title: Coordination programming of photofunctional molecules.
abstract: Our recent achievements relating to photofunctional molecules are addressed. Section 1 discloses a new concept of photoisomerization. Pyridylpyrimidine-copper complexes undergo a ring inversion that can be modulated by the redox state of the copper center. In combination with an intermolecular photoelectron transfer (PET) initiated by the metal-to-ligand charge transfer (MLCT) transition of the Cu(I) state, we realize photonic regulation of the ring inversion. Section 2 reports on the first examples of heteroleptic bis(dipyrrinato)zinc(II) complexes. Conventional homoleptic bis(dipyrrinato)zinc(II) complexes suffered from low fluorescence quantum yields, whereas the heteroleptic ones feature bright fluorescence even in polar solvents. Section 3 describes our new findings on Pechmann dye, which was first synthesized in 1882. New synthetic procedures for Pechmann dye using dimethyl bis(arylethynyl)fumarate as a starting material gives rise to its new structural isomer. We also demonstrate potentiality of a donor-acceptor-donor type of Pechmann dye in organic electronics.
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. sakamoto@chem.s.u-tokyo.ac.jp
authors.forename: Ryota
authors.initials: R
authors.lastname: Sakamoto
authors.forename: Shinpei
authors.initials: S
authors.lastname: Kusaka
authors.forename: Mikihiro
authors.initials: M
authors.lastname: Hayashi
authors.forename: Michihiro
authors.initials: M
authors.lastname: Nishikawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nishihara
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004563:Electrochemistry; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D010777:Photochemistry; D011725:Pyridines / Q000737:chemistry; D011743:Pyrimidines / Q000737:chemistry; D011789:Quantum Theory; D015032:Zinc / Q000737:chemistry*
chemical_list: D008024:Ligands; D011725:Pyridines; D011743:Pyrimidines; D003300:Copper; D015032:Zinc; C030986:pyrimidine
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