Synthesis, Spectroscopic Characterization, and In Vitro Antimicrobial Studies of Pyridine-2-Carboxylic Acid N′-(4-Chloro-Benzoyl)-Hydrazide and Its Co(II), Ni(II), and Cu(II) Complexes

Table 1

Antimicrobial activity of ligand and their metal complexes.

Compounds	Time hrs	S. aureus MTCC 3160		S. aureus MTCC 25923		C. albican MTCC 227		S. cerevisiae MTCC 361
		Diameter of zone; of inhibition (mm); 100 μg 50 μg		Diameter of zone of inhibition (mm); 100 μg 50 μg		Diameter of zone of inhibition (mm); 100 μg 50 μg		Diameter of zone of inhibition (mm); 100 μg 50 μg
HL	24	10	11	—	—	—	—	13	15
	48	12	15	—	—	—	—	13	16
[1]	24	10	12	13	16	19	17	19	14
	48	11	12	14	19	11	10	12	17
[2]	24	14	13	16	18	15	27	21	18
	48	—	—	—	—	11	29	12	19
[3]	24	—	—	—	—	13	10	12	10
	48	14	10	13	12	14	13	14	11
Gentamycin	24	22	24	22	24	—	—	—	—
	48	22	24	22	24	—	—	—	—
Amphotericin-B	24	—	—	—	—	17	21	17	21
	48	—	—	—	—	17	21	17	21