Near-infrared spectral studies for investigating the hydration of 18-crown-6 in aqueous solutions

Article Abstract:

The mechanism of hydration of the 18-crown-6 molecule has been investigated in aqueous solution using the near-infrared spectral technique. In addition, the hydration numbers of the molecule at various concentrations were examined. Results show near-infrared difference spectra of 18-crown-6 molecule in the 1350-1650 nm region. Four complexed water molecules were found to be hydrogen-bonded to the crown ether ring with D(sub 3d) conformation.

Hydration, Rehydration solutions, Cyclic compounds, Crown ethers

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SAFT association parameters from FTIR for blank, monohydroxy, and dihydroxy PIB 200 in ethane, carbon dioxide, and chlorodifluoromethane

Article Abstract:

A study was conducted to measure the phase-boundary pressures of non-functional or blank monohydroxy and dihydroxy polyisobutylene (PIB) oligomers weighing close to 200 g/mol in ethane, carbon dioxide and chlorodifluoromethane. Results of the investigation were compared to existing literature data for 2,5-hexanediol and were analyzed using the statistical associating fluid theory model.

Polyolefins, Solution (Chemistry), Solutions (Chemistry), Polybutylene

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