Thematische Bibliographien / Host and Guest Molecules

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Auswahl der wissenschaftlichen Literatur zum Thema „Host and Guest Molecules“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Host and Guest Molecules"

Malinska, Maura. „Insights into molecular recognition from the crystal structures of p-tert-butylcalix[6]arene complexed with different solvents“. IUCrJ 9, Nr. 1 (16.11.2021): 55–64. http://dx.doi.org/10.1107/s2052252521010678.

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Calixarenes are host molecules that can form complexes with one or more guest molecules, and molecular recognition in calixarenes can be affected by many factors. With a view to establishing molecular recognition rules, the host p-tert-butylcalix[6]arene (TBC6) was crystallized with different guest molecules (cyclohexane, anisole, heptane, toluene, benzene, methyl acetate, ethyl acetate, dichloromethane, tetrahydrofuran and pyridine) and the obtained structures were characterized by X-ray diffraction. With most solvents, 1:1 and/or 1:3 host–guest complexes were formed, although other stoichiometries were also observed with small guest molecules, and crystallization from ethyl acetate produced the unsolvated form. The calculated fill percentage of the TBC6 cavity was ∼55% for apolar guests and significantly lower for polar solvents, indicating that polar molecules can bind to apolar cavities with significantly lower packing coefficients. The most stable crystals were formed by 1:1 host–guest inclusion complexes. The ratio between the apolar surface area and the volume was used to predict the formation of inclusion versus exclusion complexes, with inclusion complexes observed at ratios <40. These findings allow the binding of potential guest molecules to be predicted and a suitable crystal packing for the designed properties to be obtained.

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Meier, Herbert, Elena Karpouk, Matthias Lehmann, Dieter Schollmeyer und Volker Enkelmann. „Guest-Host Systems of 1,3,5-Tristyrylbenzenes“. Zeitschrift für Naturforschung B 58, Nr. 8 (01.08.2003): 775–81. http://dx.doi.org/10.1515/znb-2003-0809.

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(E,E,E)-1,3,5-Tris(3,4,5-trimethoxystyryl)benzene (1a) forms monoclinic crystals of the space group P21/c. Incorporation of three transoid diacetyl guest molecules between the three arms leads to triclinic crystals of the space group P1. The styryl groups, originally present in a nonsymmetrical conformation, are simultaneously transformed to a C3 arrangement. (E,E,E)-1,3,5-Tris- (3,4,5-tripropoxystyryl)benzene (1b) forms monoclinic crystals of the space group P21/c. The C3 arrangement of the styryl groups is present in the first, the unsymmetrical arrangement in the second modification. Incorporation of two acetone guests in the largest and the middle-sized angle space between the styryl arms in the unsymmetrical arrangement, leads to monoclinic crystals of the space group P21/n. The third (smallest) angle space is filled with a propoxy chain of the neighboring molecule. The pure host crystals show significant deviations from planarity which are strongly reduced by the incorporation of the guest molecules.

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Ahn, Yun-Ho, Byeonggwan Lee und Kyuchul Shin. „Structural Identification of Binary Tetrahydrofuran + O2 and 3-Hydroxytetrahydrofuran + O2 Clathrate Hydrates by Rietveld Analysis with Direct Space Method“. Crystals 8, Nr. 8 (18.08.2018): 328. http://dx.doi.org/10.3390/cryst8080328.

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The structural determination of clathrate hydrates, nonstoichiometric crystalline host-guest materials, is challenging because of the dynamical disorder and partial cage occupancies of the guest molecules. The application of direct space methods with Rietveld analysis can determine the powder X-ray diffraction (PXRD) patterns of clathrates. Here, we conducted Rietveld analysis with the direct space method for the structural determination of binary tetrahydrofuran (THF) + O2 and 3-hydroxytetrahydrofuran (3-OH THF) + O2 clathrate hydrates in order to identify the hydroxyl substituent effect on interactions between the host framework and the cyclic ether guest molecules. The refined PXRD results reveal that the hydroxyl groups are hydrogen-bonded to host hexagonal rings of water molecules in the 51264 cage, while any evidences of hydrogen bonding between THF guests and the host framework were not observed from PXRD at 100 K. This guest-host hydrogen bonding is thought to induce slightly larger 512 cages in the 3-OH THF hydrate than those in the THF hydrate. Consequently, the disorder dynamics of the secondary guest molecules also can be affected by the hydrogen bonding of larger guest molecules. The structural information of binary clathrate hydrates reported here can improve the understanding of the host-guest interactions occurring in clathrate hydrates and the specialized methodologies for crystal structure determination of clathrate hydrates.

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Lee, Rachael, Michael Probert und Jonathon Steed. „The changeable nature of urea inclusion compounds.“ Acta Crystallographica Section A Foundations and Advances 70, a1 (05.08.2014): C1706. http://dx.doi.org/10.1107/s205327331408293x.

