Syntheses and characterisation of tris(3-(pyridin-2-yl)-1H-pyrazol-1-yl) methane and its bis(μ-hydroxo) dicobalt(II) complex

Abstract

The new ligand tris(3-(pyridin-2-yl)-1H-pyrazol-1-yl)methane (HC(3-Pypz)3, 1) has been synthesised by the reaction of 2-(1H-pyrazol-3-yl)pyridine with CHCl3 and Na2CO 3 under phase-transfer conditions. The reaction of HC(3-Pypz) 3 with Co(BF4)2·6 H2O leads to the formation of dinuclear bis(μ-hydroxo) cobalt(II) complex [Co 2(μ-OH)2(HC(3-Pypz)3)2][BF 4]2·2MeOH (2). This complex was crystallographically characterised. It comprises a Co2(μ-OH) 2 core with bridging hydroxide ligands. The tripodal tris-(3-(pyridine-2-yl)-1H-pyrazol-1-yl)methane ligands coordinate each cobalt atom with one bidentate arm, respectively. By this chelating and at the same time bridging coordination mode an octahedral coordination environment is formed. ©ARKAT-USA, Inc.