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Positive-ion mass spectra by MALDI-ToF of (a) croconaine dyes #2 (M, C27H22Br2N2O3), (b) #3 (M, C27H22F2N2O3), and (c) #6 (M, C39H30N4O7) obtained by using DAN as the matrix. Inset of plot (a) shows the simulated isotopic pattern of a radical molecular ion with composition [C27H22Br2N2O3]+•, which is in good agreement with the experimental pattern of croconaine dyes #2.
