Synthesis,Physicochemical Properties,and Structure of Heterocyclic β-Aminovinyl Ketones and Related Copper(II) Complex

Heterocyclic -aminovinyl ketones (HL) and the copper complex CuL₂ are synthesized and studied by IR and ¹H NMR spectroscopies. The crystal structure of one of the tautomeric HL molecules is determined by X-ray diffraction analysis. The crystals are triclinic: a = 9.261(6) Å, b = 9.448(6) Å, c = 11.310(5) Å, = 96.74(5)°, = 99.46(5)°, = 93.60(5)°, space group P . The compound has the form of a ketoamine tautomer. The structure contains intramolecular and intermolecular hydrogen bonds. The latter link the molecules into the center-symmetric dimers.     

β-Aminovinyl ketonates with heterocyclic fragments

-Aminovinyl ketones containing heterocyclic fragments (tetrahydro-1-6,2-benzothiazine 1,1-dioxide and 2,3-dimethyl-1-phenyl-2,5-dihydro-1H-pyrazole-5-one) (LH) and their complexes with 3d-metals (Co^II, Ni^II, Cu^II, and Zn^II) were synthesized. The obtained ligands give rise to two types of ML₂ chelates with coordinated (coordination number 6; Co, Ni, Zn) and uncoordinated carbonyl group in the pyrazole fragment (coordination number 5; Cu).Translated from Zhurnal Obshchei Khimii, Vol. 74, No. 10, 2004, pp. 1709–1713.Original Russian Text Copyright © 2004 by Anpilova, Korshunov, Bicherov, Burlov, Borodkin, Zaletov, Uflyand, Garnovskii.This revised version was published online in April 2005 with a corrected cover date.     

Metal Complexes with Novel Ambidentate Ligands: β-Enaminovinylketones with Annelated 1,2-Benzothiazine-1,1-Dioxide Fragment and Antipyrine Substituent

The data on competitive binding of ligands in metal complexes with ambidentate ligands (Schiff bases and -aminovinylketones) were summarized. Special attention is given to chemical and electrochemical syntheses and structural study of novel chelates of heterocyclic enaminoketones with antipyrine substituent that form tetrahedral (Cu²⁺, Zn²⁺) or octahedral (Co²⁺, Ni²⁺) structures.