Synthesis, Characterization, and photoluminescent properties of Zn ^II, Cd^II, and Hg^II complexes with N,O hybrid pyrazole ligand

The synthesis and characterization by elemental analysis, mass spectrometry, conductance measurements, IR, 1H, and 13C NMR spectroscopies of compounds with the general formula [MCl 2(L)2], where M ≤ Zn (1), Cd (2), or Hg (3) and L ≤ 1-(2-hydroxyethyl)-3,5-dimethylpyrazole have been described. The 113Cd{1H} and 199Hg{1H} NMR spectra were also measured to investigate the coordination environment of the metal in solution. The structure of complex [ZnCl2(L)2] was determined by single-crystal structure analysis. The extended structure revealed a 1D chain caused by several OHCH3 intermolecular interactions. Moreover, we have determined the fluorescent properties of complexes 13; it was found that L demonstrates the higher sensibility to HgII ion, one of the most toxic agent in the environment. The preliminary results indicate that L could have a promising future for the detection of mercury in real environmental samples. © 2010 CSIRO.