Synthesis, characterization and thermal study of some tetradentate Schiff base transition metal complexes
- 223 Downloads
Several mononuclear Co(II), Ni(II), Cu(II), and Fe(II) complexes of tetradentate salpren-type diimine, obtained from 3,5-di-tert-butyl-2-hydroxybenzaldehyde and 1,3-diaminopropane have been prepared and characterized by analytical, spectroscopic (FT-IR, UV–VIS) techniques, magnetic susceptibility measurements and thermogravimetric analyses (TG). The thermodynamic and thermal properties of complexes have been investigated. For further characterization Direct Insertion Probe-Mass Spectrometry (DIP-MS) was used and the fragmentation pattern and also stability of the ions were evaluated. The characterization of the end products of the decomposition was achieved by X-ray diffraction. The thermal stabilities of metal complexes of N,N′-bis(3,5-di-t-butylsalicylidene)-1,3-propanediamine ligand (L) were found as Ni(II) > Cu(II) > Co(II) > Fe(II).
KeywordsActivation energy Sterically hindered diimine Thermal decomposition Transition metal complexes
The authors gratefully acknowledge Basri Gülbakan and Ömür Çelikbıçak for helpful Mass Spectrometry measurements.
- 1.Sheldon RA, Kochi JR. Metal catalyzed oxidation of organic compounds. New York: Academic Press; 1981.Google Scholar
- 9.Kasumov VT, Yaman OS, Tas E. Synthesis, spectroscopy and electrochemical behaviors of nickel(II) complexes with tetradentate shiff bases derived from 3,5-But2-salicylaldehyde. Spectrochim Acta A. 2005;62(1–3):716–20.Google Scholar
- 11.van Krevelen DW, van Heerden C, Huntjons FJ. Kinetic study by thermogravimetry. Fuel. 1951;30:253–8.Google Scholar
- 15.Larrow JF, Jacobsen EN, Gao Y, Hong Y, Nie X, Zepp CM. A practical method for the large-scale preparation of [N,N′-Bis(3,5-di-tertbutylsalicylidene)-1,2-cyclohexanediaminato (2-)]manganese(III) chloride, a highly enantioselective epoxidation catalyst. J Org Chem. 1994;59(7):1939–42.CrossRefGoogle Scholar
- 16.Earnshaw A. Introduction to magnetochemistry. London: Academic Press; 1968.Google Scholar