Electrochemical and spectroscopic studies of arylazo-2-naphthol metal complexes in dimethylformamide solution

Loutfy, Rafik O.; Sharp, J. H.

doi:10.1021/ja00454a025

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…The spectrum at 50 ps delay time was almost identical; only the stimulated emission band was slightly broadened to the long wavelength side and the induced absorption of the rx-chloronaphthalene was absent. (2), after heating up to 80°C and cooling down to room temperature (1), and after storage for two months (3). (b) The ratio of the spectra (1) and (2).…”

Section: Methodsmentioning

confidence: 99%

“…(2), after heating up to 80°C and cooling down to room temperature (1), and after storage for two months (3). (b) The ratio of the spectra (1) and (2). a orescence of other solutions was too weak to be distinguished from luminescence of unavoidable impurities and the fluorimeter noise.…”

Section: Methodsmentioning

confidence: 99%

“…The photoconducting and related properties of organic azo materials have therefore received growing attention. 1 Photoconductivity of azo compounds was reported as early as 1969 by Rau,2 who observed strong photostimulated surface conductance with thin layers of l-phenylazo-2naphthol. Several years later, Champ and Shattuck 3 reported the use of the bisazo pigment Chlorodiane Blue as a photogenerating material in electrophotographic devices.…”

Section: Introductionmentioning

confidence: 99%

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Picosecond Spectroscopic Studies of Tautomers of a Bisazo Compound in Solutions

Karpicz

Gulbinas

Undzenas

2000

J Chinese Chemical Soc

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Spectroscopic properties of a fluorenone-based bisazo compound in different organic solvents have been investigated by means of the steady -state absorption and fluorescence spectroscopy and picosecond timeresolved absorption pump-probe spectroscopy. The spectra of the molecules have been shown to be mainly determined by the excitations localized on individual chromophores -azo fragments. Spectra of the azo-enol and hydrazone-quinone tautomeric forms were distinguished. Excited states of the two forms were found to relax in different ways. The hydrazone-quinone form relaxes predominantly nonradiatively with the 400 ps time constant in rx-chloronaphthalene, resulting in the fluorescence quantum yield of the order of 10-2. The azo-enol form relaxes via two competing ways, directly to the ground state with the time constant of the order of tens of picoseconds, or via the long-lived intermediate state.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Picosecond Spectroscopic Studies of Tautomers of a Bisazo Compound in Solutions

Karpicz

Gulbinas

Undzenas

2000

J Chinese Chemical Soc

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“…It is also well documented that the second reduction is followed by a very fast irreversible chemical reaction [29,30]. Here, both the one-electron reduction steps are believed to occur primarily at the azo function of palladated arylazonaphthalenes, followed by very fast decomposition of the reduced species [31].…”

Section: Redox Propertiesmentioning

confidence: 98%

β-Diketonates of Cyclopalladated Arylazonaphthalenes: Synthesis, Characterization and Redox Activity

Bhawmick

Das

Acharya

et al. 2006

Transition Met Chem

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The synthesis of monomeric mixed species of the type [PdLK] (L = cyclopalladated arylazonaphthalenes) have been achieved by splitting the halogeno-bridge in [Pd 2 L 2 Cl 2 ] by b-diketones (HK). The compounds have been characterized on the basis of spectral (IR, UV-VIS, FAB mass, 1 H and 13 C{ 1 H}NMR) and elemental analysis data. Some of the [PdLK] cyclometallates occur as isomeric mixtures whose composition have been established by 1 H-NMR data. Electron transfer properties of the cyclopalladates in DMF have been thoroughly examined using cyclic voltammetry.

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“…PR 57:1 has been reported that it has a crystalline structure and anisotropic growth features in the complex form [10][11][12][13][14][15][16][17] , but there have been no studies on their morphological changes by the milling and resulting color changes.…”

Section: Introductionmentioning

confidence: 99%

Particle Size, Morphology and Color Characteristics of C.I. Pigment Red 57:1 : 2. Effect of Salt Milling Process

Seo¹,

Lee²,

Yoo³

2015

Textile Coloration and Finishing

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The effect of salt milling process on the crystal size, morphology, and color characteristics of C.I.Pigment Red 57:1 was studied. The primitive morphology and color properties of the pigment after synthesis were studied in the former series work. The size and morphology of primary particles and the second aggregation features should be considered because they are very important to determine pigment quality. We compared the primary morphology of pigment particles before drying with the secondary aggregated morphology of pigment particles after drying and salt milling process. Morphological properties were investigated by particle size analysis, X-ray diffraction, and scanning electron microscopy and color measurement was carried out. Significant reduction in particle size as well as enhanced crystallite size after salt milling process was observed. This result might give a difference in color of the pigment, turning into brighter and more blue-toned red color. It was revealed that synthesis condition affect the morphology and color of the pigment even after milling. Increase in HCl concentration in the synthesis process enhanced crystal size and quality forming bluer-red pigments but an increase in CaCl2 concentration resulted in more amorphous crystals forming darker-red pigments after salt milling.

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Electrochemical and spectroscopic studies of arylazo-2-naphthol metal complexes in dimethylformamide solution

Cited by 13 publications

References 13 publications

Picosecond Spectroscopic Studies of Tautomers of a Bisazo Compound in Solutions

Picosecond Spectroscopic Studies of Tautomers of a Bisazo Compound in Solutions

β-Diketonates of Cyclopalladated Arylazonaphthalenes: Synthesis, Characterization and Redox Activity

Particle Size, Morphology and Color Characteristics of C.I. Pigment Red 57:1 : 2. Effect of Salt Milling Process

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