Determination of the chiral structure of using anomalous x-ray scattering near the Cs K absorption edge

A structural study of , grown from aqueous solution, was performed using anomalous x-ray scattering near the Cs K absorption edge to determine an absolute configuration of constituent atoms. The sense of the helical structure of the chain was found to be predominantly right-handed through a comparison of observed Bragg Bijvoet ratios with calculated ones. Assuming that consists of the two domains (i.e. right- and left-handed helices), we estimate that the volume fraction for the right-handed helix is .