http://www.cnr.it/ontology/cnr/individuo/prodotto/ID191754
Dielectric and Thermal Effects on the Optical Properties of Natural Dyes: A Case Study on Solvated Cyanin (Articolo in rivista)
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- Dielectric and Thermal Effects on the Optical Properties of Natural Dyes: A Case Study on Solvated Cyanin (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/ja0201733v (literal)
- Alternative label
Osman Baris Malcio?glu, Arrigo Calzolari, Ralph Gebauer, Daniele Varsano, and Stefano Baroni (2011)
Dielectric and Thermal Effects on the Optical Properties of Natural Dyes: A Case Study on Solvated Cyanin
in Journal of the American Chemical Society (Print); ACS, American chemical society, Washington, DC (Stati Uniti d'America)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Osman Baris Malcio?glu, Arrigo Calzolari, Ralph Gebauer, Daniele Varsano, and Stefano Baroni (literal)
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- SISSA ? Scuola Internazionale Superiore di Studi Avanzati, I-34136 Trieste, Italy
CNR-IOM DEMOCRITOS Simulation Center, c/o SISSA, I-34136 Trieste, Italy
ICTP ? The Abdus Salam International Centre for Theoretical Physics, I-34151 Trieste, Italy
Dipartimento di Fisica, Universit?a \"La Sapienza\", 00185 Roma, Italy
Centro S3, CNR-Nano Istituto di Nanoscienze, I-41100 Modena, Italy (literal)
- Titolo
- Dielectric and Thermal Effects on the Optical Properties of Natural Dyes: A Case Study on Solvated Cyanin (literal)
- Abstract
- The optical properties of the flavylium state of the cyanin dye are simulated numerically by combining Car-Parrinello molecular dynamics and linear-response time-dependent density functional theory calculations. The spectrum of the dye calculated in the gas phase is characterized by two peaks in the yellow and in the blue (green and violet), using a GGA-PBE (hybrid-B3LYP) DFT functional, which would bring about a greenish (bright orange) color incompatible with the dark purple hue observed in nature. Describing the effect of the water solvent through a polarizable continuum model does not modify qualitatively the resulting picture. An explicit simulation of both solvent and thermal effects using ab initio molecular dynamics results instead in a spectrum that is compatible with the observed coloration. This result is analyzed in terms of the spectroscopic effects of the molecular distortions induced by thermal fluctuations. (literal)
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