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Zeitschriftenartikel zum Thema „Supramolecular level“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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1

Credi, Alberto, Belén Ferrer Ribera und Margherita Venturi. „From supramolecular electrochemistry to molecular-level devices“. Electrochimica Acta 49, Nr. 22-23 (September 2004): 3865–72. http://dx.doi.org/10.1016/j.electacta.2003.12.063.

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2

Eckel, Rainer, Robert Ros, Bj�rn Decker, Jochen Mattay und Dario Anselmetti. „Supramolecular Chemistry at the Single-Molecule Level“. Angewandte Chemie International Edition 44, Nr. 3 (07.01.2005): 484–88. http://dx.doi.org/10.1002/anie.200461382.

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3

Lin, Huirong, Shuang Li, Junqing Wang, Chengchao Chu, Yang Zhang, Xin Pang, Peng Lv et al. „A single-step multi-level supramolecular system for cancer sonotheranostics“. Nanoscale Horizons 4, Nr. 1 (2019): 190–95. http://dx.doi.org/10.1039/c8nh00276b.

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A multi-level supramolecular system produced by single-step Fe³⁺-mediated ionic crosslinking self-assembly can overcome the critical issues of current sonodynamic therapy (SDT) and address the need to monitor therapeutic effects in vivo with a non-invasive approach.

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4

Schäfer, Christian, Björn Decker, Matthias Letzel, Francesca Novara, Rainer Eckel, Robert Ros, Dario Anselmetti und Jochen Mattay. „On the way to supramolecular photochemistry at the single-molecule level“. Pure and Applied Chemistry 78, Nr. 12 (01.01.2006): 2247–59. http://dx.doi.org/10.1351/pac200678122247.

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Two examples of artificial supramolecular host-guest systems derived from resorc[4]arenes (calix[n]arenes based on resorcinol) and ammonium ions as guests have been studied by atomic force microscopy (AFM). For the first time, real single-molecule events have been determined for this type of supramolecular complexes and off-rates as well as molecular parameters of single-molecule aggregates such as the depths of the binding pocket (molecular length parameter) could be measured by applying the methods of dynamic force spectroscopy. In addition, this technique was also applied to differentiate between the two states (open and closed) of a photoswitchable resorc[4]arene-anthracene tweezer. An investigation of the exchange rates of various complexes in the gas phase by means of Fourier transform ion cyclotron resonance (FTICR) mass spectrometry confirmed the results of the AFM study.

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5

Dawn, Arnab. „Supramolecular Gel as the Template for Catalysis, Inorganic Superstructure, and Pharmaceutical Crystallization“. International Journal of Molecular Sciences 20, Nr. 3 (12.02.2019): 781. http://dx.doi.org/10.3390/ijms20030781.

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A supramolecular gel is a fascinating combination of flexibility and orderliness. While the supramolecular nature of crosslinking contributes towards the adaptivity and the reversibility of the system, orderliness at the molecular level amplifies the functional output and induces extraordinary selectivity into the system. Therefore, use of supramolecular gels as the soft template is an emerging area of research, which includes but not limited to catalysis of a chemical or a photochemical process, transcription of gel property to a substrate, or even controlling the nucleation of drug molecules. This review aims to highlight the template effect of supramolecular gels in the above-mentioned areas relevant to novel fundamental chemistry, technology, and healthcare.

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6

Shestimerova, T. A., M. A. Bykov, Z. Wei, E. V. Dikarev und A. V. Shevelkov. „Crystal structure and two-level supramolecular organization of glycinium triiodide“. Russian Chemical Bulletin 68, Nr. 8 (August 2019): 1520–24. http://dx.doi.org/10.1007/s11172-019-2586-0.

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7

Pijper, Dirk, und Ben L. Feringa. „Control of dynamic helicity at the macro- and supramolecular level“. Soft Matter 4, Nr. 7 (2008): 1349. http://dx.doi.org/10.1039/b801886c.

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8

Yang, Lin, Lan She, Jian-Guo Zhou, Ying Cao und Xiao-Ming Ma. „Interaction of lysozyme during calcium carbonate precipitation at supramolecular level“. Inorganic Chemistry Communications 9, Nr. 2 (Februar 2006): 164–66. http://dx.doi.org/10.1016/j.inoche.2005.05.026.

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9

Wei, Chengpeng, Mingyang Liu, Yifei Han, Hua Zhong und Feng Wang. „Supramolecular Chirogenesis Engineered by Pt(II)···Pt(II) Metal–Metal Interactions“. Organic Materials 03, Nr. 02 (April 2021): 274–80. http://dx.doi.org/10.1055/a-1512-5965.

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Supramolecular chirogenesis represents an effective way to induce chirality at the supramolecular level. For the previous host–guest chirogenic systems, metal–ligand coordination, hydrogen bonding, π–π stacking and hydrophobic interactions have been mainly employed as the non-covalent driving forces. In this study, Pt(II)···Pt(II) metal–metal interactions have been engineered to induce supramolecular chirogenesis, by forming non-covalent clipping structures between chiral platinum receptors and achiral platinum guests together. This results in the emergence of Cotton effects in the metal–metal-to-ligand charge transfer region, ascribed to chirality transfer from trans-1,2-diamide cyclohexane unit on chiral receptors to Pt(II)---Pt(II) non-covalent interacting sites. Supramolecular chirogenesis can be further transferred from organic to aqueous solutions, with higher resistance to concentration and temperature variations in the latter medium. Overall, the current study provides new avenues toward supramolecular chirality systems with tailored properties.