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Urea inclusion compounds (UICs), the β-phase of urea, have been known only since 1949 and have revealed various structural and behavioural characteristics of interest, largely influenced by the type of guest molecule present in the crystal. These structures have a hexagonally symmetrical honeycomb structure of a hydrogen-bonded urea network encapsulating the guest molecules, a defining motif of these clathrates. The simplest of this class contains an alkane guest (C7-C20), creating an incommensurate relationship between host and guest and a significantly disordered crystal structure with respect to the guest. As a result, diffuse scattering is typical in the diffraction patterns of UICs. As the guest molecules are altered, so too is the behaviour of the host network. With certain dihaloalkanes for example, the guest may coil into an atypical conformation in order to present a commensurate relationship with the host. This increase in guest order creates a distortion of the host network away from hexagonal symmetry, creating an internal stress which causes domain switching within the system. A number of different effects such as this can be seen on changing the guest molecule, ferroelasticity being an example for certain diketone guests. In this work we are exploring examples of UICs which, due to unusual interaction between the host and guest, display atypical structural features, symmetry or behaviour. These crystal structures are under investigation at a range of temperatures and pressures, by both X-ray and neutron diffraction techniques in order to fully understand the nature and bonding of UICs.

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Facey, Glenn A., und Ilia Korobkov. „Investigation of the disorder of dibromo- and dichloromethane in their tri-ortho-thymotide clathrates using X-ray diffraction and solid-state 2H NMR spectroscopy“. Canadian Journal of Chemistry 89, Nr. 7 (Juli 2011): 854–62. http://dx.doi.org/10.1139/v10-178.

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The tri-ortho-thymotide (TOT) clathrates of dibromo- and dichloromethane were characterized by single crystal X-ray diffraction at 200 K and solid-state 2H NMR spectroscopy as a function of temperature. The host structure was found to be typical of other cage-type TOT clathrates. The X-ray results showed a substantial amount of disorder among the guest molecules. In both clathrates, multiple guest molecule positions could be modeled. The heavy atoms of all the guest molecule positions lie approximately in the same plane, with some out-of-plane distortion. The guest molecules were of two different types in positions symmetric about the crystallographic twofold rotation axis: type A guests, with carbon atoms well removed from the crystallographic twofold axis, and type B guests, with carbon atoms very close to the twofold axis. The 2H NMR spectra for the guests confirmed that the disorder was dynamic. The experimental results could be accounted for by the presence of three simultaneous types of molecular motion, all fast with respect to the 2H quadrupolar interaction: (i) twofold molecular flips about the molecular C2 symmetry axis, (ii) exchange between the type A and type B sites in a single plane, and (iii) a two-site libration of the plane containing the heavy atoms of the A and B guest sites with a temperature-dependent amplitude.

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Mustafa, Siti Fatimah Zaharah, Hasmerya Maarof, Mohammed Abu Naser, Hassan H. Abdallah, Ahmad Irfan und Rashid Ahmed. „Behavioral pattern exploration of single guest, hexadecane-1,16-diol and hexadecane in urea inclusion compounds via molecular dynamics simulation“. Journal of Theoretical and Computational Chemistry 15, Nr. 06 (September 2016): 1650047. http://dx.doi.org/10.1142/s0219633616500474.

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The urea inclusion compounds, a unique polar organic crystalline complex, are considered as a potential candidate for a molecular separator of long chain alkane molecule. A well-defined structure of the crystalline channel systems constructed from hydrogen bonding arrangement of the urea molecules, can be used to understand the fundamental aspects of the processes involving ions or molecules transportation. To do so, in our work, molecular dynamics approach is implemented to understand the behavioral pattern of the hexadecane-1,16-diol and hexadecane guests’ related to translational and rotational orientation along the urea tunnel. Our obtained results reveal that high interaction of hexadecane-1,16-diol with urea host molecules offers a restricted environment inside urea tunnel, resulting in slowing down the guest movement. Hexadecane guest system, on the contrary, exhibits lower interaction whereby the translational and rotational movement is faster. Moreover, as the distance increases (along [Formula: see text]-axis) in the urea tunnel, both guest systems favor a clockwise rotational orientation. Preference of the respected orientation indicates the influence of chiral urea tunnel on achiral guests that is clathrate inside the tunnel structure.

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Labuta, Jan, Shinsuke Ishihara, Daniel T. Payne, Kazuyoshi Takimoto, Hisako Sato, Lenka Hanyková, Katsuhiko Ariga und Jonathan P. Hill. „Estimation of Enantiomeric Excess Based on Rapid Host–Guest Exchange“. Chemosensors 9, Nr. 9 (09.09.2021): 259. http://dx.doi.org/10.3390/chemosensors9090259.

