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Showing 1 to 20 of 33 for “"Association Constants"”.
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Effect of temperature on the association constants of some divalent metal ions with chloride in sea water-like solutions
<p>Association constants for the formation of lead (II) chloride complexes were studies in aqueous solutions also containing copper (II) and cadmium (II) ions.</p><p>The ionic strength was adjusted with sodium perchlorate to resemble that of sea water. The temperature was set at fixed values …
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Self-Assembly: Synthesis and Complexation of Crown Ethers and Cryptands with R2-NH2 Ions
… emphasis on determining the stoichiometries and association constants of the complexations in solution using NMR spectroscopy. The stoichiometry of the complexes was determined by the mole ratio method and the association constants were calculated graphically. Bis-(m-phenylene)-26-crown-8 did not …
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A Hydrodynamic Method for Measuring Aqueous Nanoparticle Surface Interactions
… interactions are presented in this work as association constants where the solutes have interacted with the surface of the nanoparticles. By understanding these nanoparticle-solute interactions, in part through association constants, the scientific community will better understand how …
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The supramolecular modification of trans-resveratrol and related antioxidant molecules
… acids. The thermodynamic parameters and association constants for complexation between hydroxycinnamic acids and both β- and γ-CD were determined by isothermal titration calorimetry (ITC). For β-CD a 1:1 host-guest ratio was found with association constants in the range 246-774 M⁻¹. The …
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INTERACTION OF POLYCYCLIC AROMATIC HYDROCARBONS WITH DISSOLVED AND SEDIMENT ASSOCIATED HUMIC MATERIALS (NMR, FLUORESCENCE)
… quenching method was developed for determining association constants of polycyclic aromatic hydrocarbons (PAH)s with dissolved and sediment bound humic materials. The technique is based upon the observation that PAH fluorescence in aqueous solution is quenched upon association with humic …
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Ion Pairing in Aqueous Metal Sulfates and Platinum Group Metal Ammonium Solutions
… Historically the calculation of ion pair association constants from computer simulations has been complicated due to the difficulty in validating metal ion force fields for solution simulations. In this thesis a force field for divalent metal ions in metal sulfate solutions (i.e. Mg2+SO4 …
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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
… 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 implementation of pyridyl cryptands based on dibenzo-30-crown-10 was made a priority. An efficient method …
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Design, Preparation and Characterization of Novel Pseudorotaxanes, Semirotaxanes, Rotaxanes, Non-Covalent Supramolecular Polymers and Polycatenanes
… rotaxanes and catenanes, with high association constants, enhanced yields and the abilities to respond to external stimuli are of great importance and significance due to their topological novelty and potential application. The convergence of supramolecular chemistry with polymer …
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Beneficiation of selected pesticides and an antihyperlipidemic agent via cyclodextrin complexation and co-crystallization
… of fenthion by β-CD, the respective 1:1 association constants being 737 ± 108 M⁻¹, 412 ± 53 M⁻¹ and 789 ± 170 M⁻¹. For solubilisation of fenthion by (2-hydroxypropyl)-β-CD and randomlymethylated β-CD, AN- and AP-type behaviours were recorded respectively, with association constants 1863 ± …
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Synthesis and Properties of Selectively Modifiable Cyclodextrin Analogues
… dye 8-anilino-1-naphthalene sulfonate with an association constant of 38 +/- 10 M-1. In addition, the synthesis of a monosaccharide cyclotrimer and a disaccharide cyclodimer is presented that were demonstrated to complex 2,4-hexadiyne-1,6-diol with association constants of 8.8 +/- 1.5 M -1 and …
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Synthesis and Characterization of Polyamine Bicycles for Anion Binding
… Cl- ion and a H2O molecule occupied the cavity. Association constants for the anions, determined by NMR titrations in aqueous solution at pH 5, revealed Log K = 3.15(5) and 3.37(3) for F- and Cl-, respectively. Aspects of the binding of halides, the HSO4- ion, and the SO42- ion in the …
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Spectroscopic Studies of Inclusion Host-Guest Complexes Between Cyclophane Corrals and Polcyclic Aromatic Hydrocarbons
… are presented in this thesis. The stability constants, log Ka, for the C-A, C-F and C-P complexes are determined using absorption and fluorescence spectroscopy. Heats of formation of corral 2 complexes were determined by measuring the complex association constants at 25, 29 and 32 °C. Results …
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Structures of Werner clathrates
… Attempts have been made to estimate the association constants of sore of these computed in solution by proton nuclear magnetic resonance spectroscopy.
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Cyclodextrin Assisted Enantiomeric Recognition of Amino Acid Imides and Toward Synthesis of Dolabellane Diterpenoid B
… resolution was demonstrated by calculating association constants of this host-guest system. Dolabellane diterpenoids share the unique feature of a trans-bicyclo[9.3.0]tetradecane and most of them express antimicrobial, antitumor and antiviral activities. They are primarily obtained from …
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Further investigation of capillary electrophoresis for pharmaceutical analysis
… research tool. The determination of the association constants of steroid hormones with cyclodextrins is successfully achieved from the electrophoretic mobilities. A range of different types of natural and derivatised cyclodextrins is investigated. This straightforward approach marks the …
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Using Molecular Design to Influence Intermolecular Interactions
… and fullerenes are explored in solution. Association constants were determined by fluorescence quenching experiments with fullerenes C70, C60, and Phenyl-C61-butyric acid methyl ester (PCBM). NMR titration experiments mimic fluorescence quenching results that suggest that association in …
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The Chemistry of Fullerenes, Polymers, and Host/Guest Interactions
… explored in this work. The measurements of the association constants for these systems will aid in the ongoing synthesis of new host/guest systems. Ion containing polymers were synthesized and characterized for their use in electroactive devices. Imidazolium containing polymers with bulky anions …
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A STUDY OF THE THERMODYNAMICS OF ANION BINDING TO HUMAN SERUM TRANSFERRIN
… nonsynergistic anions, two in each domain. The association constants are reported.</p><p>It is unlikely that the anions bind to a significant extent at the sites occupied by the synergistic anion since none of them facilitates iron binding in the absence of bicarbonate. It is more likely that …
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Helical Pitch, Hydrophobic Binding, Chiral Templation, and Supramolecular Chelation of M-Phenylene Ethynylene Foldamers
… of acetonitrile. It was found to have an association constant with (-)-alpha-pinene of 1.4 +/- 0.09 x 106 M-1 in 90% water in acetonitrile, which was much higher than predicted from linear extrapolation in previous studies of less soluble oligomers. A mPE oligomer with a helicene moiety in …
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Computer simulation of titration behavior in proteins
… and paratope structure, but have widely varying association constants, are studied. In addition to electrostatic techniques, results of contact mapping and molecular surface area and volume calculations aid in the understanding of the differing properties of these systems. Several modeled mutant …
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