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Showing 1 to 20 of 138 for “"macrocycle"”.
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Iron macrocycle complexes
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Chemistry.
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Effects of shape, conformation, and symmetry on macrocycle synthesis via alkyne metathesis
… well-defined shapes and π-systems of conjugated macrocycles enable systematic modulation of these structures for self-assembly into functional organic materials. However, most synthetic methods rely on kinetically controlled reactions that often afford complex mixtures and low yields of a desired …
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NMR characterization of a diiron macrocycle and structural characterization of a diketo derivative
… (TIED = tetraiminethylene dimacrocycles). Two isosbestic points were found at 538 and 371 nm.</p><p>The diketo-dimer's crystals appear to have individual colors, a physical characteristic called pleochroism. Pleochroism is a topic in the study of optical crystallography which …
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Carbon Paste Macrocycle Doped Composite Electrodes for the Selective Electrochemical Detection of Dopamine
… number of carbon paste electrodes modified with macrocycles for the electrochemical detection of DA is reported. The different macrocycles employed were based on cyclodextrin derivatives and consist of sulfated β-CD (S-β-CD), carboxymethyl β-CD (CM-β-CD), Ferrocene complex β-CD (Fc-β-CD), …
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Photochemical synthesis of dihydroquinolinones and their investigation toward macrocycle synthesis via ring expansion
… azithromycin are currently approved antibiotics. Macrocycles are also used to treat other infectious diseases, for example, natamycin and amphotericin B are used as antifungal agents and ivermectin is used as an antiparasitic agent.1 The synthesis of macrocyclic compounds is typically done using …
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Development of a Highly Active Molybdenum Catalyst for Alkyne Metathesis and Its Application in Polymer and Macrocycle Synthesis
Made available in DSpace on 2015-09-25T22:13:29Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3199196.pdf: 5657805 bytes, checksum: c6c833dc3777c1d82e313b1d924659d5 (MD5) Previous issue date: 2005
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Functional Materials From Self-Assembled Macrocycles
… variety of applications. A bis-urea phenylether macrocycle self-assembled into columns and could serve as a `nanoreactor' to form host:guest complex with small molecules such as methylstyrene, divinylbenzene and iodine; a larger macrocycle with phenylethynylene pyridine space has also been …
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SYNTHESIS AND CHARACTERIATION OF WATER SOLUBLE C2 AND C3 SYMMETRIC MULTI-CALIX[4]ARENE DENDRIMERS AND PILLARARENES A NOVEL CLASS OF MACROCYCLE IN SUPRAMOLECULAR CHEMISTRY
In this PhD work it was carried non-covalent synthesis of supramolecular modular systems homo-and hetero-component, through the use of pillararenes and calixarenes coupled to porphyrins; in particular it was designed to the preparation of discrete assembled at the nanoscopic level, by means of …
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Synthesis and characterisation of novel α-functionalised phosphoryl derivatives
… acids, α-aminoalkylphosphonic acids and macrocycles containing these sub-units. There are two broad types of macrocyclic systems that are targeted: (i) C-functionalised α-aminophosphonic acids; and (ii) N-functionalised α-aminophosphonic acids. A novel N-functionalised macrocycle ring …
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The structure and reactivity of metallohydroporphyrins
… been reduced at one or more of the porphyrin macrocycle positions. Such complexes have been identified as being essential in a variety of biological systems including nitrite and sulfite reductases and S-methyl coenzyme M reductase. Of particular interest is the highly reduced …
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Synthesis and characterization of phosphorous containing macromolecular polyether compounds
… metal cation complexes indicates that a macrocycle containing more than 18 but less than 21 atoms can incorporate Rb<sup>+</sup> ion in its cavity. Molecular modeling of some of the complexes of phospho-lariat ethers with rubidium using the Spartan'02 software package revealed that a …
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Solution Properties of Some Iron and Copper Macrocycles.
… iron(ll) phthalocyanine (FePc) and three copper macrocycle complexes. Concentrations of saturated solutions of FePc in pyridine, 2-methylpyridine, 3-methy1 - pyridine, and 4-methyl pyridine were determined from visible spectral data, and in dimethyl sulfoxide (DMSO) were obtained from atomic …
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Design and synthesis and testing of conformationally constrained peptidomimetics.
… and inhibitors in a β-strand conformation. Four macrocycles, designed to be preorganised in a β-strand geometry, were synthesised by ring closing metathesis (compounds 3.02 – 3.05). Macrocycle 3.02 was made to investigate the suitability of an N-terminal 4-fluoro-benzyl-sulfonyl (FBS) in …
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Topologically constrained DNA intercalators: Synthesis and DNA binding studies
… by linker chains at the 4- and 9-positions. Macrocycles 31 and 32 are linked via spermine at the 9-position and have been shown to bind to DNA by bisintercalation using absorption spectroscopy titrations, thermal denaturation studies, and viscometric titrations of both calf thymus DNA and …
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Molecular necklaces: polyester rotaxanes
… of 30-60 membered aliphatic crown ether macrocycles whose cavities are pierced by polysebacate chains were synthesized by several polymerization approaches including transesterification polymerization, the acid chloride method, and interfacial polymerization. The polyrotaxanes were …
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Effects of non-planar distortions in porphyrin compounds on their properties and functionality
… the effects of out-of-plane distortions of the macrocycle on optical properties, reactivity to axial ligands, and substituent rotation. The structure-functions relationships are examined using molecular simulations, UV-visible absorption spectroscopy, resonance Raman spectroscopy, and …
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Electrochemistry, Acid-base Properties and Spectroelectrochemistry of Porphyrins, Corroles, and Related Molecules
… were then discussed in different solvents. Each macrocycle not only exhibits well-defined ring-centered oxidations and ring-centered reductions, some of which has a metal-centered electron transfer but also has the electroactive peripheral substituents (N-alkylpyridyl groups in the case of …
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Distal hydrogen-bonding effects and cofacial bimetallic salen architectures for oxygen activation chemistry
… structural scaffolds elaborated from Schiff-base macrocycles were designed to study the proton-coupled electron transfer chemistry of 0-0 bond forming and activation chemistry. The "Hangman" architecture is composed of hydrogen-bonding functionalities poised over a redox active manganese salophen …
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