### Abstract

The fluorescence quenching of Y-4,9-dihydro-4,6-dimethyl-9-oxo-1H-imidazo-1,2-a purine (Y_{t} base) and of some model compounds Y_{t}(CH_{2})_{n}adenine (n = 2, 3, 5) by α-bromonaphthalene was studied in various solvents. The dependence of the ratio k/k_{d} (where k is the rate constant for energy transfer from Y_{t} to α-bromonaphthalene and k_{d} is the diffusion rate constant) on the integrated overlap of the Y_{t} fluorescence and the singlet-triplet absorption of α-bromonaphthalene was linear. The constant k for the model compounds varied with the length of the polymethylene chain and attained its lowest value for n = 3. This is probably due to an increased degree of base stacking interaction in the trimethylene-bridged compound.

Original language | English |
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Pages (from-to) | 71-76 |

Number of pages | 6 |

Journal | Journal of Photochemistry |

Volume | 20 |

Issue number | 1 |

DOIs | |

State | Published - 1 Jan 1982 |

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## Cite this

_{t}base) and the model compounds Y

_{t}(CH

_{2})

_{n}adenine by α-bromonaphthalene.

*Journal of Photochemistry*,

*20*(1), 71-76. https://doi.org/10.1016/0047-2670(82)80048-8