Synthesis, characterization, crystal structure and electrochemical behavior of a nickel(II) complex of 5,6-dihydro-2H-pyran-3-aldehyde thiosemicarbazone

• Published in: Transition metal chemistry (Weinheim) 2005-03, Vol.30 (2), p.121-127
• Main Authors: Harek, Yahia, Larabi, Lahc ne, Boukli, Leila, Kadri, Fatima, Benali-Cherif, Noureddine, Mostafa, Mohsen M.
• Format: Article
• Language: English
• Subjects: Crystal structure; Electrodes
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1007/s11243-004-1565-x

A new Ni^sup II^ complex of 5,6-dihydro-2H-pyran-3-aldehyde thiosemicarbazone (HDPTSC) has been synthesized and characterized by microanalyses, magnetic susceptibility, molar conductance measurements and by spectral methods (i.r., u.v.-vis., ^sup 1^H-n.m.r.). The structure of [Ni(DPTSC)^sub 2^] · B DMF has been solved using X-ray diffraction and found to be highly symmetrical with a trans -arrangement of the two bidentate ligands. The thiosemicarbazone coordinates as an anionic ligand via the thiosemicarbazone moiety's azomethine nitrogen and thiolate sulfur [on loss of the N2 hydrogen]. The electrochemical behavior of the ligand and its Ni^sup II^ complex, determined by cyclic voltammetry, shows that the redox process of the ligand was highly irreversible, whereas the redox process of the Ni^sup II^ complex was observed as a one electron transfer process in a quasi-reversible and diffusion-controlled reaction.[PUBLICATION ABSTRACT]