A GAS-PHASE AND MATRIX-ISOLATION STUDY OF THE EQUILIBRIUM CH3ONO (CIS) REVERSIBLE-ARROW CH30NO (TRANS) BY FTIR SPECTROSCOPY

The gas-phase equilibrium of CH3ONO (cis) reversible arrow CH3ONO (tra ns) has been reinvestigated by FTIR spectroscopy in order to test the assumption that the equilibrium is not disturbed by the quenching proc ess during formation of an Argon matrix. We are able to show that for this system this assumption is valid because the resulting thermodynam ic parameters K-x(298) = 0.7 +/- 0.1, Delta H-R degrees = 3.5 +/- 0.2 kJ mol(-1), and Delta S-R degrees = 8.5 +/- 1 J mol(-1) K-1 for the ma trix experiments are identical within experimental error limits to tho se obtained by other methods. In addition, for several infrared band p airs of both isomers, the relative extinction coefficients are determi ned.