Interestingly, the directions of the polarization and exchange contributions in propSAPT can vary. For example, for CO 2 •••N 2 system in the global minimum (min1), the polarization contribution is positive (pointing towards N 2 ), and the exchange contribution is negative (pointing towards CO 2 ) at both distances. In contrast, for Ar•••BF 3 , the situation is exactly reversed (see Table ). Moreover, both polarization and exchange contributions may be in the same direction simultaneously, as is observed for the (min2) configuration of the CO 2 •••N 2 complex. Furthermore, these contributions also vary significantly in magnitude.