Cobalt(II), nickel(II), copper(II), thorium(IV) and uranium(VI) complexes of some heterocyclic Schiff bases derived from hydroxy aromatic aldehydes and 2-aminopyridine

Mahmoud, M. R.; El-Haty, M. T.

doi:10.1016/0022-1902(80)80005-4

Cited by 62 publications

(14 citation statements)

References 6 publications

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“…The tentative assignment of the important bands of the Schiff base under investigation and their corresponding metal complexes are recorded in Table II. The broad band that appeared in the IR spectrum of L 2 H 2 at 2650-3000 cm À1 is characteristic for the stretching vibration of the intermolecular hydrogen-bonded -OH in the molecule [16]. This is probably caused by the formation of intermolecular hydrogen bonds in the L 2 H 2 ligand as the distance between the m-positioned atoms is shorter than that of the p-positioned atoms.…”

Section: Resultsmentioning

confidence: 96%

Synthesis, spectral characterization and electrochemical studies of copper(II) and cobalt(II) complexes with novel tetradentate salicylaldimines

Taş

Aslanoğlu

Ulusoy

et al. 2004

Journal of Coordination Chemistry

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Several new complexes of Schiff bases obtained by the condensation of 1,2-bis( p-aminophenoxy)ethane and 1,2-bis(m-aminophenoxy)ethane with 3,5-di-tert-butyl-2-hydroxybenzaldehyde have been synthesized, and characterized by elemental analyses, FT-IR, UV-VIS, 1 H NMR spectroscopy, magnetic susceptibility measurements and cyclic voltammetry. The metal to ligand ratios of the Co(II) and Cu(II) complexes were found to be 1 : 1. The coordination of the Schiff base appears to occur through the two azomethine nitrogens and two o-OH groups. Electrochemical data suggest the existence of copper(II)/copper(I) and cobalt(II)/cobalt(I) redox couples in DMSO along with an irreversible oxidation peak assigned to the oxidation of ligands for all of the complexes.

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Section: Resultsmentioning

confidence: 96%

Synthesis, spectral characterization and electrochemical studies of copper(II) and cobalt(II) complexes with novel tetradentate salicylaldimines

Taş

Aslanoğlu

Ulusoy

et al. 2004

Journal of Coordination Chemistry

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“…One of the strategies used in designing useful ligands to produce polynuclear complexes relies on creating a mismatch between the number and/or type of coordination sites available on a single metal site and the donor site provided by the ligands. In this point of view, 2-[(pyridine-2-ylimine)methyl]phenol (Hpymp, Scheme 1) [27], where the number and disposition of the donor atoms on the ligand, makes it possible for different donor atoms to bind to the different metal sites, and this mismatch creates a chance to build polynuclear metal supramolecules. With this mismatch in mind, we carried out reactions involving nickel nitrate and Hpymp and nickel chloride and Hpymp.…”

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confidence: 99%

Trinuclear and mononuclear nickel(II) complexes incorporating tridentate 2-[(pyridine-2-ylimine)methyl]phenol ligand: Syntheses, crystal structures and magnetic properties

Ran

Zhang

et al. 2008

Inorganic Chemistry Communications

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“…The mononuclear complex (5), shows three new bands at 3155, 1609 and 992 cm 21 , the second band is assigned to skeletal vibrations of the pyridine ring, indicating that the nitrogen atom of the pyridine ring does not participate in coordination [24,25] while the third band is due to the pyridine ring breathing mode. The first band is due to the coordinated NH 2 group of 2-aminopyridine.…”

Section: Ir Spectramentioning

confidence: 99%

Synthesis and Characterization of Some New Oxorhenium(V) Complexes with Annulene Derivatives and Their Biological Activities

Mashaly

2004

Synthesis and Reactivity in Inorganic and Metal-Organic Chemist

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Mononuclear and binuclear oxorhenium(V) complexes were prepared from the reaction of 8, 17-dimethyl-5,7,14,16-tetrahydrodibenzo[a,h] annulene-6,15-dione (H 2 N 4 L) with the oxorhenium(V) complex H 2 [ReOCl 5 ] in 6 M HCl solution. The composition of the prepared complexes depends on the concentration of hydrochloric acid in which the starting rhenium(V) complex is dissolved. The mononuclear oxorhenium(V) complex, [ReO(H 2 N 4 L)(H 2 O)]Cl 3 , was obtained in 6 M HCl solution, while the binuclear complex, [Re 2 O 3 (H 2 N 4 L) 2 ]Cl 4 . 2H 2 O, was obtained in 2 M HCl solution. The reaction of H 2 N 4 L mixed with PPh 3 , NaSCN or 2-aminopyridine, with the starting oxorhenium(V) ORDER REPRINTS complex in 6 M HCl solution, yielded the mononuclear complexes, [ReO(H 2 N 4 L)(PPh 3 )]Cl 3 . H 2 O, [ReO(H 2 N 4 L)(SCN)]Cl 2 . 1 2 H 2 O and [ReO(H 2 N 4 L)(C 5 H 6 N 2 )]Cl 3 , respectively. The reaction of NH 3 gas with the isolated solid complex, [ReO(H 2 N 4 L)(H 2 O)]Cl 3 , yielded a binuclear oxorhenium(V) complex, [Re 2 O 3 (H 2 N 4 L) 2 ]Cl 4 . These complexes decompose through several isolable, as well as non-isolable, intermediates during heating. [Re 2 O 3 (N 4 L)]Cl 4 , [ReO(N 4 L)Cl], [ReO(N 4 L)(PPh 3 )]Cl, [ReO(N 4 L)(SCN)] and [ReO(N 4 L)(C 5 H 6 N 2 )]Cl, were synthesized pyrolytically in the solid state from the corresponding rhenium complexes. The electronic absorption spectra and magnetic moments indicate an octahedral configuration for the complexes. The macrocyclic ligand in these complexes behaves either as neutral tetradentate or dianionic tetradentate towards the oxorhenium ions. The structures of all complexes and the corresponding thermal products were elucidated by elemental analyses, conductance, IR and electronic absorption spectra, magnetic moments, 1 H NMR and TG-DSC measurements as well as by mass spectroscopy.

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Cobalt(II), nickel(II), copper(II), thorium(IV) and uranium(VI) complexes of some heterocyclic Schiff bases derived from hydroxy aromatic aldehydes and 2-aminopyridine

Cited by 62 publications

References 6 publications

Synthesis, spectral characterization and electrochemical studies of copper(II) and cobalt(II) complexes with novel tetradentate salicylaldimines

Synthesis, spectral characterization and electrochemical studies of copper(II) and cobalt(II) complexes with novel tetradentate salicylaldimines

Trinuclear and mononuclear nickel(II) complexes incorporating tridentate 2-[(pyridine-2-ylimine)methyl]phenol ligand: Syntheses, crystal structures and magnetic properties

Synthesis and Characterization of Some New Oxorhenium(V) Complexes with Annulene Derivatives and Their Biological Activities

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