FT-IR spectra of 90 K films of simple, mixed, and double clathrate hydrates of trimethylene oxide, methyl chloride, carbon dioxide, tetrahydrofuran, and ethylene oxide containing decoupled D/sub 2/O

Journal Article · Thu Feb 11 04:00:00 EST 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100314a013· OSTI ID:5325411

Fleyfel, F; Devlin, J P

The spectroscopic investigation of clathrate hydrates prepared by using low-temperature thin-film techniques has been extended to several new gases. These gases have included a highly polar gas (trimethylene oxide or TMO) the simple hydrate of which grows readily from a vapor beam at 120 K, a slightly less polar gas (methyl chloride) the simple hydrate of which grows if the vapor beam is incident onto a crystalline clathrate hydrate base at 125 K, and a nonpolar gas (carbon dioxide) which apparently can only be enclathrated as the mixed hydrate by using a highly polar help gas (e.g., ethylene oxide (EtO)). These structure I hydrates as well as the structure II hydrate of tetrahydrofuran have been prepared under conditions of temperature/base-doping such that no mobile protons exist during the deposit. As a result, it has been possible to isolate intact D/sub 2/O molecules in the water network of the crystalline hydrates. The guest-molecule spectra, all obtained at 90 K, show (a) the apparent generality of the rule that guest-molecule stretching-mode frequencies decrease with an increase in cage size and (b) that the effective size of the structure I small cage increases as the size of the molecule occupying the large cage increases.

• Research Organization: Oklahoma State Univ., Stillwater (USA)
• OSTI ID: 5325411
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:3; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHLORINATED ALIPHATIC HYDROCARBONS
CLATHRATES
DATA
ENERGY LEVELS
EPOXIDES
EXCITED STATES
EXPERIMENTAL DATA
FILMS
FLUIDS
FOURIER TRANSFORM SPECTROMETERS
FURANS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HEAVY WATER
HETEROCYCLIC COMPOUNDS
HYDRATES
HYDROGEN COMPOUNDS
INFORMATION
INFRARED SPECTRA
LOW TEMPERATURE
MEASURING INSTRUMENTS
METHYL CHLORIDE
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SPECTRA
SPECTROMETERS
STRUCTURAL CHEMICAL ANALYSIS
TETRAHYDROFURAN
VIBRATIONAL STATES
WATER