Chromium(V) coordination chemistry

Mitewa, M.; Bontchev, P.R.

doi:10.1016/0010-8545(85)80006-0

Cited by 126 publications

(86 citation statements)

References 196 publications

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“…3) consistent with that ascribed to Cr VI oxy-esters (52,53). At pH 4.7, the redox reactions of the studied disaccharides proceed very slowly with negligible reduction of Cr VI within the first hour.…”

Section: Cr VI Oxidation Of Disaccharidessupporting

confidence: 85%

“…Each of these triplets shows four weak 53 Cr (9.55% abundance, I = 3/2) hyperfine peaks at 16.5(3) × 10 -4 cm -1 spacing (Fig. 4b, Table 2).…”

Section: Intermediacy Ofmentioning

confidence: 99%

“…An empirical relationship between the nature and number of donor groups and the EPR spectral parameters of Cr V complexes has been established (1,57). Five-coordinate Cr V species show higher g iso and lower 53 Cr A iso values than the corresponding six-coordinate species (57,59,60). Thus, the assignment of the structures of new oxo-Cr V species in solution was made according to the isotropic EPR parameters (g iso and A iso values) and the superhyperfine (shf) pattern of the signal (1,59).…”

Section: Intermediatesmentioning

confidence: 99%

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Kinetics and mechanism of the oxidation of disaccharides by Cr^VI

Roldán¹,

González²,

Santoro³

et al. 2002

Can. J. Chem.

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; à 33°C, les réactivités relatives des disaccharides vis-à-vis du Cr(VI) sont les suivantes: Mel > Lac > Cel > Mal. En milieu acide, il se forme du Cr(V) comme intermédiaire qui réagit avec le substrat plus rapidement que le Cr(VI). Les spectres de RPE montrent qu'il se forme des intermédiaires penta-et hexacoordinés d'oxo-Cr(V) dans lesquels le disaccharide agit comme ligand bidentate. Les espèces pentacoordinées oxo-Cr(V) sont présentes à toutes les [H + ] alors qu'on n'observe les espèces hexacoordinées qu'à des pH < 2 et que dans ces conditions elles se décomposent rapidement en produits d'oxydoréduction. À des pH allant de 3 à 7 où on n'observe pas de formation des espèces hexacoordinées d'oxo-Cr(V), les complexes de Cr(V) sont suffisamment stables pour être observés en solution pour des périodes allant de plusieurs jours à plusieurs mois.

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Section: Cr VI Oxidation Of Disaccharidessupporting

confidence: 85%

“…Each of these triplets shows four weak 53 Cr (9.55% abundance, I = 3/2) hyperfine peaks at 16.5(3) × 10 -4 cm -1 spacing (Fig. 4b, Table 2).…”

Section: Intermediacy Ofmentioning

confidence: 99%

Section: Intermediatesmentioning

confidence: 99%

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Kinetics and mechanism of the oxidation of disaccharides by Cr^VI

Roldán¹,

González²,

Santoro³

et al. 2002

Can. J. Chem.

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“…(1) is paramagnetic with an observed magnetic moment of 1.76 #e at 295 K, consistent with the d 1 configuration of pentavalent chromium. Roomtemperature EPR measurements for (1) gave g, = 1.975, corroborating this conclusion (Mitewa & Bontchev, 1985). On the other hand, (2) shows a feeble diamagnetic susceptibility, as expected in case of hexavalent chromium.…”

Section: (C6hs)4p] [Cro3(h20)] and [(C6hs)4p] [Cro3(oh)]supporting

confidence: 76%

Two mononuclear tetraphenylphosphonium oxochromium complexes: (PPh4)[CrVO3(H2O)] and (PPh4)[CrVIO3(OH)]

Mukherjee¹,

Mukhopadhaya²,

Mukherjee³

et al. 1994

Acta Crystallogr C

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“…72 In strongly acidic media, generally Cr(IV) remains as aqua complexes 73−76 and hence, in the present study the disproportionation of Cr(IV) follows Westheimer's mechanism (Eqs. 7 and 8).…”

mentioning

confidence: 68%

Spectral and Mechanistic Investigation of Oxidative Decarboxylation of Phenylsulfinylacetic Acid by Cr(VI)

Subramaniam¹,

Selvi²,

Devi³

2014

Journal of the Korean Chemical Society

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ABSTRACT. The oxidative decarboxylation of phenylsulfinylacetic acid (PSAA) by Cr(VI) in 20% acetonitrile − 80% water (v/v) medium follows overall second order kinetics, first order each with respect to [PSAA] The product of the reaction is found to be methyl phenyl sulfone. The operation of substituent effect shows that PSAA containing electron-releasing groups in the meta-and para-positions accelerate the reaction rate while electron withdrawing groups retard the rate. An excellent correlation is found to exist between log k2 and Hammett σ constants with a negative value of reaction constant. The ρ value decreases with increase in temperature evidencing the high reactivity and low selectivity in the case of substituted PSAAs.

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Chromium(V) coordination chemistry

Cited by 126 publications

References 196 publications

Kinetics and mechanism of the oxidation of disaccharides by Cr^VI

Kinetics and mechanism of the oxidation of disaccharides by Cr^VI

Two mononuclear tetraphenylphosphonium oxochromium complexes: (PPh4)[CrVO3(H2O)] and (PPh4)[CrVIO3(OH)]

Spectral and Mechanistic Investigation of Oxidative Decarboxylation of Phenylsulfinylacetic Acid by Cr(VI)

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Chromium(V) coordination chemistry

Cited by 126 publications

References 196 publications

Kinetics and mechanism of the oxidation of disaccharides by CrVI

Kinetics and mechanism of the oxidation of disaccharides by CrVI

Two mononuclear tetraphenylphosphonium oxochromium complexes: (PPh4)[CrVO3(H2O)] and (PPh4)[CrVIO3(OH)]

Spectral and Mechanistic Investigation of Oxidative Decarboxylation of Phenylsulfinylacetic Acid by Cr(VI)

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Kinetics and mechanism of the oxidation of disaccharides by Cr^VI

Kinetics and mechanism of the oxidation of disaccharides by Cr^VI