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10

Chen, Miao, Weimin Lin, Le Hong, Ning Ji und Hang Zhao. „The Development and Lifetime Stability Improvement of Guanosine-Based Supramolecular Hydrogels through Optimized Structure“. BioMed Research International 2019 (13.06.2019): 1–18. http://dx.doi.org/10.1155/2019/6258248.

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Guanosine is an important building block for supramolecular gels owing to the unique self-assembly property that results from the unique hydrogen bond acceptors and donor groups. Guanosine-derived supramolecular hydrogels have promise in the fields of drug delivery, targeted release, tissue engineering applications,etc.However, the property of poor longevity and the need for excess cations hinder the widespread applications of guanosine hydrogels. Although guanosine-derived supramolecular hydrogels have been reviewed previously by Dash et al., the structural framework of this review is different, as the modification of guanosine is described at the molecular level. In this review, we summarize the development and lifetime stability improvement of guanosine-based supramolecular hydrogels through optimized structure and elaborate on three aspects: sugar modification, base modification, and binary gels. Additionally, we introduce the concept and recent research progress of self-healing gels, providing inspiration for the development of guanosine-derived supramolecular hydrogels with longer lifespans, unique physicochemical properties, and biological activities.

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11

Song, Qiao, Fei Li, Zhiqiang Wang und Xi Zhang. „A supramolecular strategy for tuning the energy level of naphthalenediimide: Promoted formation of radical anions with extraordinary stability“. Chemical Science 6, Nr. 6 (2015): 3342–46. http://dx.doi.org/10.1039/c5sc00862j.

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12

Korzeniewski, Bernard. „Artificial Cybernetic Living Individuals Based on SupraMolecular-Level Organization as Dispersed Individuals“. Artificial Life 17, Nr. 1 (Januar 2011): 51–67. http://dx.doi.org/10.1162/artl_a_00017.

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One of the most characteristic features of spontaneously originating biological systems is that their most fundamental structure and especially functioning is based on molecular-level organization. This property is particularly important when natural living individuals composed of organic compounds of carbon are compared with (hypothetical) artificial living individuals based on metals, plastic, glass, silicon, and so on, whose most basic structural and functional units appear at the supramolecular level. The cybernetic definition of a living individual I proposed previously is used in the present work. I argue that artificial, supramolecular living individuals existing self-dependently in the environment of some distant planet must have the form of dispersed individuals composed of several separate subindividuals that are integrated functionally, but not structurally. These subindividuals would be analogous to such modules of human technical civilization as machines, robots, steelworks, chemical plants, electronic factories, power stations, and mines. Such dispersed individuals would resemble colonies of social insects and moles, which are also composed of separate subindividuals (particular insects and moles) carrying out different specialized functions.

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13

Barthélémy, Philippe, Stephen J. Lee und Mark Grinstaff. „Supramolecular assemblies with DNA* (Special Topic Article)“. Pure and Applied Chemistry 77, Nr. 12 (01.01.2005): 2133–48. http://dx.doi.org/10.1351/pac200577122133.

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Information storage in chemical and biological systems involves recognition processes occurring at the molecular and macromolecular level. The implementation of a "code" can consist of multiple noncovalent interactions, which include hydrogen bonds, π-stacking, hydrophobic interactions, and appropriate molecular and supramolecular architectures. With the double-helical DNA structure stabilized by Watson-Crick hydrogen bond base-pairing and aryl π-π stacking interactions, nature provides to scientists an example of one of the most sophisticated supramolecular systems. Molecular organization using these types of processes has become a very powerful strategy for the construction of well-defined nanostructures. Self-assemblies using noncovalent interactions have been designed to build fibers, membranes, two-dimensional monolayers, hydro, organo gels, etc. This paper highlights the research presented at the workshop entitled DNA Supramolecular Assemblies, which was held in Avignon, France on 5-6 May 2004. In this article, we first focus on the recent progress achieved in the design of supramolecular self-assemblies that mimic the molecular recognition functionalities found with nucleic acids. Second, we present several synthetic-DNA supramolecular assemblies currently developed to transport nucleic acids into cells. The marriage of supramolecular chemistry with nucleic acids as illustrated through examples in this article will open new avenues for designing artificial molecular devices and expand the current repertoire of supramolecular assemblies available.

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14

Zhu, Xuefeng, Yuqian Jiang‡, Dong Yang, Li Zhang, Yuangang Li und Minghua Liu. „Homochiral nanotubes from heterochiral lipid mixtures: a shorter alkyl chain dominated chiral self-assembly“. Chemical Science 10, Nr. 13 (2019): 3873–80. http://dx.doi.org/10.1039/c9sc00215d.

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15

Cooper, James A., Stefan Borsley, Paul J. Lusby und Scott L. Cockroft. „Discrimination of supramolecular chirality using a protein nanopore“. Chemical Science 8, Nr. 7 (2017): 5005–9. http://dx.doi.org/10.1039/c7sc01940h.

