On the Mechanism of Intramolecular Sensitization of Photocleavage of the 2-(2-Nitrophenyl)propoxycarbonyl (NPPOC) Protecting Group

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2007
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Laimgruber, Stefan
Smirnova, Julia
Heinz, Björn
Gilch, Peter
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A spectroscopic study of a variety of covalently linked thioxanthone(TX)-linker-2-(2-nitrophenyl)propoxycarbonyl(NPPOC)-substrate conjugates is presented. Herein, the TX chromophore functions as an intramolecular sensitizer to the NPPOC moiety, a photolabile protecting group used in photolithographic DNA chip synthesis. The rate of electronic energy transfer between TX and NPPOC was quantified by means of stationary fluorescence as well as nanosecond and femtosecond time-resolved laser spectroscopy. A dual mechanism of triplet-triplet energy transfer has been observed comprising a slower mechanism involving the T1() state of TX with linker-length-dependent time constants longer than 20 ns and a fast mechanism with linker-length-dependent time constants shorter than 3 ns. Evidence is provided that the latter mechanism is due to energy transfer from the T2(n) state which is in fast equilibrium with the fluorescent S1(*) state. In the case of direct linkage between the aromatic rings of TX and NPPOC, the spectroscopic properties are indicative of one united chromophore which, however, still shows the typical NPPOC cleavage reaction triggered by intramolecular hydrogen atom transfer to the nitro group.

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ISO 690WÖLL, Dominik, Stefan LAIMGRUBER, Marina GALETSKAYA, Julia SMIRNOVA, Wolfgang PFLEIDERER, Björn HEINZ, Peter GILCH, Ulrich STEINER, 2007. On the Mechanism of Intramolecular Sensitization of Photocleavage of the 2-(2-Nitrophenyl)propoxycarbonyl (NPPOC) Protecting Group. In: Journal of the American Chemical Society. 2007, 129(40), pp. 12148-12158. ISSN 0002-7863. eISSN 1520-5126. Available under: doi: 10.1021/ja072355p
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@article{Woll2007Mecha-9743,
  year={2007},
  doi={10.1021/ja072355p},
  title={On the Mechanism of Intramolecular Sensitization of Photocleavage of the 2-(2-Nitrophenyl)propoxycarbonyl (NPPOC) Protecting Group},
  number={40},
  volume={129},
  issn={0002-7863},
  journal={Journal of the American Chemical Society},
  pages={12148--12158},
  author={Wöll, Dominik and Laimgruber, Stefan and Galetskaya, Marina and Smirnova, Julia and Pfleiderer, Wolfgang and Heinz, Björn and Gilch, Peter and Steiner, Ulrich}
}
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