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Chiral molecules possess enantiomers that have non-superimposable chemical structures but exhibit identical nuclear magnetic resonance (NMR) spectra. This feature prevents the use of NMR spectroscopic methods for the determination of enantiomeric excesses (ee) of chiral molecules, using simple mixtures of their enantiomers. Recently, however, it was reported that the addition of a symmetrical prochiral molecule (a reporter or host) into a solution of chiral analyte can lead to estimation of ee through interactions involving rapid exchange of the chiral analyte (guest) in the formed host–guest complex. This is due to the ee-dependent splitting of NMR resonances of the prochiral host molecule based on averaging the chemical shift non-equivalency caused by the presence of a chiral guest. The mechanism is not dependent on diastereomer formation, and 1:1 host–guest complexes can also show ee-dependent NMR peak splitting. Prochiral molecules capable of ee sensing using the NMR technique are now referred to as so-called prochiral solvating agents (pro-CSAs). pro-CSAs represent a family of reagents distinct from the commonly used NMR chiral derivatizing reagents (where chiral auxiliaries are used to derivatize enantiomers to diastereomers) or chiral solvating agents (where chiral auxiliaries interact in an asymmetric manner with analyte enantiomers). pro-CSA methods are unique since neither pro-CSA nor NMR contains chiral factors, making the technique neutral with respect to chirality. Here, we review our recent work on this matter involving several different nominally achiral receptor molecules whose unique guest binding properties and solution characteristics (especially with regard to NMR spectroscopy) allow for the estimation of ee in the corresponding chiral guests.

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Fu, T. Y., J. R. Scheffer und J. Trotter. „Structures and Photochemistry of Inclusion Compounds of 9,10-Dihydro-9,10-ethenoanthracene-11,12-bis(diphenylmethanol)“. Acta Crystallographica Section B Structural Science 53, Nr. 2 (01.04.1997): 300–305. http://dx.doi.org/10.1107/s0108768196013614.

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Crystal structures have been determined for inclusion complexes of the host molecule 9,10-dihydro-9,10-ethenoanthracene-11,12-bis(diphenylmethanol), with acetone, ethanol and toluene as guest solvent molecules. The host molecule exhibits an intramolecular O--H...O hydrogen bond in each of the complexes, with intermolecular hydrogen bonds to the acetone and ethanol guests. Different photoproducts are obtained from solution and solid-state photolyses; the solid-state reaction involves a relatively small amount of molecular rearrangement, for which a mechanism is proposed.

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Ramaekers, Mellany, Sjors P. W. Wijnands, Joost L. J. van Dongen, Luc Brunsveld und Patricia Y. W. Dankers. „Cucurbit[8]uril templated supramolecular ring structure formation and protein assembly modulation“. Chemical Communications 51, Nr. 15 (2015): 3147–50. http://dx.doi.org/10.1039/c4cc08917k.

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Wang, Xuebin, Jiecheng Ji, Zejiang Liu, Yimin Cai, Jialiang Tang, Yunzhi Shi, Cheng Yang und Lihua Yuan. „Chiroptical Sensing of Amino Acid Derivatives by Host–Guest Complexation with Cyclo[6]aramide“. Molecules 26, Nr. 13 (02.07.2021): 4064. http://dx.doi.org/10.3390/molecules26134064.

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A hydrogen-bonded (H-bonded) amide macrocycle was found to serve as an effective component in the host–guest assembly for a supramolecular chirality transfer process. Circular dichroism (CD) spectroscopy studies showed that the near-planar macrocycle could produce a CD response when combined with three of the twelve L-α-amino acid esters (all cryptochiral molecules) tested as possible guests. The host–guest complexation between the macrocycle and cationic guests was explored using NMR, revealing the presence of a strong affinity involving the multi-point recognition of guests. This was further corroborated by density functional theory (DFT) calculations. The present work proposes a new strategy for amplifying the CD signals of cryptochiral molecules by means of H-bonded macrocycle-based host–guest association, and is expected to be useful in designing supramolecular chiroptical sensing materials.

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Dissertationen zum Thema "Host and Guest Molecules"

Bezuidenhout, Charl Xavier. „Polar ordering of guest molecules in host-guest inclusion complexes“. Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18107.

