Copper(II) complex with 6-(3,5-dimethyl-1H-pyrazol-1-yl)-2-(pyridin-2-yl)pyrimidin-4-amine: synthesis,crystal structure,and electronic spectroscopy |
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Abstract: | A copper(II) complex with 6-(3,5-dimethyl-1H-pyrazol-1-yl)-2-(pyridin-2-yl)pyrimidin-4-amine (L), CuLCl2], has been synthesized. This compound is formed irrespective of the Cu?:?L molar ratio (Cu?:?L?=?1?:?1, 2?:?1, and 20?:?1) in the MeOH/H2O/DMF mixture as a single product. ESI-MS data demonstrate that the additional amount of CuCl2 above the Cu?:?L?=?1?:?1 molar ratio, is effectively solvated, and high-nuclearity species are formed in trace amounts in the solution. The complex adopts a distorted square-pyramidal geometry with two chlorides and three nitrogen atoms from L. The electronic spectrum of the complex contains a broad band with a maximum at 12,820?cm?1 within the region characteristic for square-pyramidal chromophores CuA5 (A?=?Cl, N). Due to Cu?···?Cl contacts, the molecules of CuLCl2] form the dinuclear CuLCl2]2 unit. Surprisingly, the NH2-group participates in the formation of NH?···?Cl hydrogen bonds instead of the formation of (NH?···?N3(pyrimidine))2 synthon, which is common for N-heteroaromatic compounds containing the NH2-group in the α-position to aza-atom. These hydrogen bonds together with Cu?···?Cl contacts result in the formation of a 3-D-structure. |
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Keywords: | Copper(II) N-ligands Synthesis Supramolecular chemistry |
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