Porphyrinic groups linked scaffold

Photochromism has also been observed when two porphyrinic groups are linked to a dithienylethene scaffold. The closed form showed an absorption band at 560 nm (01JA1784). The same behavior was observed in the system 318-319 (02AM918). Dithienylethene photochromic systems have also been described to be linked to single-walled nanotubes (07JA12590). 

Additional saccharide receptors based on the picket-fence porphyrin were developed by the Bonar-Law group, but these were found to bind saccharides strongly only in nonpolar media. The starting material, the a,a,a,a-atropisomer of 5,10,15,20-me5O-tetrakis(o-aminophen-yl)porphyrin, 1 (cf. Figure 3), was functionalized with four different amino acid esters that were linked to the porphyrin scaffold by urea groups this yielded receptors 18a-d... 

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