Interactions of ThO(X) with He, Ne and Ar from the ab initio coupled cluster and symmetry adapted perturbation theory calculations

► CCSD(T): ThO-RG - floppy van der Waals complexes with bent equilibrium structure. ► Rovibrational energy levels: spatial RG localization decreases from He to Ar. ► SAPT qualitative: delicate balance between exchange and dispersion forces. ► SAPT quantitative: problems with intramonomer correlation and core potentials. ► Long-range interactions: peculiar reduction of the dispersion anisotropy.