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Thesis (MSc)--Stellenbosch University, 2011.
ENGLISH ABSTRACT: 2,7-dimethylocta-3,5-diyne-2,7-diol forms inclusion complexes with various guests molecules, where the guest molecules are polar-ordered. A Cambridge Structural Database (CSD) search revealed ten inclusion complexes where the guest molecules were polar-ordered. Using Density Functional Theory (DFT) computational methods (in the absence of the host), we evaluated the intra-channel and lateral guest-guest interactions between the guest molecules. Two polar-ordered inclusion complexes ((1,4,7-cyclohexane-1,2,4,5,7,8-hexaoxonane)·CHCl3 and (2,4,6-(endolongifolyl)-1,3,5-trioxane)·CDCl3) were singled out in the CSD search for further studies along with 2,7-dimethylocta-3,5-diyne-2,7-diol. Synthesis of any 1,2,4,5,7,8-hexaoxonane and 1,3,5-trioxane derivatives was attempted to establish whether the polar-ordering ability extends into the family of compounds. We managed to produce three new polar-ordered inclusion complexes with 2,7-dimethylocta-3,5-diyne-2,7-diol (ClC(CH3)3, BrC(CH3)3 and IC(CH3)3), thus extending the series to six guest polar-ordered systems. We were only able to synthesise 1,4,7-cyclohexane-1,2,4,5,7,8-hexaoxonane and produce the CHCl3 inclusion complex and one new polar-ordered inclusion complex (CHBr3). Three 1,3,5-trioxanes was synthesised (the cyclohexyl, cyclohex-3-en-1-yl and cyclopentyl derivatives), which did not include any solvents. However, these 1,3,5-trioxanes also form polar-ordered crystals. These compounds and inclusion complexes were analysed by means of single crystal X-ray diffraction to determine their crystal structures. All the crystal structures could be solved and refined to adequate accuracy (except for 2,4,6-tri(cyclopentyl)-1,3,5-trioxane) with no disorder of the guest molecules (where applicable) and their polar-ordering property investigated. Due to their vast molecular differences, these compounds were studied separately by means of visual crystal structure analysis and computational modelling techniques (Density functional theory, molecular mechanics, molecular dynamics and molecular quench dynamics).
AFRIKAANSE OPSOMMING: 2,7-dimetielokta-3,5-diyn-2,7-diol vorm insluitingskomplekse met verskeie molekules as gaste, waar die gas-molekules polêr georden is. 'n Cambridge Struktuur Databasis (CSD) soektog lewer tien insluitings komplekse waarvan die gas-molekules polêr georden is. Deur gebruik te maak van Digtheidsfunksionele teorie (DFT) berekeninge (in die afwesigheid van die gasheer) het ons die inter-kanaal en wedersydse gas-gas interaksies tussen die gas molekules geëvalueer. Twee polêr geordende insluitingskomplekse ((1,4,7-sikloheksaan-1,2,4,5,7,8-heksaoksonaan)·CHCl3 en (2,4,6-(endolongifolyl)-1,3,5-trioksaan)·CDCl3) is uitgesonder uit die CSD soektog vir verdere studies saam met 2,7-dimetielokta-3,5-diyn-2,7-diol. Aanslag was gemaak om enige 1,2,4,5,7,8-heksaoksonaan en 1,3,5-trioksaan derivate te sintetiseer en vas te stel of die polêre ordensvermoë oor die familie van verbindings strek. Ons het daarin geslaag om drie nuwe polêr geordende insluitingskomplekse op te lewer met 2,7-dimetielokta-3,5-diyn-2,7-diol (Cl(CH3)3, BrC(CH3)3 en I(CH3)3), en sodoende die reeks uitgebrei na ses gaste wat polêr geordende insluitingskomplekse vorm. Net 1,4,7-sikloheksaan-1,2,4,5,7,8-heksaoksonaan kon gesintetiseer word en dit lewer twee polêr geordende insluitingskomplekse (CHCl3 en CHBr3 (nuut)). Drie 1,3,5-trioksane is gesintetiseer (die sikloheksiel, sikloheks-3-een-1-iel en siklopentiel derivate) en het nie enige oplosmiddels (gaste) ingesluit nie. Nietemin vorm hiedie 1,3,5-trioksane ook polêr geordende kristalle. Hierdie verbindings en insluitingskomplekse is geanaliseer deur middel van enkelkristal X-straal diffraksie om hul kristalstrukture te bepaal. Alle kristalstrukture was opgelos en verwerk tot voldoende akkuraatheid (behalwe vir 2,4,6-tri(siklopentiel)-1,3,5-trioxane) met geen wanorde in die gas molekuul posisies nie (waar van toepassing) en hul polêre ordensvermoë is ondersoek. As gevolg van groot verskille in hul molekulêre strukture, is hierdie verbindings afsonderlik bestudeer deur middel van molekulêre modellerings metodes (Digtheidsfunksionele teorie, molekulêre meganika, molekulêre dinamika en molekulêre stakings dinamika).

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Kundu, Mitali. „Exploration of inclusion complexes between host and guest molecules and solvation effect of some vital molecules in various environments“. Thesis, University of North Bengal, 2017. http://ir.nbu.ac.in/handle/123456789/2689.

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Bouanga, Boudiombo Jacky Sorrel. „Molecular selectivity by host-guest methods“. Doctoral thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/33667.

