Systematic testing of Gaussian and complete basis set methods with dispersion corrections for environmentally relevant clusters

- Gn and CBS-x theory applied to probe non-covalent interactions in 47 clusters.
- Best results for CBS-APNO, G4 best for large clusters and CBS-QB3 if cost important.
- Long-range behavior of Gn and CBS-x improved with dispersion-sensitive DFT.
- M05-2X/CBS-QB3 hydrogen-bonding and stacking energies close to CCSD(T)/CBS values.