Five Multidimensional Co(II)-Complexes (Zero-Dimensional to Three-Dimensional) Derived from an Asymmetric 5-(Pyridin-3-yl)-1H-pyrazole-3-carboxylic Acid: Syntheses, Structures, and Magnetic Properties

摘要: 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 characterized magnetically structurally. Polymer 1, which has Schlafli symbol (42·62·82)2(42·6·83)2, is a three-dimensional (3D) network. 2 includes mononuclear subunit infinite two-dimensional (2D) framework subunit, while polymer 3 2D sheet structure. 4 by one-dimensional double ladder-like chain Complex 5 possesses binuclear Magnetization data for 1 with Co2 units show antiferromagnetic coupling in units. No long-range magnetic ordering observed 1. 2, 3, d...