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    Investigation of Dipodal oxy-Schiff base and its salen and salophen Fe(III)/Cr(III)/Mn(III) Schiff bases (N2O2) caped complexes and their magnetic and thermal behaviors
    (ELSEVIER, 2014) Celikbilek, Seyma; Koc, Ziya Erdem
    Six new dinuclear Fe(III)/Cr(III)/Mn(III) complexes have been involved tetradentate (N2O2) Schiff bases (salenH(2)) and (salophenH(2)) with 2,4-bis(4-hydroxyphenylimino-4'-formylphenoxy)-6-methoxy-1,3, 5-triazine have been synthesized. The complexes were characterized as high-spin (S = 5/2) distorted trigonal bipyramidal salen/salophenFe(III) bridged, distorted trigonal bipyramidal (S = 3/2) salen/salophenCr(III) and high-spin distorted trigonal bipyramidal (S = 2) salen/salophenMn(III) by OH- groups. The structures of ligand and complexes were identified by using elemental analysis, thermal analysis, magnetic susceptibility, LC-MS, ICP-AES, H-1 NMR and FT-IR spectral data. (C) 2014 Elsevier B.V. All rights reserved.
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    SYNTHESIS OF STAR-SHAPED MACROMOLECULAR SCHIFF BASE COMPLEXES HAVING MELAMINE CORES AND THEIR MAGNETIC AND THERMAL BEHAVIORS
    (TAYLOR & FRANCIS INC, 2012) Uysal, Saban; Koc, Ziya Erdem; Celikbilek, Seyma; Ucan, H. Ismet
    We aim to study magnetic and thermal behaviors of some melamine cored macromolecular Schiff base complexes. In this context, tripodal ligands were synthesized by reacting melamine with 4-carboxybenzaldehyde or 4-hydroxybenzaldehyde. Then, 16 new trinuclear Fe(III), Cr(III), Mn(III), and Al(III) complexes were synthesized by reacting the ligands [ tris-(4-carboxybenzimino)-1,3,5-triazine) or tris-(4-hydroxybenzimino)-1,3, 5-triazine)] with pentadentate Schiff bases N,N'-bis(1-hydroxy-2-benzyliden)-1,7diamino-4-azaheptane or N,N'-bis(salicylidene) pyridine-2,6-diamine. Later, ligands and complexes were characterized by means of elemental analysis, infrared spectroscopy, H-1 NMR, liquid chromatography-mass spectrometry, thermal analyses, and magnetic susceptibility measurements. Finally, metal ratios of the prepared complexes were determined by using atomic adsorption spectrometry. The complexes were also characterized as distorted octahedral high-spin d(3) (S = 3 x 1/2) Cr(III), high-spin d(5) (S = 5 x 1/2) Fe(III), low-spin d(4) (S = 2 x 1/2) Mn(III), and diamagnetic Al(III) bridged by -OH group of COO- or OH group of phenol.