Synthesis Characterization and Biological Activities of Coordination Compounds of 4-Hydroxy-3-nitro-2H-chromen-2-one and Its Aminoethanoic Acid and Pyrrolidine-2-carboxylic Acid Mixed Ligand Complexes

Table 2

Electronic spectra bands (nm) for the ligands and complexes.

Compounds	1	2	3	4	d-d
Bands (nm)
Hnc	205	220	297	410
	199	230	331
	197	234
1				392	548, 632	2.6
2				460	—
3				370	668, 720	1.53
4				480	—	0
5				370	670	1.42
6				484	—	0