Relative stability of the La and Lb excited states in adenine and guanine: Direct evidence from TD-DFT calculations of MCD spectra

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Relative stability of the La and Lb excited states in adenine and guanine: Direct evidence from TD-DFT calculations of MCD spectra (58 views)

Santoro F, Improta R, Fahleson T, Kauczor J, Norman P, Coriani S

J Phys Chem Lett (ISSN: 1948-7185, 1948-7185electronic), 2014 Jun 5; 5(11): 1806-1811.

Abstract
The relative position of La and Lb ππ* electronic states in purine nucleobases is a much debated topic, since it can strongly affect our understanding of their photoexcited dynamics. To assess this point, we calculated the absorption and magnetic circular dichroism (MCD) spectra of adenine, guanine, and their nucleosides in gas-phase and aqueous solution, exploiting recent developments in MCD computational technology within time-dependent density functional theory. MCD spectroscopy allows us to resolve the intense S0 La transition from the weak S 0Lb transition. The spectra obtained in water solution, by using B3LYP and CAM-B3LYP functionals and describing solvent effect by cluster models and by the polarizable continuum model (PCM), are in very good agreement with the experimental counterparts, thus providing direct and unambiguous evidence that the energy ordering predicted by TD-DFT, La < L b, is the correct one. © 2014 American Chemical Society.

Affiliations ▼

*** IBB - CNR Affiliation

Istituto di Chimica Dei Composti Organometallici (ICCOM-CNR), Area della Ricerca Del CNR, via Moruzzi 1, I-56124 Pisa, Italy

Istituto di Biostrutture e Bioimmagini-CNR, Via Mezzocannone 6, I-80134 Napoli, Italy

Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden

Dipartimento di Scienze Chimiche e Farmaceutiche, Università Degli Studi di Trieste, via L. Giorgieri 1, I-34127 Trieste, Italy

Details ▼

Impact factor: 6.687, 5-year impact factor: 6.91

Paper type: Journal Article,

Keywords: Complex Polarization Propagator, Dna Bases, Hidden Transitions, Magnetic Circular Dichroism, Photostability, Solvent Effect, Continuum Mechanics, Density Functional Theory, Spectroscopy, Photo-Stability, Positive Ions,

Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-84902075875&partnerID=40&md5=66826b56424b94b8aef5f5b1de95dba0

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Conti, I., Alto, P., Stenta, M., Garavelli, M., Orlandi, G., Adenine Deactivation in DNA Resolved at the CASPT2//CASSCF/AMBER Level (2010) Phys. Chem. Chem. Phys., 12, pp. 5016-5023

Kwok, W. -M., Ma, C., Phillips, D. L., Femtosecond Time- and Wavelength-Resolved Fluorescence and Absorption Spectroscopic Study of the Excited States of Adenosine and an Adenine Oligomer (2006) J. Am. Chem. Soc., 62, pp. 11894-11905

Mason, W. R., (2007) A Practical Guide to Magnetic Circular Dichroism Spectroscopy, , Wiley: New York

Kj rgaard, T., J rgensen, P., Thorvaldsen, A., Salek, P., Coriani, S., Gauge-Origin Independent Formulation and Implementation of Magneto-Optical Activity within Atomic-Orbital-Density Based Hartree-Fock and Kohn-Sham Response Theories (2009) J. Chem. Theory Comput., 5, pp. 1997-2020

Kj rgaard, T., Kristensen, K., Kauczor, J., J rgensen, P., Coriani, S., Thorvaldsen, A., Comparison of Standard and Damped Response Formulations of Magnetic Circular Dichroism (2011) J. Chem. Phys., 135, p. 024112

Kj rgaard, T., Coriani, S., Ruud, K., Ab Initio Calculation of Magnetic Circular Dichroism (2012) WIREs Comput. Mol. Sci., 2, pp. 443-455

Sutherland, J. C., Holmquist, B., Magnetic Circular Dichroism of Biological Molecules (1980) Annu. Rev. Biophys. Bioeng., 9, pp. 293-326

Becke, A. D., Density-Functional Exchange-Energy Approximation with Correct Asymptotic Behavior (1988) Phys. Rev. A, 38, pp. 3098-3100

Dunning, T. H., Gaussian Basis Sets for Use in Correlated Molecular Calculations. I. The Atoms Boron through Neon and Hydrogen (1989) J. Chem. Phys., 90, pp. 1007-1023

Frisch, M. J., Trucks, G. W., Schlegel, H. B., Scuseria, G. E., Robb, M. A., Cheeseman, J. R., Scalmani, G., Petersson, G. A., (2009) Gaussian 09, , revision C. 3

Yanai, T., Tew, D. P., Handy, N. C., A New Hybrid Exchange-Correlation Functional Using the Coulomb-Attenuating Method (CAM-B3LYP) (2004) Chem. Phys. Lett., 393, pp. 51-57

Peach, M. J. G., Helgaker, T., Sa ek, P., Keal, T. W., Lutnaes, O. B., Tozer, D. J., Handy, N. C., Assessment of a Coulomb-Attenuated Exchange-Correlation Energy Functional (2006) Phys. Chem. Chem. Phys., 8, pp. 558-562

Woon, D. E., Dunning, T. H., Gaussian Basis Sets for Use in Correlated Molecular Calculations. IV. Calculation of Static Electrical Response Properties (1994) J. Chem. Phys., 100, pp. 2975-2988

(2013) DALTON, , http: //daltonprogram. org/, a molecular electronic structure program, Release Dalton 2013 and LSDalton 2013

F lscher, M., Serrano-Andr s, L., Roos, B., A Theoretical Study of the Electronic Spectra of Adenine and Guanine (1997) J. Am. Chem. Soc., 119, pp. 6168-6176

Sutherland, J. C., Griffin, K., Magnetic Circular Dichroism of Adenine, Hypoxanthine, and Guanosine 5'-Diphosphate to 180 nm (1984) Biopolymers, 23, pp. 2715-2724

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