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Salt and solvent effects on the kinetics and thermodynamics of the inclusion of the ruthenium complex [[Ru[[N[H.sub.3]].sub.5](4,4'-bpy)].sup.2+] in beta-cyclodextrin

Article Abstract:

The influences of solvents and salts on the kinetics and thermodynamics of the inclusion of [[Ru[[N[H.sub.3]].sub.5](4,4'-bpy)].sup.2+] in beta-cyclodextrin (beta-CD) are explored. The solvent effects on the equilibrium constant depend on the stabilization of the 4,4'-bipyridine ligand in a water-cosolvent mixture relative to that in water and the salt effects on the equilibrium constant are interpreted as a consequence of the formation of ion pairing between the anion of the salt and the inclusion complex.

Analysis, Thermal properties, Thermodynamics, Cyclodextrins, Structure, Matter, Kinetic theory of, Kinetic theory

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Rigidity and/or flexibility of calixarenes. Effect of the p-sulfonatocalix[n]arenes (n = 4, 6, and 8) on the electron transfer process [[Ru[(N[H.sub.3]).sub.5]pz].sup.2+] + Co[([C.sub.2][O.sub.4]).sub.3.sup.3-]

Article Abstract:

The reaction [[Ru[(N[H.sub.3]).sub.5]pz].sup.2+] + Co[([C.sub.2][O.sub.4]).sub.3.sup.3-] is analyzed in aqueous solutions of p-sulfonatocalix[n]arene (n = 4, 6, and 8) and the results are interpreted by using the pseudophase model. The results have shown that the rigidity and/or flexibility of the assembled rings have a significant impact on the thermodynamics of inclusion of the guest into the host and on the kinetics of the electron transfer processes that take place in these media.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Nitrogen Compounds, Usage, Electric properties, Electron transport

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