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    Crystal structure of an unsymmetrical Schiff base, immobilization of its cobalt and manganese complexes on a silica support, and catalytic studies
    (Springer, 2013) Durak, Damla; Delikanli, Anil; Demetgul, Cahit; Kani, Ibrahim; Serin, Selahattin
    An unsymmetrical tetradentate Schiff base (H2L) was synthesized by the reaction of 3-methoxysalicylaldehyde, o-phenylenediamine, and salicylaldehyde in EtOH. H2L was characterized by single-crystallographic X-ray analysis. Its Co(II) and Mn(III) complexes ([CoL] and [MnLCl]) were prepared and immobilized on 3-aminopropyltriethoxysilane functionalized silica gel. The immobilized materials were found to be efficient catalysts for epoxidation of styrene in the presence of tert-BuOOH in acetonitrile at 40 A degrees C. The catalysts can be reused several times without significant loss of performance.
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    Schiff Base Polymers Obtained by Oxidative Polycondensation and Their Co(II), Mn(II) and Ru(III) Complexes: Synthesis, Characterization and Catalytic Activity in Epoxidation of Styrene
    (Taylor & Francis Ltd, 2012) Demetgul, Cahit; Delikanli, Anil; Saribiyik, Oguz Yunus; Karakaplan, Muruvvet; Serin, Selahattin
    In this paper, Schiff base monomers having double azomethine groups, N,N'-bis(4-hydroxybenzylidene)1, 4-phenylenediamine (M-1) and N,N'-bis(4-hydroxysalicylidene)1,4-phenylenediamine (M-2), were prepared by a common condensation reaction between 4-hydroxybenzaldehyde and 4-hydroxysalicylaldehyde with 1,4-phenylenediamine, respectively. The new Schiff base polymers, poly(N,N'-bis(4-hydroxybenzylidene)1,4-phenylenediamine) (P-1) and poly(N,N'-bis(4-hydroxysalicylidene)1,4-phenylenediamine) (P-2) were synthesized from the oxidative polycondensation of monomers with NaOCl in an aqueous alkaline medium. The characterization of synthesized monomers and polymers was carried out by FT-IR, UV-Vis, H-1-NM, C-13-NMR and elemental analysis. The new polymer-metal complexes were prepared by using polymers and Co(II), Mn(II) and Ru(III) metal salts. Thermal properties of the compounds were studied by TG-DTA techniques. In addition, the catalytic properties of the polymers and their metal complexes were investigated in epoxidation reactions of styrene. The results of the catalysis studies were monitored by GC-MS. (C) Koninklijke Brill NV, Leiden, 2012