Inclusion complexes oriented in thermotropic liquid-crystalline solvents studied with carbon-13 NMR

Article Abstract:

A study on the inclusion complex of cryptophane-A and chloroform dissolved in two stable liquid-crystalline matrices using (super 13)C NMR is presented. The dipolar splitting for the bound ligands was observed to be substantially larger than that obtained for the free ligands, indicating a major increase in ligand ordering. Results reveal the potential for using restored dipolar couplings to analyze structural and dynamical aspects of inclusion complexes in solution.

Usage, Nuclear magnetic resonance, Optical properties, Chemistry, Physical and theoretical, Physical chemistry

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Correlation of temperature dependence of gas permeability with pore size in molecular sieving membranes: A grand canonical ensemble molecular dynamics study

Article Abstract:

The transition boundary of the temperature dependence of small gas permeability through molecular sieving membranes was investigated by the use of grand canonical ensemble molecular dynamics (GCMD). The temperature dependence of H(sub 2), Ne, Ar, O(sub 2), N(sub 2), and CO(sub 2) permeability through molecular sieving membranes was examined by use of membrane models having cylindrical pores with a range of 0.3-0.5 nm.

Molecular Sieves, Molecular dynamics, Permeability

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Predication of the solubility of chloroform in acrylate polymer mixtures with inclusion of the hydrogen-bonding effect

Article Abstract:

The presence of hydrogen bonding in chloroform-acrylate polymer mixtures was demonstrated by observation of (super 1)H and (super 13)C NMR chemical shifts. Comparison of the NMR chemical shifts in polymer solutions with their low molecular weight analogues showed the effect of stearic hindrance on hydrogen bonding.

Analysis, Spectra, Hydrogen bonding, Polymer solutions

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