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16

Lin, Nai-Bo, You-Hui Lin, Qiao-Ling Huang und Xiang-Yang Liu. „Supramolecular gels and mesoscopic structure“. International Journal of Modern Physics B 32, Nr. 18 (15.07.2018): 1840015. http://dx.doi.org/10.1142/s0217979218400155.

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From the perspective of mesoscale, the formation mechanism of crystal network structure of supramolecular gel, the influence of structure on macroscopic properties, and the design and control of supramolecular gels are reviewed. Crystal network is a key character of the hierarchical structure of the gel, the formations of the basic and multi-level crystal networks are based on the crystal nucleation and growth. The engineering and controlling of the gel structure can be implemented by various stimuli, such as additives, sonication, seeding and thermodynamic driving force, which leads to a controllable performance of the gel. In addition, the methods of characterizing supramolecular gels are systematically summarized, such as rheology, atomic force microscope, scanning tunnel microscope, scanning electron microscope, transmission electron microscope, polarizing optical microscope, X-ray diffraction (XRD), small-angle X-ray scattering, small angle neutron scattering, nuclear magnetic resonance spectroscopy, dynamic light scattering (DLS), etc. Supramolecular gel performance is determined by the hierarchy mesoscopic structures, which can significantly improve the properties of the material. Four factors can be correlated to the structure and performance of material: topology, correlation length, symmetry/ordering and strength of association of crystal networks. According to the more in-depth understanding of mesoscopic supramolecular gels, the research and development of such a material will be pushed to a new stage.

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M., Anju, und Renuka N.K. „Graphene-dye supramolecular assembly for parts per trillion level F− monitoring“. Materials Research Bulletin 110 (Februar 2019): 50–56. http://dx.doi.org/10.1016/j.materresbull.2018.10.010.

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18

Sener, Melih, Johan Strumpfer und Klaus Schulten. „Atomic Level Supramolecular Organization and Function of an Entire Bioenergetic Organelle“. Biophysical Journal 102, Nr. 3 (Januar 2012): 259a. http://dx.doi.org/10.1016/j.bpj.2011.11.1430.

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19

Song, Qiao, Fei Li, Zhiqiang Wang und Xi Zhang. „Correction: A supramolecular strategy for tuning the energy level of naphthalenediimide: promoted formation of radical anions with extraordinary stability“. Chemical Science 6, Nr. 8 (2015): 5088–89. http://dx.doi.org/10.1039/c5sc90039e.

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Correction for ‘A supramolecular strategy for tuning the energy level of naphthalenediimide: promoted formation of radical anions with extraordinary stability’ by Qiao Song et al., Chem. Sci., 2015, 6, 3342–3346.

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20

Lehn, Jean-Marie. „Towards Complex Matter: Supramolecular Chemistry and Self-organization“. European Review 17, Nr. 2 (Mai 2009): 263–80. http://dx.doi.org/10.1017/s1062798709000805.

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Chemistry has developed from molecular chemistry, mastering the combination and recombination of atoms into increasingly complex molecules, to supramolecular chemistry, harnessing intermolecular forces for the generation of informed supramolecular systems and processes through the implementation of molecular information carried by electromagnetic interactions. Supramolecular chemistry is actively exploring systems undergoing self-organization, i.e. systems capable of spontaneously generating well-defined functional supramolecular architectures by self-assembly from their components, on the basis of the molecular information stored in the covalent framework of the components and read out at the supramolecular level through specific molecular recognition interactional algorithms, thus behaving as programmed chemical systems. Supramolecular entities as well as molecules containing reversible bonds are able to undergo a continuous change in constitution by reorganization and exchange of building blocks. This capability defines a Constitutional Dynamic Chemistry (CDC) on both the molecular and supramolecular levels. CDC introduces a paradigm shift with respect to constitutionally static chemistry. It takes advantage of dynamic constitutional diversity to allow variation and selection and thus adaptation. The merging of the features of supramolecular systems – information and programmability; dynamics and reversibility; constitution and structural diversity – points towards the emergence of adaptive chemistry. A further development will concern the inclusion of the arrow of time, i.e. of non-equilibrium, irreversible processes and the exploration of the frontiers of chemical evolution towards the establishment of evolutive chemistry, where the features acquired by adaptation are conserved and transmitted. In combination with the corresponding fields of physics and biology, chemistry thus plays a major role in the progressive elaboration of a science of informed, organized, evolutive matter, a science of complex matter.

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21

Márquez-Gutiérrez, Jesús Roberto, Juan Pablo Mojica-Sánchez, Elizabeth Guadalupe Macias-López, Francisco Javier Martínez-Martínez, Nancy Evelyn Magaña-Vergara und Néstor Mendoza-Muñoz. „Structure–property relationship of novel supramolecular gels based on coumarins“. New Journal of Chemistry 45, Nr. 30 (2021): 13369–79. http://dx.doi.org/10.1039/d1nj01784e.

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22

CHARVET, RICHARD, JONATHAN P. HILL, YONGSHU XIE, YUTAKA WAKAYAMA und KATSUHIKO ARIGA. „RECENT DEVELOPMENTS ON PORPHYRIN ASSEMBLIES“. COSMOS 04, Nr. 02 (November 2008): 141–71. http://dx.doi.org/10.1142/s0219607708000342.

