Synthesis, structure, spectroscopic properties and DFT studies on some 7-hydroxy-4-methyl-8-(arylazo)-2H-1-benzopyran-2-one and their complexes with some divalent transition metal ions

A series of new azo coumarin complexes were prepared and characterized by different analytical tools. The spectroscopic data indicated that the coumarin ligands act as monoanionic bidentate O and N donors.117