Isomorphous Structures Research Articles

Modeling and Analyzing Linear Wireless Sensor Networks With Backbone Support

Rapid advancement in micro-electromechanical techniques leads to the wide application of wireless sensor networks (WSNs). In a linear WSN (LWSN), all sensor nodes are arranged in a straight line to monitor health status of some linear infrastructure structure such as bridges, highways, pipelines, etc. To enhance reliability of the infrastructure monitoring services, LWSNs are often designed to incorporate a limited number of backbone nodes for transferring or relaying information, leading to a more complex hybrid structure. In this paper, a multivalued decision diagram (MDD)-based analytical approach is proposed to evaluate performance of an LWSN system with backbone nodes. Particularly, we model and analyze the probability that the hybrid LWSN performs at a particular performance level, which is characterized by the number of sensor nodes being able to reach the base station. A single compact MDD model is constructed by sharing all isomorphic submodel structures involved in different performance levels. The MDD model, once being constructed, can be reused for evaluation using different failure time distributions or mission time. A case study is presented to substantiate the application of the proposed MDD approach for developing the optimal backbone node allocation strategy to guarantee the reliability requirement on the infrastructure monitoring services.

박지원(朴趾源)의 「불이당기(不移堂記)」와 ‘채움’의 수사학 : 액자 구성과 예술 체험 간의 상관성에 주목하여

By a close reading of Park, Ji-Won (朴趾源)’s 不移堂記 (A Monumental Document for the Hall of No-Defection) one will notice the interrelationship between the thematics and the distinctive discursive structure which this text seems to involve. I aimed to investigate the textual conditions showing the semantic relationship between a proper name and its substance, signifying a new house or a pen name, corresponding to its form of frame and the theme; it had already been known as the structural isomorphism.BR The repeating construction of the narrative frames in 不移堂記 brings about the rhetorical effects very strongly which strengthen and harden the argumentative foundation that is the nature of writing of traditional monumental documents in Far East. As the new frame is presented again and again in this text, we, the readers, could identify a character’s whole life progressing forward the growth of his whole person. Here, the function of the framing structure invites us to join his journey of life and to gaze at it from the critical distance.BR On the aspect of the thematic horizon, 不移堂記 widens its basic issue, which has begun from concrete artistic symbols and conventions, as far as it includes the whole artistic act and the value system in the traditional world. With this frame-serial, we can appreciate that the various symbolic signs and codes often employed in the context of the East Asian traditional liberal arts, and the serious interpretive matters in the intellectual community, such as a black-and-white painting by a noble man, has been evolving into the whole system of the art and hermeneutics lying in the traditional world.BR In particular, the narrators in each frame show that they turn the conventional code and interpretation into their own intrinsic meaning through the thorough reforming of character by their own experience; it designates the procession of inserting a frame into another frame, on the phase of the isomorphic structure. This reflexive usage of framing takes the inner process of self-reflection to the concrete linguistic and discursive form, by the act of art producing as the core virtue of a noble man (君子).BR Therefore, through the framing structure of interactions between the critical distance and the life experience of reforming, 不移堂記 represents the problem of artistic appreciation and communication and that it should be achieved through the devotion of entire lives of the interpreter, the reader as well as the artistic creator.

Lanthanide coordination polymers constructed from the asymmetrical N-heterocyclic rigid carboxylate: Synthesis, crystal structures, luminescence properties and magnetic properties

Three new series of lanthanide coordination polymers [LnL2(H2O)4]n·nNO3 (Ln = Eu (1), Tb (2), Sm (3), Gd (4), Dy (5), Ho (6), Nd (7)), [LnL2(H2O)4]n·nCl (Ln = Yb (8), Er (9), and [LnL(H2O)2(NO3)2]n (Ln = Sm (10), Nd (11)) assembled through an asymmetrical N-heterocyclic rigid carboxylate ligand (HL) were solvothermally constructed. Compounds 1–7, 8, 9 and 10, 11 display three diverse series of isomorphic 1D chain structures. Furthermore, the thermal stabilities and photoluminescence properties of these compounds were also studied. Based on a view that the emissions of 1-Eu and 2-Tb are composed of the three primary colors and they are isostructural, we prepared a series of doped [EuxTb(1-x)L2(H2O)4]n·nNO3 compounds with different doping molar ratios. And the Eu(III)/Tb(III) molar ratio and the excitation wavelengh ([Eu(III)/Tb(III)] = 2:3, 340 nm) were determined to gain the nearly white light emission. Meanwhile, the magnetic properties of 4-Gd, 5-Dy, 6-Ho, 8-Yb, 9-Er were also measured.