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The porphyrin macrocycle is one of the most frequently investigated functional molecular entities and can be incorporated into advanced functional nanomaterials upon formation of organized nanostructures. Thus, study of the science and technology of porphyrin assemblies has attracted many organic, biological and supramolecular chemists. A wide variety of nanostructures can be obtained by supramolecular self-assembly because the porphyrin moiety is amenable to chemical modifications through thoughtful synthetic design and moderate preparative effort. Some recent developments in porphyrin assembly, obtained through various supramolecular approaches, are briefly summarized. Topics described in this review are classified into four categories: (i) non-specific assemblies; (ii) specific assemblies; (iii) assemblies in organized films; (iv) molecular-level arrangement. We present examples in the order of structural precision of assemblies.

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23

He, Zhenfeng, Wei Jiang und Christoph A. Schalley. „Integrative self-sorting: a versatile strategy for the construction of complex supramolecular architecture“. Chemical Society Reviews 44, Nr. 3 (2015): 779–89. http://dx.doi.org/10.1039/c4cs00305e.

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24

Go, Misun, Heekyoung Choi, Cheol Joo Moon, Jaehyeon Park, Yeonweon Choi, Shim Sung Lee, Myong Yong Choi und Jong Hwa Jung. „Origin of Both Right- and Left-Handed Helicities in a Supramolecular Gel with and without Ni2+ at the Supramolecular Level“. Inorganic Chemistry 57, Nr. 1 (13.12.2017): 16–19. http://dx.doi.org/10.1021/acs.inorgchem.7b02588.

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25

Sang, Yutao, und Minghua Liu. „Symmetry Breaking in Self-Assembled Nanoassemblies“. Symmetry 11, Nr. 8 (25.07.2019): 950. http://dx.doi.org/10.3390/sym11080950.

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The origin of biological homochirality, e.g., life selects the L-amino acids and D-sugar as molecular component, still remains a big mystery. It is suggested that mirror symmetry breaking plays an important role. Recent researches show that symmetry breaking can also occur at a supramolecular level, where the non-covalent bond was crucial. In these systems, equal or unequal amount of the enantiomeric nanoassemblies could be formed from achiral molecules. In this paper, we presented a brief overview regarding the symmetry breaking from dispersed system to gels, solids, and at interfaces. Then we discuss the rational manipulation of supramolecular chirality on how to induce and control the homochirality in the self-assembly system. Those physical control methods, such as Viedma ripening, hydrodynamic macro- and micro-vortex, superchiral light, and the combination of these technologies, are specifically discussed. It is hoped that the symmetry breaking at a supramolecular level could provide useful insights into the understanding of natural homochirality and further designing as well as controlling of functional chiral materials.

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Cringoli, Maria C., Slavko Kralj, Marina Kurbasic, Massimo Urban und Silvia Marchesan. „Luminescent supramolecular hydrogels from a tripeptide and nitrogen-doped carbon nanodots“. Beilstein Journal of Nanotechnology 8 (01.08.2017): 1553–62. http://dx.doi.org/10.3762/bjnano.8.157.

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The combination of different components such as carbon nanostructures and organic gelators into composite nanostructured hydrogels is attracting wide interest for a variety of applications, including sensing and biomaterials. In particular, both supramolecular hydrogels that are formed from unprotected D,L-tripeptides bearing the Phe-Phe motif and nitrogen-doped carbon nanodots (NCNDs) are promising materials for biological use. In this work, they were combined to obtain luminescent, supramolecular hydrogels at physiological conditions. The self-assembly of a tripeptide upon application of a pH trigger was studied in the presence of NCNDs to evaluate effects at the supramolecular level. Luminescent hydrogels were obtained whereby NCND addition allowed the rheological properties to be fine-tuned and led to an overall more homogeneous system composed of thinner fibrils with narrower diameter distribution.

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Wen, Zuwang, Wonbin Kim, Seung Jo Yoo, Chang-Geun Chae, Ho-Bin Seo, In-Gyu Bak, Mohammad Changez und Jae-Suk Lee. „Highly ordered supramolecular structure built from poly(4-(4-vinylphenylpyridine)) and 1,1′-ferrocenedicarboxylic acid via hydrogen bonding“. Polymer Chemistry 11, Nr. 15 (2020): 2666–73. http://dx.doi.org/10.1039/d0py00066c.

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28

Arlegui, Aitor, Bernat Soler, Alex Galindo, Oriol Arteaga, Adolf Canillas, Josep M. Ribó, Zoubir El-Hachemi, Joaquim Crusats und Albert Moyano. „Spontaneous mirror-symmetry breaking coupled to top-bottom chirality transfer: from porphyrin self-assembly to scalemic Diels–Alder adducts“. Chemical Communications 55, Nr. 81 (2019): 12219–22. http://dx.doi.org/10.1039/c9cc05946f.

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29

Walhorn, Volker, Christian Schäfer, Tobias Schröder, Jochen Mattay und Dario Anselmetti. „Functional characterization of a supramolecular affinity switch at the single molecule level“. Nanoscale 3, Nr. 11 (2011): 4859. http://dx.doi.org/10.1039/c1nr10912j.

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30

Velu, Saraswati S., Florent Di Meo, Patrick Trouillas, Juan-Carlos Sancho-Garcia und Jean-Frédéric F. Weber. „Regio- and Stereocontrolled Synthesis of Oligostilbenoids: Theoretical Highlights at the Supramolecular Level“. Journal of Natural Products 76, Nr. 4 (26.02.2013): 538–46. http://dx.doi.org/10.1021/np300705p.

