  In this work, accurate calculations of standard enthalpies of formation of
chlorine fluorides (ClF$_n$, n=1--7; Cl$_2$F and Cl$_3$F$_2$) were performed
through the isodesmic reactions scheme. It is argued that, for many chlorine
fluorides, the gold standard method of quantum chemistry (CCSD(T)) is not
capable to predict enthalpy values nearing chemical accuracy if atomization
scheme is used. This is underpinned by a thorough analysis of total atomization
energy results and the inspection of multireference features of these
compounds. Other thermodynamic quantities were also calculated at different
temperatures. In order to complement the energetic description, elimination
curves were studied through density functional theory as a computationally
affordable alternative to highly correlated wave function-based methods.
