Abstract
Co(II), Cd(II) and Rh(III) complexes with 2-(1H-1,2,4-triazol-3-yl)pyridine (Htzp) as ligand were synthesized and investigated.
The neutral mononuclear complexes with a generic [M(tzp)n] structure have been prepared from Htzp and corresponding
transition metals chlorides at 2:1 and 3:1, respectively molar ratios in H2O–EtOH. The resulted crystalline complexes were
investigated through magnetic and molar conductivity measurements, elemental analysis, FT-IR, mass spectroscopy, thermal
analysis, UV-Vis and P-XRD. The experiments indicate that Htzp acts as bidentate anionic ligand, [Co(tzp)2]·1.5H2O and
[Cd(tzp)2] are in the tetragonal coordination, whereas six coordinate octahedral [Rh(tzp)3]·H2O complex undergoes a weak
tetragonal distortion. In case of Co(II) complex, an interesting feature was revealed through fluorescence spectroscopy, as the
fluorescent emission intensity of the free ligand is dependent on the Co(II) solution content. Through complexation, the
fluorescence is gradually quenched according to the Co(II) aqueous solution content, which may recommend it as a method of
detection of Co(II) presence in waste water.