Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Infrared Spectra of CICN+, CINC+, and BrCN+ Trapped in Solid Neon



Marilyn E. Jacox, Warren E. Thompson


When a mixture of ClCN or BrCN with a large excess of neon is codeposited at 4.3 K with a beam of neon atoms that have been excited in a microwave discharge, the infrared spectrum of the resulting solid includes prominent absorptions of the uncharged isocyanide, ClNC or BrNC, and of the corresponding cation, ClCN+ or BrCN+. The NC-stretching fundamentals of the isocyanides trapped in solid neon lie close to the positions for their previously reported argon-matrix counterparts. The CN-stretching absorptions of ClCN+ and BrCN+ and the CCl-stretching absorption of ClCN+ appear very close to the gas-phase band centers. Absorptions of two overtones and one combination band of ClCN+ are identified. Reversible photoisomerization of ClCN+ to ClNC+ occurs. The two stretching vibrational fundamentals and several infrared and near infrared absorptions associated with electronic transitions of ClNC+ are observed. Minor infrared peaks are attributed to the vibrational fundamental absorptions of the CX and CX+ species (X = Cl, Br).
Journal of Chemical Physics


BrCN+, CBr, CBr+, CINC+, infrared spectrum, neon matrix, photoisomerization


Jacox, M. and Thompson, W. (2007), Infrared Spectra of CICN<sup>+</sup>, CINC<sup>+</sup>, and BrCN<sup>+</sup> Trapped in Solid Neon, Journal of Chemical Physics, [online], (Accessed June 15, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created June 27, 2007, Updated February 17, 2017