Direct Evidence of a Liquid-Crystalline Phase Induced by Intermolecular C[BOND]H⋅⋅⋅Cl Interactions on the Basis of IR Spectroscopy and Theoretical Simulations



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Cl-ued together: Two chloroazodyes that only differ in the length of the flexible alkyl chains demonstrate different mesogenic behavior during thermal processes. The one with the C7H15 (1 a; see picture) alkyl chain shows an SmA phase, whereas the one with the C5H11 alkyl chain does not. The corresponding SmA phase of 1 a is attributed to intermolecular Cl⋅⋅⋅H interactions.