A molecular tweezer, zinc porphyrin-dithienylethene-zinc porphyrin (ZnP-DTE-ZnP) triad, has been prepared. Triad ZnPor-DTE-ZnPor showed a little electronic communication among the chromophores judged from the comparison of the steady-state absorption and fluorescence spectra for triads and their component compounds. Irradiation of ZnPor-DTE-ZnPor with UV light converts dithienylethene moiety from open form to closed form. The complexation of ZnP-DTE-ZnP with 4,4'-bipyridyl were investigated by absorption and fluorescence spectroscopic measurements. ZnP-DTE-ZnP forms a 1:1 complex with 4,4'-bipyridyl. The stability constants of log K=4.0 and 4.2 mol(-1)dm3 were determined by absorption and fluorescence spectral changes, respectively.
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