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The Host-Guest inclusion crystallization method has long been used for the separation of closely related compounds. Especially for the separation of isomers which presented difficulties in techniques like distillation or chromatography. In this study, different host systems were used to separate isomers of trimethoxybenzenes, lutidines, methylacetophenones and xylenols. Isomers are compounds with the same molecular formula but different arrangement of their atoms. They are often produced as mixtures when synthesised in large quantities by various industries and are more valuable as purified single components. Thus, it is important to separate them into their individual components. The process of Host-Guest method is dependent on the phenomenon of molecular recognition between the host and guest molecules, and this, in turn, relies on the sum of non-bonded, secondary interactions which impinge on the final crystalline product. This is especially the case for enantiomers which are isomers with the same boiling points and melting point. However, enantiomers differ by their ability to diffract polarised light. Although countless methods have been used for their separation, one method that has been proven to be certainly successful on this path was the “family method”. The “Dutch resolution method” or the “family method” makes use of the crystallization technique by mixing similar host compounds to separate enantiomers. However, the improvement of the end results was not understood. In fact, the whole process has been done just on results and no analysis of the actual activity occurring at the molecular level was investigated. In this research, the Host-Guest chemistry method was applied with the aim of separating several isomers compounds in the intention of understanding the selectivity characteristics of a particular host. For the purpose of the analysis, structural isomers with close boiling points were selected. Competition experiments were set to survey which of the isomers were a better fit for a particular host. After analysis of the different crystal material obtained from crystallization experiments with NMR techniques, various trends were observed. X-Ray crystallography was employed to elucidate the crystal structures of the different compound formed by Host-Guest chemistry. The new complexes were further analysed by thermal analysis (TGA, DSC), kinetics of desolvation, Hirshfeld surface analysis, and activation energy of desolvation-analysis techniques. During the separation of the trimethoxybenzene (TMB) isomers, cholic acid and deoxycholic acid' hosts were used in chapter 3. It was found that each host separated the isomers differently. That was independent of the closeness of their molecular structures. The difference in selectivity was attributed to the arrangement of each host in the structure obtained with the guest compounds. Separation of lutidines was carried out in chapters 4 and 5. The first separation consisted of the study of the fifteen pairwise combinations of the isomers with 3,3′-bis(9-hydroxy-9- fluorenyl)2−2′- binaphthyl which is presented in chapter 4. The second analysis was carried out with host 2,2'bis(1-hydroxy-4,5-dihydro-2,3:6,7-dibenzocycloheptatrien-1-yl)-biphenyl. Nevertheless, both hosts preferred 3,4-lutidine. Four additional hosts were used to simulate the “Dutch resolution method” in chapter 5. Further analysis of torsion angles was performed over the five hosts for the complexes formed with 2,4-lutidine and 3,5-lutidine. The host characterized by unbridged phenyl moieties and the one characterized by bulky tert-butyl groups was found to prefer 3,5-lutidine. In chapter 6, deoxycholic acid resolved the 2-methylcyclohexanone (2MCH) but not 3- methylcyclohexanone (3MCH) during the separation of methylcyclohexanone isomers. However, during the competition experiment, it was found that when 2MCH was mixed with 3MCH, the latter was resolved as an S-enantiomer. Kinetics of desolvation studied resulted in the determination of the activation energies of the Host-Guest complexes and was like the trend observed by 1H NMR analysis. Chapter 7 was focused on the synergistic effect of mixed hosts system. This was to emphasize the impact that a mixture of compounds with similar structural composition may provide. Competition experiments were done with the 15 pairs of xylenol isomers with 4,4'- isopropylidene Bisphenol. Three of these pairs were selected for further analysis with two similar bisphenol hosts. One interesting structure was obtained with 4,4-isopropylidene Bisphenol and 4,4'-(9-Fluorenylidene) Bisphenol with a guest mixture. This is an unusual result as crystal structures comprising two hosts with two guests are rare.

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Yasmin, Ananya. „Investigation of Host Guest Inclusion Complexations and Diverse Interactions of Some Industrially and Biologically Potent Molecules in Assorted Phases by Physicochemical Methodologies“. Thesis, University of North Bengal, 2019. http://ir.nbu.ac.in/handle/123456789/2854.

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Lacy, Stephen Michael. „Redox-active cyclophane host molecules for the inclusion of cationic and neutral guest species“. Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333410.

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HOUSE, BRIAN EDWARD. „HOST-[2] ROTAXANES: GUEST RECOGNITION AND CELLULAR TRANSPORT“. University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155826127.

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Roy, Aditi. „Study to explore molecular inclusion complexes of cyclic hosts with vital guests in various environments“. Thesis, University of North Bengal, 2018. http://ir.nbu.ac.in/handle/123456789/2633.

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Grotzfeld, Robert M. (Robert Martin). „Studies in molecular recognition : self-assembling molecular host-guest sytems“. Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10865.

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Saha, Binoy Chandra. „Host guest inclusion complexes and thermodynamic properties of some imperative molecules with the manifestation of diverse interections by physiochemical investigation“. Thesis, University of North Bengal, 2020. http://ir.nbu.ac.in/handle/123456789/3966.

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Barman, Siti. „Investigation on solvation behaviour and host guest inclusion complexes of some significant molecules with diverse cyclic compounds“. Thesis, University of North Bengal, 2017. http://ir.nbu.ac.in/handle/123456789/2588.

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Bücher zum Thema "Host and Guest Molecules"

Franco, Laeri, Hrsg. Host-guest-systems based on nanoporous crystals. Weinheim: Wiley-VCH, 2003.

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Symposium on Host-Guest Molecular Interactions: from Chemistry to Biology (1990 : Ciba Foundation), Hrsg. Host-guest molecular interactions: From chemistry to biology. Chichester: Wiley, 1991.

