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West, Douglas X.; Salberg, Michelle M.; Bain, Gordon A.; Liberta, Anthony E.

doi:10.1023/a:1018431600844

Cited by 73 publications

(15 citation statements)

References 14 publications

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“…The investigated ligand has two bands at 32785 and 28570 cm )1 due to the p fi p* and n fi p* transitions, respectively [22]; changes in their energies are recorded in the complex spectra. Previous studies proved that the bands at 25,000-26,040 and 21,785-24,750 cm )1 should be assigned to O fi M [23] and S fi M [24] transitions. The band at 21,270-29,070 cm )1 (DMF) in the spectra of the present complexes may therefore be due to O fi M and S fi M CT.…”

Section: Electronic Spectra and Magnetic Studiesmentioning

confidence: 96%

Spectral, Magnetic, Electrical and Thermal Studies on Malonyl bis(thiosemicarbazide) Complexes

El-Metwally

Gabr

El‐Asmy

et al. 2006

Transition Met Chem

106

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Mono-and binuclear complexes of malonyl bis(thiosemicarbazide), H 4 MBT, with VO 2+ , Co 2+ , Ni 2+ , Cu 2+ , Cd 2+ and Pt 4+ have been isolated. The elemental analyses, magnetic moments, spectra [u.v.-vis., i.r., e.s.r. (for Cu 2+ ; VO 2+ ) and mass], thermal and voltammetric measurements [for Co 2+ and Ni 2+ ] have been used to characterize the isolated complexes. The ligand behaves as binegative quadridentate with Cu 2+ , Co 2+ and VO 2+ ions, binegative pentadentate with Pt 4+ and hexadentate, either as trinegative in [Cd 2 (HMBT)(OC 2 H 5 )(C 2 H 5 OH)]H 2 O or mononegative in [Ni 2 (H 3 MBT)(OAc) 3 (C 2 H 5 OH)]. The lack of thiol and/or enol hydrogen during the complex formation was confirmed pH-metrically. The pK's (10.70, 8.50 and 8.15) of H 4 MBT reveal the removal of CSNH protons in one step and CONH in two steps. Also, the stability constants reveal a higher value for the Cu 2+ complex and a lower one for VO 2+ . The TG analyses suggest high stability for most complexes followed by thermal decomposition in different steps. The kinetic and thermodynamic parameters for some decomposition steps in VO 2+ and Pt 4+ thermograms have been calculated.

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Section: Electronic Spectra and Magnetic Studiesmentioning

confidence: 96%

Spectral, Magnetic, Electrical and Thermal Studies on Malonyl bis(thiosemicarbazide) Complexes

El-Metwally

Gabr

El‐Asmy

et al. 2006

Transition Met Chem

106

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“…26 Bands in the 470-502 cm −1 region are assigned to ν (MN) vibrations, supporting the coordination of the ligands as tridentate NNS chelating agents. 23 The isolated dinuclear complexes (IV-V) show extra bands at 420 cm −1 which may be due to ν (MO) in these complexes and suggesting the coordination of the oxygen atoms. 27 Absorption due to the nitrato ligand in momonuclear copper (II) complex (III) were found at 1405 and 1311 cm .…”

Section: Resultsmentioning

confidence: 96%

Copper(II), Nickel(II) and Palladium(II) Complexes of 2-Oximino-3-thiosemicarbazone-2,3-butanedione

2004

Bulletin of the Korean Chemical Society

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A new tridentate ligand incorporating a monoxime and thiosemi-carbozone moieties has been synthesized. Its copper(II), nickel(II) and palladium(II) complexes have been prepared and characteirzed by physical and spectral methods. Elemental analyses and spectroscopic data of the metal complexes are consistent with the formation of a mononuclear copper(II) complex and binuclear complex with both nickel(II) and palladium(II). In the copper(II) complex the fourth coordination site is occupied by nitrate ion. In the binculear complexes the fourth coordination site is occupied by the deprotonated oxime oxygen of the ligand coordinated to the other metal.

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“…The spectra of the complexes show a band at 23.750-26.180 cm )1 due to LMCT [29]. Previous studies on thiosemicarbazone complexes proved that the band at 25,000-26,040 cm )1 should be assigned to O fi M transition [26] where that in the range 21,785-24,750 cm )1 is due to S fi M transition [30]. The CT band of the present complexes lies in the two ranges owing to the greater ability of Bi (III) to coordinate sulfur and oxygen compounds.…”

Section: Electronic Spectramentioning

confidence: 84%

“…The coordination via thione sulfur in complex (2) is indicated by the shift of m(C=S) and the appearance of a new band at 395 cm )1 due to m(Bi-S) [26]. In complex (4), the d(NH 2 ) band is shifted from 1620 to 1588 cm )1 confirming the chelation through the amino group.…”

Section: Infrared Spectral Studiesmentioning

confidence: 91%

Studies on bismuth(III) complexes of ligands containing nitrogen/sulfur and extractive procedure for determination of Bi(III)

Saad

El-Shahwai

Saleh

et al. 2007

Transition Met Chem

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The coordination behavior of thiosemicarbazide and its thiosemicarbazones towards Bi(III) is the main goal of this investigation. The structure of the isolated complexes has been proved by microanalysis, thermal, spectra (electronic, IR and ms) and voltammetric measurements. The ligands act as neutral or mononegative molecules and the coordination donors were found to be S for HTS; NN for HBTS; NS for HATS and H 2 STS and NNS or NSO for H 2 DMTS in the complexes. The complexes show thermal decomposition steps ending at 800°C with a stable fragment. The redox properties of the complexes toward oxidation waves are strongly dependent on =N thio substituents. At pH 1.5 and excess of iodide, Bi 3+ forms an orange-yellow [BiI 4 ] ) complex which associated with tricaprylylmethylammonium chloride (TCMAC) forming [TCMA] + [BiI 4 ] ) easily extracted into the CHCl 3 layer. The colored organic layer containing the ion pair is determined spectrophotometrically at 490 nm and represents the second goal.

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Untitled

Cited by 73 publications

References 14 publications

Spectral, Magnetic, Electrical and Thermal Studies on Malonyl bis(thiosemicarbazide) Complexes

Spectral, Magnetic, Electrical and Thermal Studies on Malonyl bis(thiosemicarbazide) Complexes

Copper(II), Nickel(II) and Palladium(II) Complexes of 2-Oximino-3-thiosemicarbazone-2,3-butanedione

Studies on bismuth(III) complexes of ligands containing nitrogen/sulfur and extractive procedure for determination of Bi(III)

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