UV–Vis–NIR spectroscopy and colour of bis(N-phenylsalicylaldiminato)cobalt(II) in a variety of solvents

Kuźniarska‐Biernacka, Iwona; Bartecki, A.; Kurzak, Krzysztof

doi:10.1016/s0277-5387(03)00028-7

Cited by 33 publications

(13 citation statements)

References 45 publications

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“…No significant changes are observed for C parameter, that has values in the range 2000-2220 cm -1 . These results suggest that the inter-electronic repulsion parameters in cobalt(II) complex are independent on solvents used [7] and confirm that no solvent coordination takes place.…”

Section: Ligand-field Parameters and Chromaticity Coordinatessupporting

confidence: 59%

“…5). The [7]. In our study the hue angle values are very close together and equal 108° (Table 3), thus we decided to use the yellow index (Y.I.)…”

Section: Ligand-field Parameters and Chromaticity Coordinatesmentioning

confidence: 84%

“…The angular overlap parameters (AOM), i.e., separate values for e r and e p , cannot report as these a linearly related to Dq in T d symmetry [7] (10Dq = 3e r -4e p ). The matrix elements of the excited states (d 3 configuration) [17] were used for cobalt(II) complexes, assuming hole-formalism.…”

Section: Measurementsmentioning

confidence: 99%

“…We have been interested on the cobalt(II) complexes, with tetrahedral [6,7] as well as pseudo-octahedral [8] geometries, with Schiff bases derived from salicylaldehyde and amines in a variety of solvents. The main aim of this study is explanation of solvent effect.…”

Section: Introductionmentioning

confidence: 99%

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Solution properties and solvatochromism of bis(N-2-pyridyl-salicylaldiminato)cobalt(II)

2009

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The bis(N-2-pyridyl-salicylaldiminato)cobalt(II) complex ([Co(sap) 2 ]), a reddish-pink crystalline compound has been characterized by elemental analysis, molar conductivity, cyclic voltammetry, and Vis-NIR spectroscopy. Combination of all techniques indicates a tetrahedral geometry for the complex in solid state and in the solvents used. Electronic spectroscopy was used to determine the ligandfield parameters as well as chromaticity coordinates; for discrimination of color changes CIE and CIELAB color spaces have been applied.

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Section: Ligand-field Parameters and Chromaticity Coordinatessupporting

confidence: 59%

“…5). The [7]. In our study the hue angle values are very close together and equal 108° (Table 3), thus we decided to use the yellow index (Y.I.)…”

Section: Ligand-field Parameters and Chromaticity Coordinatesmentioning

confidence: 84%

Section: Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solution properties and solvatochromism of bis(N-2-pyridyl-salicylaldiminato)cobalt(II)

2009

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“…), even though its wide use, solvatochromism (a color change as a result of solvent effect) still remains a largely unknown phenomenon due to the enormously complex coupling of many different interactions and dynamical processes which describe it. Metal-chelates with O 2 N 2 as Schiff-base or mixed ligands have been studied as solvatochromic indicators [1][2][3][4][5]. In view of the limited information available regarding the spectroscopic properties of mixed ligand metal complexes containing 5.5-dimethyl cyclohexane1,3-dione (HDMCHD) the present study which is a continuation of our studies on chromotropic of the metal chelates with mixed ligands containing O-O and N-N in various solvents [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 98%

Spectral, Electrochemical and Molecular Orbital Studies on a New Solvatochromic Binuclear Mixed Ligand Copper(II) Complexes

HM¹

2015

Mod Chem Appl

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A new series of solvatochromic binuclear mixed ligand complexes with the general formula: Cu2(DMCHD)(Am)2X3 (where, DMCHD: 5.5-Dimethyl cyclohexanate 1, Am=N,N, N,N,N', or N,N,N',N', and X=ClO4-or Clhave been synthesized and characterized by the analytical, spectral methods, magnetic and molar conductance as well as electrochemical measurements. The formation constant values for HDMCHD ligand with various metal ions are much lower than expected for similar β-diketones revealing a monobasic unidentate nature of this ligand. The d-d absorption bands of the prepared complexes in weak donor solvents suggest square-planar, distorted octahedral and/ or distorted trigonal bipyramid geometries for the perchlorate and chloride of diamine in addition to triamine complexes, respectively. However, an octahedral structure was identified for the complexes in strong donor solvents. Perchlorate of diamine complexes show a remarkable color change from violet to green as the Lewis basicity of the donor solvent or anions increases, whereas chloride complex is mainly affected by the Lewis acidity of the acceptor solvent. Specific and non-specific interactions of solvent molecules with the complexes have been investigated using the unified solvation model. Band's oscillator strength of the d-d transition has been calculated and discussed. Cyclic voltammetric measurements on the prepared complexes in different solvents showed a quasi-reversible or irreversible and mainly diffusion controlled reduction process. Such behavior has been explained according to the EECE mechanism. A linear correlation has been found between the Cu(II) reduction potential and the spectral data. Structural parameters of the free ligands and their Cu(II)-complexes have been calculated on the basis of semiemperical PM3 level and correlated with the experimental data.

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Synthesis, structural characterization, antimicrobial, antioxidant and DNA binding studies of some novel homo‐binuclear Schiff base metal (II) complexes

Aziz

Shawky

Khalil

2018

Applied Organom Chemis

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A novel bi‐nucleating Schiff base ligand, 6,6′‐(((1E,1′E)‐thiophene‐2,5‐diylbis (methaneylylidene))bis (azaneylylidene))bis (3,4‐dimethylaniline), and five binuclear M (II) complexes were synthesized. The bi‐nucleating Schiff base ligand and its metal complexes were characterized using various physicochemical techniques, e.g. elemental analyses, spectroscopic methods, conductivity and magnetic moment measurements. The low molar conductance of the complexes in dimethylsulfoxide shows their non‐electrolytic nature. The antibacterial activities were screened against pathogenic bacteria (Staphylococcus aureus, Escherichia coli, Pseudomonas putida and Bacillus subtilis). The antifungal activity was screened against Aspergillus niger, Aspergillus flavus and Rhizoctonia bataicola. The antimicrobial activity data showed that the metal complexes are more potent than the parent Schiff base ligand against microorganisms. The antioxidant activities of the synthesized compounds were investigated through scavenging activity against 2,2‐diphenyl‐2‐picrylhydrazyl, superoxide anion, hydroxyl and 2,2′‐azinobis (3‐ethylbenzothiazoline‐6‐sulfonic acid) radicals. The complexes have superior radical scavenging activity than the free ligand and the scavenging effects of the Cu (II) complex are stronger than those of the other complexes. DNA binding studies were performed using electronic spectroscopy, fluorometric competition studies and viscosity measurements. The data indicated that there is a marked enhancement in biocidal activity of the ligand under similar experimental conditions because of coordination with metal ions.

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UV–Vis–NIR spectroscopy and colour of bis(N-phenylsalicylaldiminato)cobalt(II) in a variety of solvents

Cited by 33 publications

References 45 publications

Solution properties and solvatochromism of bis(N-2-pyridyl-salicylaldiminato)cobalt(II)

Solution properties and solvatochromism of bis(N-2-pyridyl-salicylaldiminato)cobalt(II)

Spectral, Electrochemical and Molecular Orbital Studies on a New Solvatochromic Binuclear Mixed Ligand Copper(II) Complexes

Synthesis, structural characterization, antimicrobial, antioxidant and DNA binding studies of some novel homo‐binuclear Schiff base metal (II) complexes

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