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Crowe, Declan Brendan. Macrocyclic host molecules designed to selectively bind and transport ammonium and primary ammonium guest cations. Birmingham: University of Birmingham, 1991.

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Tite, Elizabeth Louise. The study of preorganised redox-active host molecules designed to bind neutral and cationic guest species. Birmingham: University of Birmingham, 1989.

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Chadwick, Derek J., und Kate Widdows, Hrsg. Ciba Foundation Symposium 158 - Host-Guest Molecular Interactions: From Chemistry to Biology. Chichester, UK: John Wiley & Sons, Ltd., 1991. http://dx.doi.org/10.1002/9780470514085.

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Penadés, Soledad, Hrsg. Host-Guest Chemistry. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45010-6.

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Sarmento, Julĩo. Guest or host? Las Palmas de Gran Canaria: Centro Atlántico de Arte Moderno, CAAM, 2014.

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Vögtle, Fritz, und Edwin Weber, Hrsg. Host Guest Complex Chemistry / Macrocycles. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70108-5.

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Madoff, Steven Henry. Meʼareaḥ ṿe-oreaḥ Host & guest. Tel Aviv: Muzeʼon Tel Aviv le-omanut, 2013.

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Brady, Mary Bernadette. Host-guest chemistry of Thioglycosidic Cyclodextrins. Dublin: University College Dublin, 1995.

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Buchteile zum Thema "Host and Guest Molecules"

Cram, D. J. „Designed Host-Guest Relationships“. In Design and Synthesis of Organic Molecules Based on Molecular Recognition, 153–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70926-5_13.

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Blaschke, G. „Stereoselective Guest-Host Relationships“. In Design and Synthesis of Organic Molecules Based on Molecular Recognition, 227–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70926-5_18.

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Vögtle, Fritz, Heinz Sieger und Walter Manfred Müller. „Complexation of Uncharged Molecules and Anions by Crown-Type Host Molecules“. In Host Guest Complex Chemistry / Macrocycles, 319–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70108-5_8.

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Shinkai, Seiji. „Molecular Recognition of Calixarene-Based Host Molecules“. In United States-Japan Seminar on Host-Guest Chemistry, 193–201. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0969-4_22.

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Baars, Maurice W. P. L., und E. W. Meijer. „Host-Guest Chemistry of Dendritic Molecules“. In Dendrimers II, 131–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-46577-4_3.

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Clever, Guido H. „Switchable Host-Guest Interactions of Supramolecular Rings and Cages“. In Molecules at Work, 13–37. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527645787.ch2.

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Luisi, Pier Luigi, und Linda Magid. „Biopolymers in Reverse Micelles as Guest — Host Molecular Systems“. In Design and Synthesis of Organic Molecules Based on Molecular Recognition, 198–222. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70926-5_16.

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Bishop, Roger. „Supramolecular Host–Guest Chemistry of Heterocyclic V-Shaped Molecules“. In Topics in Heterocyclic Chemistry, 75–102. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/7081_2008_9.

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Dearden, David V. „Host-Guest Molecular Recognition Without Solvents“. In Physical Supramolecular Chemistry, 229–47. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0317-3_15.

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Whitlock, Barbara J., und Howard W. Whitlock. „Design of Host Molecules Capable of Forming Extremely Stable Host-Guest Complexes“. In Supramolecular Stereochemistry, 117–25. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0353-4_14.

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Konferenzberichte zum Thema "Host and Guest Molecules"

Singer, Kenneth D. „Optical Nonlinearities of Guest-Host-Polymer Structures“. In Nonlinear Optical Properties of Materials. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/nlopm.1988.mb4.

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Until recently, attempts to take advantage of the large second-order optical nonlinearities of certain conjugated organic molecules in devices were limited to neat crystalline materials, since the requirements for a noncentrosymmetric bulk phase could be met with molecular and polymeric crystals that happen to condense in a noncentrosymmetric point group.[1] The large dipoles that are often observed in these molecules made the growth of optical quality and robust crystals difficult. More recently, mixed systems consisting of the nonlinear optical molecules incorporated into polymer glasses, liquid crystals, and liquid crystal polymers have been investigated.[2] The difficulties in processing that are required to obtain optical quality materials are reduced. For second-order nonlinearities, an alignment process, such as electric field poling, is required to break the center of symmetry inherent in these materials. However, the reduction in number density and alignment attainable with realistic poling fields requires molecules with exceptionally large nonlinear optical susceptibilities in order to obtain bulk materials with nonlinear coefficients large enough to produce sensible devices.

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Ikeda, Tomiki, und Osamu Tsutsumi. „Liquid Crystalline Materials for Photonics: Optical Switching by Means of Photochemical Phase Transition of Liquid-Crystalline Azobenzene Films“. In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.wd63.

