Comparative spectroscopic and DFT calculations of binary and ternary complexes derived from 4-allyl-1-(2-hydroxybenzoyl) thiosemicarbazide (L¹) and 2,2'-dipyridyl

Comparative studies between 4-allyl-, 4-phenyl- and 4-ethyl-1-(2-hydroxybenzoyl) thiosemicarbazides and the synthesis, characterization and DFT calculations of binary and ternary complexes derived from 4-ethyl (L(1)) and 2,2'-dipyridyl

The metal complexes of 4-ethyl-1-(2-hydroxybenzoyl) thiosemicarbazide (L(1)) with MCl2 (M=Co(2+), Cu(2+) and Zn(2+)) and Zn(Ac)2 in EtOH were synthesized and characterized using spectral (IR, (1)H-NMR, mass, UV-Visible), magnetic moment and thermal measurements. Binary and ternary complexes with the general formulae, [Cu(L(1)-H)2]·EtOH, [Co(L(1)-H)2], [Zn3(L(1)-H)(L(1))(Ac)5], [Cu2(L(2))2(L(1)-2H)2(H2O)2]·4H2O, [Co(L(2))(L(1)-2H)]·3H2O and [Zn2(L(2))(OH)(L(1)-3H)(H2O)]·1/2EtOH where L(2) is 2,2'-dipyridyl, have been suggested and characterized. The bond lengths, bond angles, chemical reactivates, energy components, binding energies and dipole moments for the isolated complexes were evaluated by DFT method from DMOL(3). Also, the MEP for L(1) is illustrated. The existence of the OH group in the Zn(2+) ternary complexes is confirmed by IR, mass and (1)H-NMR spectra. Biological activity for the L(1) and some its complexes was tested against DNA. Comparative studies between the ligation behavior and reactivity of our previous work derived from 4-phenyl- and 4-allyl-1-(2-hydroxybenzoyl) thiosemicarbazides have been investigated.

Synthesis of novel binary and ternary complexes derived from 1-(2-hydroxy benzoyl)-4-phenylthiosemicarbazide (L(1)) and 2,2'-dipyridyl (L(2)) with Co(II), Cu(II) and Zn(II) salts

The complexes derived the reactions of 1-(2-hydroxybenzoyl)-4-phenylthiosemicarbazide (L(1)) with MX2 (M = Co(II), Cu(II) and Zn(II) ions; X = Cl(-) in case of Co(II) and Cu(II) ions, Cl(-) and Ac(-) in case of Zn(II)) in EtOH, were synthesized and characterized. The results suggested that the complexes have the general formulae, [Cu(L(1)-2H)(EtOH)(H2O)2]⋅H2O, [Co(L(1)-2H)(EtOH)(H2O)]⋅2H2O and [Zn(L(1)-2H)(EtOH)]. Also, the ternary complexes, derived from the reactions 2,2'-dipyridyl (L(2)) with the metals salts followed by adding a solution of the L(1) were synthesized and having the general formulae, [Cu2(L(2))(L(1)-2H)(H2O)(OH)2]⋅1/2H2O, [Co(L(2))(L(1)-2H)]⋅1.5EtOH⋅3H2O and [Zn(L(2))(L(1)-2H)]⋅EtOH. The binary and ternary complexes were characterized by elemental analyses, molar conductivities, spectral (IR, UV-Vis, (1)H-NMR and mass), thermal and magnetic measurements. The existence of OH group in the ternary complexes was confirmed by IR spectra. The amounts of solvent were determined from the results of TGA. The biological activity for the ligand and two complexes were tested against DNA.