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(a) Spectra of dilute solutions of xylindein in chlorobenzene (CB), chloroform (CF), and tetrahydrofuran (THF). (b) The absorption spectrum in DCM divided by ℏω and fit using two vibronic progressions, each described by eq 1. The fit parameters are listed in Table 1. The sum of the contributions of the two tautomers to the spectra is also included.