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Isothermal phase transition of liquid crystals (LCs) can be induced reversibly by photochemical reaction of guest molecules incorporated into the LC phase at concentrations of 1 ~ 5 mol%. Such photoresponsive molecules as azobenzene and spiropyran derivatives have been proved to be effective guest molecules to bring about the photochemical phase transition. 1-5 The mechanism of the photochemical phase transition is interpreted in terms of the change in the molecular shape of the guest molecules by the photochemical reaction. For example, trans-azobenzenes are rod-like shape, stabilizing the LC phase, while cis-azobenzenes are bent, destabilizing the LC phase. When the trans-azobenzene/nematic (N) LC mixtures are irradiated to cause trans-cis photoisomerization of the guest molecules, the LC phase of the mixtures is destabilized in accumulation of the cis form and the N to isotropic (I) phase transition temperature (tNI) is lowered. When tNI is lowered below the irradiation temperature, N-I phase transition of the guest/host mixture is induced isothermally. This process is reversible, and cis-trans back isomerization restores the initial N phase. Time-resolved measurements by the use of a pulsed laser have revealed that the photochemical N-I phase transition takes place in the time region of 50 ~ 200 ms for the nematic hosts of low-molecular-weight (LMW) as well as polymeric LCs.6,7 Propagation of perturbation in the form of the trans-cis isomerization of the guest molecules may require a relatively long time in the LC systems.

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Yagyu, Eiji, Tetsuya Nishltnura und Motomu Yoshimura. „Quantitative and Theoretical Analysis of PHB-Hole Feature under Applying Electric Field.“ In Spectral Hole-Burning and Luminescence Line Narrowing: Science and Applications. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.pd2.

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We have investigated the stark effect on the spectral hole characteristics in the photochemical hole burning systems of anthraquinone derivatives, such as, 1,4-dihydroxyanthraquinone (HAQ) and 4-amino-2,6-bis(4-butylphenoxy)1,5-dihydroxyanthraquinone (ABDAQ) as guest molecules embedded in host polymers such as 2-hydroxyethyl methacrylate (PHEMA) or poly(vinyl butyral) (PVB)1-3). Consequently, we evaluated the dipole moment differences |δμ| of guest molecules. These dipole moment differences depended on the characteristics of the guest and host molecules. This material dependence of the dipole moment differences was able to be explained qualitatively by Hammett’s substituent constant and the Taft’s polar substituent constant3).

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Wu, J. W., J. F. Valley, M. Stiller, S. Ermer, E. S. Binkley, J. T. Kenney, G. F. Lipscomb und R. Lytel. „Poled polyimides for thermally stable electrooptic material“. In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.fq4.

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We present data indicating that polyimide is a suitable host for nonlinear optical molecules and that the resulting guest-host system, once poled, has a highly thermally stable EO response. This stability requires both poling during curing and coplanar electrodes. First, the poling electric field is applied during the cure process so that the dipole alignment is achieved before imidization and densification; second, the guest molecules are aligned in the same orientation as the conforming morphology of the host polymer. After vacuum soft-baking the spin-coated guest-dye/host-polyimide thin film (Erythrosin/L100), the films were imidized by heating to 250°C with a dc electric poling field applied. After holding the sample at 250°C for 1 h, the sample was further cured at 360°C for 0.25 h for the densification process and then cooled. The dc poling field was removed upon reaching room temperature.

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Molis, Steven E., und Robert J. Twieg. „Fourier-transform IR characterization of molecular orientation in poled polymer glasses“. In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.the2.

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The electro-optical activity of organic, nonlinear optical (NLO) systems in part depends on the extent of molecular orientation of the NLO moiety. In this investigation, the technique of using infrared absorption spectroscopy to characterize molecular orientation is introduced as a means of characterizing orientational order in poled polymer glasses. A quantitative understanding of this orientation can be used in modeling the field-induced orientation of a dipole as well as for determining the polarizabilities of new NLO substituents. In this initial investigation the orientation of organic guest molecules in corona-poled guest/host systems is investigated with FTIR spectroscopy. The guest molecules include 2-methyl-4-nitroanaline and 4-aminobenzonitrile. For compatibility, we usually used polymethylmethacrylate (PMMA) as the matrix polymer, and it is interesting that some of the PMMA substituent groups also exhibit field-induced orientation. Molecular orientation parameters and relaxation behavior of these systems will be presented.

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Güttler, Frank, Marco Pirotta, Alois Renn und Urs P. Wild. „Single molecule spectroscopy: Stark effect of pentacene in p-terphenyl“. In Spectral Hole-Burning and Luminescence Line Narrowing: Science and Applications. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.mb1.

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Based on the occurrence of extremely narrow zero phonon lines and their inhomogeneous distribution spectroscopic isolation of single absorbers in solid matrices can be achieved. Pentacene molecules in a p-terphenyl host crystal have been studied at cryogenic temperatures using absorption [1] and fluorescence excitation [2,3] techniques. Such investigations provide information on a variety of guest host properties such as homogeneous dephasing, spectral diffusion [3] and inhomogeneous broadening. Single molecule detection also is a key to the investigations of fundamental spectroscopic properties of individual molecules.

