Extending supramolecular fullerene-porphyrin chemistry to pillared metal-organic frameworks.
Porphyrins and fullerenes are spontaneously attracted to each other. This supramolecular recognition element can be exploited to produce ordered arrays of interleaved porphyrins and fullerenes. C(60) x H(2)TpyP x Pb(NO(3))(2) x 1.5TCE (H(2)TpyP = tetra-4-pyridylporphyrin; TCE = 1,1,2,2-tetrachloroethane) crystallizes in the tetragonal P4/n space group and the structure has been solved to high resolution. The Pb(2+) ions connect the pyridylporphyrins in infinite sheets with an interlayer spacing of 12.1 A. The fullerenes are intercalated between these layers, acting as pillars. The 6:6 ring juncture bonds of C(60) are centered over the porphyrins, bringing the layers into strict tetragonal register. This arrangement identifies the fullerene-porphyrin interaction as a structure-defining element. The same motif is seen in a related ribbon structure having C(70) intercalated into HgI(2)-linked H(2)TpyTP. The supramolecular design principles involved in assembling these chromophores may have applications in materials science.
Sun
Dayong
D
Department of Chemistry, University of California, Riverside, CA 92521-0403, USA.
Tham
Fook S
FS
Reed
Christopher A
CA
Boyd
Peter D W
PD
D002244:Carbon / Q000737:chemistry*; D037741:Fullerenes; D007854:Lead / Q000737:chemistry*; D008024:Ligands; D008422:Materials Testing; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D011166:Porphyrins / Q000737:chemistry*; D014961:X-Ray Diffraction
D037741:Fullerenes; D008024:Ligands; D008670:Metals; D011166:Porphyrins; D007854:Lead; D002244:Carbon; C069837:fullerene C60