Synthesis of oxacalixarene-locked bisporphyrins and higher oligomers.
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.
Hao
Erhong
E
Department of Chemistry, Louisiana State University, Choppin Hall, Baton Rouge, LA 70803, USA.
Fronczek
Frank R
FR
Vicente
M Graça H
MG
D047250:Calixarenes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D008968:Molecular Conformation; D011166:Porphyrins / Q000138:chemical synthesis / Q000737:chemistry*
D011166:Porphyrins; D047250:Calixarenes