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Showing 1 to 20 of 106 for “"Dendrimers"”.
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Cored Dendrimers: Synthesis and Applications
Analogous to molecular imprinted polymers, cored dendrimers were imprinted by synthesizing the structure in the presence of a template (core unit). Porphyrins were found to be useful target compounds for which to imprint cored dendrimers. The porphyrins were used as spectrophotometric probes to …
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Computer simulations of Fréchet dendrimers in solutions
The structure and dynamics of dendrimers in solution are studied through nanosecond atomistic Molecular Dynamics (MD) simulations of explicitly solvated Fréchet dendrimers, generations G1 to G5. The properties of these dendrimers are investigated in four solvent invironments: vacuum and water …
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Supramolecular Assemblies: Dendrimers, Linear Arrays, and Polypseudorotaxanes
… moiety. The wholly complexed self-assembling dendrimers were evidenced by 1H NMR spectroscopy and mass spectrometry. Linear supramolecular pseudorotaxane polymers were formed with reversible chain extension in solution by self-assembly of two complimentary homoditopic molecules with secondary …
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Precursors for perylene diimide dendrimers : synthesis and photophysics
Perylene dyes are photostable and have been used in a variety of applications. However they often display aggregation effects in the solution phase, leading to concentration-dependent electroluminescent (EL) quenching, band broadening, and/or a bathochromic shift. These phenomena not only affect …
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Molecular Modeling Studies of Dendrimers and Hyperbranched Polymers
… the conformational and rheological dynamics of dendrimers and hyperbranched polymers is investigated. Non-Equilibrium Brownian Dynamics (NEBD) simulations are utilized to investigate the single-molecule behavior in the dilute solution and the Tube Model is utilized to investigate the dynamics in …
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Elastin-Like Peptide Dendrimers: Design, Synthesis, and Applications
… side-chain amine) as branching units, ELP dendrimers were synthesized by solid-phase peptide synthesis (SPPS) with up to 155 amino acid residues. A secondary structure change with decreasing ratio of random coil and increasing ratio of β-turn upon heating, which is typical of linear ELPs, …
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Electronic Energy Transfer in Conjugated Organic Dendrimers and Polymers
… examines energy transfer in phenylacetylene (PA) dendrimers and the conjugated polymer poly(2-methoxy 5-[2'-ethylhexyloxy]-p-phenylene vinylene) (MEH-PPV). The fundamental absorbing and emitting chromophores in the PA dendrimers are elucidated via steady-state and time-resolved spectroscopy on …
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Nanofiltration membranes modified with aromatic polyamide dendrimers active layers
… architectures. Amphiphilic aromatic polyamide dendrimers (G1-G3) are synthesized via a divergent approach and used for membrane modification by direct percolation. The permeate samples collected from the percolation experiments are analyzed by UV-Vis spectroscopy to instantly monitor the …
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Part I: Rapid Synthesis of Dendrimers by an Orthogonal Coupling Strategy. Part II: Design, Synthesis, and Characterization of Hydrogen-Bond Mediated Self-Assembling Dendrimers
Part I. Layered dendrimers were rapidly synthesized using an orthogonal coupling strategy. Fourth generation dendron 71 was prepared in four steps by sequential use of two AB$\sb2$ building blocks 66 and 67 under Mitsunobu esterification and Sonogashira coupling conditions. Further accelerated …
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Liquid Crystalline Copper(II) Complexes of Poly(propylene imine) Dendrimers
… systems with taylored physical properties. Dendrimers with donor sites can be used as chelates for metal complexation and their well defined structure enables control over the number and topology of the metal centres. With this motivation new liquid crystalline, polynuclear complexes of …
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Synthesis and modification of pamam dendrimers as histone replacement molecules
… and structurally modify a series of PAMAM dendrimers with a view to investigating and controlling their complexation with, and compaction of, DNA. The Introduction gives an overview to the origins of polymer and dendrimer science, and describes the synthetic approaches and resulting …
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Design, Synthesis, and Characterization of Triazaadamantane Based Monomers and Dendrimers
These triazaadamantane macromolecules may find broad application as drug carriers and for the encapsulation and release of other substances, similar to the Trojan horse strategy. Their ability to act as proton sponges makes them particularly interesting with regards to their potential as artificial …
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Cross-Linked Polybenzyl Ether and Polyglycerol Dendrimers for Monomolecular Imprinting
Dendrimers containing a glycoside core were synthesized by direct coupling of a acid chloride dendron to a glycoside or by attachment of an azide dendron to a core containing alkyne groups using copper-catalyzed 1,3-dipolar cycloaddition. The glycoside dendrimers displayed chiral activity that …
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The synthesis, structure and chemistry of some novel organometallic dendrimers
… novel organometallic dendritic wedges and small dendrimers containing iron, ruthenium, cobalt and tungsten have been investigated. The compounds have been synthesised using the convergent methodology of Hawker and Fréchet. Haloalkyl complexes such as Cp*Fe(CO)₂(CH₂)₃Br and CpRu(CO)₂(CH₂)₃Br were …
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Oxidative Addition As A New Route To Organometallic Polymers And Dendrimers
… new routes to organometallic polymers and dendrimers employing an oxidative addition method. The new complexes {dollar}lbrackrm PtMesb2(NN)rbrack{dollar} 1, (1b: (NN) = 4,4{dollar}spprime{dollar}-di-tert-butyl-2,2{dollar}spprime{dollar}-bipyridine; 1c: (NN) = …
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Star Polymers and Dendrimers Based on Highly Functional Resorcin- and Pyrogallolarenes
… Synthesis of well-defined star polymers and dendrimers with different number of arms and accordingly dendrons, based on calix[4]resorcin- and calix[4]pyrogallolarenes, via convenient polymerization and generation growth reactions and analysis of the obtained products by different methods …
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The Synthesis and Study of Dendrimers and Star Polymers Without Cores
Dendrimers having 16, 24, 32, or 64 alkene groups were synthesized and intramolecularly cross-linked. The combined use of MALDI-TOF MS and SEC analysis of the resulting structures indicated that in each case, as the degree of dendrimer cross-linking increased, its radius of gyration (Rg) decreased …
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A computational and synthetic study of poly(benzyl phenyl ether) dendrimers
… and organochromium poly(benzyl phenyl ether) dendrimers have been investigated by synthetic · and computational methods. The first generation organic benzyl alcohol and bromide wedges have been prepared, and a first generation organic dendrimer was synthesised. The preparation of novel …
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Cyclization and cyclopolymerization of silicon-containing dienes ; Functionalization of carbosilane dendrimers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1997.
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