A5042877666- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Synthesis and Properties of Aromatic Compounds
- Organic Electronics and Photovoltaics
- Crystallography and molecular interactions
- Photosynthetic Processes and Mechanisms
- Surface Chemistry and Catalysis
- Molecular Junctions and Nanostructures
- Supramolecular Chemistry and Complexes
- Photochemistry and Electron Transfer Studies
- Metal-Catalyzed Oxygenation Mechanisms
- Photochromic and Fluorescence Chemistry
- Fullerene Chemistry and Applications
- Molecular Sensors and Ion Detection
- Magnetism in coordination complexes
- Conducting polymers and applications
- Perovskite Materials and Applications
- Graphene research and applications
- Organic and Molecular Conductors Research
- Photoreceptor and optogenetics research
- Nonlinear Optical Materials Studies
- Oxidative Organic Chemistry Reactions
- Supramolecular Self-Assembly in Materials
Nara Institute of Science and Technology
2016-2025
Japan Advanced Institute of Science and Technology
2015-2020
National Archives and Records Administration
2019
Kyoto University
2008-2018
Graduate School USA
2016-2018
Robert Bosch (Germany)
2016
Laboratoire de Chimie Moléculaire et Thioorganique
2016
Japan Science and Technology Agency
2004-2013
Yonsei University
2000-2013
Nagoya University
2010-2012
Crystalline solids with extended non-interpenetrating three-dimensional crystal structures were synthesized that support well-defined pores internal diameters of up to 48 angstroms. The Zn4O(CO2)6 unit was joined either one or two kinds organic link, 4,4',4''-[benzene-1,3,5-triyl-tris(ethyne-2,1-diyl)]tribenzoate (BTE), 4,4',44''-[benzene-1,3,5-triyl-tris(benzene-4,1-diyl)]tribenzoate (BBC), 4,4',44''-benzene-1,3,5-triyl-tribenzoate (BTB)/2,6-naphthalenedicarboxylate (NDC), and...
The importance of photosynthesis has driven researchers to seek ways mimic its fundamental features in simplified systems. absorption a photon by light-harvesting (antenna) complexes made up large number protein-embedded pigments initiates photosynthesis. Subsequently the many within antenna system shuttle that via an efficient excitation energy transfer (EET) until it encounters reaction center. Since 1995 discovery circularly arranged chromophoric assemblies crystal structure complex LH2...
Round the twist: Metalation of [36]octaphyrin 1 provided Möbius aromatic Pd2 complex 3 as well Hückel antiaromatic 2. This method can be applied to other expanded porphyrins and Group 10 metal ions. The aromatic/antiaromatic character was supported by NMR spectrscopy, NICS calculation, two-photon absorption measurements. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z704407_s.pdf or from author. Please note: publisher not...
Polycyclic aromatic hydrocarbons with an open-shell singlet biradical ground state are of fundamental interest and have potential applications in materials science. However, the inherent high reactivity makes their synthesis characterization very challenging. In this work, a convenient synthetic route was developed to synthesize two kinetically blocked heptazethrene (HZ-TIPS) octazethrene (OZ-TIPS) compounds good stability. Their ground-state electronic structures were systematically...
Monodisperse, rodlike molecules 1 composed of repeating individual chromophores that have substantial electronic interactions in the ground state been synthesized by meso – coupling porphyrins. The 128-mer (n=63) at about 106 nm long is longest such system known. S1 states are delocalized over 6 8 porphyrin units. Ar=3,5-dioctyloxyphenyl.
Oxidation of a directly meso-meso linked cyclic porphyrin tetramer 2 gave sheet 3. The symmetric square structure 3 is indicated by its simple 1H NMR spectrum that exhibits only two signals for the beta-protons. absorption displays characteristic Soret-like broad bands and weak Q-bands, magnetic circular dichroism (MCD) negative Faraday A term at 762 nm band as rare case, indicating transition from nondegenerate level to degenerate level. slightly longer S1-state (1.1 ps) smaller TPA cross...
The molecular design of directly meso-meso-linked porphyrin arrays as a new model light-harvesting antenna well photonic wire was envisaged to bring the units closer for rapid energy transfer. For this purpose, zinc(II) 5,15-bis(3,5-bis(octyloxy)phenyl)porphyrin (Z1) and its up Z128 (Zn, n represents number porphyrins) were synthesized. absorption spectra these change in systematic manner with an increase porphyrins; high-energy Soret bands remain at nearly same wavelength (413-414 nm),...