Understanding intentionality structure: development of hermeneutics F. Brentano

The author of research points out at philosophical heritage of F. Brentano, famous Austrian philosopher and psychologist considered to be founder of phenomenology. In particular, philosophy of language and theory of intentionality are regarded in connection with development of hermeneutic ideas in the context of phenomenological school.The interaction between this concept and representatives of different linguistic theories of the end of XIX century – the early XX century is shown. The concept of intentionality is presented as key element of process of understanding and interpretation, as criterion of differentiation of mental and physical phenomena, as theoretical and cognitive principle that expresses an orientation to, on the one hand, objective sense of phenomena, and, on the other hand, intention of subject-interpreter.Intentionality becomes fundamental structure of mind that lies deeper than any concrete, local mental state. From the point of view of Brentano, any psychic act is directed at something, what makes it intentional. Such position had a great influence on development of ideas of modern hermeneutics.One more vector of development of hermeneutic problematic is described. This vector connects hermeneutic problematic with couple of the most important theories of given period and directly leads to appearance of E. Husserl’s phenomenology that is an origin of modern hermeneutics. Intentionality is examined as initial model that makes sense of hermeneutic interpretation.Understanding, which is injected in hermeneutic as a basic target, is an isomorphic structure to intentionality. Intentional object with its nature, indifferent to valid existence of a thing, becomes the most important feature of mind and major element of hermeneutic discourse.

Efficient homogeneous and isomorphic blocking layer – Skeleton rutile TiO2 electron transfer structure for quantum dot sensitized solar cells

Abstract Blocking layer and transfer skeleton of the electron transfer layer are found to play a crucial role in devices efficiency improvement. We develop a homogeneous and isomorphic electron transfer structure of rutile TiO2 by preferred orientation growth in a facile two-step hydrothermal synthesis. The aligned TiO2 nanowire array skeleton (TS) about 2.47 μm long grew neatly over the isomorphic ultra-thin blocking layer (BL). Those homogeneous and isomorphic structures promote the charge injection and transfer capability by means of increased driving force by higher Fermi-level and decreased resistance, in which the cell photocurrent and PCE improve significantly. Of the cells with isomorphic transfer structure, the PCE is 2.87%, the short-circuit current (Jsc) is 6.74 mA/cm2, open-circuit voltage (Voc) is 0.91 V and fill factor (FF) is 38.4% under one sun illumination (100 mW/cm2).

Mononuclear Co(III), Ni(II) and Cu(II) complexes of 2‐(2,4‐dichlorobenzamido)‐N'‐(3,5‐di‐tert‐butyl‐2‐hydroxybenzylidene)benzohydrazide: Structural insight and biological assay

A series of mononuclear metal complexes of Co(III), Ni(II) and Cu(II) with 2‐(2,4‐dichlorobenzamido)‐N′‐(3,5‐di‐tert‐butyl‐2‐hydroxybenzylidene)benzohydrazide (LH3) have been synthesized and characterized using various physico‐chemical, spectroscopic and single crystal X‐ray diffraction techniques. Structural studies of [Co(LH)(LH2)]·H2O (4) revealed the presence of both amido and imidol tautomeric forms of LH3, resulting in a distorted octahedral geometry around the Co(III) ion. [Ni(LH)(H2O)]·H2O (5) and [Cu(LH)(H2O)]·H2O (6) are isomorphous structures and crystallize in the monoclinic P21/c space group. The crystal structures of 4, 5 and 6 are stabilized by hydrogen bonds formed by the enclathrated water molecules, C‐H···π and π···π interactions. Complexes along with the ligand (LH3) were screened for their in vivo anti‐inflammatory activity (carrageenan‐induced rat paw edema method) and in vitro antioxidant activity (DPPH free radical scavenging assay). Metal complexes have shown significant anti‐inflammatory and antioxidant potential.

