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YALÇIN, BAHATTİN

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YALÇIN

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BAHATTİN

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    Cu(II) and Pd(II) complexes of N-(2-hydroxybenzyl)aminopyridines
    (PERGAMON-ELSEVIER SCIENCE LTD, 2007) YALÇIN, BAHATTİN; Yalcin, Bahattin; Fatullayeva, Perizad A.; Bueyuekguengoer, Orhan; Kosar, Basak; Tascioglu, Suelin; Israfilov, Akif I.; Ibayev, Zaur D.; Medjidov, Ajdar A.; Aydin, Adnan
    N-(2-Hydroxybenzyl)aminopyridines (L) react with Cu(II) and Pd(II) ions to form complexes in the compositions Cu(Li)2(CH3COO)(2) center dot nH(2)O (n = 0.14), Pd(L-i)(2)Cl-2 center dot nC(2)H(5)OH (n = 0, 2) and Pd(L-2)(2)Cl-2 center dot 2H(2)O- In the complexes, the ligands are neutral and monodentate which coordinate through pyridinic nitrogen. Crystal data of the complexes obtained from 2-amino pyridine derivative have pointed such a coordinating route and comparison of the spectral data suggests the validity of similar complexation modes of other analog ligands. Cu(II) complex of N-(2-hydroxybenzyl)-2-aminopyridine (L), [Cu(L-1)(2)(CH3COO)(2)] has slightly distorted square planar cis-mononuclear structure which is built by two oxygen atoms of two monodentate carboxylic groups disposed in cis-position and two nitroaen atoms of two pyridine rings. The remaining two oxygen atoms of two carboxylic groups form two Cu and H bridges containing cycles which joint at same four coordinated copper(II) ion. IR and electronic spectral data and the magnetic moments as well as the thermogravimetric analyses also specify on mononuclear octahedric structure of complexes [Cu(L-2)(2)(CH3COO)(2) center dot 2H(2)O] and [Cu(L-3)(2)(CH3COO)(2) center dot 4H(2)O] where L-2 and L-3 are N-(2-hydroxybenzyl)-2- or 3-aminopyridines, respectively. X-ray analysis for [Pd(L-1)(2)Cl-2 center dot 2C(2)H(5)OH] show square planar environment around Pd(II) ion formed by two chlorine atoms in trans position and two nitrogen atoms of pyridine rings. The spectral data indicate structural similarity in the complexes obtained via ligand exchange between PdCl2(PhCN)(2) and 3-amino and 4-aminopyridine derivatives. (c) 2007 Elsevier Ltd. All rights reserved.
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    The syntheses, structure and properties of cobalt complexes with beta-alanine derivatives
    (PERGAMON-ELSEVIER SCIENCE LTD, 2006) YALÇIN, BAHATTİN; Tascioglu, S; Yalcin, B; Nasrullayeva, TM; Andac, O; Buyukgungor, O; Aydin, A; Medjidov, AA
    N-(2-hydroxynaphtalidene)beta-alanine (I) forms two type complexes with Co(II) ions: binuclear complex [CO2(Nap beta ala)(2)(.)2H(2)O](H2O)-H-. (III) and trinuclear mixed-valence complex {[Co(Nap beta ala)(2)](2)Co-.(H2O)(4)}(.)4H(2)O(.)2C(2)H(5)OH (IV). X-ray data and magnetic measurements indicated that trinuclear complex had Co-III-Co-II-Co-III distribution of oxidation states. Co(III) ions has weak distorted octahedric environment of four oxygen and two nitrogen atoms due to two ligand molecules per each. The tetrahydrate envelope of Co(II) ion is upgraded to octahedra with two oxygen atoms of two bridge carboxylic group of the ligand molecules which coordinates Co(III) ions. The azomethine bond in I is reduced to secondary amine group by sodium borohydride in dimethylformamide solution, which contains water. Cobalt (II) complex of the reduced Schiff base Co(RNaph beta ala)(.)2H(2)O (V) has been synthesized and its spectroscopic and magnetic properties are reported. Binuclear cobalt (II) complex of Schiff base is reduced by NaBH4 and complex V is obtained. Trinuclear mixed-valence complex IV Could not be reduced under similar conditions. (c) 2005 Elsevier Ltd. All rights reserved.