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Bill, Nathan L.,Ishida, Masatoshi,Bä,hring, Steffen,Lim, Jong Min,Lee, Sangsu,Davis, Christina M.,Lynch, Vincent M.,Nielsen, Kent A.,Jeppesen, Jan O.,Ohkubo, Kei,Fukuzumi, Shunichi,Kim, Dongho,S American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.29
<P>A new class of redox-active free base and metalloporphyrins fused with the 1,3-dithiol-2-ylidene subunits present in tetrathiafulvalene, termed MTTFP (M = H<SUB>2</SUB>, Cu, Ni, Zn), have been prepared and characterized. The strong electron-donating properties of MTTFP were probed by electrochemical measurement and demonstrated that oxidation potentials can be tuned by metalation of the free base form, H<SUB>2</SUB>TTFP. X-ray crystal structures of H<SUB>2</SUB>TTFP, ZnTTFP, and CuTTFP revealed that a severe saddle-shape distortion was observed with the dithiole rings bent out of the plane toward one another in the neutral form. In contrast, the structure of the two-electron oxidized species (CuTFFP<SUP>2+</SUP>) is planar, corresponding to a change from a nonaromatic to aromatic structure upon oxidation. A relatively large two-photon absorption (TPA) cross-section value of H<SUB>2</SUB>TTFP<SUP>2+</SUP> (1200 GM) was obtained for the free base compound, a value that is much higher than those typically seen for porphyrins (<100 GM). Augmented TPA values for the metal complexes were also seen. The strong electron-donating ability of ZnTTFP was further enhanced by binding of Cl<SUP>–</SUP> and Br<SUP>–</SUP> as revealed by thermal electron-transfer between ZnTTFP and Li<SUP>+</SUP>-encapsulated C<SUB>60</SUB> (Li<SUP>+</SUP>@C<SUB>60</SUB>) in benzonitrile, which was “switched on” by the addition of either Cl<SUP>–</SUP> or Br<SUP>–</SUP> (as the tetrabutylammonium salts). The X-ray crystal structure of Cl<SUP>–</SUP>-bound ZnTTFP was determined and provided support for the strong binding between the Cl<SUP>–</SUP> anion and the Zn<SUP>2+</SUP> cation present in ZnTTFP.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-29/ja404830y/production/images/medium/ja-2013-04830y_0015.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja404830y'>ACS Electronic Supporting Info</A></P>
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