Organic Three‐Component Single Crystals with Pseudo‐Isomorphic Cocrystallization for Nonlinear Optics and THz Photonics

AbstractA new organic three‐component single crystals are developed using the so‐called “pseudo‐isomorphic cocrystallization” for nonlinear optical and terahertz (THz) photonic applications. The pseudo‐isomorphic cocrystallization is based on two homocrystals exhibiting similar molecular ordering feature in the crystalline state, but different crystallographic space groups. Such new organic cocrystals consist of three components, highly nonlinear optical 2‐(4‐hydroxystyryl)‐1‐methylquinolinium (OHQ) cation, and two different counter anions. Compared to homocrystals having two components (OHQ cation and a single anion type), OHQ‐based cocrystals by isomorphic cocrystallization from isomorphic homocrystals exhibit an isomorphic crystal structure with very similar physical properties. In contrast, OHQ‐based cocrystals by pseudo‐isomorphic cocrystallization provide a different molecular ordering with a different crystallographic space group, resulting in remarkably distinguishable crystal characteristics and physical properties, while maintaining large macroscopic optical nonlinearity with excellent optical quality and morphology suitable for diverse optical experiments. To show a potential for nonlinear optical applications, THz wave generation is demonstrated by optical rectification pumped at fundamental wavelength of 1300 nm. A 0.92 mm thick OHQ‐based cocrystal by pseudo‐isomorphic cocrystallization delivers efficient optical‐to‐THz conversion with one order of magnitude higher peak‐to‐peak THz electric field than the 1.0 mm thick inorganic standard ZnTe crystal and presents a broad spectral bandwidth of up to 8 THz.

ОСОБЕННОСТИ СУБЪЕКТНОЙ АРХИТЕКТОНИКИ ВЕНКА СОНЕТОВ В ПОЭЗИИ Р. БУХАРАЕВА

In the article, by the material of R. Bukharaev’s crown of sonnets “The Beetle and the Toad” and “The Call”, the author reveals the principles that form the artistic integrity of the sonnet cycles in the poet’s work: the successive “chain” connection of isomorphic stanzaic structures and the concentric development of the main theme. It is ascertained that the subject architectonics of Bukharaev’s sonnet cycles is determined by the relation of the lyric hero and super-subjects of a special type: the life-creative element of the language (“The Beetle and the Toad”), the Motherland and Venice (“The Call”). The dialogue of “I” with this over-the-horizon point of view fulfills the structure-forming function, revealing the self-consciousness and self-determination of the lyric subject.

A test of construct isomorphism of the Belief in a Zero-Sum Game scale: A multilevel 43-nation study.

BackgroundWe examined the equivalence of the individual and the country-level factor structure of the Belief in a Zero-Sum Game (BZSG) scale, a tool designed to measure antagonistic beliefs about social relations (i.e., perceived social antagonism) in the struggle for limited resources.AimsIn this article we focused on a test of construct isomorphism in a multilevel modeling approach. It was hypothesized that the BZSG measure satisfies all requirements for a strong level of configural isomorphism, and thus that it is useful to investigate BZSG at both the individual and the country levels. The relationships between the BZSG at a country level with other macro-socio-economic indicators were also investigated.MethodMultilevel confirmatory factor analysis (MCFA) was carried out on a cross-country sample composed of 11,368 participants from 43 different countries. We also used the country-level latent BZSG factor in each country as an indicator of a property that we attributed to a particular culture: cultural dimension (collectivism-individualism), macroeconomic indicators (GDP per capita and GNI per capita) and macrosocial indicators (Human Development Index and Democracy Index) describing societies.ResultsThe results revealed an isomorphic factor structure of perceived social antagonism (measured by BZSG scale), defined in terms of the equivalence factor structure at the both individual and country levels. Furthermore, the relationship between the perceived social antagonism, gross national income per capita, and collectivism were confirmed.ConclusionsOur study supports the usefulness of the BZSG scale for cross-cultural comparison, in the case of its isomorphic structure. At the country level, antagonistic beliefs emerge in hierarchical collectivist societies with lower income. The main contribution of this article is the presentation of the test of construct isomorphism. We made an effort to present a full perspective on construct isomorphism putting together two different but very recent approaches.

