Mukerrem Kurtoglu

Synthesis and Characterization of New Trinuclear vic‐Dioxime Complexes with Ni(II) and Cu(II) Ions

Abstract A new vic‐dioxime ligand, [5,6;11,12‐di(cyclohexyl)2,3‐bis(hydroxyimino)‐8,9‐diimino‐1,4‐diazacyclododecanenickel(II)]chloride, [NiDHDD]Cl2 (2), has been synthesized by the template condensation reaction of [N,N′‐bis‐(2‐aminocyclohexyl)‐ethanedialdiminenickel(II)]chloride, [NiBAED]Cl2 (1) with anti‐dichloroglyoxime in methanol solution at −10 °C. A homotrinuclear complex of [NiDHDD]Cl2 (2), is formed with Ni(II) chloride and a heterotrinuclear complex of this ligand with Cu(II) chloride has been synthesized. The complexes [M(NiDHDD)2]Cl4 have been characterized on the basis of elemental analyses, magnetic susceptibility measurements, conductivity measurements, IR and electronic spectral studies. The trinuclear Ni(II) and Cu(II) complexes of the vic‐dioxime ligand [NiDHDD]Cl2 (2), have a M:ligand ratio of 1:2 and the ligand coordinates only through the N,N atoms, as do most vicinal dioximes. The molar conductivities in DMF solution indicate the electrolytic nature for the complexes.

TEMPLATE SYNTHESIS OF TWO NEW GLYOXIME DERIVATIVES. CHARACTERIZATION AND INVESTIGATION OF THEIR COMPLEXES WITH Ni(II), Cu(II), AND Co(II) METAL IONS

Two novel oximes containing di- and tetraoxime groups, dichloro-[N,N′-bis(2-aminophenyl)diaminoglyoxime]nickel(II), [Ni(LH2)Cl2], and {dichloro-[5,6:11,12-dibenzo-2,3,8,9-tetra-(hydroxyimino)-1,4,7,10-tetraazacyclododecane]}- nickel(II), [Ni(LH4)Cl2], have been synthesized by the template condensation reaction of dichloro-[N,N′-bis-(1,2-diaminobenzene)]nickel(II) with anti-dichloroglyoxime. Trinuclear complexes of [Ni(LH2)Cl2] with Ni(II), Cu(II) and Co(II) have been synthesized. A polynuclear complex of [Ni(LH4)Cl2] with Ni(II) has been prepared. The structures of these novel oxime compounds are proposed on the basis of the elemental analyses, IR and UV-Visible spectra and conductivity measurements. Conductivity measurements have shown that all complexes are non-electrolytes.

Studies on mononuclear transition metal chelates derived from a novel ( E , E )-dioxime: synthesis, characterization and biological activity

A novel vic-dioxime ligand with a thiourea moiety, (4E,5E)-1,3-bis{4-[(4-bromophenylamino)methylene]phenyl}-2-thiooxaimidazoline-4,5-dione dioxime (4) (bmdH2) has been synthesized from N,N′-bis{4-[(4-bromophenylamino)methylene]phenyl}thiourea and (E,E)-dichloroglyoxime. The bmdH2 ligand (4) forms transition metal complexes [M(bmdH)2] with a metal : ligand ratio of 1 : 2 with M = Ni(II), Co(II), and Cu(II). The mononuclear Ni(II), Co(II) and Cu(II) complexes, [Ni(bmdH)2] (5), [Co(bmdH)2] (6) and [Cu(bmdH)2] (7) have the metal ions coordinated through the two N,N atoms, as do most vic-dioximes. Elemental analyses, molar conductivity, magnetic susceptibility, IR, 1H NMR spectra, and UV-Visible spectroscopy were used to elucidate the structures of the ligand and its complexes. Conductivity measurements have shown that the mononuclear complexes are non-electrolytes. In addition, the ligands and metal complexes were screened for antibacterial and antifungal activities by agar well diffusion techniques using DMF as solvent.