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31

Eremenko, Igor L., Aleksei E. Malkov, Aleksei A. Sidorov, Irina G. Fomina, Grygory G. Aleksandrov, Sergei E. Nefedov, Gennady L. Rusinov et al. „Nano-sized octa-nuclear nickel cationic complex: self-assembly on supramolecular level“. Inorganica Chimica Acta 334 (Mai 2002): 334–42. http://dx.doi.org/10.1016/s0020-1693(02)00856-3.

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32

Jiang, Runsheng, Zheng Xue, Yongjun Li, Zhihong Qin, Yuliang Li und Daoben Zhu. „Controllable Supramolecular Architectures for Modulating Optical Properties on the Molecular Aggregation Level“. European Journal of Organic Chemistry 2014, Nr. 23 (04.07.2014): 5004–9. http://dx.doi.org/10.1002/ejoc.201402460.

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33

D’Urso, Alessandro, Nino Marino, Massimiliano Gaeta, Maria Silvia Rizzo, Domenico Andrea Cristaldi, Maria Elena Fragalà, Sebastiano Pappalardo et al. „Porphyrin stacks as an efficient molecular glue to induce chirality in hetero-component calixarene–porphyrin assemblies“. New Journal of Chemistry 41, Nr. 16 (2017): 8078–83. http://dx.doi.org/10.1039/c7nj00890b.

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Porphyrins act as a sort of “molecular glue” in directional self-assembly of water-soluble multi-component porphyrin–calixarene architectures, allowing transfer of chirality to the supramolecular level.

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34

Jin, Yanmei, Tinghuan Huang, Weiwei Zhao, Xinan Yang, Ye Meng und Peihua Ma. „A study on the self-assembly mode and supramolecular framework of complexes of cucurbit[6]urils and 1-(4-methoxyphenyl)piperazine“. RSC Advances 10, Nr. 61 (2020): 37369–73. http://dx.doi.org/10.1039/d0ra07988j.

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Complexes were formed between the positive charge of the cucurbit[n]uril outer wall and inorganic anions, thus generating self-assemblies with multi-dimensional and multi-level supramolecular frameworks.

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Hu, Wenqi, Hexu Zhang, Peng Cheng, Lan Chen, Zhi Chen, Svetlana Klyatskaya, Mario Ruben, Johannes V. Barth, Kehui Wu und Yi-Qi Zhang. „Creating supramolecular semiregular Archimedean tilings via gas-mediated deprotonation of a terminal alkyne derivative“. CrystEngComm 23, Nr. 44 (2021): 7822–30. http://dx.doi.org/10.1039/d1ce01413g.

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Combining surface-confined reactions with supramolecular self-assembly allows the chemical transformation of simple molecular precursors into higher-level tectons to generate complex tessellations with unique structural and functional properties.

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Grafe, Marianne, Petros Batsios, Irene Meyer, Daria Lisin, Otto Baumann, Martin Goldberg und Ralph Gräf. „Supramolecular Structures of the Dictyostelium Lamin NE81“. Cells 8, Nr. 2 (16.02.2019): 162. http://dx.doi.org/10.3390/cells8020162.

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Nuclear lamins are nucleus-specific intermediate filaments (IF) found at the inner nuclear membrane (INM) of the nuclear envelope (NE). Together with nuclear envelope transmembrane proteins, they form the nuclear lamina and are crucial for gene regulation and mechanical robustness of the nucleus and the whole cell. Recently, we characterized Dictyostelium NE81 as an evolutionarily conserved lamin-like protein, both on the sequence and functional level. Here, we show on the structural level that the Dictyostelium NE81 is also capable of assembling into filaments, just as metazoan lamin filament assemblies. Using field-emission scanning electron microscopy, we show that NE81 expressed in Xenopous oocytes forms filamentous structures with an overall appearance highly reminiscent of Xenopus lamin B2. The in vitro assembly properties of recombinant His-tagged NE81 purified from Dictyostelium extracts are very similar to those of metazoan lamins. Super-resolution stimulated emission depletion (STED) and expansion microscopy (ExM), as well as transmission electron microscopy of negatively stained purified NE81, demonstrated its capability of forming filamentous structures under low-ionic-strength conditions. These results recommend Dictyostelium as a non-mammalian model organism with a well-characterized nuclear envelope involving all relevant protein components known in animal cells.

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Askarov, Ibrahim, Yusup Isaev, Gulnoza Tashtemirova, Sanjar Rustamov, Mahamadzarif Kadirov und Kamoliddin Shadmanov. „Synthesis of complex compounds of the monoammonium salt of glycyrrhizic acid and thiourea“. E3S Web of Conferences 383 (2023): 04023. http://dx.doi.org/10.1051/e3sconf/202338304023.

