Abstract
The melting point and enthalpy of fusion are refined for p-quaterphenyl (4P) and measured for the first time for its derivative with two terminal trimethylsilyl substituents (TMS-4P-TMS) by DSC method. The optical absorption spectra of 4P and TMS-4P-TMS solutions in toluene are measured at 25°C. Analysis of the absorption spectra shows the range within which aggregated solutions of the investigated substances exist. The shape of the absorption spectra of concentrated TMS-4P-TMS solutions indicates the J-aggregation of molecules occurs. It is found that the solubility of the TMS-4P-TMS derivative in toluene at room temperature is almost six times higher than that of p-quaterphenyl. Large single-crystal films and plates of the investigated compounds (up to 8 mm in size for 4P and up to 25 mm in size for TMS-4P-TMS) are obtained by growing them from solutions. Data on crystal growth of TMS-4P-TMS are reported for the first time.
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