Estimates of the ab initio limit for sulfur-Pi interactions: The H(sub 2)S-benzene dimer

A study is conducted to examine H(sub 2)S-benzene dimer as the simplest model of sulfur-Pi interactions. Analysis of the interaction using symmetry-adapted perturbation theory, along with potential energy curve for rotation of the H(sub 2)S unit relative to the benzene ring, suggests that the sulfur-Pi interaction is an electrostatic attraction between the partial positive hydrogen in H(sub 2)S and the negatively charged Pi electrons of benzene.