WEAK INTERACTIONS IN MOLECULAR CRYSTALS CONTAINING SULFUR

Teresa Borowiak

Faculty of Chemistry, Adam Mickiewicz University, ul. Grunwaldzka 6, 60-780 Poznan, Poland.
e-mail: borowiak@main.amu.edu.pl

Keywords: non-bonded intramolecular S···S interactions

Most existing studies of non-covalent interactions at sulfur have concentrated on the divalent Y-S-Z case. Among them, sulfur - nucleophile interactions have been well recognized, in particular for the case of S···O short intramolecular nonbonded contacts [1].

We have recently found in ortho-substituted 3,4'-diquinolinyl sulfides, besides S···O interactions, also short intramolecular 1,4 - non-bonded S···S contacts, much shorter than the van der Waals radii sum of 3.6 [2].

Their geometry is eclipsed and similar to 1,4 - S···O non-bonded contacts. Molecular conformation of 3,4'-diquinolinyl sulfides is controlled by these two effects in a similar way as the crystal packing of divalent sulfur compounds described by T.N. Guru Row and R. Parthasarathy [3].

The short 1,4 and 1,5 non-bonded intramolecular short contacts S···S have been also studied using crystallographic data retrieved from the Cambridge Structural Database and an overview in this area will be given .

1. A.Kucsman, I.Kapovits, in Organic Sulfur Chemistry, edited by F. Bernardi, I.G.Csizmadia and A.Mangui, (1985) pp. 191-245, Amsterdam: Elsevier.
2. A. Bondi, J. Phys. Chem. 68 (1964) 441-451.
3. T.N.Guru Row, R.Parthasarathy, J. Am. Chem. Soc. 103 (1981) 477-479.