A Raman spectroscopic study of merocyanine aggregates of a 15N-isotopomer of 6-Nitro-1′,3′,3′-trimethylspiro[2H-1-benzopyran-2,2′- indoline]. A direct evidence for the association through the NO2-bridges

Article abstract of DOI:10.1246/cl.1996.715

A Raman spectroscopic study on large-sized merocyanine aggregates prepared by the irradiating a ¹⁵NO₂-isotopomer of 6-nitro-1′,3′,3′-trimethylspiro[2H-1-benzopyran-2,2′- indoline] (6-nitro BIPS) with UV light in a cyclohexane solutio