Studiul teoretic al descompunerii peroxidului de hidrogen cu complecşi dinucleari ai manganului [Articol]
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Universitatea de Stat din Moldova
Abstract
Complecşii dinucleari ai manganului cu L=N,N'-bis(2-piridilmetil)-etilamina manifestă o activitate catalitică ridicată în procesul de descompunere a peroxidului de hidrogen, care decurge în două etape. În această lucrare sunt prezentate datele studiului efectuat în baza Teoriei Funcţionalei de Densitate (TFD), la valori diferite ale spinului total, pe doi complecşi, [(L)2(Mn(III))2(CH3CO2)2(OH)2]2 şi [(L)2(Mn(IV))2(CH3CO2)2(O)2]2 , implicaţi în etapele (I) şi (II). Din calcule rezultă că ambele sisteme electronice cu spin înalt au cea mai mică energie. Câştigul general de energie calculat în aceste procese este de -46,56 kcal/mol, fapt ce confirmă caracterul realizabil al acestei reacţii.
Dinuclear manganese based enzymes engage in processes as diverse as hydrogen peroxide disproportionation and α-amino acidhydrolysis. N,N’-bis(2-pyridylmethyl)-ethylamine dimanganese complexes manifest a high catalytic activity in the hydrogen peroxide decomposition in two stages. In this work the results of DFT calculations on two complexes, [(L)2(Mn(III))2(CH3CO2)2(OH)2]2 and [(L)2(Mn(IV))2(CH3CO2)2(O)2]2 , involved in steps (I) and (II), different values of the total spin are reported. According to these calculations it results that both systems with high-spin electronic terms have lowest energy. The general energy gain calculated in this processes is -46.56 kcal/mol and this fact confirms the feasibility of this reaction.
Dinuclear manganese based enzymes engage in processes as diverse as hydrogen peroxide disproportionation and α-amino acidhydrolysis. N,N’-bis(2-pyridylmethyl)-ethylamine dimanganese complexes manifest a high catalytic activity in the hydrogen peroxide decomposition in two stages. In this work the results of DFT calculations on two complexes, [(L)2(Mn(III))2(CH3CO2)2(OH)2]2 and [(L)2(Mn(IV))2(CH3CO2)2(O)2]2 , involved in steps (I) and (II), different values of the total spin are reported. According to these calculations it results that both systems with high-spin electronic terms have lowest energy. The general energy gain calculated in this processes is -46.56 kcal/mol and this fact confirms the feasibility of this reaction.
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ARSENE, Ion. Studiul teoretic al descompunerii peroxidului de hidrogen cu complecşi dinucleari ai manganului. Studia Universitatis Moldaviae. Seria Ştiinţe Reale şi ale Naturii. 2015, nr. 6(86), pp. 168-175. ISSN 1814-3237. E-ISSN 1857-498X.