1972
DOI: 10.1351/pac197230030335
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The effect of the nature of ligands on the reactivity of the metal-carbon bond in cobalt chelates

Abstract: After a short account of the model approach to the coordination chemistry of Vitamin B 12 • previous evidence concerning the influence of organic groups as axial ligands on ground state properties and reactivity of several series of cobalt chelates with tetradentate equatorial macrocycles is summarized. The recent results dealing with the influence of the nature of the equatorial chelating agent on ground state properties of the molecule and on coordination chemistry and reactivity at the axial positions are c… Show more

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Cited by 55 publications
(10 citation statements)
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“…B+ + 02" (12) The reactions which make up the Hess' law cycle and their AG values are as follows: CoTPP • B • 02 3=! Co"TPP • B + 02 AG =+0.8 kcal/mol (13) ConTPP • B + B CouTPP • B2 AG +1.3 kcal/mol (14) Co"TPP • B2 ^CoIUTPP • B2+ + e AG = -7.7 kcal/mol (15) Co'"TPP • B2+ ComTPP • B+ + B AG sí +2.7 to 4.0 kcal/mol (16) 02 + e~0 2~A G = +18.9-24.0 kcal/mol (17) Journal of the American Chemical Society / 98:12 / June s Solvent = butyronitrile.…”
Section: Resultsmentioning
confidence: 99%
“…B+ + 02" (12) The reactions which make up the Hess' law cycle and their AG values are as follows: CoTPP • B • 02 3=! Co"TPP • B + 02 AG =+0.8 kcal/mol (13) ConTPP • B + B CouTPP • B2 AG +1.3 kcal/mol (14) Co"TPP • B2 ^CoIUTPP • B2+ + e AG = -7.7 kcal/mol (15) Co'"TPP • B2+ ComTPP • B+ + B AG sí +2.7 to 4.0 kcal/mol (16) 02 + e~0 2~A G = +18.9-24.0 kcal/mol (17) Journal of the American Chemical Society / 98:12 / June s Solvent = butyronitrile.…”
Section: Resultsmentioning
confidence: 99%
“…The inherently weak CoÀC bond in the organocobaloximes undergoes homolytic cleavage with visible light, similar to the þ0.0314 (11) þ0.0530 (8) þ0.0431 (7) þ0.0479 (9) p•••p (Å) 3.525 (1) 3.5204(9) 2 The torsion angle (s) is the angle between two virtual planes that bisect cobaloxime plane. This shows dihedral angle between the plane of pyridine and the plane bisecting the CeC bond of two dioxime units through the cobalt atom.…”
Section: Reactivity Studiesmentioning
confidence: 94%
“…The studies have helped to understand the chemistry and biochemistry of B 12 coenzymes [4e6]. The influence of equatorial ligands (cis influence) in the Schiff base compounds like Co(saloph)R (saloph ¼ dianion of disalicylidene-ophenylenediamine) [7,8], LCo(acacen)R [acacen ¼ dianion of ethylenebis(acetylacetone imine)] [1], LCo(salen)R [salen ¼ dianion of N,N 0 -ethylenebis(salicylideneamine)] [9] and Costa's model [10,11] such as [LCo{(DO)(DOH)pn}R]X [(DO)(DOH)pn, N 2 ,N 2 0 -propanediylbis(2,3-butanedione-2-imine-3-oxime)] has also been reported.…”
Section: Introductionmentioning
confidence: 99%
“…Many organocobalt(III) complexes with a stable σ Co−C bond have been synthesized and investigated. Their unusual physico-chemical and structural properties are of considerable interest in B 12 chemistry . The alkylcobalt(III) Schiff base complexes are one of important kind of coenzyme B 12 models.…”
Section: Introductionmentioning
confidence: 99%