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[摘要]：Fluorescence and fluorescence excitation spectra of terrylene in 9,10-dibromoanthracene matrix were studied at 5 K. Characteristic singlet oxygen phosphorescence, O(2)((1)Delta(g)) -> O(2)((3)Sigma(g)) with the line maximum at 1272.5 nm, was observed after excitation of terrylene molecules embedded into one of its two sites. It indicates that singlet oxygen, precursor in photo-oxidation of aromatic molecules, can be created only for those oxygen molecules which can form weak van der Waals complex with terrylene. According to quantum-chemical calculations terrylene and oxygen can form complex with the bonding energy 141 cm(-1), in which oxygen molecule is located along the long axis of terrylene, similar to 0.3 nm apart, with the molecular axis inclined by 110 degrees. (C) 2011 Elsevier B.V. All rights reserved. |
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