title: Synthesis, conformation and chiroptical properties of diaryl esters of tartaric acid.
abstract: Previously unknown diaryl esters of l-tartaric acid have been synthesized. Their conformations have been studied by DFT calculations, NMR and circular dichroism spectroscopy in solution, as well as by X-ray diffraction in the crystalline state. The four-carbon tartrate chain of diaryl esters was found to be extended in all cases, with a higher degree of nonplanarity in the crystals. Dinaphthyl tartrates show unusually strong exciton Cotton effects (A = -228 for di-1-naphthyl l-tartrate) due to the coupling of allowed 1B(b) transitions in naphthyl chromophores, despite the acyclic structure and significant distance (over 10 A) between the two chromophores.
authors.affiliation: Department of Chemistry, Adam Mickiewicz University, 60-780 Poznan, Poland.
authors.forename: Robert
authors.initials: R
authors.lastname: Cysewski
authors.forename: Marcin
authors.initials: M
authors.lastname: Kwit
authors.forename: Beata
authors.initials: B
authors.lastname: Warzajtis
authors.forename: Urszula
authors.initials: U
authors.lastname: Rychlewska
authors.forename: Jacek
authors.initials: J
authors.lastname: Gawroński