Study of materials structure physics of isomorphic LiNbO3 and LiTaO3 ferroelectrics by synchrotron radiation X-ray diffraction

Electron charge density studies of stoichiometric LiNbO3 and LiTaO3 ferroelectrics have been carried out by analyzing the synchrotron radiation X-ray powder diffraction data using a combination of the Rietveld and maximum entropy methods. The clear relationships between the Nb(Ta)–O bond length, the electron charge density on the Nb(Ta)–O bond, and the phase transition temperature TC are revealed for isomorphic structures. Nb(Ta)–O bonding plays an important role in the elevation of TC. The TC in LiNbO3 being higher than that in LiTaO3 is attributed to the larger lattice distortion of the Nb–O oxygen octahedron in LiNbO3. The validity of estimating TC for LiNbO3 family crystals from the degree of lattice distortion in the ferroelectric structure is discussed.

Colloids of Holey Gd2 O3 Nanosheets Converted from Exfoliated Gadolinium Hydroxide Layers.

This paper proposes a confined solid-state conversion approach using layered metal-hydroxides for the production of a colloidal suspension of porous 2D crystalline metal oxide layers with superior electrochemical H2 O2 sensing performance. This study investigates the conversion chemistry of delaminated layers of gadolinium hydroxide (LGdH), [Gd2 (OH)5 ]+ , encapsulated in a silica nanoshell that provides an antistacking and antisintering environment during the phase-transition at high temperature. Thermal treatment of the LGdH layers within the protected environment results in a dimensionally confined phase-transition into crystalline Gd2 O3 nanosheets with an isomorphic 2D structure. Furthermore, annealing at higher temperatures leads to the evolution of in-plane mesoporous structure on the Gd2 O3 nanosheet. Based on insight acquired from in-depth investigation, the evolution of in-plane porosity proceeds through the in-plane dominant silicate-formation reaction at the interface with the surrounding silica shell. Their 2D-anisotropic and mesoporous morphological features are preserved, producing a colloidal suspension of holey nanosheets that can be used to fabricate a thin and porous film through wet-coating deposition. This study also demonstrates the superior electrochemical H2 O2 sensing ability of the resultant porous Gd2 O3 film, which represents a ≈1000- and 10-fold enhancement of the detection limit and sensitivity, respectively, in comparison to previously reported Gd2 O3 films.

Exploring Alternative Pathways to Institutional Field Development and Change

As organizational fields have grown more dynamic, structurally diverse, complex and heterogeneous in membership, the accelerated pace of field transformation has spurred formation of new fields, created new entrepreneurial opportunities, and enabled social innovation to solve grand challenges. Yet despite a shift in scholarly study from structural and normative isomorphism to complexity, conflict and agency, we lack robust understanding of what triggers change and the mechanisms by which fields are transformed. This symposium gathers four perspectives on the processes involved in how fields change, develop, decline and reinstitutionalize, in entrepreneurial contexts relevant to grand challenges and wicked problems. In discussion with a seminal thinker in theorizing about fields, the authors’ emergent theorizing is linked with more traditional and contemporary perspectives, illuminating a forward-looking path for scholarship that leads to deeper understanding of factors shaping field trajectories. Maintenance Work in Cross-Sector Partnerships: Frame Plurality Key to Solving Complex Social Issue Presenter: Shahzad Ansari; Cambridge U. Field-Convening Organizations:Shaping Standards in the Emerging Field of Human Genomics Presenter: Celeste Diaz Ferraro; Pennsylvania State U. Presenter: Forrest Briscoe; Pennsylvania State U. Presenter: Barbara Gray; Pennsylvania State U. Under No Circumstances Is the Hybrid to Be Accepted: Social Cohesion & Emergence of Hybrid EV Tech Presenter: Byungchae Jin; Korea Advanced Institute of Science and Technology (KAIST) Presenter: David A. Kirsch; U. of Maryland Presenter: Wesley Sine; Cornell U. How Controversy in Adjacent Fields Shaped Emerging Narratives & Practices in Japanese Whale-Watchi Presenter: Jean-Baptiste Litrico; Smith School of Business, Queen's U. Presenter: Jesper Edman; Waseda U.

