Synthesis of azolyl-substituted adamantane derivatives and their coordination compounds

Russian Chemical Bulletin - Reactions of adamantylazoles with nucleophiles (water, carbon monoxide, acetonitrile) in sulfuric acid were studied. New bifunctional adamantane derivatives containing...     

Modern Trends in the In Vitro Production and Use of Callus,Suspension Cells and Root Cultures of Medicinal Plants

This paper studies modern methods of producing and using callus, suspension cells and root cultures of medicinal plants in vitro. A new solution for natural product production is the use of an alternative source of renewable, environmentally friendly raw materials: callus, suspension and root cultures of higher plants in vitro. The possibility of using hairy root cultures as producers of various biologically active substances is studied. It is proven that the application of the genetic engineering achievements that combine in vitro tissue culture and molecular biology methods was groundbreaking in terms of the intensification of the extraction process of compounds significant for the medical industry. It is established that of all the callus processing methods, suspension and root cultures in vitro, the Agrobacterium method is the most widely used in practice. The use of agrobacteria has advantages over the biolistic method since it increases the proportion of stable transformation events, can deliver large DNA segments and does not require special ballistic devices. As a result of the research, the most effective strains of agrobacteria are identified.     

Triangular Clusters of Molybdenum Coordinated with Diethylthiocarbamate: Synthesis,Structure and Solution Behavior

Two novel clusters [Mo₃S₄(dtc)₃(μ-dtc)(L)] (where L = (CD₃)₂SO and tetrahydrothiophene, tht) were prepared and structurally characterized. The tht complex and its previously reported congener with L = py were studied by means of temperature-dependent ¹H NMR spectroscopy, indicating order of lability tht ? py.     

EFFECT OF POLYMORPHISM ON THE LUMINESCENT PROPERTIES ON SILVER(I) NITRATE COMPLEXES WITH 2-AMINO-5-PHENYLPYRAZINE

Journal of Structural Chemistry - The reaction between AgNO3 and 2-amino-5-phenylpyrazine (L) at a molar ratio Ag:L = 1.5:1 (synthesis time 3-4 h) in the acetonitrile...     

Development of a procedure of X-ray study of thin layers by the example of cobalt phthalocyanine

A procedure of the X-ray diffraction study of thin layers using a single crystal X-ray diffractometer equipped with a microfocus tube is described. It is demonstrated that α-cobalt phthalocyanine layers deposited by thermal vacuum evaporation onto polished surfaces of substrates (glass, quartz) have a perfectly oriented polycrystalline structure. The (00l) planes of all crystallites are oriented along the surface of the substrate. The structural organization of layers is analyzed.     

STUDY OF THE CORRELATION BETWEEN THE STRUCTURE OF THE [Ir(сod)Cp] COMPLEX AND ITS THERMAL PROPERTIES

Journal of Structural Chemistry - A volatile iridium(I) complex [Ir(cod)Cp] (cod - 1,5-cyclooctadiene, Cp - cyclopentadienyl) is synthesized and characterized by IR and NMR spectroscopy. The...     

Macroscopic effect of the shadow of the electromagnetic field of relativistic electrons

The effect of the “formation zone” (“shadow” effect) on the characteristics of coherent diffraction radiation from a relativistic electron bunch passing near two conducting targets has been investigated experimentally as a function of the distance between the targets. The effect of the shadow behind absorbing and conducting screens on the diffraction radiation intensity has been studied in the experiments. In both cases, the same decrease in the diffraction radiation intensity almost to zero is observed with a decrease in the distance between the shadow source and target. The results indicate that two interpretations of the observed effect—the formation zone and shadow effect—are not equivalent.     

Structure of A Coordination Polymer [Cu(En)<Subscript>2</Subscript>CrO<Subscript>4</Subscript>]<Subscript><Emphasis Type="Italic">n</Emphasis></Subscript>

The crystal structure of [Cu(En)₂CrO₄]_n (En is ethylenediamine) is determined: a = 14.7359(4) Å, b = 9.8083(3) Å, c = 14.2664(4) Å, V = 2061.98(10) ų, space group Cmce, Z = 8, d_x = 1.931 g/cm³. It is demonstrated that the studied phase is isostructural with [Сu(Еn)₂SO₄]_n. A pseudotetragonal copper atom coordination (Cu–N 2.0204 Å and 2.0244 Å, ∠N–Cu–N 84.73°) is completed to distorted octahedral by two oxygen atoms of chromate anions (Cu–O 2.433 Å and 2.380 Å).     

Molecular Environment Effects That Modulate the Photophysical Properties of Novel 1,3-Phosphinoamines Based on 2,1,3-Benzothiadiazole

We report synthesis, crystal structure, and photophysical properties of novel 1,3-phosphinoamines based on 4-amino-2,1,3-benzothiadiazole (NH₂-btd): Ph₂PCH(Ph)NH-btd (1) and Ph₂P(E)CH(Ph)NH-btd, (E = O (2α and 2β·thf), S (3), Se (4)). Chalcogenides 2–4 exhibit bright emissions with a major band at 519–536 nm and a minor band at 840 nm. According to TD-DFT calculations, the first band is attributed to fluorescence, while the second band corresponds to phosphorescence. In the solid state, room temperature quantum yield reaches 93% in the case of the sulphide. The compounds under study feature effects of the molecular environment on the luminescent properties, which manifest themselves in fluorosolvatochromism as well as in a luminescent response to changes in crystal packing and in contributions to aggregation effects. Specifically, transformation of solid 2β·thf to solvate-free 2β either by aging or by grinding causes crystal packing changes, and, as a result, a hypsochromic shift of the emission band. Polystyrene films doped with 2 reveal a bathochromic shift upon increasing the mass fraction from 0.2 to 3.3%, which is caused by molecular aggregation effects.