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With poor (low) solubility in the aquatic environment, highly toxic drugs (aspirin, doxorubicin, daunorubicin, sulfonamides and others), a low level of glycyrrhizic acid (HA) leads to a decrease in the toxicity of drugs and increases their biological activity due to poor solubility in water. The stability constants (stability) and the value of the Gibbs energy of the synthesized supramolecular complex have been calculated, theoretical and experimental research methods were used to determine the conditions for obtaining supramolecular complexes of glycyrrhizic acid and thiourea. These researches were carried out as part of joint work to study the effect of the toxicity of medicines on a living organism, under an interuniversity program between Andijan State University and the Tashkent Pharmaceutical Institute of the Republic of Uzbekistan. The aim of the research is to determine the stability constant (stability) of the synthesized supramolecular complex of the monoammonium salt of glycyrrhizic acid (MASHA) with thiourea and the value of the Gibbs energy. To determine the structure and composition of the resulting supramolecular complex of MASHA with thiourea, UV and IR spectroscopy and the isomolar series method were used.

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Wu, Yuchao, Darshil U. Shah, Chenyan Liu, Ziyi Yu, Ji Liu, Xiaohe Ren, Matthew J. Rowland, Chris Abell, Michael H. Ramage und Oren A. Scherman. „Bioinspired supramolecular fibers drawn from a multiphase self-assembled hydrogel“. Proceedings of the National Academy of Sciences 114, Nr. 31 (10.07.2017): 8163–68. http://dx.doi.org/10.1073/pnas.1705380114.

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Inspired by biological systems, we report a supramolecular polymer–colloidal hydrogel (SPCH) composed of 98 wt % water that can be readily drawn into uniform (∼6-μm thick) “supramolecular fibers” at room temperature. Functionalized polymer-grafted silica nanoparticles, a semicrystalline hydroxyethyl cellulose derivative, and cucurbit[8]uril undergo aqueous self-assembly at multiple length scales to form the SPCH facilitated by host–guest interactions at the molecular level and nanofibril formation at colloidal-length scale. The fibers exhibit a unique combination of stiffness and high damping capacity (60–70%), the latter exceeding that of even biological silks and cellulose-based viscose rayon. The remarkable damping performance of the hierarchically structured fibers is proposed to arise from the complex combination and interactions of “hard” and “soft” phases within the SPCH and its constituents. SPCH represents a class of hybrid supramolecular composites, opening a window into fiber technology through low-energy manufacturing.

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Liu, Cui-Lian, Li-Peng Zhou, Debakanta Tripathy und Qing-Fu Sun. „Self-assembly of stable luminescent lanthanide supramolecular M4L6 cages with sensing properties toward nitroaromatics“. Chemical Communications 53, Nr. 16 (2017): 2459–62. http://dx.doi.org/10.1039/c7cc00189d.

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We report here the first example of concentration-triggered helicate-to-tetrahedron transformation in supramolecular lanthanide edifices, along with their highly efficient and selective luminescence sensing properties toward PA at the ppb level.

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Nesterov, Pavel V., Vladimir V. Shilovskikh, Alexander D. Sokolov, Vladislav V. Gurzhiy, Alexander S. Novikov, Alexandra A. Timralieva, Elena V. Belogub, Nikolay D. Kondratyuk, Nikita D. Orekhov und Ekaterina V. Skorb. „Encapsulation of Rhodamine 6G Dye Molecules for Affecting Symmetry of Supramolecular Crystals of Melamine-Barbiturate“. Symmetry 13, Nr. 7 (23.06.2021): 1119. http://dx.doi.org/10.3390/sym13071119.

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Supramolecular organic systems can be used as a host for the encapsulation of small organic molecules. Here, we chose melamine barbiturate as a robust system capable of supramolecular assembly and the Rhodamine 6G dye entrapment as a guest molecule. The encapsulation of the dye was investigated by UV-visible spectroscopy, SEM and optical fluorescent microscopy while the insight into the crystal structure of the system was obtained by single crystal and powder XRD. For investigation of the system’s properties on a molecular level, the DFT and Classical Molecular Dynamics methods were utilized. Surprisingly, both theoretical and experimental data show not only the successful encapsulation of Rhodamine 6G molecules inside the supramolecular assembly, but also that inclusion of such molecules leads to the drastic improvement in the organic crystal shape. The melamine barbiturate in presence of the Rhodamine 6G molecules tend to form crystals with lesser degree of twinning and higher symmetry in shape than the ones without dye molecules.

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Croitoriu, Alexandra, Aurica P. Chiriac, Alina G. Rusu, Alina Ghilan, Diana E. Ciolacu, Iuliana Stoica und Loredana E. Nita. „Morphological Evaluation of Supramolecular Soft Materials Obtained through Co-Assembly Processes“. Gels 9, Nr. 11 (09.11.2023): 886. http://dx.doi.org/10.3390/gels9110886.

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Low-molecular-weight gelators (LMWGs) are compounds with an intrinsic tendency to self-assemble forming various supramolecular architectures via non-covalent interactions. Considering that the development of supramolecular assemblies through the synergy of molecules is not entirely understood at the molecular level, this study introduced a Fmoc-short peptide and four Fmoc-amino acids as building blocks for the self-assembly/co-assembly process. Hence, we investigated the formation of supramolecular gels starting from the molecular aggregation following two triggering approaches: solvent/co-solvent method and pH switch. The complex morphological analysis (POM, AFM, and STEM) offered an insight into the spontaneous formation of well-ordered nanoaggregates. Briefly, POM and AFM images demonstrated that self-assembled gels present various morphologies like dendrimer, spherulite, and vesicle, whereas all co-assembled supramolecular systems exhibit fibrillar morphologies as a result of the interaction between co-partners of each system. STEM study has confirmed that the molecules interact and join together, finally forming a fibrous network, an aspect seen in both self-assembled and co-assembled gels. XRD allowed the determination of the molecular arrangement. The study emphasized that the Fmoc motif protected the amino groups and facilitated gelation through additional π-π interactions.

