Abstract
Static conformations of oligo- and polysarcosine chains were investigated by the energy transfer from an energy donating 2-naphthyl group attached to one end of the chain, to an energy accepting dimethylaminonaphthalenesulfonyl (dansyl) group on the other end of the chain [Dns-(Sar)n-2Nap]. The energy transfer efficiency X, was determined from fluorescence excitation spectra of the dansyl group as a function of chain length and temperature. An alternation in the transfer efficiency was observed with a step-by-step increase in the number of sarcosine units n, from 4 to 9, with higher efficiencies for odd n’s. The efficiency decreased with further increase in chain length but could still be detected at n=150 (X=0.11). The transfer efficiency increased considerably at low temperatures and it approached unity at about −60°C, even for such long chains as n=120. The energy transfer between the donor-acceptor pair attached to a rigid poly(β-benzyl L-aspartate) chain, Dns-[Asp(OBzl)]n-2Nap, showed no temperature dependence. The marked enhancement observed on the polysarcosine chain was ascribed to a conformational change at low temperatures into folded or compact conformations.
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Sisido, M., Egusa, S., Yagyu, K. et al. Intramolecular End-to-End Energy Transfer on Polypeptide Chains. Effects of Chain Length, Temperature, and Chain Stiffness. Polym J 17, 587–595 (1985). https://doi.org/10.1295/polymj.17.587
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DOI: https://doi.org/10.1295/polymj.17.587