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Assessing Electronically Excited States of Cobalamins via Absorption Spectroscopy and Time-Dependent Density Functional Theory

  • Megan J. TodaEmail author
  • Pawel M. Kozlowski
  • Tadeusz AndruniówEmail author
Chapter
Part of the Challenges and Advances in Computational Chemistry and Physics book series (COCH, volume 29)

Abstract

In the field of B\(_{12}\) chemistry, absorption spectroscopy, hand in hand with computational modeling, has played an important role in describing electronically excited states of vitamin B\(_{12}\) derivatives, also known as cobalamins. This chapter focuses on the current understanding of absorption properties of cobalamins from both spectroscopic and computational points of views. The main emphasis is on methylcobalamin (MeCbl), adenosylcobalamin (AdoCbl), and cyanocobalamin (CNCbl). In addition, we will discuss some other unique derivatives including antivitamins, non-alkyl cobalamins, as well as reduced and super-reduced forms. Due to the complexity and the size of these systems, computational analysis is almost exclusively represented by density functional theory (DFT) and time-dependent DFT (TD-DFT) methods. Proper DFT functional choice is paramount in predicting electronic transitions and simulating the full spectrum reliably. At this juncture in the field of B\(_{12}\) chemistry, it is indisputable that the BP86 functional is the proper choice for the assessment of the electronically excited states of cobalamins.

Keywords

Vitamin B\(_{12}\) Photolysis Transient absorption spectroscopy B\(_{12}\)-dependent enzymes Co–C bond dissociation energy 

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of ChemistryUniversity of LouisvilleLouisvilleUSA
  2. 2.Advanced Materials Engineering and Modelling Group, Department of ChemistryWroclaw University of Science and TechnologyWrocławPoland

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