Ni(II), Cu(II), Mn(II), and Fe(II) Metal Complexes Containing 1,3-Bis(diphenylphosphino)propane and Pyridine Derivative: Synthesis, Characterization, and Antimicrobial Activity

Table 3

Electronic spectral data of free ligand and its complexes.

Ligands and complexes	νmax (cm^−1)	Assignment	µeff. (BM)
DPPP	40,000	π ⟶ π^∗	—
APY	31,746	n ⟶ π^∗	—
Ni(II) complex	19,920	d-d transition	3.20
	31,948	n ⟶ π^∗
	36,764	π ⟶ π^∗
Cu(II) complex	20,161	d-d transition	1.74
	29,325	n ⟶ π^∗
	39,840	π ⟶ π^∗
Mn(II) complex	20,040	d-d transition	5.30
	32,573	n ⟶ π^∗
	36,900	π ⟶ π^∗
Fe(II) complex	19,841	d-d transition	5.46
	31,847	n ⟶ π^∗
	37,037	π ⟶ π^∗