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Two novel ligand pyrazole derivatives AH and BH (AH = ((3,5-dimethyl-1H-pyrazole-1- yl)methyl)amino acetic acid, BH = (bis-(3,5-dimethyl-1H-pyrazole-1-yl)methyl)amino acetic acid) formed simultaneously by the condensation of N-hydroxy methyl-3,5-pyrazole (1) with glycine (CH3COOH) and their cobalt(II) or copper(II) mixed ligand complex, with 3,5-dimethyl- 1H-pyrazole (Pz) have been synthesized and characterized by spectroscopic analysis and X-ray diffraction study. Distorted square pyramidal geometry is observed around copper(II) with two nitrogens (N1, N3 of AH) in the first plane and third nitrogen (N4 of one pyrazolic ligand) and two oxygen atoms (O4 and O1) in the second plane. In contrast to Cu(II) cation which coordinates with ligand AH, the Co(II) cation prefers to coordinate with the second ligand BH.

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Cobalt(II) and copper(II) in selective coordination of armed ligands: {[(3,5-dimethyl-1H-pyrazol-1-yl)methyl]amino}acetic acid and {[bis-(3,5-dimethyl-1H-pyrazol-1-yl)methyl]amino}acetic acid