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Schiff bases and their complexes: synthesis, characterization and their possible applications


Transition metal complexes participate in many chemical processes. The study of these complexes is very interesting because of the diversified chemistry and for their great utility. Transition metal complexes act as catalysts in various homogenous and heterogeneous systems. The catalytic activity of these complexes is due to the presence of only one active site for the catalytic reaction. Thus this type of reaction can be advantageous due to the elevated selectivity of the metal center.For these reasons, the object of this project is the systematic study involving various series of salen-type Schiff base transition metal complexes. The Schiff bases are for example:(1) tetradentates; (2) tetradentates potentially pentadentades; (3) asymmetric tetradentates; (4) asymmetric tridentate, and (5) asymmetric tridentate potentially tetradentates. The object of the use of these complexes as catalysts is not only an increase in the yield but also the stereoselectivity of the reaction products. The new catalysts will be initially characterized by various techniques such as their visible-ultraviolet and infrared spectra, and whatever other technique that is considered necessary. In the same way, the substrates used in this project will be previously characterized. The catalytic reaction should be carried out in flasks and the progress of the reaction monitored by gas chromatography. The products of the reactions also will characterized by what techniques deemed necessary. (AU)

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(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ARANHA‚ P.E.; SOUZA‚ J.M.; ROMERA‚ S.; RAMOS‚ L.A.; DOS SANTOS‚ M.P.; DOCKAL‚ E.R.; CAVALHEIRO‚ E.T.G. Thermal behavior of vanadyl complexes with Schiff bases derived from trans- N N′-bis (salicylidene)-1‚ 2-cyclohexadiamine ( t-Salcn). Thermochimica Acta, v. 453, n. 1, p. 9-13, 2007.

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