Synthesis, crystal structure, and spectral characteristics of N-(Hydroxyethyl)aminomethanesulfonic acid

A new method of the synthesis of N-(hydroxyethyl)aminomethanesulfonic acid by reaction in SO₂-H₂NCH₂CH₂OH-CH₂O-H₂O system was developed. Compound HO(CH₂)₂NHCH₂SO₃H was characterized by XRD, IR and mass spectroscopy.     

Acylation of 5-phenyl-2-(fur-2-yl)oxazole

The ability of 5-phenyl-2-(fur-2-yl)oxazole to undergo acetylation and formylation is considered. It was established by x-ray structure analysis that electrophilic substitution proceeds at the position 5 of the furan ring. The direction of the reactions is analyzed from positions of the energy preference of transition states. Institute of Monocrystals, Academy of Sciences (NAN) of Ukraine, Khar'kov 310001. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1466–1471, November, 1997.     

The complex phosphate K0.92In0.46Nb0.54OPO4: a new representative of the KTiOPO4 family

Aliovalent K_0.92In_0.46Nb_0.54OPO₄ (KINP, potassium indium niobium oxide phosphate) features a chain structure involving corner‐sharing [MO₆] octahedra (M = In/Nb), which allows this compound to be recognized as a member of the KTiOPO₄ (KTP) family. However, its crystallization in the polar space group P4₁ belonging to the 4/m Laue group generates its own subclass of KTP‐related compounds. The unit cell contains 18 symmetry‐independent atoms occupying general positions. The cis–cis principle of octahedral arrangement is observed for each of the separate [MO₆]_∞ chains. The observed variations in the cis–cis linkage are critically important for nonlinear optical properties and distinguish the present compound from other KTP‐related structures. The anionic framework adopts one‐dimensional tunnels running orthogonal to the ab plane. The K⁺ ions are arranged in the [001] direction at a distance of c. Merohedral twinning was detected during the structure refinement.     

Radiation-stimulated defects into LaB3O6 and Li6Gd(BO3)3:Ce single crystals

The radiation-induced defect types in LaB₃O₆ and Li₆Gd(BO₃)₃:Ce single crystals have been determined taking into account crystal-lattice features, absorption characteristics, photo- and thermostimulated luminescence data. The possible activator center models in Li₆Gd(BO₃)₃:Ce crystals are proposed.     

Synthesis,morphology and structure of the dense (Y1‐xEux)2O3 spherical shape particles

The method to decrease of the porosity (densification) of crystalline spherical particles of the solid substitution solution, obtained by the method of precipitation from aqueous solution followed by low temperature crystallization of the amorphous intermediate product was proposed. The comparative analysis of morphology and structure of the particles before and after densification have been carried. It has been established that porosity of (Y_1‐xEu_x)₂O₃ particles has decreased 5 times compared to their initial state. It has been shown that densification process of the (Y_1‐xEu_x)₂O₃ spherical particles changes their morphology and structure: the size of the crystals doubles, the number and area of crystalline boundaries decrease, the intercrystalline spaces, which forming pores, are almost absent.     

Synthesis, crystal structure, vibrational spectra, and thermochemical transformations of tris(hydroxymethyl)aminomethane

A practically promising compound, tris(hydroxymethyl)aminomethane sulfate ((TRISH)₂SO₄, C₈H₂₄N₂O₁₀S) was synthesized and studied by a set of experimental methods (elemental analysis, IR and Raman spectroscopy, mass spectrometry, thermogravimetry).     

Onium salts of sulfur-containing oxyanions resulting from reaction of sulfur(IV) oxide with aqueous solutions of 1,2-diamines and morpholine

Reaction products have been isolated from SO₂–L–H₂O–О2 systems (L = ethylenediamine, N,N,N′,N′-tetramethylethylenediamine, piperazine, and morpholine) as onium salts [H₃NCH₂CH₂NH₃]SO₄, [(CH₃)₂NHCH₂CH₂NH(CH₃)₂]SO₄, [(CH₃)₂NHCH₂CH₂NH(CH₃)₂]S₂O₆ ? H₂O, [C₄H₈N₂H₄]SO₃ ? H₂O, [C₄H₈N₂H₄]S₂O₆, [C₄H₈N₂H₄]SO₄ ? H₂O, [O(C₂H₄)₂NH₂]₂SO₄ ? H₂O. The prepared compounds have been characterized by X-ray diffraction analysis, X-ray powder diffraction, IR and mass spectroscopy.