Mono- and dinuclear copper(II) complexes of a Schiff base ligand, 4′,5′- bis(salicylideneimino)benzo-15-crown-5

Karaböcek, Serdar; Karaböcek, Nevin

doi:10.1016/s0277-5387(96)00504-9

Cited by 36 publications

(13 citation statements)

References 14 publications

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“…The trinuclear cobaloxime complexes (3)(4)(5)(6)(7)(8)(9)(10) are paramagnetic at 1.64-1.55 B.M., comparable to the expected spin-only value (1.73 μB) for one unpaired electron and confirming the formal +2 oxidation state of copper. Complexes 3-10 possess antiferromagnetic properties at room temperature by strong intramolecular antiferromagnetic spin exchange interaction as reported previously for the intramolecular metal complexes with dioximate bridges [27].…”

Section: Structure and Characterizationsupporting

confidence: 66%

The synthesis, characterization, and electrochemistry of molecular cobaloxime/organocobaloxime: catalysts for cycloaddition of carbon dioxide and epoxides

Kılıç

Ulusoy

Durgun

et al. 2014

Journal of Coordination Chemistry

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Section: Structure and Characterizationsupporting

confidence: 66%

The synthesis, characterization, and electrochemistry of molecular cobaloxime/organocobaloxime: catalysts for cycloaddition of carbon dioxide and epoxides

Kılıç

Ulusoy

Durgun

et al. 2014

Journal of Coordination Chemistry

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“…It is obvious that the metal complexes possess antiferromagnetic properties at room temperature by strong intramolecular antiferromagnetic spin exchange interaction as reported previously for trinuclear copper complexes with oximate bridge ligands. 27,33 Since the metal complexes (1) and (2) are diamagnetic, their NMR spectra could be obtained. The absorption bands observed for the electronic spectra of (1) and (2) metal complexes also support the square-planar geometry 34 (table 2).…”

Section: Magnetic Moments and Molar Conductivitymentioning

confidence: 99%

Synthesis, spectroscopic and redox properties of the mononuclear NiII, NiII(BPh2)2 containing (B-C) bond and trinuclear CuII-NiII-CuII type-metal complexes of N,N′-(4-amino-1-benzyl piperidine)-glyoxime

2009

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The novel vic-dioxime ligand containing the 4-amino-1-benzyl piperidine group, N,N′-(4amino-1-benzyl piperidine)-glyoxime, (LH 2 ) has been prepared from 4-amino-1-benzyl piperidine with anti-dichloroglyoxime at -15°C in absolute THF. Mononuclear Ni II metal complex has been obtained with 1 : 2 metal/ligand ratio. The Ni II complex of this ligand is proposed to be square planar geometry. IR spectra show that the ligand acts in a tetradentate manner and coordinates N 4 donor groups of LH 2 to Ni II ion. The detection of H-bonding (O-H⋅⋅⋅O) in the [Ni(LH) 2 ] (1) metal complex by IR spectra supported the square-planar MN 4 coordination of mononuclear complex. The disappereance of H-bonding (O-H⋅⋅⋅O) in the [Ni(L) 2 (BPh 2 ) 2 ] (2) complex shows that the BPh + 2 -capped groups (BPh + 2 cation formed BPh 4 anion) attaches to the main oxime core. MN 4 coordination of the [Ni(LH) 2 ] (1) and [Ni(L) 2 (BPh 2 ) 2 ] (2) metal complexes were also determined by 1 H-NMR spectroscopy. In the trinuclear Cu II -Ni II -Cu II metal complexes, the Ni II ion centered into the main oxime core by the coordination of the imino groups while the two Cu II ions coordinate dianionic oxygen donors of the oxime groups and linked to the ligands of 1,10-phenanthroline, 2,2′-bipyridine, and 4,4′-bipyridine. The ligand and their mono and trinuclear metal complexes were characterized by elemental analyses, FT-IR, UV-Vis, 1 H and 13 C-NMR spectra, magnetic susceptibility measurements, molar conductivity, cyclic voltammetry, mass spectra and X-ray powder techniques. The cyclic voltammetric results show that the cathodic peak potential of [Ni(L) 2 (BPh 2 ) 2 ] shifted toward more negative value compared to that of [Ni(LH) 2 ], probably due to a decreasing effect of back donation of metal-oxime moieties as a result of the BPh + 2 -bridged complex formation. Also, the formation of the trinuclear Cu II -Ni II -Cu II metal complexes caused considerable changes on the CV behaviour of mononuclear [Ni(LH) 2 ] (1) complex. The spectroelectrochemical study of [Ni(L) 2 (BPh 2 ) 2 ] (2) showed distinctive spectral changes that the intensity of the band (λ = at 364 nm, assigned to n → π* transitions) decreased and a new broad band in low intensity about 460 nm appeared as a result of the reduction of the nickel centered in the oxime core.

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“…The ligands (H 2 L and H 2 L 1 ) were verified by elemental analysis and 1 H-NMR, 13 C-NMR, and IR data (Table 1-3). In addition, its copper(II) and nickel(II) complexes were verified by elemental analyses and magnetic moment, UV-Vis and IR data (Tables 2-3).…”

Section: Resultsmentioning

confidence: 99%

“…The condensation of alkyl and aromatic primary amines with carbonyl groups yields Schiff bases (10)(11)(12)(13) that are still now regarded as one of the most potential group of chelators for facile preparations of metallo-organic hybrid materials. In the past two decades, the properties of Schiff base metal complexes stimulated much interest for their noteworthy contributions to single molecule-based magnetism, material science (14), catalysis of many reactions like carbonylation, hydroformylation, oxidation, reduction and epoxidation (15), etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural Studies of 2,2'-[(2E,5E)-hexane-2,5-diylidenedi-nitrilo]-dibenzenethiol and 2-Hydroxybenzaldehyde (2E,5E)-hexane-2,5-diylidenehydrazone ligands and their Mononuclear Cu(II) and Ni(II) Complexes

Karaböcek

Küçükdumlu

Ekmekcioglu

et al. 2009

J. of Macromolecular Sc., Part A

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Mono- and dinuclear copper(II) complexes of a Schiff base ligand, 4′,5′- bis(salicylideneimino)benzo-15-crown-5

Cited by 36 publications

References 14 publications

The synthesis, characterization, and electrochemistry of molecular cobaloxime/organocobaloxime: catalysts for cycloaddition of carbon dioxide and epoxides

The synthesis, characterization, and electrochemistry of molecular cobaloxime/organocobaloxime: catalysts for cycloaddition of carbon dioxide and epoxides

Synthesis, spectroscopic and redox properties of the mononuclear NiII, NiII(BPh2)2 containing (B-C) bond and trinuclear CuII-NiII-CuII type-metal complexes of N,N′-(4-amino-1-benzyl piperidine)-glyoxime

Synthesis and Structural Studies of 2,2'-[(2E,5E)-hexane-2,5-diylidenedi-nitrilo]-dibenzenethiol and 2-Hydroxybenzaldehyde (2E,5E)-hexane-2,5-diylidenehydrazone ligands and their Mononuclear Cu(II) and Ni(II) Complexes

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