The d10 Metal Chelates Derived from Schiff Base Ligands Having Silane: Synthesis, Characterization, and Antimicrobial Studies of Cadmium(II) and Zinc(II) Complexes

The new Zn(II) and Cd(II) complexes were synthesized with the bidentate Schiff base ligands containing the silane group 4‐{[(3‐trimethoxysilanepropyl)imino]methyl}benzene‐2,4‐diol (L1H) and 4‐{[(3‐triethoxysilanepropyl)imino]methyl}benzene‐2,4‐diol (L2H), which were prepared by the reaction of 2,4‐dihydroxybenzaldehyde with 3‐aminopropyltrimethoxysilane and 3‐aminopropyltriethoxysilane respectively. The syntheses of ZnII and CdII chelates of these Schiff bases have been done by the precipitation technique. The synthesized metal complexes were further characterized by elemental analysis, molar conductance measurements, infrared spectra, and UV‐visible spectral data. Based on these characterizations, the metal complexes of ZnII and CdII may be formulated as [M(LI)2] or [M(L2)2] where M ˭ Zn, Cd. The ZnII and CdII metal complexes are formed by the coordination of N, O atoms of the ligands. The Molar conductance values of the ZnII and CdII complexes of the bidentate Schiff base ligands indicate their non‐ionic character. The antimicrobial properties of ZnII and CdII complexes against Klebsiella pneumoniae, Micrococcus luteus, Enterobacter cloacae, Bacillus megaterium, and Mycobacterium smegmatis and two fungi, namely Kluyveromyces marxianus and Rhodotorula rubra are reported. (1) [Cd(L1)2] and (2) [Zn(L2)2] metal chelates exhibited high activity against the Rhodotorula rubra.

SYNTHESIS AND COMPLEX FORMATION OF DI[4-(11-CHLORO-3,6,9-TRIOXAUNDECYLOXY) PHENYLAMINO]GLYOXIME

Di[4-(11-chloro-3,6,9-trioxaundecyloxy)phenylamino]glyoxime (LH2) has been prepared from 1-amino-4-(11-chloro-3,6,9-trioxaundecyloxy)benzene, anti-dichloroglyoxime, and sodium carbonate in ethanol. Nickel(II), copper(II) and cobalt(II) complexes of the ligand were synthesized. The Cu(II), Ni(II) and Co(II) complexes of the vic-dioxime ligand LH2 have a metal/ligand ratio of 1:2 and the ligand coordinates only through the N, N atoms, as do most vicinal dioximes. The structures of the ligand and its complexes were investigated by elementel analyses, magnetic susceptibility measurements, 1H NMR, IR and U.V.-Visible spectroscopy.

Single crystal X-ray structure and optical properties of anthraquinone-based dyes

This study focuses on the preparation, single crystal X-ray diffraction, characterization, and optical properties of some anthraquinone-based dyes. The anthraquinone-based antimicrobial dye N-{2-[(9,10-dioxo-9,10-dihydroanthracen-1-yl)amino]-2-oxoethyl}-N,N-dimethylbutan-1-aminium chloride monohydrate (III) was obtained from 1-aminoanthraquinone (I) via 2-chloro-N-(9,10-dioxo-9,10-dihydroanthracen-1-yl)acetamide (II) using known preparation and characterization methods. Single crystal X-ray diffraction analysis of III revealed a monoclinic system, space group P21/n, Z = 4. Photoluminescence properties of anthraquinone dyes I–III were also investigated. These dyes gave an intense emission (λmax = 341 nm) upon the irradiation by UV light and showed photoluminescence quantum yields of 73 %, 66 %, and 61 % with long excited-state lifetimes of 6.87 ns, 6.14 ns, and 5.69 ns, respectively. These anthraquinone dyes are of interest as an organic light emitting material for electroluminescent devices.