Reaction of the ligand 3-(pyridin-2-yl)pyrazole (L) with Cu(ClO4)2 and CuX2 (X=Cl, Br, I) gives complexes with stoichiometry [Cu(L)2X]ClO4 (X = Cl, Br, I). The new complexes were characterized by elemental analyses and infrared and electronic spectroscopy. The crystal structure of the [Cu(L)2Br]ClO4 was determined by X-ray crystallography. The cation complex (i.e. [Cu(L)2Br]P) contains copper(II) with a distorted trigonal bipyramid geometry with a Br― ligand occupying an equatorial site. The penta-coordinated metal atom is bonded to two pyridinic nitrogens, two pyrazolic nitrogens, and one bromide anion. The pyrazolic H atoms are hydrogen bonded to Br atoms, resulting in infinite hydrogen-bonded chains running in the b direction. There are π‐π stacking interactions (charge-transfer arrays) between the parallel aromatic rings belonging to adjacent chains that may help to form hydrogen bonding in the coordination geometry around Cu (II).
Journal of Coordination Chemistry
Volume 56, 2003 - Issue 6
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