Can TD-DFT calculations accurately describe the excited states behavior of stacked nucleobases? The cytosine dimer as a test case

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Can TD-DFT calculations accurately describe the excited states behavior of stacked nucleobases? The cytosine dimer as a test case (77 visite)

Santoro F, Barone V, Improta R

J Comput Chem (ISSN: 0192-8651, 1096-987xelectronic, 0192-8651linking), 2008 Apr 30; 29(6): 957-964.

Tipo di articolo: Journal Article, Comparative Study,

Impact factor: 3.39

Impact factor a 5 anni: 5.364

Parole chiave: Cytosine, Excited States, Nucleic Acids, Stacking, Time-Dependent Density Functional Theory, Charge Transfer, Cytosine Dimers, Stacked Nucleobases, Polymer, Article, Chemical Model, Chemical Structure, Chemistry, Comparative Study, Dimerization, Quantum Theory, Molecular,

Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-41549147727&partnerID=40&md5=23d21a3e3af53f7b66043cf8b5bb06c1

By using calculations rooted in the time dependent density functional theory (TD-DFT) we have investigated how the lowest energy excited states of a face-to-face π-stacked cytosine dimer vary with the intermonomer distance (R). The perfomances of different density functionals have been compared, focussing mainly on the lowest energy single excited state of the dimer (S 1)2. TD-PBEO, TD-LC-ωPBE, and TD-M05-2X provide a picture very similar to that obtained at the CASPT2 level by Merchan et al. (J Chem Phys 2006, 125, 231102), predicting that (S1)2 has a minimum for R ∼ 3Å, with a binding energy of ∼0.5 eV, whereas TD-B3LYP, TD-CAM-B3LYP, and TD-PBE understimate the binding energy. However, independently of the functional employed, no low-energy spurious charge transfer transitions are predicted by TD-DFT calculations, also when a nonsymmetric dimer is investigated, providing encouraging indications for the use of TD-DFT for studying the excited state of π -stacked nucleobases. © 2007 Wiley Periodicals, Inc.

*** IBB - CNR ***

Istituto per i Processi Chimico-Fisici, CNR, Area della Ricerca del CNR, Via Moruzzi, 1, I-56124 Pisa, Italy

Dipartimento di Chimica, Università Federico II, Complesso Universitario Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy

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

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CYTOSINE-ARABINOSIDE INCREASES THE BINDING OF I-125 LABELED EPIDERMAL GROWTH-FACTOR AND I-125 TRANSFERRIN AND ENHANCES THE IN-VITRO TARGETING OF HUMAN TUMOR-CELLS WITH ANTI-(GROWTH FACTOR-RECEPTOR) MAB (73 visite)
Caraglia M, Tagliaferri P, Correale P, Genua G, Pinto A, Del Vecchio S, Esposito G, Bianco AR
Cancer Immunology Immunotherapy (ISSN: 0340-7004), 1993 Sep; 37(3): 150-156.
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EPIDERMAL GROWTH-FACTOR (EGFR) AND TRANSFERRIN (TRFR) RECEPTOR UP-REGULATION IS INDUCED BY ARABINOSIDE CYTOSINE (ARA-C) ON HUMAN TUMOR-CELLS (64 visite)
Caraglia M, Correale P, Genua G, Pepe S, Del Vecchio S, Esposito G, Bianco AR, Tagliaferri P
(ISSN: 0361-090x), 1993; 17(2): 337-338.
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37 Records (34 escludendo Abstract e Conferenze).
Impact factor totale: 185.304 (179.287 escludendo Abstract e Conferenze).
Impact factor a 5 anni totale: 193.565 (184.38 escludendo Abstract e Conferenze).

Interrogazione bibliografica effettuata: (([btitle] "Cytosine" OR [btitle] "Excited States" OR [btitle] "Nucleic Acids" OR [btitle] "Stacking" OR [btitle] "Time-Dependent Density Functional Theory") AND NOT [id] = 9140)

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Ultima modifica di Marco Comerci in data Friday 26 May 2017, 11:20:11
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