The first coordination complex of (5R,6R,7S)-5-(furan-2-yl)-7-phenyl-4,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-amine with zinc(II) acetate-chloride

The title complex, systematic name catena-poly[[[acetatochloridozinc(II)]-μ-(5R,6R,7S)-5-(furan-2-yl)-7-phenyl-4,5,6,7-tetrahydro[1,2,4]triazolo[1,5-a]pyrimidin-6-amine] monohydrate], {[Zn(C2H3O2)Cl(C15H15N5O)]·H2O} n , is the first coordination complex in which the neutral tetrahydrotriazolopyrimidine derivative acts as bridging ligand between two zinc molecules. As a result, polymeric chains of the coordination complex are found. The coordination of the zinc metal atom occurs with the lone pairs of the triazolo nitrogen atom and amino group. The positive charge of the zinc atom is compensated by the chlorine anion and deprotonated acetic acid. The coordination complex exists as a monohydrate in the crystalline phase. The water molecules bind neighbouring polymeric chains by the formation of O—H...O, O—H...Cl and N—H...O hydrogen bonds.

[1,2-Bis(diphenylphosphanyl)ethane-κ2 P,P]chlorido(isonicotinamide-κN)palladium(II) nitrate acetonitrile monosolvate

The PdII central atom in the title complex, [PdCl(C26H24P2)(C6H6N2O)]NO3·CH3CN or [PdCl(dppe)(INAM)]NO3·CH3CN, where dppe is 1,2-bis(diphenylphosphanyl)ethane and INAM is isonicotinamide, exists in a slightly distorted square-planar environment defined by the two P atoms of the dppe ligand, a chloride ligand and the N atom of the isonicotinamide pyridyl ring. The crystal packing in the structure is held together by hydrogen bonds between the amide of the INAM ligand and the nitrate ions that complete the outer coordination sphere. A molecule of acetonitrile is also found in the asymmetric unit of the title complex.

Crystal structure of a TbIII–CuII glycinehydroxamate 15-metallacrown-5 sulfate complex

The core of the title complex, bis[hexaaquahemiaquapentakis(μ3-glycinehydroxamato)sulfatopentacopper(II)terbium(III)] sulfate hexahydrate, [TbCu5(SO4)(GlyHA)5(H2O)6.5]2(SO4)·6H2O (1), which belongs to the 15-metallacrown-5 family, consists of five glycinehydroxamate dianions (GlyHA2−; C2H4N2O2) and five copper(II) ions linked together forming a metallamacrocyclic moiety. The terbium(III) ion is connected to the centre of the metallamacrocycle through five hydroxamate oxygen atoms. The coordination environment of the Tb3+ ion is completed to an octacoordination level by oxygen atoms of a bidentate sulfate and an apically coordinated water molecule, while the copper(II) atoms are square-planar, penta- or hexacoordinate due to the apical coordination of water molecules. Continuous shape calculations indicate that the coordination polyhedron of the Tb3+ ion in 1 is best described as square antiprismatic. The positive charge of each pair of [TbCu5(GlyHA)5(H2O)6.5(SO4)]2 2+ fragments is compensated by a non-coordinated sulfate anion, which is located on an inversion center with 1:1 disordered oxygen atoms. Complex 1 is isomorphous with the previously reported compounds [LnCu5(GlyHA)5(SO4)(H2O)6.5]2(SO4), where Ln III = Pr, Nd, Sm, Eu, Gd, Dy and Ho.

Peculiarities of the Compositional Structure of the Text of the English-Language Academic Lecture

The academic lecture is considered to be one of the basic genres of modern English-language academic discourse. The study of the compositional structure of the lecture text is extremely important, since a correctly arranged composition contributes to a better presentation of the topic by the lecturer and systemic learning of the material by the students. The purpose of this research was to identify the compositional features of the text of the English-language academic lecture. To achieve this goal, eight English-language lectures on the humanities were selected and carefully analysed. In the course of the analysis, phases of the lecture were singled out, the hierarchy of its elements was revealed, and the composition matrix of the lecture text was built. The main compositional elements of the lecture are as follows: the pre-text part (title complex), the text part (introduction, body, and conclusion) and the aftertext part (references and expression of gratitude for attention). As a result, the author proved that the lecture text has a matrix structure, whose elements are nonuniform, each being designed to perform its own specific function. The compositional-semantic structure of the lecture captures the movement from the “old” knowledge to the “new”. Further, English-language lectures demonstrate both strong and weak positions. This means that some elements in the text are more important than others. At the same time, the strong position does not have to be rigidly connected with the structure of the text. The following are regarded as strong positions: title of the lecture, names of its subsections, beginning and end of subsections, introductory and closing parts of the lecture, conclusions, semantic repetitions of key information, questions-and-answers part, and in-text references.

THE TITLE AS A PROBLEM OF HISTORICAL POETICS

An analysis of the works devoted to the poetics of the title demonstrates that although the majority of facts are presented correctly, the lack of a systematic approach and the required historical perspective makes the explanation of their origin completely unsatisfactory. It actualizes the need to review all the discovered facts in the history of the title as a form of the author’s reflection on the text framework in the context of historical poetics. Periodization of historical poetics in the terminology proposed by S. S. Averintsev demonstrates that the title is absent in the period of pre-reflexive traditionalism and appears only when moving to the next period, namely, reflexive traditionalism. The most archaic titles include the widely understood genre and theme of the text. Later, the title transforms into merely a name; common titles with predication occur sporadically. During the Renaissance, the title may have acquired a conditional character (numerical name), and the identification of the text was carried out through the development of the predicative part, which annotated the text and was sometimes of a promotional nature. The title in its modern form emerges during the transition from reflexive traditionalism to the anti-traditionalist tendencies of the bourgeois era. In the 19th century, the abstract becomes an independent genre and breaks away from the title, while the author, who was initially in the last position, subsequently moved to the first in the title complex (book name, genre, author).

