DNA Binding Test X-Ray Crystal Structure Spectral Studies TG-DTA and Electrochemistry of CoX2(dmdphphen) (Dmdphphen Is 29-Dimethyl-47-diphenyl-110-phenanthroline X = Cl and NCS) Complexes

摘要

Two new neutral mixed-ligand cobalt(II) complexes, [CoCl2(dmdphphen)] >1 and [Co(NCS)2(dmdphphen)]  >2, where dmdphphen is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, were synthesized and characterized by an elemental analysis, UV-Vis, IR, TG/DTA, cyclic voltammetry CV, and single X-ray diffraction. Complex >2 crystallized as monoclinic with a space group P21/c. Co(II) ions are located in a distorted tetrahedral environment. TG/DTA result shows that these complexes are very stable and decomposed through one-step reaction. The two complexes exhibit a quasireversible one-electron response at −550 and 580 mV versus Cp2Fe/Cp2Fe⁺, which has been assigned to Co(I)/Co(II) and Co(II)/Co(III) couples. Absorption spectral studies reveal that such complexes exhibit hypochromicity during their interaction with CT-DNA.