Collect. Czech. Chem. Commun. 2009, 74, 535-544
Published online 2009-03-18 11:49:36

Structure of 2:1 cobalt(III) complexes derived from arylazocitrazinic acid

Jaroslava Kořínkováa,*, Antonín Lyčkab, Aleš Ceec, Milan Nádvorníka, Robert Jiráskoa and Radim Hrdinaa

a Faculty of Chemical Technology, University of Pardubice, Studentská 95, CZ-532 10 Pardubice, Czech Republic
b Research Institute for Organic Syntheses, Rybitví 296, CZ-533 54 Pardubice 20, Czech Republic, and Faculty of Education, University of Hradec Králové, Rokitanského 62, CZ-500 03 Hradec Králové, Czech Republic
c Foerstrova 1688/5, CZ-500 02 Hradec Králové, Czech Republic


1H, 13C NMR and MS spectra of the 2:1 cobalt(III) complexes, the azo coupling products of 2-aminophenol or 2-aminobenzoic acid with the citrazinic acid, were measured and analysed. It was found that the cobalt atom is six-coordinated being bound to two oxygens (one from primary and one from secondary component) and the nitrogen of 2-aminophenol or 2-aminobenzoic acid. Molar magnetic susceptibility data proved the presence of Co(III). Diazotisation of 2-aminophenol or 2-aminobenzoic acid and subsequent coupling reaction with citrazinic acid and complexation of the formed azo product proceeded on standard way.

Keywords: Citrazinic acid; Complexation; Co(III) complexes; Chelates; Cobalt; NMR spectroscopy; Mass spectrometry.

References: 19 live references.