Preparation of Supramolecular Polymers from a Cyclodextrin Dimer and Ditopic Guest Molecules: Control of Structure by Linker Flexibility

2005 ◽  
Vol 38 (14) ◽  
pp. 5897-5904 ◽  
Author(s):  
Kahori Ohga ◽  
Yoshinori Takashima ◽  
Hirokazu Takahashi ◽  
Yoshinori Kawaguchi ◽  
Hiroyasu Yamaguchi ◽  
...  
Keyword(s):  
Supramolecular Polymers ◽  
Guest Molecules ◽  
Cyclodextrin Dimer ◽  
Linker Flexibility

Supramolecular Polymers from a Cyclodextrin Dimer and Ditopic Guest Molecules

2005 ◽  
Vol 34 (3) ◽  
pp. 320-321 ◽  
Author(s):  
Kahori Ohga ◽  
Yoshinori Takashima ◽  
Hirokazu Takahashi ◽  
Masahiko Miyauchi ◽  
Yoshinori Kawaguchi ◽  
...  
Keyword(s):  
Supramolecular Polymers ◽  
Guest Molecules ◽  
Cyclodextrin Dimer

Supramolecular calix[4]pyrrole polymers from a complementary pair of homoditopic host–guest molecules

2019 ◽  
Vol 55 (60) ◽  
pp. 8800-8803 ◽  
Author(s):  
Samet Yuvayapan ◽  
Abdullah Aydogan
Keyword(s):  
Supramolecular Polymers ◽  
Complementary Pair ◽  
Guest Molecules

Calix[4]pyrrole based thermoresponsive supramolecular polymers were demonstrated by using a complementary pair of homoditopic host and guest molecules.

scholarly journals Synthesis and characterization of a new photoinduced switchable β-cyclodextrin dimer

2014 ◽  
Vol 10 ◽  
pp. 2874-2885 ◽  
Author(s):  
Florian Hamon ◽  
Claire Blaszkiewicz ◽  
Marie Buchotte ◽  
Estelle Banaszak-Léonard ◽  
Hervé Bricout ◽  
...  
Keyword(s):  
Molecular Modeling ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Synthesis And Characterization ◽  
Supramolecular Polymers ◽  
High Solubility ◽  
Solubility In Water ◽  
Cyclodextrin Dimer ◽  
Binding Behavior

This paper reports an efficient preparation of bridged bis-β-CD AZO-CDim 1 bearing azobenzene as a linker and exhibiting high solubility in water. The photoisomerization properties were studied by UV–vis and HPLC and supported by ab initio calculations. The cis/trans ratio of AZO-CDim 1 is 7:93 without irradiation and 37:63 after 120 min of irradiation at 365 nm; the reaction is reversible after irradiation at 254 nm. The photoinduced, switchable binding behavior of AZO-CDim 1 was evaluated by ITC, NMR and molecular modeling in the presence of a ditopic adamantyl guest. The results indicate that AZO-CDim 1 can form two different inclusion complexes with an adamantyl dimer depending on its photoinduced isomers. Both cavities of cis-AZO-CDim 1 are complexed simultaneously by two adamantyl units of the guest forming a 1:1 complex while trans-AZO-CDim 1 seems to lead to the formation of supramolecular polymers with an n:n stoichiometry.

scholarly journals Hierarchical living assembly: fabrication and visualization of multiblock microstructures

2021 ◽  
Author(s):  
Xiujuan Shi ◽  
Jun Zhang ◽  
Junkai Liu ◽  
Xueqian Zhao ◽  
Haoran Wang ◽  
...  
Keyword(s):  
Fluorescence Emission ◽  
Supramolecular Polymers ◽  
Diffraction Measurement ◽  
Complex Structures ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
Crystallization Method ◽  
Different Types ◽  
The Difference ◽  
Huge Challenge

Nature possesses a powerful ability to assemble multiple complex structures to fabricate hierarchical biological structures in a living-assembled way. However, it is still a huge challenge for artificial systems to fabricate and characterize hierarchical living assemblies with well-defined and controllable but complex structures. In this work, we proposed a new concept for the fabrication of multiblock fluorescent microcolumns, which relies on the cooperation between the controllable host–guest complexation based on cucurbit[8]uril (CB[8]) and the living assembly of nanotubular supramolecular polymers composed of CB[8] and NaBr in aqueous solution. By using the complexation of CB[8] with different guest numbers of luminogens with aggregation-induced emission (AIEgens) characteristics, and the difference in affinity between CB[8] and different types of AIEgens, the concentration-controlled and self-sorting-controlled sequential living assembly are realized, respectively. Correspondingly, multiblock fluorescent microcolumns with different fluorescence emission are fabricated, and the molecular structure of each fluorescent block is analyzed by single crystal X-ray diffraction measurement. In addition, the living assembly of multiblock fluorescent microcolumns is visualized, understood, and regulated with the aid of AIEgens. The method developed here is expected to be extended to more guest molecules of CB[8] and also provides a referential crystallization method for CB[8]-based complexes.

