Circular dichroism measurements of benzyl L‐aspartate–nitrobenzyl L‐aspartate copolymers and their use in detecting and characterizing preferred polymer conformations

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Abstract
We have examined the nature of the circular dichroism band at 330 mμ for a series of copolymers of β‐p‐nitrobenzyl L‐aspartate with β‐benzyl L‐aspartate. The circular dichroism band arises from an electronic transition in the nitroaromatic group. In order to interpret the effect quantitatively, we employed a simplified statistical treatment and curve fitting for six copolymers. Both approaches gave consistent results, which indicates that the dichroism comes from pairwise interactions between two nitrobenzyl groups. We constructed a molecular model that meets the constraints and requirements of the analyses developed in this paper. In this model, it is proposed that the main chain forms a right‐handed α‐helix and that nitrobenzyl groups separated by four residues interact with each other.

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