Studies of the growth of large-area free-standing single-crystalline films of p-quinquephenyl are presented. High-quality crystals were grown by slow cooling of a hot chlorobenzene solution. Worse quality large-area free-standing single crystals of p-quinquephenyl were also grown by using physical vapor transport and used for comparison. The crystal structure of p-quinquephenyl at 293 K and 85 K was refined by single-crystal X-ray diffraction. The optical absorption and photoluminescence spectra of solutions and crystalline films were obtained and analyzed; a positive solvatochromic effect was detected.

The influence of different solvents on the growth of anthracene crystals from solutions and on their morphological quality has been investigated. The dependence of the surface tension of solutions of anthracene in toluene on the anthracene concentration has been determined using the hanging drop method under conditions similar to the crystal growth conditions at the solution–air interface in an atmosphere saturated with solvent and precipitant vapors. The surface energies of the (100), (010), and (001) faces of anthracene crystal are calculated based on the structural data using the OPLS all-atom force field method. The surface energy value \({{\sigma }}_{{001}}^{V}\) at the air interface is estimated experimentally by measuring the contact water-drop wetting angle for the most developed (001) face. The thermodynamic analysis of the nucleation parameters for anthracene crystals at the solution–air interface has been carried out based on the obtained data on the surface energy.

trans-Stilbene single crystals are of great interest for researchers as scintillators characterized by a high specific light yield. Bulk trans-stilbene single crystals have been grown from an anisole solution. The transmission and photoluminescence spectra have been recorded, and the single-crystal photoluminescence quenching kinetics has been investigated. The scintillation properties of an element (17 × 12 × 5 mm in size) prepared from a grown trans-stilbene crystal, irradiated by γ radiation and X rays, have also been investigated. It is shown that the specific light yield of the obtained crystal is no less than that of a scintillation detector based on a trans-stilbene crystal (31.5 × 10 mm) grown from melt.

The change in the surface morphology of the (001) and (110) faces of K₂Co_xNi_(1−x)(SO₄)₂·6H₂O (KCNSH) mixed crystal, depending on the supercooling solution, has been studied under various conditions by laser interferometry. The experiments were carried out in both static mode, by changing the solution composition, and in dynamic mode, by changing the flow velocity. The conditions for the onset and suppression of the reaction of the isomorphic replacement leading to the formation of mosaic micro-inhomogeneity in mixed crystals have been studied. The mechanism of the reaction of isomorphic replacement has been analyzed depending on the shift of the solution composition from the initial one. For the first time, it has been observed that the reaction of isomorphic replacement may occur through a layer-by-layer mechanism.