Infrared spectra of alkali metal atom-ammonia complexes in solid argon

Journal Article · Wed Jan 21 04:00:00 UTC 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00236a002· OSTI ID:6895788

Suezer, S; Andrews, L

One-to-one complexes between Li, Na, K, and Cs atoms and NH/sub 3/ have been studied by using matrix IR spectroscopy. New bands at 1133, 1079, 1064, and 1049 cm/sup -1/ are assigned to perturbed nu/sub 2/ modes, and bands at 3277, 3294, 3292, and 3287 cm/sup -1/ are assigned to the perturbed nu/sub 1/ ammonia submolecule modes of the Li--NH/sub 3/, Na--NH/sub 3/, K--NH/sub 3/, and Cs--NH/sub 3/ complexes, respectively. The corresponding bands for K and /sup 15/NH/sub 3/, NH/sub 2/D, NHD/sub 2/, and ND/sub 3/ complexes are also assigned. The intensity ratios of nu/sub 1/ to nu/sub 2/ for the ammonia submolecule modes in the Li, Na, K, and Cs complexes are larger by factors of 15, 20, 30, and 35, respectively, than the corresponding ratio for isolated ammonia. The intensification and position of nu/sub 1/ in the complex and the alkali metal-ammonia interaction are consistent with calculations of a very small ammonia ..-->.. metal charge transfer where the alkali atom acts as a weak Lewis acid for Li and Na. The increased ammonia interaction with K and Cs may suggest a possible acid-base role reversal for the heavier alkali complexes. At higher metal/ammonia concentrations higher aggregate bands of (M)/sub n/--NH/sub 3/ nature are also observed.

• Research Organization: Univ. of Virginia, Charlottesville
• OSTI ID: 6895788
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 109:2; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

090310* -- Inorganic Hydrogen Compound Fuels-- Properties-- (1976-1989)
10 SYNTHETIC FUELS
ABSORPTION SPECTROSCOPY
ALKALI METAL COMPLEXES
AMMONIA
ARGON
CESIUM COMPLEXES
COMPLEXES
CONFIGURATION INTERACTION
DATA
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
INFRARED SPECTRA
LITHIUM COMPLEXES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
NUMERICAL DATA
POTASSIUM COMPLEXES
RARE GASES
SODIUM COMPLEXES
SPECTRA
SPECTROSCOPY