Masayoshi Tabata
Muroran Institute of Technology
Japan
Title: Emerging of stretched and contracted helices of substituted polyacetylenes and its molecular oscillation in solution
Biography
Biography: Masayoshi Tabata
Abstract
Stretched (cis-transoid) and contracted (cis-cisoid) helices of mono-substituted polyacetylenes (SPAs) were selectively prepared using a [Rh(norbornadiene)Cl]2 in the presence of amine or alcohol cocatalyst in solution. The cis-transoid and cis-cisoid helices constructed from the aliphatic polyacetylenes ester main chain in solution showed an accordion-like helix oscillation and helios, respectively, where restricted rotations around the O-C bond in the ester side-chain are dynamically synchronized. The magnetic behaviour of the cis and trans radicals of SPAs produced through the rotational scission of the cis C=C bonds is also reported.