A high-resolution analysis of the {ν2, ν3} and {ν4, ν6} bands of the two isotopomers of chloryl fluoride F35ClO2 and F37ClO2 has been carried out for the first time using simultaneously infrared spectra recorded around 16μm and 26μm with a resolution of ca. 0.003 cm−1 and microwave and submillimeter-wave transitions occurring within the vibrational states 21, 31, 41, and 61. Taking into account the Coriolis resonances which link the rotational levels of the {21, 31} and the {41, 61} interacting states, it was possible to reproduce very satisfactorily the observed transitions and to determine accurate vibrational energies and rotational constants for the upper states 21, 31, 41, and 61 of both the 35Cl and 37Cl isotopic species.