Right-Handed Helical Structure of Expanded Oligo(<scp>l</scp>-leucine) Containing [Ru(terpyridine)₂]²⁺ Moieties

Abstract

Expanded oligo(l-leucine)s, containing an alternate arrangement of a bis(terpyridine)ruthenium(II) moiety and a l-leucine residue, were synthesized and characterized by 1H NMR, UV, CD, and electrochemical properties. The intensity of CD spectra per ruthenium unit increased with the elongation of the peptide chain. 1H NMR analysis of a tetramer indicated the right-handed helical structure in acetonitrile.