Abstract
On the basis of an asymmetric, conjugated, partially or wholly deprotonated 5-(pyridin-3-yl)-1H-pyrazole-3-carboxylic acid (H2ppc), five new complexes [Co2(ppc)2(H2O)]n (1), {[Co2(Hppc)4]·[Co(4,4′-bipy)2(H2O)4]·(OH)2·10H2O}n (2), [Co2(Hppc)4(4,4′-bipy)]n (3), {[Co(ppc)(pbbbm)]·H2O}n (4) [pbbbm = 1,4-bis(benzimidazole-1-ylmethyl)benzene)], and [Co(Hppc)2(mbbbm)]2 (5) [mbbbm = 1,3-bis(benzimidazole-1-ylmethyl)benzene)] have been synthesized and characterized magnetically and structurally. Polymer 1, which has the Schlafli symbol (42·62·82)2(42·6·83)2, is a three-dimensional (3D) network. Polymer 2 includes a mononuclear subunit and an infinite two-dimensional (2D) framework subunit, while polymer 3 is a 2D sheet structure. Polymer 4 is characterized by a one-dimensional double ladder-like chain structure. Complex 5 possesses a binuclear structure. Magnetization data for 1 with the Co2 units show the antiferromagnetic coupling in the Co2 units. No long-range magnetic ordering is observed for 1. 2, 3, and 5 d...
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