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 Na2CO3 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 (Co2(µ-OH)2(HC(3-Pypz)3)2)(BF4)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.
Highlights
N donor stabilised cobalt complexes have been reported for a multitude of catalytic applications, e.g. as catalysts for industrially useful oxidation processes like the oxidation of alkenes[1] and for various polymerisation processes
The first tris(pyrazolyl)methane was synthesised in 1937 by Hückel and Bretschneider with the reaction of pyrazole potassium salt and chloroform,[6] but the complicated synthesis hindered its wide application in coordination chemistry
Synthesis In general, tris(pyrazolyl)methanes are synthesised under liquid-liquid phase transfer conditions by the reaction of the corresponding pyrazole, chloroform and excess base.[7,8]
Summary
N donor stabilised cobalt complexes have been reported for a multitude of catalytic applications, e.g. as catalysts for industrially useful oxidation processes like the oxidation of alkenes[1] and for various polymerisation processes. The tripodal tris-(3-(pyridine-2-yl)-1H-pyrazol-1-yl)methane ligands coordinate each cobalt atom with one bidentate arm, respectively. We report on the synthesis and characterisation of the new ligand and a structural characterisation of its cobalt(II) bis(μ-hydroxo) dicobalt(II) complex [Co2(μ-OH)2(HC(3-Pypz)3)2][BF4]2·2MeOH (2).
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