TRACE METAL-ION CATALYSIS - KINETICS AND MECHANISM OF OXIDATION OF L-ASCORBIC-ACID BY CHROMIUM(VI) IN PHOSPHATE BUFFERS

被引：9

作者：

AGRAWAL, A ^{[1
]}

RAO, I ^{[1
]}

SHARMA, PD ^{[1
]}

机构：

[1] UNIV RAJASTHAN,DEPT CHEM,JAIPUR 302004,RAJASTHAN,INDIA

来源：

TRANSITION METAL CHEMISTRY | 1993年 / 18卷 / 02期

关键词：

D O I：

10.1007/BF00139955

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The kinetics of oxidation of l-ascorbic acid (H2A) by Cr(VI) with and without added Cu(II) conforms to the stoichiometry represented by the equation: 2Cr(VI) + 3H-2A --> 2Cr(III) + 3A + 6H+ where A is dehydroascorbic acid. The mode of the electron transfer from H-2A to Cr(VI) is suggested to involve oxidative decomposition of an intermediate complex. Catalysis by Cu(II) is indicated via complexation of the catalyst and substrate. The inhibitory effects of Cl-, NO3- and SO42- ions indirectly support complexation between Cr(VI) and H-2A.

引用

页码：191 / 196

页数：6

共 32 条

[1]

AGRAWAL A, 1991, TOPICS CHEM SERIES, P315

[2] KINETICS AND MECHANISM OF THE REACTIONS OF MONONUCLEAR AND BINUCLEAR RUTHENIUM(III) AMMINE COMPLEXES WITH ASCORBIC-ACID [J].

AKHTAR, MJ ;

HAIM, A .

INORGANIC CHEMISTRY, 1988, 27 (09) :1608-1610

[3]

BEATTIE JK, 1972, INORGANIC REACTION 2, P98

[4] THE COMPLEXITIES OF ASCORBATE AS A REDUCING AGENT [J].

CREUTZ, C .

INORGANIC CHEMISTRY, 1981, 20 (12) :4449-4452

[5] CHROMIUM, MOLYBDENUM, AND TUNGSTEN - THERMODYNAMIC PROPERTIES, CHEMICAL-EQUILIBRIA, AND STANDARD POTENTIALS [J].

DELLIEN, I ;

HALL, FM ;

HEPLER, LG .

CHEMICAL REVIEWS, 1976, 76 (03) :283-310

[6]

Feigl F., 1966, SPOT TESTS ORGANIC A, V7th

[7] KINETICS AND MECHANISM OF CHROMIUM (6)-IODIDE REACTION [J].

GASWICK, DC ;

KRUEGER, JH .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1969, 91 (09) :2240-&

[8] ELECTRON-TRANSFER .98. COPPER(II) AND VANADIUM(IV) CATALYSIS OF THE REDUCTION OF PEROXIDE-BOUND CHROMIUM(IV) WITH ASCORBIC-ACID [J].

GHOSH, SK ;

GOULD, ES .

INORGANIC CHEMISTRY, 1989, 28 (10) :1948-1951

[9] ELECTRON-TRANSFER .96. CATALYZED REDUCTION OF PEROXIDE-BOUND CHROMIUM(IV) WITH HYDROXYLAMINE [J].

GHOSH, SK ;

GOULD, ES .

INORGANIC CHEMISTRY, 1988, 27 (23) :4228-4231

[10]

GHOSH SK, 1988, INORG CHEM, V27, P4294

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