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Comparison of IR spectra in solid and liquid phases: (a) 11 in KBr pellet, (b) 11 in chloroform-d; (c) 13 in KBr pellet, and (d) 13 in chloroform-d. Liquid spectra were recorded using a CaF2 flow through cell. (Solution path length = 0.1 mm and concentration ~ 20 mM).
