ISSN:
1573-1111
Keywords:
Crown ethers
;
solvent-macrocycle interactions
;
microwave dielectric relaxation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Microwave complex permittivities,ɛ* =ɛ′ -Jɛ″, are reported in the 1–90 GHz frequency range for the macrocycles 18-crown-6 (18C6) and 15C5 added to acetonitrile in stoichiometric proportions, in the solvent CCl4 at 25°C. Digitized infrared spectra of the ‘CN stretch’ ν2 vibration of acetonitrile for the same systems are reported in the 2300–2200 cm−1 spectral region. The macrocycle 12C4 added to CH3CN has also been investigated in the infrared. Both the dielectric relaxation and infrared results are interpreted in terms of macrocycle-acetonitrile interactions, probably involving a methyl-hydrogen to ethereal-oxygen interaction. These interactions with CH3CN diminish in strength according to the sequence: 18C6 〉 15C5 〉 12C4.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01053865
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