43012-19-7

The reaction of AsCl3 with H2L (where L = a rigid dithiolate) results in the self-assembly of As2L2Cl 2 supramolecular macrocycles. For ligands 4,4′- bis(mercaptomethyl)biphenyl (H21), 4,4′-bis(mercaptomethyl)- trans-stilbene (H22), and 1,4-dimethoxy-2,5-bis(mercaptomethyl) benzene (H23), the macrocyclic cavities of the resulting assemblies are large enough to host aromatic solvent molecules, as revealed by single crystal X-ray structures of the inclusion complexes. As2L 2Cl2 macrocycles form in solution as a mixture of diastereomers, but the diastereomers can be selectively crystallized and separated. Crystallization of syn- or anti-As232Cl 2 can be controlled using host-guest interactions by the prudent choice of crystallization solvents. anti-As232Cl 2 crystallizes exclusively from chloroform and benzene, while a [(syn-As232Cl2)2?p-xylene] dimer crystallizes from p-xylene and a mixture of [(syn-As23 2Cl2)(anti-As232Cl 2)?toluene] and [(syn-As232Cl 2)2?toluene] dimers crystallize from toluene.