Steric hindrance effect of the equatorial ligand on Fe(IV)O and Ru(IV)O complexes: a density functional study.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry
Yi Wang, Keli Han

Abstract

The geometric structures and mechanisms for hydrogen abstraction from cyclohexane for four high-valent complexes, [Fe IV(O)(TMC)(NCMe)]2+ (where TMC is 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane; 1-NCMe), the inverted isomer [Fe IV(NCMe)(TMC)(O)]2+ (2-NCMe), [Ru IV(O)(TMC)(NCMe)]2+ (the ruthenium analogue of 1-NCMe; 3-NCMe), and the inverted isomer [Ru IV(NCMe)(TMC)(O)]2+ (4-NCMe), were investigated using density functional theory. The axial NCMe ligand was found to be sterically more hindered in 2-NCMe than in 1-NCMe, which is in accord with the calculated results that the Fe-L axial distance is longer in the former. Both 1-NCMe and 2-NCMe are capable of hydrogen abstraction from cyclohexane via two-state reactivity patterns. In contrast, 3-NCMe and 4-NCMe react with cyclohexane by a single-state mechanism. The reaction pathways computed reveal that 2-NCMe is more reactive than 1-NCMe, in agreement with experimental results, whereas the reactivity of 3-NCMe and 4-NCMe shows little dependence on whether the oxo unit is syn or anti to the four N-methyl groups. Our analysis shows that along the reaction pathway for 2-NCMe in the triplet spin state, the NCMe ligand moves away from the iron center, and therefore the ene...Continue Reading

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Citations

Jan 12, 2011·Proceedings of the National Academy of Sciences of the United States of America·Shengfa Ye, Frank Neese
May 18, 2017·Physical Chemistry Chemical Physics : PCCP·Jian WangPo-Heng Lee
May 21, 2010·Chemical Communications : Chem Comm·Kyung-Bin ChoWonwoo Nam
Jun 21, 2012·Chemistry : a European Journal·Kyung-Bin ChoWonwoo Nam
Mar 7, 2020·Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry·Zixian LiLiang Dong
Sep 9, 2015·Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry·Wang YiWang Yong
Dec 22, 2010·Journal of the American Chemical Society·Dandamudi UsharaniSason Shaik
Nov 18, 2014·Journal of Chemical Theory and Computation·Dong Fang, G Andrés Cisneros

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