Interaction of carbon monoxide with alkali, alkaline-earth, transition, and lanthanoid metal fluorides in an argon matrix

Abstract

The vibrational frequency of carbon monoxide has been measured for carbon monoxide when it interacts with uni-, bi-, and tri-valent metal fluorides in argon matrices. It is found to shift to higher values relatives to free carbon monoxide in all cases. The shifts vary with the reciprocal of the metallic ionic radius within an isovalent group. Use of the positive shift as a relative measure of ionic character within an isovalent group is suggested.