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Mason, McKensie L., Tao Lin, Jenae J. Linville und Jon R. Parquette. „Co-assembly of a multicomponent network of nanofiber-wrapped nanotubes“. Nanoscale 14, Nr. 12 (2022): 4531–37. http://dx.doi.org/10.1039/d1nr08508e.

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In this work, we report a strategy to construct a two-component nanostructure comprised of two building blocks that undergo self-sorting assembly at the monomer level followed by a supramolecular association to form a nanofiber-wrapped nanotube.

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Dublin, Steven, Yuri Zimenkov und Vincent P. Conticello. „Engineering responsive mechanisms to control the assembly of peptide-based nanostructures“. Biochemical Society Transactions 37, Nr. 4 (22.07.2009): 653–59. http://dx.doi.org/10.1042/bst0370653.

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Complex biological machines arise from self-assembly on the basis of structural features programmed into sequence-specific macromolecules (i.e. polypeptides and polynucleotides) at the molecular level. As a consequence of the near-absolute control of macromolecular architecture that results from such sequence specificity, biological structural platforms may have advantages for the creation of functional supramolecular assemblies in comparison with synthetic polymers. Thus biological structural motifs present an attractive target for the synthesis of artificial nanoscale systems on the basis of relationships between sequence and supramolecular structure that have been established for native biological assemblies. In the present review, we describe an approach to the creation of structurally defined supramolecular assemblies derived from synthetic α-helical coiled-coil structural motifs. Two distinct challenges are encountered in this approach to materials design: the ability to recode the canonical sequences of native coiled-coil structural motifs to accommodate the formation of structurally defined supramolecular assemblies (e.g. synthetic helical fibrils) and the development of methods to control supramolecular self-assembly of these peptide-based materials under defined conditions that would be amenable to conventional processing methods. In the present review, we focus on the development of mechanisms based on guest–host recognition to control fibril assembly/disassembly. This strategy utilizes the latent structural specificity encoded within sequence-defined peptides to couple a conformational transition within the coiled-coil motifs to incremental changes in environmental conditions. The example of a selective metal-ion-induced conformational switch will be employed to validate the design principles.

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Rancan, Marzio, Jacopo Tessarolo, Maurizio Casarin, Pier Luigi Zanonato, Silvio Quici und Lidia Armelao. „Double Level Selection in a Constitutional Dynamic Library of Coordination Driven Supramolecular Polygons“. Inorganic Chemistry 53, Nr. 14 (08.07.2014): 7276–87. http://dx.doi.org/10.1021/ic500573e.

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Buendía, Julia, Fátima García, Belén Yélamos und Luis Sánchez. „Transfer and amplification of chirality in Phe-based C3-symmetric non-ionic amphiphiles“. Chemical Communications 52, Nr. 57 (2016): 8830–33. http://dx.doi.org/10.1039/c6cc04273b.

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The chiral features provided by the Phe fragment in amphiphiles 1 and 2 are transferred to the supramolecular level to yield enantiomerically enriched helices. Despite the very low degree of cooperativity, an amplification of chirality phenomenon is demonstrated by MR experiments.

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Wang, Na, Xin Huang, Lihang Chen, Jinyue Yang, Xin Li, Jiayuan Ma, Ying Bao, Fei Li, Qiuxiang Yin und Hongxun Hao. „Consistency and variability of cocrystals containing positional isomers: the self-assembly evolution mechanism of supramolecular synthons of cresol–piperazine“. IUCrJ 6, Nr. 6 (09.10.2019): 1064–73. http://dx.doi.org/10.1107/s2052252519012363.

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The disposition of functional groups can induce variations in the nature and type of interactions and hence affect the molecular recognition and self-assembly mechanism in cocrystals. To better understand the formation of cocrystals on a molecular level, the effects of disposition of functional groups on the formation of cocrystals were systematically and comprehensively investigated using cresol isomers (o-, m-, p-cresol) as model compounds. Consistency and variability in these cocrystals containing positional isomers were found and analyzed. The structures, molecular recognition and self-assembly mechanism of supramolecular synthons in solution and in their corresponding cocrystals were verified by a combined experimental and theoretical calculation approach. It was found that the heterosynthons (heterotrimer or heterodimer) combined with O—H...N hydrogen bonding played a significant role. Hirshfeld surface analysis and computed interaction energy values were used to determine the hierarchical ordering of the weak interactions. The quantitative analyses of charge transfers and molecular electrostatic potential were also applied to reveal and verify the reasons for consistency and variability. Finally, the molecular recognition, self-assembly and evolution process of the supramolecular synthons in solution were investigated. The results confirm that the supramolecular synthon structures formed initially in solution would be carried over to the final cocrystals, and the supramolecular synthon structures are the precursors of cocrystals and the information memory of the cocrystallization process, which is evidence for classical nucleation theory.

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Raval, R. „Molecular assembly at surfaces: progress and challenges“. Faraday Discuss. 204 (2017): 9–33. http://dx.doi.org/10.1039/c7fd90072d.