Luminescent Properties of Twelve Novel MOFs Based on 2,7-Bis(4-benzoic acid)-N-(4-benzoic acid)Carbazole and Their Application in Ni2+ Ions Concentration Sensing and Vis-NIR Fluorescent Materials

I will present twelve novel luminescent metal-organic frameworks, TCZ-001 – TCZ-005 and TCZ-M (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho). All of the twelve MOFs were assembled from a novel luminescent carbazole-based ligand, 2,7-bis(4-benzoic acid)-N-(4-benzoic acid)carbazole. TCZ-001, TCZ-003 and TCZ-004 show a remarkable response to the Ni2+ concentration in DMA, H2O or EtOH. Some of Zn2+ ions were replaced by Ni2+ ions and the rate of the transmetalation depended on the concentration of Ni2+ ions. Also, changing part of the metal node would transform the colour of emitted light. Additionally, the colour of the luminescence displays a linear correlation with the Ni2+ concentration range from 0.005 M to 0.35 M (mol·L−1). Besides selective sensing of Ni2+, TCZ-004 can also be utilized to detect Eu3+ ions in DMA solution. Thus, several potential sensory probe materials for Ni2+ and Eu3+ detection in DMA solution have been obtained. As to TCZ-M (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho), X-ray crystallography showed that all of them are isomorphous and possess a 3,6-connected three-dimensional (3D) framework with a point symbol of {4·62}2·{42·610·83}. The photoluminescence measurement indicates that TCZ-Eu shows reddish-orange emission bands and TCZ-Sm shows both visible and near-infrared (NIR) emission bands. In addition, the isomorphous structure of TCZ-M (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho) provide the potential to fabricate multicolour luminescent materials. [1] D.-H. Chen, L. Lin, T.-L. Sheng, Y.-H. Wen, S.-M. Hu, R.-B. Fu, C. Zhuo, H.-R. Li and X.-T. Wu, CrystEngComm, 2017, 19, 2632. [2] D.-H. Chen, L. Lin, T.-L. Sheng, Y.-H. Wen, X.-Q. Zhu, L.-T. Zhang, S.-M. Hu, R.-B. Fu and X.-T. Wu, New J. Chem., 2018, 42, 2830.

Lie isomorphisms of reflexive algebras. II

By characterizing minimal non-central Lie ideals, we describe the structure of Lie isomorphisms of reflexive algebras with J-subspace lattices. This result can apply to reflexive algebras with atomic Boolean subspace lattices or with pentagon subspace lattice algebras.

Univalence as a principle of logic

It is sometimes convenient or useful in mathematics to treat isomorphic structures as the same. The recently proposed Univalence Axiom for the foundations of mathematics elevates this idea to a foundational principle in the setting of homotopy type theory. It provides a simple and precise way in which isomorphic structures can be identified. We explore the motivations and consequences, both mathematical and philosophical, of making such a new logical postulate.

Hydrogen bonding and fluorous weak interactions in the non-isomorphous {4,4'-bis[(2,2,3,3-tetrafluoropropoxy)methyl]-2,2'-bipyridine-κ2N,N'}dibromidopalladium and -platinum complexes.