Tuning the configuration of the flexible metal–alkene-framework affords pure cycloisomers in solid state photodimerization

2021 ◽  
Author(s):  
Yong Wang ◽  
Meng-Fan Wang ◽  
David James Young ◽  
Hua Zhu ◽  
Fei-Long Hu ◽  
...  
Keyword(s):  
Solid State ◽  
Cycloaddition Reaction ◽  
Guest Molecules ◽  
Flexible Metal

The bulkiness of the guest molecules influences the conformations of the ligand and the final outcomes of the cycloaddition reaction.

Synthesis and Structure of a Clathrated Two-Dimensional Metal-Organic Framework: [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2·H2O (L = Bis(1-pyrazinylethylidene)hydrazine)

2008 ◽  
Vol 73 (1) ◽  
pp. 24-31
Author(s):  
Dayu Wu ◽  
Genhua Wu ◽  
Wei Huang ◽  
Zhuqing Wang
Keyword(s):  
Metal Organic Framework ◽  
Channel Structure ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
X Ray ◽  
Square Planar ◽  
Metal Organic ◽  
Aqueous Meoh ◽  
Organic Framework

The compound [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2 was obtained by the reaction of Cd(ClO4)2, bis(1-pyrazinylethylidene)hydrazine (L) and 4,4'-bipyridine in aqueous MeOH. Single-crystal X-ray diffraction has revealed its two-dimensional metal-organic framework. The 2-D layers superpose on each other, giving a channel structure. The square planar grids consist of two pairs of shared edges with Cd(II) ion and a 4,4'-bipyridine molecule each vertex and side, respectively. The square cavity has a dimension of 11.817 × 11.781 Å. Two guest molecules of bis(1-pyrazinylethylidene)hydrazine are clathrated in every hydrophobic host cavity, being further stabilized by π-π stacking and hydrogen bonding. The results suggest that the hydrazine molecules present in the network serve as structure-directing templates in the formation of crystal structures.

Effect of Benzene Derivatives as Guest Molecules on Semiconductor Properties of MOF‐199

2021 ◽  
Vol 6 (3) ◽  
pp. 425-429
Author(s):  
Haleemathul Zahadiya ◽  
Ruwan P. Wijesundera ◽  
Champika V. Hettiarachchi ◽  
Ishanie R. Perera
Keyword(s):  
Benzene Derivatives ◽  
Guest Molecules ◽  
Semiconductor Properties

scholarly journals Biotin-Containing Third Generation Glucoheptoamidated Polyamidoamine Dendrimer for 5-Aminolevulinic Acid Delivery System

2021 ◽  
Vol 22 (4) ◽  
pp. 1982 ◽  
Author(s):  
Aleksandra Kaczorowska ◽  
Małgorzata Malinga-Drozd ◽  
Wojciech Kałas ◽  
Marta Kopaczyńska ◽  
Stanisław Wołowiec ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Aminolevulinic Acid ◽  
Reactive Oxygen ◽  
Pamam Dendrimer ◽  
Variable Number ◽  
Amide Bond ◽  
Oxygen Species ◽  
Nmr Spectrum ◽  
Guest Molecules ◽  
Amine Groups

Polyamidoamine PAMAM dendrimer generation 3 (G3) was modified by attachment of biotin via amide bond and glucoheptoamidated by addition of α-D-glucoheptono-1,4-lacton to obtain a series of conjugates with a variable number of biotin residues. The composition of conjugates was determined by detailed 1-D and 2-D NMR spectroscopy to reveal the number of biotin residues, which were 1, 2, 4, 6, or 8, while the number of glucoheptoamide residues substituted most of the remaining primary amine groups of PAMAM G3. The conjugates were then used as host molecules to encapsulate the 5-aminolevulinic acid. The solubility of 5-aminolevulinic acid increased twice in the presence of the 5-mM guest in water. The interaction between host and guest was accompanied by deprotonation of the carboxylic group of 5-aminolevulinic acid and proton transfer into internal ternary nitrogen atoms of the guest as evidenced by a characteristic chemical shift of resonances in the 1H NMR spectrum of associates. The guest molecules were most likely encapsulated inside inner shell voids of the host. The number of guest molecules depended on the number of biotin residues of the host, which was 15 for non-biotin-containing glucoheptoamidated G3 down to 6 for glucoheptoamidated G3 with 8 biotin residues on the host surface. The encapsulates were not cytotoxic against Caco-2 cells up to 200-µM concentration in the dark. All encapsulates were able to deliver 5-aminolevulinic acid to cells but aqueous encapsulates were more active in this regard. Simultaneously, the reactive oxygen species were detected by staining with H2DCFDA in Caco-2 cells incubated with encapsulates. The amount of PpIX was sufficient for induction of reactive oxygen species upon 30-s illumination with a 655-nm laser beam.

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