Spectral, NLO, Fluorescence, and Biological Activity of Knoevenagel Condensate of 𝛽-Diketone Ligands and Their Metal(II) Complexes

Table 3

Electronic spectral data (cm⁻¹) (ε) of metal(II) complexes.

Complexes	Frequency (ε)	Assignment	Geometry
L1a	23148 (3015)	INCT	Distorted octahedral
	21097 (2131)	INCT
	9460 (856)	^2Eg → ^2T2g
L1b	9541 (350)	^4T1g (F) → ^4T2g (F)	Distorted octahedral
	16420 (760)	^4T1g→ ^4A2g
	19047 (1289)	^4T1g (F) → ^4T1g (P)
L1c	10582 (410)	^3A2g → ^3T2g	Distorted octahedral
	14471 (997)	^3A2g → ^3T1g (F)
	25038 (1425)	^3A2g → ^3T1g (P)
L2a	23529 (1895)	INCT	Square planar
	18867 (530)	^2B1g → ^2A1g
L2b	16474 (285)	^2B2 → ^2Eg	Square planar
	21852 (355)	^4A1g → ^4B1g
L2c	15337 (543)	^1A1g → ^1B1g	Square planar
	21582 (1564)	^1A1g → ^1A2g