The polyfluorinated title compounds, [MBr2(C18H16F8N2O2)] or [4,4'-(HCF2CF2CH2OCH2)2-2,2'-bpy]MBr2, (1) (M = Pd and bpy is bipyridine) and (2) (M = Pt), have -CH(α)2OCH(β)2CF2CF2H side chains with methylene H-atom donors at the α and β sites, and methine H-atom donors at the terminal sites, in addition to aromatic H-atom donors. In contrast to the original expectation of isomorphous structures, (1) crystallizes in the space group C2/c and (2) in P21/n, with similar unit-cell volumes and Z = 4. The asymmetric unit of (1) is one half of the molecule, which resides on a crystallographic twofold axis. Both (1) and (2) display stacking of the molecules, indicating a planar (bpy)MBr2 skeleton in each case. The structure of (1) exhibits columns with C-H(β)...Br hydrogen bonds between consecutive layers which conforms to a static (β,β) linkage between layers. In the molecular plane, (1) shows double C-H(α)...Br hydrogen bonds self-repeating along the b axis, the planar molecules being connected into infinite belts. Compound (2) has no crystallographic symmetry and forms π-dimer pairs as supermolecules, which then stack parallel to the a axis. The π-dimer-pair supermolecules exhibit (Pt-)Br...Br(-Pt) contacts [3.6937 (7) Å] to neighbouring π-dimer pairs crosslinking the columns. The structure of (2) reveals many C-H...F(-C) interactions between F atoms and aromatic C-H groups, in addition to those between F atoms and methylene C-H groups.

Syntheses, structures and properties of three chiral metal–organic coordination polymers based on (R)-4-(4-(1-carboxyethoxy)phenoxy)-3-nitrobenzoic acid

Three chiral metal–organic coordination polymers (CCPs) [Co(L)(bimb)] (1), [Cd(L)(bimb)] (2), [Zn(L)(bimb)] (3), (L = (R)-4-(4-(1-carboxyethoxy)phenoxy)-3-nitrobenzoic acid; bimb = 4,4′-bis((1H-imidazol-1-yl)methyl)-1,1′-biphenyl) have been successfully obtained via solvothermal reactions. The isomorphic 2D sq1 type network structures of CCPs 1–3 were determined by single-crystal X-ray diffraction analysis and further characterized by elemental analyses, IR, PXRD, TGA and circular dichroism (CD) spectra. Crystallized in chiral space group, CCPs 1–3 exhibit obvious Cotton effects in CD spectra and are proved to be second-harmonic generation (SHG) active. CCPs 1–3 also exhibit luminescence properties, the intensities of which could be affected by some metal cations, especially Fe3+. The Fe3+ sensing and photo catalytic properties toward methylene blue (MB) were also studied.

Isomorphous rare-earth tris[bis(2,6-diisopropylphenyl) phosphate] complexes and their catalytic properties in 1,3-diene polymerization and in the inhibited oxidation of polydimethylsiloxane.

Crystals of mononuclear tris[bis(2,6-diisopropylphenyl) phosphato-κO]pentakis(methanol-κO)lanthanide methanol monosolvates of lanthanum, [La(C24H34O4P)3(CH3OH)5]·CH3OH, (1), cerium, [Ce(C24H34O4P)3(CH3OH)5]·CH3OH, (2), and neodymium, [Nd(C24H34O4P)3(CH3OH)5]·CH3OH, (3), have been obtained by reactions between LnCl3(H2O)n (n = 6 or 7) and lithium bis(2,6-diisopropylphenyl) phosphate in a 1:3 molar ratio in methanol media. Compounds (1)-(3) crystallize in the monoclinic P21/c space group and have isomorphous crystal structures. All three bis(2,6-diisopropylphenyl) phosphate ligands display a κO-monodentate coordination mode. The coordination number of the metal atom is 8. Each [Ln{O2P(O-2,6-iPr2C6H3)2}3(CH3OH)5] molecular unit exhibits four intramolecular O-H...O hydrogen bonds, forming six-membered rings. The unit forms two intermolecular O-H...O hydrogen bonds with one noncoordinating methanol molecule. All six hydroxy H atoms are involved in hydrogen bonding within the [Ln{O2P(O-2,6-iPr2C6H3)2}3(CH3OH)5]·CH3OH unit. This, along with the high steric hindrance induced by the three bulky diaryl phosphate ligands, prevents the formation of a hydrogen-bond network. Complexes (1)-(3) exhibit disorder of two of the isopropyl groups of the phosphate ligands. The cerium compound (2) demonstrates an essential catalytic inhibition in the thermal decomposition of polydimethylsiloxane in air at 573 K. Catalytic systems based on the neodymium complex tris[bis(2,6-diisopropylphenyl) phosphato-κO]neodymium, (3'), which was obtained as a dry powder of (3) upon removal of methanol, display a high catalytic activity in isoprene and butadiene polymerization.

