title: Syntheses and CO2reduction activities of π-expanded/extended iron porphyrin complexes.
abstract: The construction of molecular catalysts that are active toward CO2reduction is of great significance for designing sustainable energy conversion systems. In this study, we aimed to develop catalysts for CO2reduction by introducing aromatic substituents to the meso-positions of iron porphyrin complexes. Three novel iron porphyrin complexes with π-expanded substituents (5,10,15,20-tetrakis(pyren-1-yl)porphyrinato iron(III) chloride (Fe-Py)), π-extended substituents (5,10,15,20-tetrakis((1,1'-biphenyl)-4-yl)porphyrinato iron(III) chloride (Fe-PPh)) and π-expanded and extended substituents (5,10,15,20-tetrakis(4-(pyren-1-yl)phenyl)porphyrinato iron(III) chloride (Fe-PPy)) were successfully synthesized, and their physical properties were investigated by UV-vis absorption spectroscopy and electrochemical measurements under Ar in comparison with an iron complex with a basic framework, 5,10,15,20-tetrakis(phenyl)porphyrinato iron(III) chloride (Fe-Ph). Moreover, the catalytic activity of the complexes was studied by electrochemical measurements under CO2, and it is found that the complex with the π-expanded substituents exhibits the highest activity among these complexes.
authors.affiliation: Institute for Molecular Science (IMS), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan.|Department of Structural Molecular Science, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama-cho, Kanagawa, 240-0193, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Okabe
authors.affiliation: Institute for Molecular Science (IMS), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan.|Department of Structural Molecular Science, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama-cho, Kanagawa, 240-0193, Japan.
authors.forename: Sze Koon
authors.initials: SK
authors.lastname: Lee
authors.affiliation: Institute for Molecular Science (IMS), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan. mio@ims.ac.jp.|Department of Structural Molecular Science, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama-cho, Kanagawa, 240-0193, Japan. mio@ims.ac.jp.|Japan Science and Technology Agency (JST), ACT-C, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan. mio@ims.ac.jp.|Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Nishigo-naka 38, Myodaiji, Okazaki, Aichi, 444-8585, Japan. mio@ims.ac.jp.
authors.forename: Mio
authors.initials: M
authors.lastname: Kondo
authors.affiliation: Institute for Molecular Science (IMS), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan. masaoka@ims.ac.jp.|Department of Structural Molecular Science, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama-cho, Kanagawa, 240-0193, Japan. masaoka@ims.ac.jp.|Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Nishigo-naka 38, Myodaiji, Okazaki, Aichi, 444-8585, Japan. masaoka@ims.ac.jp.
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Masaoka
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008665:Metalloporphyrins / Q000138:chemical synthesis* / Q000737:chemistry*; D015394:Molecular Structure; D010084:Oxidation-Reduction; D011166:Porphyrins / Q000737:chemistry*
chemical_list: D008665:Metalloporphyrins; D011166:Porphyrins; D002245:Carbon Dioxide; D007501:Iron
keywords: CO2 Reduction; Electrochemistry; Iron complex; Porphyrin; Pyrene