Synthesis, Characterization, and Antibacterial Activity of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) Complexes of Schiff's Base Type Ligands Containing Benzofuran Moiety

Table 3

Electronic spectral bands and ligand field parameters of the Cu(II), Co(II), and Ni(II) complexes in DMF (10⁻³) solution.

Ligand	Complexes	Transition in cm^−1			𝐷𝑞 (cm^−1)	𝐵 (cm^−1)	β	β (%)	𝜈2/𝜈1	LFSE; (k.cal)
		𝜈1^a	𝜈2^b	𝜈3^b
𝐋𝟏 [C20H20O6 N2]	[Co(C20H20O6N2)Cl2]	7535	16628	21154	815.14	972.15	0.9606	1.42	2.206	14.88
	[Ni(C20H20O6 N2)Cl2]	9372	15342	25810	1237.5	869.06	0.6889	12.23	1.6370	31.33
	[Cu(C20H20O6N2)Cl2]	16194
𝐋𝟐 [C17H12N2O3]	[Co(C17H12N2O3)Cl2]	7340	15902	20752	799.39	975.60	0,9505	1.35	2.1665	14.92
	[Ni(C17H12N2O3)Cl2]	9415	15530	25637	1218.05	975.33	0.9513	17.11	1.649	32.11
	[Cu(C17H12N2O3)Cl2]	16205

aCalculated values. bMolar extension coefficient values are given in parenthesis (in units of L mol⁻¹ cm⁻¹).