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Chen, Yanping, Ling Fu, Xintong Xu, Irene Ling Li, Shuangchen Ruan, Dunliang Jian und Jianpang Zhai. „Host-guest interaction between Acridine orange molecules and AFI or CHA zeolite crystals“. In Second International Conference on Photonics and Optical Engineering, herausgegeben von Chunmin Zhang und Anand Asundi. SPIE, 2017. http://dx.doi.org/10.1117/12.2257879.

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Suzuki, A., Y. Matsuoka, Y. Kitahara und A. J. Ikushima. „Evaluation of Nonlinear Optical Host-Guest Systems with Long Lifetime“. In Nonlinear Optics. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/nlo.1992.md25.

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Host-guest systems which consist of transparent polymer matrices and optical nonlinear active molecules, are one of the key materials for optical nonlinear devices. For practical use, the materials should have both large nonlinearity and long lifetime. Such host-guest systems, made of poly-acrylamide derivatives and p-nitroaniline, have been developed in the group of present authors1). The lifetimes at room temperature are expected to be more than several 10 years, as were estimated from the changes in nonlinear susceptibility over 180 days. Such a conventional evaluation might not be sufficiently accurate for long lifetime materials, because the lifetime is 10~1000 times longer than the ordinary available experimental period. In this paper we estimated the lifetime at room temperature from the Arrhenius plot based on the lifetime data at elevated temperature. This method seems to be more accurate and timesaving than the conventional one.

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Horie, Kazuyuki. „New Mechanisms and New Systems of Hole Formation in Spectral Hole Burning“. In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.thf1.

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A variety of studies on persistent spectral hole burning (PSHB) have been carried out for the last twenty years [1-4], since the discovery of this phenomenon in 1974. The elucidation of electron-phonon interaction, the nature of a zero-phonon line and spectral diffusion in PSHB have been studied intensively together with the research aiming at its possible applicability to ultra-high density optical storage. However, as for the PSHB materials, most of the works have been carried out with porphyrins, phthalocyanines, and quinizarin including their derivatives, several organic dyes, samarium and some other inorganic ions. The number of molecules reported to show hole formation so far is restricted compared to a wide variety of chemical structure of organic molecules. This would be because it is usually thought that for the hole formation the existence of a zero-phonon line in guest molecules for SHB should be accompanied by the occurrence of some photochemical reaction of the guest molecules. A well-known exception on this point is the so-called non-photochemical hole burning (NPHB) [4]. Recently triplet-triplet energy transfer of guest molecule to a host photo-reactive matrix has been reported to be a new family [5] of PSHB systems with new mechanism.

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Santa María, Dolores, R. Claramunt, M. García und M. Farrán. „Molecular Modeling:Prediction of the structure of Host-Guest complexes“. In The 14th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2010. http://dx.doi.org/10.3390/ecsoc-14-00407.

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Berichte der Organisationen zum Thema "Host and Guest Molecules"

Lawandy, Nabil M. (AASERT) Superconductors and Nonlinear Optical Materials Based on Molecular Guest-Host Systems. Fort Belvoir, VA: Defense Technical Information Center, September 1995. http://dx.doi.org/10.21236/ada299480.

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Fischer, J. E. Structure and dynamics in low dimensional guest-host solids. Office of Scientific and Technical Information (OSTI), November 1992. http://dx.doi.org/10.2172/6948234.

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Fischer, J. E. Structure and dynamics in low-dimensional guest-host systems. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/5329750.

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John E. Fischer. Structure and dynamics in low-dimensional guest-host systems. Office of Scientific and Technical Information (OSTI), Mai 2000. http://dx.doi.org/10.2172/764604.

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Wu, Yue. Interactions and Reactions of Guest Molecules with Nanotubular Materials. Fort Belvoir, VA: Defense Technical Information Center, Juli 2010. http://dx.doi.org/10.21236/ada532447.

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Truong, Thai Viet. Dynamical Study of Guest-Host Orientational Interaction in LiquidCrystalline Materials. Office of Scientific and Technical Information (OSTI), Januar 2005. http://dx.doi.org/10.2172/888975.

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Taheri, Bahman. Ambient Light Control Using Guest Host Liquid-Crystal Dye Systems. Fort Belvoir, VA: Defense Technical Information Center, April 2003. http://dx.doi.org/10.21236/ada418046.

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Jeng, R., Y. M. Chen, J. Kumar und S. Tripathy. Novel Crosslinked Guest-Host System with Stable Second Order Nonlinearity. Fort Belvoir, VA: Defense Technical Information Center, Mai 1992. http://dx.doi.org/10.21236/ada251816.

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Hu, M. Z. Design and Synthesis of Oriented Guest-Host Nanostructures for Enhanced Membrane Performances. Office of Scientific and Technical Information (OSTI), November 2005. http://dx.doi.org/10.2172/885953.

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Pluth, Michael D., Kenneth N. Raymond und Robert G. Bergman. Selective Organic and Organometallic Reactions in Water-Soluble Host-Guest Supramolecular Systems. Office of Scientific and Technical Information (OSTI), Februar 2008. http://dx.doi.org/10.2172/952577.

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