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Volumn 112, Issue 10, 2008, Pages 3177-3183

DFT study of Co-C bond cleavage in the neutral and one-electron-reduced alkyl-cobalt(III) phthalocyanines

Author keywords

[No Author keywords available]

Indexed keywords

ALKYLATION; CHEMICAL BONDS; COBALT; COBALT COMPOUNDS; DISCRETE FOURIER TRANSFORMS; ELECTRONIC PROPERTIES; PROBABILITY DENSITY FUNCTION; TRANSITION METALS;

EID: 42449106934     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp0769678     Document Type: Article
Times cited : (29)

References (71)
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    • + species lack the intramolecular 5,6-dimethylbenzimidazole (DBI) ligand, which is axially attached to Co.
    • + species lack the intramolecular 5,6-dimethylbenzimidazole (DBI) ligand, which is axially attached to Co.
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    • Computational study in this direction has been carried out by Jensen and Ryde (ChemBioChem 2003, 4, 413-424) where DFT calculations have been used to compare various geometric, electronic, and functional properties of iron and cobalt porphyrin and corrin species.
    • Computational study in this direction has been carried out by Jensen and Ryde (ChemBioChem 2003, 4, 413-424) where DFT calculations have been used to compare various geometric, electronic, and functional properties of iron and cobalt porphyrin and corrin species.
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    • There are two main points of disagreement. First, Birke and Spataru (ref 20) criticized the applicability of DFT calculations to systems like the one-electron-reduced methylcobalamin on the grounds that their own DFT calculations (refs 6 and 7) did not show any change in the Co-C bond distance between the neutral complex and the radical anion. They attributed this to a failure of the conventional DFT method20 and applied CASSCF (without CASPT2) as a more appropriate theoretical method to describe the electronic and structural properties of the MeCbl anion radical. Second, they argued6 that the energy barrier for the Co-C bond breaking of ∼20 kcal/mol in the reduced MeCbl species, estimated at the BP86/6-31G(d) level of theory, is too high to account for the rapid kinetics observed.(22) A number of questions make it difficult to accept the detailed reductive cleavage mechanism proposed by Birke et al.6 In this mechanism, a quasi-equilibri
    • 9 for the reduced base-on MeCbl based on an assumption that the homolysis of the base-on reduced species is faster.
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    • The CASSCF calculations of Birke and Spataru (ref 20) do not reflect saturated active spaces, and consequently, their results are rather arbitrary; any addition of electrons or active orbitais changes results substantially.
    • The CASSCF calculations of Birke and Spataru (ref 20) do not reflect saturated active spaces, and consequently, their results are rather arbitrary; any addition of electrons or active orbitais changes results substantially.
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    • neutral.
    • neutral.
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    • The single-reference TDDFT method is not capable of providing any detailed description when the crossing of two electronic states takes place. One can expect the avoided crossing between the π*Pc and σCo-C states, but in reality, only an estimate can be obtained based on the energy interpolation. The analysis of the vertical excitations outside this range clearly points out which states should be connected, and therefore, the overall picture is not affected by such interpolation
    • The single-reference TDDFT method is not capable of providing any detailed description when the crossing of two electronic states takes place. One can expect the avoided crossing between the π*Pc and σCo-C states, but in reality, only an estimate can be obtained based on the energy interpolation. The analysis of the vertical excitations outside this range clearly points out which states should be connected, and therefore, the overall picture is not affected by such interpolation.
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    • •)-Me can be roughly estimated at 21 kcal/mol. Both values are 2-3 kcal/mol lower than the DFT computed BDEs.
    • •)-Me can be roughly estimated at 21 kcal/mol. Both values are 2-3 kcal/mol lower than the DFT computed BDEs.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.