Photogenerated cumulenic structure of adamantyl endcapped linear carbon chains: An experimental and computational investigation based on infrared spectroscopy
Yildizhan MM, Fazzi D, Milani A, Brambilla L, Del Zoppo M, Chalifoux WA, Tykwinski R, Zerbi G (2011)
Publication Type: Journal article, Original article
Publication year: 2011
Journal
Original Authors: Yildizhan M.M., Fazzi D., Milani A., Brambilla L., Del Zoppo M., Chalifoux W.A., Tykwinski R.R., Zerbi G.
Publisher: American Institute of Physics (AIP)
Book Volume: 134
Article Number: 124512
Journal Issue: 12
DOI: 10.1063/1.3571451
Abstract
The infrared (IR) spectrum of an adamantyl endcapped , -polyyne (the hexayne, Ad-C-Ad) is investigated both experimentally and computationally. A new IR band is observed upon UV photoexcitation of the compound (embedded in a poly methyl methacrylate matrix at 78 K), thus, revealing the existence of new photogenerated molecular structure trapped at low temperature. Complete reversibility is found, thus, demonstrating that the photoexcitation is responsible for the generation of metastable excited states of the molecule. Density functional theory and time dependent density functional theory calculations indicate that these metastable states result from the forbidden singlet (S) or triplet (T) excited states, and geometry optimizations of the polyyne trapped in either S andor T states demonstrate that the carbon chain takes on a cumulenic structure. Comparison of the experimental and the computed IR spectra for the molecule trapped in the forbidden states confirms that the new IR features are clear markers of cumulenic species. The temperature and time dependent behavior of the new IR band is analyzed, while the experimentally determined value of the activation energy highlights the low stability of these molecular structures. © 2011 American Institute of Physics.
Authors with CRIS profile
Involved external institutions
Politecnico di Milano
Italy (IT)
University of Alberta
Canada (CA)
Italian Institute of Technology / Istituto Italiano di Tecnologia (IIT)
Italy (IT)
Italy (IT)
University of Alberta
Canada (CA)
Italian Institute of Technology / Istituto Italiano di Tecnologia (IIT)
Italy (IT)
How to cite
APA:
Yildizhan, M.M., Fazzi, D., Milani, A., Brambilla, L., Del Zoppo, M., Chalifoux, W.A.,... Zerbi, G. (2011). Photogenerated cumulenic structure of adamantyl endcapped linear carbon chains: An experimental and computational investigation based on infrared spectroscopy. Journal of Chemical Physics, 134(12). https://dx.doi.org/10.1063/1.3571451
MLA:
Yildizhan, Melike Mercan, et al. "Photogenerated cumulenic structure of adamantyl endcapped linear carbon chains: An experimental and computational investigation based on infrared spectroscopy." Journal of Chemical Physics 134.12 (2011).
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