Solid-State Studies of Some Retinal Iminium Salts and Related Compounds: Evidence for a 6-s-Trans Conformation

Article abstract of DOI:10.1021/ja00252a010

The solution and solid-state ¹³C NMR spectra of some retinylidene iminium salts have been examined.In the solid state, the interaction between cation and anion is much stronger and this is reflected by change in the chemical shift of the carbon