Investigation of Antimicrobial, Antioxidant, and DNA Binding Studies of Bioactive Cu(II), Zn(II), Co(II), and Ni(II) Complexes of Pyrimidine Derivative Schiff Base Ligand

Table 6

Absorption spectral properties of HL and complexes 1–4 with CT-DNA.

Compounds	Free; (nm)	Bound; (nm)	Red shift	Type of chromism	Hypochromism; (%)	Binding constant ()
HL	293	294	01	Hypochromism and red shift	22.45	1.06 × 10^4
1	298	304	06	Hypochromism and red shift	40.82	4.76 × 10^5
2	300	305	05	Hypochromism and red shift	29.38	9.28 × 10^4
3	302	307	05	Hypochromism and red shift	38.74	1.27 × 10^5
4	301	306	05	Hypochromism and red shift	35.42	1.02 × 10^5