The interactions between NH 3 , its methylated and chlorinated derivatives and CS 2 are investigated by ab initio CCSD(T) and density functional BLYP-D3 methods. The CCSD(T)/aug-cc-pVTZ calculated interaction energies of complexes characterized by the SÁÁÁN chalcogen bonds range between 21.71 and 22.78 kcal mol 21 . The SÁÁÁN bonds are studied by atoms in molecules, natural bond orbital, and noncovalent interaction methods. The lack of correlation between the interaction energies of methylated amines complexes and the electrostatic potential results from the lone pair effect in aliphatic amines. Different structures of CS 2 complexed with ammonia derivatives, stabilized by other than the SÁÁÁN chalcogen bonds, are also predicted. These structures are characterized by interaction energies ranging between 1.15 and 3.46 kcal mol 21 . The results show that the complexing ability of CS 2 is not very high but this molecule is able to attack the electrophilic or nucleophilic sites of a guest molecule. K E Y W O R D S BLYP-D3, CCSD(T), chalcogen bond, lone pair effect, SÁÁÁN bond Int J Quantum Chem. 2017;117:e25369.