A Novel Macrocyclic Dimeric Dicarboxylato Distannoxane Assembled from a Flexible Dicarboxylic Acid

Abstract

The novel macrocyclic complex [(Bu2Sn)2OL]2•CH3CN (2) has been prepared from the flexible dicarboxylic acid, LH2, (1). Single crystal X-ray diffraction shows that complex 2 has a centrosymmetric structure, with a central rhomboid cyclic Bu4Sn2O2 unit, linked at the oxygen atoms to two exocyclic tin atoms. The dicarboxylate ligands bridge exocylic and endocyclic tin atoms, completing two rings each of 22 atoms, and two of the four carbonyl oxygen atoms coordinate to the exocyclic tin atoms, to raise their coordination state to five and complete two more six-membered, rings.