Manganese(II), cobalt(II) and nickel(II) complexes with 2-phenyl-3-(benzylamino)-1,2-dihydroquinazolin-4(3H)-one, pseudohalides and some bidentate N-donor ligands

Abstract

Some mixed ligand complexes of the type [M(L) (en or phen)(X) 2 ]; where M = Mn(II), Co(II) or Ni(II); L = 2-phenyl-3-(benzylamino)-1,2-dihydroquinazolin-4(3H)-one; en = ethylenediamine, phen = 1,10-phenanthroline; X = N 3 -or NCS -have been prepared. All the complexes were characterized by physico-chemical, spectroscopic and thermal studies. On the basis of electronic spectra and magnetic susceptibility measurements, an octahedral geometry has been proposed for all the complexes. The phen complexes are thermally more stable than the en complexes. The electrochemical behavior of the Ni(II) complexes showed that the complexes of phen are reduced at more positive potential compared to the corresponding en complexes.

Molecular, spectroscopic, and magnetic properties of cobalt(II) complexes with heteroaromatic N(O)-donor ligands

“…Complexes of divalent metal(II) with thiocyanate ligands are interesting because of their architectures organized by non-covalent contacts as hydrogen bonds or p-p stacking interaction [1]. Cobalt(II) complexes with N-donor ligands are investigated due to their structural properties (ability to occur as cis and trans isomers), formation of coordination polymers in which pseudohalide ligands are bridging as linear anions, examination of solvatochromic behavior of metal complexes [2][3][4][5][6]. Their interesting structural properties and potential application are attractive in studies of magnetism or magnetic exchange ions [7][8][9][10].…”