Synthesis and Spectral Studies of Some Transition Metal Complexes with New Thiazolylazo Ligand

Abstract

A new heterocyclic azo ligand 2-[(6-Methoxy-2-benzothiazolyl) azo]
hydroquinone (6-MBTAHQ= H2L) was prepared by the reaction between 6-methoxy-
2-benzothiazodiazonium chloride with hydroquinone in alkaline alcoholic solution.
Six new chelate complexes of Co (III), Ni (II), Cu (II), Zn (II), Cd (II) and Hg (II)
have been prepared and characterized by elemental analysis, magnetic susceptibility,
molar conductivity, infrared spectra and electronic spectra. The stability constants of
complexes follows the sequence; Cu (II) > Zn (II) > Hg (II) > Co (III) > Ni (II) > Cd
((II). The isolated solid complexes have proposed the general formula
[M(LH)2].XH2O, where X=1, M= Cu(II), Zn(II), Hg(II) and X=0 for M=Ni(II)
Cd(II). When M= Co (III) the formula is [M (LH)2]Cl. H2O. The different
measurements revealed that the metal ion in these complexes has hexa-coordination
number with octahedral structure..The analytical data show that the metal to ligand
ratio (M : L) in all complexes is (1 : 2) .