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The crystal structure of 1,2,3,4-tetrabromo,1-phenylbutane determined by single crystal synchrotron X-ray diffraction is described. Molecules of the compound compose a layered structure of the Langmuir–Blodgett film type (with tail-to-tail, head-to-head orientations of molecules of the neighboring layers) in which phenyl radicals of one layer contact with those of another. Halogen bonds and Br⋯Br contacts (four per each molecule) have the key importance for the molecular packing in the layer. The distance between bromine atoms in these bonds and contacts is 3.656-4.002 Å. The thermal analysis shows that the tetrabromophenylbutane melting point is 148 °C, with the compound starting to decompose at 150-280 °C in one step with releasing HBr and benzene. [ABSTRACT FROM AUTHOR]

The binary phase diagram of pyrene with 2,3-7,8-dibenzpyrene-1,6-quinone C24H12O2 was studied experimentally in 20–400 °C temperature interval at 0–100% of pyrene. The melting point of C24H12O2 was found to be 375 °C. The experimental data made it possible to estimate for the first time the thermal effect of melting of C24H12O2. The additive method was used to estimate the thermodynamic characteristics of C24H12O2. Obtained data allow to perform the thermodynamic modeling and calculation of the phase diagram of the C24H12O2–C16H10 system. Components form simple eutectic with coordinates of eutectic point: 94.70 mol% (91.58 mass%) of pyrene and 146.3 °C. [ABSTRACT FROM AUTHOR]