Synthesis and structures of host molecules containing an Se–Se bond. Intramolecular hypervalent nature of selenium atoms in the crystal state

The first host molecules containing an Se–Se bond, 5,13,20,28-tetraoxo-3,4 : 14,15 :18,19 : 29,30-tetrabenzo-6,9,12,21,24,27-hexaoxa-1,2,16,17-tetraselenacyclotriaconta-3,14,18,29-tetraene (1) and 2,9-dioxo-3,4:7,8-dibenzo-13,15,21,24-tetraoxa-5,6-diselena-1,10-diazabicyclo[8.8.8]hexacosa-3,7-diene (2), have been synthesized and their structures have been determined by X-ray analysis.