On the chemical properties of the transient complexes L(m)M(n+1) - OOR Part I. The case of (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H2O )Co(III)- OOCH32+

Ela Solomon-Rapaport; Alexandra Masarwa; Haim Cohen; Dan Meyerstein

doi:10.1016/S0020-1693(99)00461-2

On the chemical properties of the transient complexes L(m)M(n+1) - OOR Part I. The case of (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H₂O )Co(III)- OOCH₃²⁺

Ela Solomon-Rapaport, Alexandra Masarwa, Haim Cohen, Dan Meyerstein

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

The transient complex (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H₂O )Co(111)-OOCH₃²⁺, (tim)(H₂O)Co(III)-O₂CH₃²⁺, was prepared via the reaction of Co(11)(tim)(H₂O)₂²⁺ with methylperoxyl radicals, applying radiation chemistry techniques. The transient complex decomposes mainly via a 'Fenton-like' reaction with excess Co(II)(tim)(H₂O)₂²⁺, k= 16 ± 1 M^-1 s^-1. The transient complex reacts with the CH₃O₂ radicals, k=(1.4 ± 0.3) x 10⁹ M^-1 s^-1 to form Co(11)(tim)(H₂O)₂²⁺ and formaldehyde. This reaction is surprisingly fast and if this rate is typical for analogous reactions these reactions have to be considered in a variety of radical induced oxidation processes. The plausible role of analogous reactions in oxidation processes by peroxides and dioxygen, which are catalyzed by cobalt complexes, is discussed. (C) 2000 Elsevier Science S.A.

Original language	English
Pages (from-to)	41-46
Number of pages	6
Journal	Inorganica Chimica Acta
Volume	299
Issue number	1
DOIs	https://doi.org/10.1016/S0020-1693(99)00461-2
State	Published - 28 Feb 2000
Externally published	Yes

Bibliographical note

Funding Information:
This study was supported in part by a grant from the Budgeting and Planning Committee of The Council of Higher Education and the Israel Atomic Energy Commission. D.M. wishes to express his thanks to Irene Evens for her ongoing interest and support.

Keywords

Cobalt complexes
Peroxyl radicals
Radiation chemistry

Access to Document

10.1016/S0020-1693(99)00461-2

Cite this

@article{a3c159c12ebe4be9a81b823418e04f12,

title = "On the chemical properties of the transient complexes L(m)M(n+1) - OOR Part I. The case of (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H2O )Co(III)- OOCH32+",

abstract = "The transient complex (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H2O )Co(111)-OOCH32+, (tim)(H2O)Co(III)-O2CH32+, was prepared via the reaction of Co(11)(tim)(H2O)22+ with methylperoxyl radicals, applying radiation chemistry techniques. The transient complex decomposes mainly via a 'Fenton-like' reaction with excess Co(II)(tim)(H2O)22+, k= 16 ± 1 M-1 s-1. The transient complex reacts with the CH3O2 radicals, k=(1.4 ± 0.3) x 109 M-1 s-1 to form Co(11)(tim)(H2O)22+ and formaldehyde. This reaction is surprisingly fast and if this rate is typical for analogous reactions these reactions have to be considered in a variety of radical induced oxidation processes. The plausible role of analogous reactions in oxidation processes by peroxides and dioxygen, which are catalyzed by cobalt complexes, is discussed. (C) 2000 Elsevier Science S.A.",

keywords = "Cobalt complexes, Peroxyl radicals, Radiation chemistry",

author = "Ela Solomon-Rapaport and Alexandra Masarwa and Haim Cohen and Dan Meyerstein",

note = "Funding Information: This study was supported in part by a grant from the Budgeting and Planning Committee of The Council of Higher Education and the Israel Atomic Energy Commission. D.M. wishes to express his thanks to Irene Evens for her ongoing interest and support. ",

year = "2000",

month = feb,

day = "28",

doi = "10.1016/S0020-1693(99)00461-2",

language = "אנגלית",

volume = "299",

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journal = "Inorganica Chimica Acta",

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On the chemical properties of the transient complexes L(m)M(n+1) - OOR Part I. The case of (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H₂O )Co(III)- OOCH₃²⁺. / Solomon-Rapaport, Ela; Masarwa, Alexandra; Cohen, Haim et al.
In: Inorganica Chimica Acta, Vol. 299, No. 1, 28.02.2000, p. 41-46.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - On the chemical properties of the transient complexes L(m)M(n+1) - OOR Part I. The case of (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H2O )Co(III)- OOCH32+

AU - Solomon-Rapaport, Ela

AU - Masarwa, Alexandra

AU - Cohen, Haim

AU - Meyerstein, Dan

N1 - Funding Information: This study was supported in part by a grant from the Budgeting and Planning Committee of The Council of Higher Education and the Israel Atomic Energy Commission. D.M. wishes to express his thanks to Irene Evens for her ongoing interest and support.

PY - 2000/2/28

Y1 - 2000/2/28

N2 - The transient complex (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H2O )Co(111)-OOCH32+, (tim)(H2O)Co(III)-O2CH32+, was prepared via the reaction of Co(11)(tim)(H2O)22+ with methylperoxyl radicals, applying radiation chemistry techniques. The transient complex decomposes mainly via a 'Fenton-like' reaction with excess Co(II)(tim)(H2O)22+, k= 16 ± 1 M-1 s-1. The transient complex reacts with the CH3O2 radicals, k=(1.4 ± 0.3) x 109 M-1 s-1 to form Co(11)(tim)(H2O)22+ and formaldehyde. This reaction is surprisingly fast and if this rate is typical for analogous reactions these reactions have to be considered in a variety of radical induced oxidation processes. The plausible role of analogous reactions in oxidation processes by peroxides and dioxygen, which are catalyzed by cobalt complexes, is discussed. (C) 2000 Elsevier Science S.A.

AB - The transient complex (2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)(H2O )Co(111)-OOCH32+, (tim)(H2O)Co(III)-O2CH32+, was prepared via the reaction of Co(11)(tim)(H2O)22+ with methylperoxyl radicals, applying radiation chemistry techniques. The transient complex decomposes mainly via a 'Fenton-like' reaction with excess Co(II)(tim)(H2O)22+, k= 16 ± 1 M-1 s-1. The transient complex reacts with the CH3O2 radicals, k=(1.4 ± 0.3) x 109 M-1 s-1 to form Co(11)(tim)(H2O)22+ and formaldehyde. This reaction is surprisingly fast and if this rate is typical for analogous reactions these reactions have to be considered in a variety of radical induced oxidation processes. The plausible role of analogous reactions in oxidation processes by peroxides and dioxygen, which are catalyzed by cobalt complexes, is discussed. (C) 2000 Elsevier Science S.A.

KW - Cobalt complexes

KW - Peroxyl radicals

KW - Radiation chemistry

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