Intramolecular interaction between nitroxide radical and photoexcited benzophenone triplet linked to peptide templates

被引：15

作者：

Sartori, E

Toffoletti, A

Rastrelli, F

Corvaja, C ^{[1
]}

Bettio, A

Formaggio, F

Oancea, S

Toniolo, C

机构：

[1] CNR, Dept Phys Chem, I-35131 Padua, Italy

[2] CNR, Inst Biomol Chem, I-35131 Padua, Italy

[3] Univ Padua, Dept Organ Chem, I-35131 Padua, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2003年 / 107卷 / 36期

关键词：

D O I：

10.1021/jp0345203

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of heptapeptides and one dodecapeptide doubly labeled with a triplet precursor (4'-benzoylphenylalanine) and a nitroxide (4-amino-1-oxyl-2,2,6,6-tetramethylpiperidine-4-carboxylic acid) have been synthesized by solution methods and studied through their FT-IR absorption and time-resolved EPR spectra with UV laser pulse excitation. All of the oligopeptides show EPR nitroxide lines strongly polarized in emission because of the intramolecular interaction between the free radical and the photoexcited triplet. The kinetics of the time evolution of the EPR lines is analyzed to study the radical-triplet interaction in the series of heptapeptides characterized by diverging radical and triplet relative positions in the amino acid sequence.

引用

页码：6905 / 6912

页数：8

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[1]

[Anonymous], HYP

[2] TRICHOGIN-A-IV, AN 11-RESIDUE LIPOPEPTAIBOL FROM TRICHODERMA-LONGIBRACHIATUM [J].