4.7- Phenanthroline-2-carboxylates 1-hydroxy

Copper(ii) complexes of 8-amino-7-hydroxy-4-methylcoumarin, 1,10-phenanthroline-2-carboxamide, 2-pyridone, 2,3-di-(2-pyridine N-oxide)-quinoxaline," pyridine carboxylates, l-(2 -pyridyl)-2-azonaphthol, and l-(2 -benzothiazolyl)-2-azonaphthol have also been reported. 

IR data for l,10-phenanthroline-7V,A/ -(m-nicotinato-A/,O)diaquacopper(II) nitrate show that the nicotinate bridges adjacent copper atoms through pyridine N and carboxyl O atoms.Copper(II) complexes of m- or o-[3-hydroxy-3-(/ -nitrosophenyl)-l-triazeno]benzoic acid have IR bands indicative of coordination by the O atom of the 7V-hydroxy group and the N atom of the triazene moiety. 

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