Naser Eltaher Eltayeb

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New derivatives of thiosemicarbazone Schiff base with isatin moiety were synthesized L1-L6. The structures of these compounds were characterized based on the spectroscopic techniques. Compound L6 was further characterized by XRD single crystal. The interaction of these compounds with calf thymus (CT-DNA) exhibited high intrinsic binding constant(More)
Copper ion recognition and DNA interaction of a newly synthesized fluorescent Schiff base (HPyETSC) were investigated using UV-vis and fluorescent spectroscopy. Examination using these two techniques revealed that the detection of copper by HPyETSC is highly sensitive and selective, with a detection limit of 0.39 μm and the mode of interaction between(More)
The asymmetric unit of the title compound, C(20)H(15)N(3)O, contains two independent mol-ecules, each of which is disordered over two sets of sites corresponding to a rotation of approximately 180° of the dihydro-benzimidazoquinazoline moiety, with refined site occupancies of 0.7479 (13) and 0.2521 (12) for both mol-ecules. The pyrimidine rings are in sofa(More)
In the title complex, [Mn(C(20)H(12)Cl(2)N(2)O(2))Cl(CH(3)OH)], the Mn(III) atom is in an octa-hedral coordination geometry with the N(2)O(2) atoms of the doubly-deprotonated Schiff base forming a square around it. The chloride ion and the O atom of the methanol mol-ecule occupy the other two positions of the octa-hedron. The dihedral angle between the two(More)
The title compound, C(13)H(10)ClNO(2), exists in a trans configuration about the central C=N bond. The two benzene rings are almost coplanar, making a dihedral angle of 2.48 (10)°. An intra-molecular O-H⋯N hydrogen bond generates an S(6) ring motif. In the crystal structure, O-H⋯O hydrogen bonds link the mol-ecules into chains along [101]. Short C⋯Cl(More)
In the title complex, [Mn(C(22)H(18)N(2)O(2))Cl]·H(2)O, the Mn(III) center is in a distorted square-pyramidal configuration, with the N(2)O(2) dianionic tetra-dentate Schiff base ligand in the basal plane and the chloride ion in the apical position. The dihedral angle between the two outer phenolate rings of the tetra-dentate ligand is 8.25 (8)°. The(More)
In the title mononuclear complex, [Zn(C(21)H(16)N(3)O)Cl], the Zn(II) ion is coordinated in a distorted tetra-hedral geometry by two benzimidazole N atoms and one phenolate O atom from the tridentate Schiff base ligand and a chloride ligand. The benzimidazole ring system forms dihedral angles of 26.68 (9) and 56.16 (9)° with the adjacent benzene ring and(More)
In the title compound, C(11)H(11)FN(4)OS, an intra-molecular N-H⋯O hydrogen bond generates an S(6) ring. In the crystal, mol-ecules form chains through N-H⋯O hydrogen bonds, which are extended by N-H⋯S hydrogen bonds into an infinite three-dimensional network.
In the title compound, C(15)H(12)N(4)OS, the dihedral angle between the nine-membered indolin-2-one ring system and the phenyl ring is 2.72 (7)°. Intra-molecular cyclic N-H⋯O and C-H⋯S hydrogen-bonding inter-actions [graph set S(6)] are present, as are weak N-H⋯N inter-actions [graph set S(5)]. In the crystal, mol-ecules form centrosymmetric cyclic dimers(More)
A new Mn(III) complex, [MnCl(H(2)O)(L)].H(2)O.C(2)H(5)OH, where L=2,2'-[1,2-phenylenebis[nitrilomethylylidene]]bis(6-methoxyphenolate), has been synthesized and characterized by single-crystal X-ray diffraction. There is a good agreement between calculated and experimental structural data. The complex is crystallized in orthorhombic with space group Pbca.(More)