Igor Yu. Denisyuk

Organic noncentrosymmetric complexes of 4-nitrophenol for second harmonic generation

The paper reports synthesis and co-crystallization of 5 co-crystal of 4-nitrophenol (4N) with five different monoand diaminopyridines (4-aminopyridine (4AP); 3,4-diaminopyridine (34DAP); 2-amino-6-methylpyridine (26MAP); 2,6- diaminopyridine (26DAP); 2-aminopyridine (2AP)) resulted in five adducts with the molar ratio of components 2:1 in final compounds. X-ray analysis confirms the non-centrosymmetric packing of obtained compounds. Two compounds crystallize in the polar acentric P21 and three compounds crystallize in acentric orthorhombic Pna21 space groups. The comparative studies on the laser induced multiple and single shot damage thresholds of named crystals were carried out using radiation of 1064 nm from Nd:YAG laser with pulse width 10 ns. Obtained results show good laser-induced singleshot and multiple-shot damage threshold values for all studied co-crystals and are found up to 3.64 GW/cm2 and 1.77 GW/cm2 respectively.

Comparison study of non-centrosymmetric materials from aminopyridines

Performed study on the co-crystallization of heterocyclic molecules of aminopyridine series with a nonlinear optical chromophore (4-Nitrophenol) and receiving molecular crystals with non-centrosymmetric crystal lattice based on them. Experiments on the growth of single crystals of these substances by slow evaporation technique in a closed volume. The dependence of the crystal symmetry on the growing conditions. A comparative study of nonlinear optical properties of crystals based on aminopyridines and measured their nonlinear optical coefficients.

N,N-Diethyl-4-[(E)-(pyridin-3-yl)diazen­yl]aniline

The molecule of the title compound, C15H18N4, adopts a trans conformation with respect to the diazo N=N bond. The dihedral angle between the benzene and pyridine rings in the molecule is 8.03 (5)°. In the crystal, a weak C—H⋯π interaction arranges the molecules into a corrugated ribbon, with an antiparallel orientation of neighboring molecules propagating in the [100] direction.

Effective materials for display applications: fullerene-doped PDLC

New fullerene-doped nematic liquid crystal spatial light modulator with Mg-phthalocyanine nanocrystals has been investigated. Temporal characteristics of this device have been studied. Based on complex formation between fullerene and phthalocyanine, it has been shown that new structure exhibits high speed and operates at supply voltage pulse frequency of more than 100 Hz. A mechanism of a liquid crystal mesophase orientation has been discussed. Potentials of the system for display application have been examined.

Dynamic characteristics study of fullerene-doped LC SLM based on phthalocyanine nanocrystals

Temporal and modulating characteristics of a fullerene-doped nematic liquid crystal spatial light modulator based on Mg-phthalocyanine nanocrystals have been investigate. It has been established that the structure exhibits high speed and operates at supply voltage pulse frequency of more ethan 100 Hz. A mechanism of a liquid crystal mesophase orientation using a complex formation between fullerene and phthalocyanine has been discussed. Possibilities of the system for display application have been examined.

Successive photothermoplastic process: a high-sensitivity and high-resolution reversible photomaterial - methods of recording and reading semitone images

New photothermoplastic material was made by solved together of three problems: to provide registering material with record high-sensitivity and high-resolution, to provide for inner rastering, to develop the transformation of the phase image to the amplitude one.