Three new dihydro-β-agarofuran sesquiterpenes from the seeds of Maytenus boaria.

As part of a project studying the secondary metabolites extracted from the Chilean flora, we report herein three new β-agarofuran sesquiterpenes, namely (1S,4S,5S,6R,7R,8R,9R,10S)-6-acetoxy-4,9-dihydroxy-2,2,5a,9-tetramethyloctahydro-2H-3,9a-methanobenzo[b]oxepine-5,10-diyl bis(furan-3-carboxylate), C27H32O11, (II), (1S,4S,5S,6R,7R,9S,10S)-6-acetoxy-9-hydroxy-2,2,5a,9-tetramethyloctahydro-2H-3,9a-methanobenzo[b]oxepine-5,10-diyl bis(furan-3-carboxylate), C27H32O10, (III), and (1S,4S,5S,6R,7R,9S,10S)-6-acetoxy-10-(benzoyloxy)-9-hydroxy-2,2,5a,9-tetramethyloctahydro-2H-3,9a-methanobenzo[b]oxepin-5-yl furan-3-carboxylate, C29H34O9, (IV), obtained from the seeds of Maytenus boaria and closely associated with a recently published relative [Paz et al. (2017). Acta Cryst. C73, 451-457]. In the (isomorphic) structures of (II) and (III), the central decalin system is esterified with an acetate group at site 1 and furoate groups at sites 6 and 9, and differ at site 8, with an OH group in (II) and no substituent in (III). This position is also unsubstituted in (IV), with site 6 being occupied by a benzoate group. The chirality of the skeletons is described as 1S,4S,5S,6R,7R,8R,9R,10S in (II) and 1S,4S,5S,6R,7R,9S,10S in (III) and (IV), matching the chirality suggested by NMR studies. This difference in the chirality sequence among the title structures (in spite of the fact that the three skeletons are absolutely isostructural) is due to the differences in the environment of site 8, i.e. OH in (II) and H in (III) and (IV). This diversity in substitution, in turn, is responsible for the differences in the hydrogen-bonding schemes, which is discussed.

ЕКОНОМІЧНИЙ КОНТРОЛЬ СИЛАМИ ГРОМАДЯНСЬКОГО СУСПІЛЬСТВА: ІНСТИТУЦІОНАЛЬНИЙ ПІДХІД

The article studies the significance of public institutions for successful functioning of a market economy. The emphasis is placed on the fact that market institutions are formed through social organization and evolution. The structure of modern society is clarified; combination of professional performance of the functions of its social group and adherence to moral values are selected to be the main criterion of the structure. The hypothesis of isomorphism of the social structure is advanced, according to which the decrease in the share of people in civil society with rent-seeking behavior can lead to similar shifts in business and public sector. The system of economic control is proposed that corresponds to division of society into three main social groups. The new content of control, which proceeds from the concept of sustainable development and the theory of systems, is revealed. The essence of the new type of control is formation of socially significant analytical information capable of launching mechanisms of self-organization of enterprises, including self-control. The main corrective tool is the publication of these findings. Attention is paid to original sources of information for civil control (for example, financial and tax reporting of enterprises), which is not a commercial secret in accordance with Ukrainian legislation. Institutional mechanisms, such as compulsory mechanism of the law, normative mechanism of professional opinion, imitative mechanism of positive practice, promotion of information, involvement of supporters and cooperation with foundations are listed. It is concluded that the introduction of economic control by civil society can strengthen public institutions such as law, morality, property, enterprise, trust in society, fair competition, etc. This, most likely, will have a positive impact on development of the economy.