Infrared spectra of the M$sup +$HBr$sub 2$$sup -$ and the M$sup +$HClBr$sup -$ ion pairs and their deuterium analogs isolated in argon matrices at 15 K

Journal Article · Mon Mar 01 04:00:00 EST 1976 · J. Chem. Phys., v. 64, no. 5, pp. 1986-1993

OSTI ID:4089184

Ault, B S; Andrews, L

The matrix reactions of alkali bromide salts and HBr and DBr have been investigated in argon matrices. In each case, an intense band was observed from the reaction product, which was assigned to the antisymmetric stretch, $nu$$sub 3$, of the HBr$sub 2$$sup -$ and DBr$sub 2$$sup -$ anions in the M$sup +$HBr$sub 2$$sup -$ and M$sup +$DBr$sub 2$$sup -$ ion pairs. Comparisons to literature spectra, in conjunction with quartic deuterium shifts, indicate that the anion has a linear, centrosymmetric geometry in the isolated ion pair. A less intense band was also observed which has been assigned to the combination band $nu$$sub 1$$+$$nu$$sub 3$ for the HBr$sub 2$$sup -$ anion. Reaction of alkali bromide salts with HCl and alkali chloride salts with HBr have been shown to yield identical absorptions for the M$sup +$HClBr$sup -$ ion pairs. The spectra suggest that both type I and type II HClBr$sup -$ anions exist, and the resulting form may be determined by cation position. (AIP)

• Research Organization: Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901
• NSA Number: NSA-33-028482
• OSTI ID: 4089184
• Journal Information: J. Chem. Phys., v. 64, no. 5, pp. 1986-1993, Journal Name: J. Chem. Phys., v. 64, no. 5, pp. 1986-1993; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

*DEUTERIUM-- ISOTOPE EFFECTS
400202* --Chemistry--Inorganic & Physical Chemistry--Isotope Effects
ALKALI METAL COMPOUNDS
BROMIDES
HYDROBROMIC ACID
HYDROCHLORIC ACID
INFRARED SPECTRA
ION PAIRS
N40220* --Chemistry--Inorganic
Organic
& Physical Chemistry--Isotopic Effects