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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Cryptands"”.
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Synthesis and host-guest interaction of cage-annulated podands, crown ethers, cryptands, cavitands and non-cage-annulated cryptands.
… host-guest behavior. A series of cage-annulated cryptands, cavitands and the corresponding non-cage-annulated model compounds have been synthesized. These host molecules display unusual behavior when examined by using ESI-MS techniques, i.e., they bind selectively to smaller alkali metal ions …
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Synthesis and properties of novel cage-functionalized crown ethers and cryptands.
… study of a series of cage-functionalized cryptands and their alkali metal-complexes was performed. The X-ray crystal structure of a K+-complexed bis-cage-annulated 20-crown-6 was obtained. The associated picrate anion was found to be intimately involved in stabilization of the host-guest …
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Efficient Syntheses of Strong Binding Cryptands and their Derivatives for Supramolecular Polymer Synthesis
… strongly associating crown ether-based cryptands is desired for pseudorotaxane complexation of bipyridinium guests to produce suprapolymers and supramolecularly-linked block copolymers. Cryptands based on bis(meta-phenylene)-32-crown-10 (BMP32C10) were synthesized. The functionality of …
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Synthesis and investigation of hexacarboxamide cryptands as anionic binucleating ligands by Glen E. Alliger.
We have investigated the use of hexacarboxamide cryptands as sextuply anionic binucleating ligands. Two homobimetallic complexes of a t-butyl-substituted cryptand, featuring manganese(II) ion and cobalt(II) ions, have been synthesized. The manganese species features a bridging hydroxide ligand; …
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Self-Assembly: Synthesis and Complexation of Crown Ethers and Cryptands with R2-NH2 Ions
The focus of the following research was to use the self-assembly process to create rotaxanes between several large bisphenylene crown ethers (> 22 atoms) with secondary ammonium salts. Also of great interest was to understand the complexation behavior of the crown ethers with the salts, with …
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I. Functionalization and Investigation of Highly Efficient Hosts for Use in Macromolecular Self-Assemblies and II. The Design and Synthesis of ROMP Imidazolium Systems for Use as Mechanical Actuators
… Systems caught in this trap were the pyridyl cryptands of dibenzo-30-crown-10 and bis(m-phenylene)-32-crown-10 paired with paraquat. Exceptionally high association constants in the range of 105 to 106 have been observed for these systems, but their applications have been hindered. Easing the …
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Syntheses and structures of some polyoxomolybdates and polyoxotungstates
… given way to three-dimensional shapes including cryptands, cavitands and ultimately capsules, designed to encapsulate molecular hosts. Now the emphasis is shifting from structure to function, as researchers are trying to make the nanoscale capsules work for them. This is possible through the …
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Design, Preparation and Characterization of Novel Pseudorotaxanes, Semirotaxanes, Rotaxanes, Non-Covalent Supramolecular Polymers and Polycatenanes
… state for the first time. Two novel BMP32C10 cryptands, bearing covalent and metal complex linkages, were designed and prepared. By employing the self-assembly of these biscryptands, which can be viewed as AA monomers, and a bisparaquat, which can be viewed as a BB monomer, the first …
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Studies On The Physicochemical Properties Of Eu2+ Cryptates: Implications To Contrast Agents For Magnetic Resonance Imaging
… work in the Allen lab demonstrated that modified cryptands can stabilize the divalent state of Eu. Because of the favorable properties of Eu<sup>2+</sup> and the ability of cryptands to oxidatively stabilize Eu<sup>2+</sup>, I hypothesized that Eu<sup>2+</sup>-containing cryptates could serve as …
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Synthesis and characterization of phosphorous containing macromolecular polyether compounds
… emission tomography. Neutral crown ethers and cryptands have been studied as carrier ligands for Rb<sup>+</sup> but exhibit low ion carrying capacity and high toxicity. The present study involved investigating a lariat ether containing an ionizable phosphoryl moiety and a lipophilic sidearm. …
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Host-Guest Systems Based on Crown Ether, Cryptand, and Pseudocryptand Hosts with Paraquat, Diquat, Secondary Ammonium, and Monopyridinium Salt Guests
… not only that bis(m-phenylene)-32-crown-10-based cryptands are powerful hosts for paraquat derivatives compared with the simple crown ether, but also that cooperative complexation can be obtained with the cryptand structure. It was shown that the significant improvement in complexation was the …
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Enhanced Architectural and Structural Regulation Using Controlled Free Radical Polymerization Techniques; Supramolecular Assemblies: Pseudorotaxanes and Polypseudorotaxanes
Due in large part to the growth and development of reliable surface characterization techniques, as well as to advances in the physical and chemical techniques used to modify surfaces, the technology of surface modification has seen rapid expansion over the past two decades. A major thrust of this …