Bis(pyridine-2-carboxylato-κ2 N,O)copper(II)]–benzene-1,3,5-tricarboxylic acid–water (1/2/2)

In the title complex, [Cu(C6H4O2N)2]·2C9H6O6·2H2O, the Cu2+ ion lies on a center of inversion and coordinates with symmetry related pyridine nitrogen and carboxyl oxygen atoms from two pyridine-2-carboxylic acid anions, giving rise to a square-planar coordination geometry. There are weak axial bonds between Cu and an O atom of a symmetry-related trimesic acid moieties [Cu...O = 2.837 (2) Å] The Cu...O weak interactions and hydrogen bonds stabilize the whole structure.

TRUTH AS AN AXIOLOGICAL DOMINANT (V. M. SHUKSHIN IN A RETROSPECTIVE OF RUSSIAN LITERATURE)

The concept of “truth” in Russian literature is historically associated with justice, righteousness, truth and fairness. In the second half of the 19th century, this concept was actualized in the works of F. M. Dostoevsky, L. N. Tolstoy, and A. P. Chekhov. In Dostoevsky's “ideological novel,” the emphasis is on the hero's finding “truth-verity,” “to live according to the truth” means to live with Christ. Besides the “truth of God”, the “truth of the people” is also of great importance in Dostoevsky's axiology. It is the people who carry the ideal of Christ in their hearts. The writer also discusses the truth of everyday life in his work: in politics, in the relationships among people in society. Leo Tolstoy created a whole gallery of characters who live “according to the truth.” First and foremost, the works of A. P. Chekhov reveal the truth of life; the writer is interested in the character's existential choice. God's truth and the people's truth, as a rule, are revealed to him in the self-awareness of a character "of the people." In 20th century Russian literature, the concept of “truth” plays an important role in the work of V. M. Shukshin and other rustic writers. Shukshin suggests distinguishing between truthfulness and truth, the truth of character and the truth of action. The truth of life involves the problem of the meaning of life. According to Shukshin, “people know the truth,” and this is not rational knowledge, but a way of life. The truth becomes the basis of national existence. Shukshin's Pravda was provocative in relation to the aesthetics of socialist realism with its main principle of partisanship. The writer relied on Russian axiology, rather than on party attitudes. The concept of “truth,” which is associated with the Christian worldview and Christian values, is the foundation of Russian culture and determines the main vectors of its development.

Crystal structure and Hirshfeld surface analysis of ((S,S)-2,2′-{[(1,2-diphenylethane-1,2-diyl)bis[(azaniumylylidene)methanylylidene]}bis(6-methoxyphenolato))trinitratosamarium(III)

In the title complex, [Sm(NO3)3(C30H28N2O4)], the Sm atom is surrounded by ten O atoms. The (S,S)-2,2′-{[(1,2-diphenylethane-1,2-diyl)bis[(azaniumylylidene)methanylylidene]}bis(6-methoxyphenolate) ligand, obtained from o-vanillin and (1S,2S)-(−)-1,2-diphenylethylenediamine, exhibits a slightly distorted planar arrangement of the four coordinated O atoms. In the crystal, the complex shows intramolecular N—H...O hydrogen bonds and weak intermolecular C—H...O hydrogen bonds. The Hirshfeld surface analysis indicates that the most important contributions to the packing are from H...H (33.5%), O...H (34.1%) and C...H (21.7%) contacts.

Crystal structure of cis-(1,4,8,11-tetraazacyclotetradecane-κ4 N)bis(thiocyanato-κN)chromium(III) bromide from synchrotron X-ray diffraction data

The crystal structure of the title complex, cis-[Cr(NCS)2(cyclam)]Br (cyclam = 1,4,8,11-tetraazacyclotetradecane, C10H24N4), has been determined from synchrotron X-ray data. The asymmetric unit contains one [Cr(NCS)2(cyclam)]+ cation and one bromide anion. The CrIII ion of the complex cation is coordinated by the four N atoms of the cyclam ligand and by two N-coordinating NCS groups in a cis arrangement, displaying a distorted octahedral coordination sphere. The Cr—N(cyclam) bond lengths are in the range 2.075 (3) to 2.081 (3) Å while the average Cr—N(NCS) bond length is 1.996 (16) Å. The macrocyclic cyclam moiety adopts the most stable cis-V conformation. The crystal structure is stabilized by intermolecular hydrogen bonds involving the cyclam N—H groups as donor groups, and the bromide anion and the S atom of one of the NCS ligands as acceptor groups.

Dichlorido(pyridine-κN)[2,3,5,6-tetrakis(pyridin-2-yl)pyrazine-κ3 N 2,N 1,N 6]nickel(II)

In the title complex, [NiCl2(C5H5N)(C24H16N6)], the NiII ion is six-coordinated in a distorted octahedral coordination environment defined by three N atoms of the tridentate 2,3,5,6-tetra-2-pyridylpyrazine ligand, one N atom of the pyridine ligand and two Cl− anions, with the latter being mutually trans. The complex is disposed about a twofold rotation axis along the a axis. The complex molecules are connected in the crystal via C—H...Cl, C—H...N and π–π [closest inter-centroid separation = 3.7446 (14) Å between pyridyl rings].