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Molecules provide versatile building blocks, with a vast palette of functionalities and an ability to assemble via supramolecular and covalent bonding to generate remarkably diverse macromolecular systems. This is abundantly displayed by natural systems that have evolved on Earth, which exploit both supramolecular and covalent protocols to create the machinery of life. Importantly, these molecular assemblies deliver functions that are reproducible, adaptable, finessed and responsive. There is now a real need to translate complex molecular systems to surfaces and interfaces in order to engineer 21st century nanotechnology. ‘Top-down’ and ‘bottom-up’ approaches, and utilisation of supramolecular and covalent assembly, are currently being used to create a range of molecular architectures and functionalities at surfaces. In parallel, advanced tools developed for interrogating surfaces and interfaces have been deployed to capture the complexities of molecular behaviour at interfaces from the nanoscale to the macroscale, while advances in theoretical modelling are delivering insights into the balance of interactions that determine system behaviour. A few examples are provided here that outline molecular behaviour at surfaces, and the level of complexity that is inherent in such systems.

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Hosseini-Hashemi, Zahra, Masoud Mirzaei, Ameneh Jafari, Peyman Hosseinpour, Mohammad Yousefi, Antonio Frontera, Mahmoud Lari Dashtbayaz, Mojtaba Shamsipur und Mehdi Ardalani. „Effects of N-oxidation on the molecular and crystal structures and properties of isocinchomeronic acid, its metal complexes and their supramolecular architectures: experimental, CSD survey, solution and theoretical approaches“. RSC Advances 9, Nr. 44 (2019): 25382–404. http://dx.doi.org/10.1039/c9ra05143k.

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A series of new coordination complexes bearing H₂pydco, an O-donor ligand, were synthesized and compared to corresponding complexes with H₂pydc. The molecular and supramolecular structures were investigated using crystallography, solution phase and high level DFT studies.

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Zashchepkina, Victoriya V. „Acute Oral Toxicity of the Supramolecular Complex of Ivermectin“. Russian Journal of Parasitology 14, Nr. 1 (10.03.2020): 59–63. http://dx.doi.org/10.31016/1998-8435-2020-14-1-59-63.

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The purpose of the research is to study the acute oral toxicity of the supramolecular complex of ivermectin. Materials and methods. The object of the study was laboratory animals kept in the vivarium of the All-Russian Scientific Research Institute of Fundamental and Applied Parasitology of Animals and Plants. The preclinical study of the ivermectin complex was carried out in accordance with “Guidelines for the Experimental (Preclinical) Study of New Pharmacological Substances”. To process the experimental data in the study of the supramolecular complex of ivermectin, the method proposed by Litchfield and Wilcoxon modified by Z. Roth was used. Acute oral toxicity was carried out with the administration of a complex of ivermectin and the substance ivermectin into the stomach for control in high doses in white mice and rats with a live weight of 18 and 160–180 g respectively. For each dose, 10 mice and 6 rats were used. The drug was administered once using a gastric tube in a doses from 40 to 350 mg/kg in terms of AS. For 14 days the general condition and behavior of animals, possible death, as well as the manifestation of symptoms of intoxication has been monitored. Results and discussion. As our studies showed, the picture of intoxication in both species (mice and rats) was comparable, and the dependence of the number of dead animals on the administered dose was also revealed. Unlike the substance ivermectin, the toxicity of the supramolecular complex is 3 times lower. The introduction of arabinogalactan into the composition of the drug helps to level the negative effect of AS (ivermectin) in the supramolecular complex preparation on the animal organism. LD50 of ivermectin substance for mice was 82.0, for rats – 165.0 mg/kg, supramolecular complex of ivermectin – 280.0 and 298.0 mg/kg respectively (according to the drug 14500 and 14598 mg/kg). According to GOST 12.1.007-76, the supramolecular complex of ivermectin belongs to hazard class 4.

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Araya-Hermosilla, Esteban, Ignacio Moreno-Villoslada, Rodrigo Araya-Hermosilla, Mario E. Flores, Patrizio Raffa, Tarita Biver, Andrea Pucci, Francesco Picchioni und Virgilio Mattoli. „pH-Responsive Polyketone/5,10,15,20-Tetrakis-(Sulfonatophenyl)Porphyrin Supramolecular Submicron Colloidal Structures“. Polymers 12, Nr. 9 (03.09.2020): 2017. http://dx.doi.org/10.3390/polym12092017.

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In this work, we prepared color-changing colloids by using the electrostatic self-assembly approach. The supramolecular structures are composed of a pH-responsive polymeric surfactant and the water-soluble porphyrin 5,10,15,20-tetrakis-(sulfonatophenyl)porphyrin (TPPS). The pH-responsive surfactant polymer was achieved by the chemical modification of an alternating aliphatic polyketone (PK) via the Paal–Knorr reaction with N-(2-hydroxyethyl)ethylenediamine (HEDA). The resulting polymer/dye supramolecular systems form colloids at the submicron level displaying negative zeta potential at neutral and basic pH, and, at acidic pH, flocculation is observed. Remarkably, the colloids showed a gradual color change from green to pinky-red due to the protonation/deprotonation process of TPPS from pH 2 to pH 12, revealing different aggregation behavior.

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