobenzene-1,2-dicarboxylate, 3-Nbdc=3-nitrobenzene-1,2-dicarboxylate, bpa=1,2-bi(4-pyridyl)ethane, bpp=1,3-bis (4-pyridyl)propane, and bib=1,4-bis(1-imidazoly)benzene), were synthesized by hydrothermal reactions, and characterized by single-crystal X-ray diffractions, elemental analysis, FT-IR, PXRD, TGA and magnetic analysis. Complexes 1 and 2 display quasi-trapezoidal chain and brick-wall layer, and both of them contain metal-carboxylate binuclear units. Complexes 3 and 4 exhibit three-dimensional frameworks with the (6(6)) dia topology and (4(4).6(10).8)(4(4).6(2)) fsc topology, and both of them contain metalcarboxylate chains. The carboxyl groups with syn-anti coordination mode mediate effectively the weak ferromagnetic coupling interaction within Ni(II)-carboxylate binuclear in 1 (J=1.27 cm(-1)) and Ni(II)-carboxylate chain in 3 (J=1.44 cm(-1)), respectively, and the carboxyl groups with anti-anti coordination mode leads to the classic antiferromagnetic coupling interaction within Mn(II)-carboxylate chain in 4 (J= 0.77 cm(-1)). (C) 2014 Elsevier Inc. All rights reserved.