title: Synthesis of oxacalixarene-locked bisporphyrins and higher oligomers.
abstract: The efficient one-step synthesis of oxacalixarene-bisporphyrins and higher oligomers from readily available starting materials is described. The X-ray structure of one oxacalix[4]arene-locked cofacial bisporphyrin, prepared in 91% yield, shows an 1,3-alternate conformation of the molecule with partial overlap of the two porphyrin rings. 1H NMR data supports a similar conformation in solution. The absorption and emission spectra of oxacalixarene-porphyrins are briefly discussed.
authors.affiliation: Department of Chemistry, Louisiana State University, Choppin Hall, Baton Rouge, LA 70803, USA.
authors.forename: Erhong
authors.initials: E
authors.lastname: Hao
authors.forename: Frank R
authors.initials: FR
authors.lastname: Fronczek
authors.forename: M Graça H
authors.initials: MG
authors.lastname: Vicente
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D008968:Molecular Conformation; D011166:Porphyrins / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D011166:Porphyrins; D047250:Calixarenes