Lasalocid crystallized from methanol: spectroscopic and X-ray structural evidence for two structures

Abstract

Results of i.r. absorption and Raman scattering data and X-ray crystallographic data for lasalocid crystallized from methanol have enabled identification of two distinct structures for the 1 : 1 lasalocid–methanolate complex. Both have space group P2₁2₁2₁ but possess a different molecular geometry. The ketone carbonyl stretching frequency in the 1 700–1 730 cm^–1 region is a sensitive indicator of crystalline modification.