Synthesis, Characterization, and Antibacterial Activities of 1H-Imidazo [5, 6-f] [1,10] Phenanthroline-2(3H)-Thione and Its Ni(II) and Cu(II) Complexes

Table 4

Electronic spectra of the complexes.

Compound	Wave number (cm^−1)	Transition	Suggested geometry
Ligand (L)	38461		—
	34364
[NiC26H20N8O4]Cl2	38461	Intraligand	Oh
	33112	CT
	25575	^3A2g ⟶ ^3T1g (P)
	20202	^3A2g ⟶ ^3T1g (F)
[CuC26H20N8O4]Cl2	38461	Intraligand	Distorted Oh
	33333	CT
	29240	CT
	22472	^2Eg ⟶ ^2T2g