Intermolecular interactions in the crystalline state of some organotellurium antioxidants

The X-ray crystal structure analysis was performed for single crystals of bis (4-aminophenyl) telluride (1), bis [4-(N,N-dimethylamino)phenyl] telluride (2) and his 4-hydroxyphenyl telluride hemihydrate (3). The molecules of the diaryl tellurides 1-3 display two types of non-planar conformations: 'butterfly' and 'T-shaped'. They differ in the torsion angles around Te-C bonds. Intermolecular hydrogen bonds occur between water molecules and hydroxyl groups in compound 3 and also between phenyl rings and proton donors in compounds 2 and 3 with -H(...)pi distances 2.56(8)-2.95(6) A. Also, in compounds 1 and 2 short -H(...)pi contacts (3.02(4)-3.29(5) Angstrom) were observed. (C) 2002 Elsevier Science B.V. All rights reserved.