Recently, covalently linked or self-assembled porphyrin array systems have attracted much attention for their enhanced two-photon absorption (TPA) behaviors. In this study, we investigated the TPA properties of various dihedral angle controlled, directly dimers and arrays to elucidate relationship between π-conjugation pathway properties. We demonstrated a strong correlation (aromaticity) in assemblies.
A porphyrin nanobarrel, 1, that can encapsulate C(60) effectively was prepared via a concise coupling route. The structures of both 1 and C(60)@1 were confirmed by single-crystal X-ray diffraction analysis.
Verwickelt: Metallierung des [36]Octaphyrins 1 lieferte den Möbius-aromatischen Pd2-Komplex 3 sowie Hückel-antiaromatischen 2. Die Synthesemethode kann auf andere Porphyrine und Metallionen der Gruppe 10 übertragen werden. Der aromatische/antiaromatische Charakter wurde durch NMR-Spektroskopie, NICS-Rechnungen Zweiphotonenabsorptionsmessungen bestätigt. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2001/2008/z704407_s.pdf or from...
Increasing the length of N-heteroacenes or their analogues is highly desirable because such materials could have great potential applications in organic electronics. In this report, large π-conjugated N-heteroquinone 6,10,17,21-tetra-((triisopropylsilyl)ethynyl)-5,7,9,11,16,18,20,22-octaazanonacene-8,19-dione (OANQ) has been synthesized and characterized. The as-prepared OANQ shows high stability under ambient conditions a particularly low LUMO level, which leads to it being promising...
Open-shell singlet diradicaloids display unique electronic, nonlinear optical, and magnetic activity could become novel molecular materials for organic electronics, photonics, spintronics. However, design synthesis of with a significant polyradical character is challenging task chemists. In this Article, we report our efforts toward tetraradicaloid system. A series potential tetraradicaloids by fusion two p-quinodimethane (p-QDM) units naphthalene or benzene rings in different modes were...
Abstract A diradical approach to obtain stable organic dyes with intense absorption around λ =1100 nm is reported. The para ‐ and meta ‐quinodimethane‐bridged BODIPY dimers BD‐1 BD‐2 were synthesized found have a small amount of character. These molecules exhibited very at =1088 ( ɛ =6.65×10 5 M −1 cm ) 1136 =6.44×10 ), respectively, together large two‐photon‐absorption cross‐sections. Structural isomerization induced little variation in their character but distinctive differences physical...
Borrowing an idea from the silicon industry, where charge-carrier's characteristics can be changed through heteroatom implantation, we believe that charge transport nature of organic semiconductors switched molecular "doping" (co-crystallization). Here, report a novel molecule 2,7-di-tert-butyl-10,14-di(thiophen-2-yl)phenanthro[4,5-abc][1,2,5]thiadiazolo[3,4-i]phenazine (DTPTP), which originally is p-type (0.3 cm2 V-1 s-1) compound, and to n-type semiconductor (DTPTP2-TCNQ, 3 × 10-3 s-1...
Success in obtaining higher-order twistarenes with precise structures is very important for fundamentally understanding the relationship between and physical properties/optoelectronic applications. In this research, by using advantages from a retro-Diels-Alder process (clean reaction) cross-conjugated nature of pyrene unit, novel dodeca-twistarene was prepared first time. Its structure, confirmed single-crystal XRD analysis, indicates that it possesses twisted angle (≈30°), two neighboring...
The molecular structure, electrochemistry, spectroelectrochemistry and electrocatalytic oxygen reduction reaction (ORR) features of two CoII porphyrin(2.1.2.1) complexes bearing Ph or F5 groups at the meso-positions macrocycle are examined. Single crystal X-ray analysis reveal a highly bent, nonplanar macrocyclic conformation complex resulting in clamp-shaped structures. Cyclic voltammetry paired with UV/Vis PhCN/0.1 M TBAP suggest that first electron addition corresponds to...
Femtosecond fluorescence anisotropy measurements for a variety of cyclic porphyrin arrays such as Zn(II)porphyrin m-trimer and hexamer are reported along with o-dimer monomer reference molecules. In the arrays, pair moieties joined together via triphenyl linkage to ensure rigid structures. Anisotropy decay times can be well described by Förster incoherent excitation hopping process between units. Exciton coupling strengths 74 264 cm(-1) estimated from observed energy rates close those B800...
Directly meso-meso linked porphyrin rings CZ4, CZ6, and CZ8 that respectively comprise four, six, eight porphyrins have been synthesized in a stepwise manner from 5,10-diaryl zinc(II) building block. Symmetric cyclic structures indicated by their very simple (1)H NMR spectra exhibit only single set of absorption display characteristic broad nonsplit Soret band around 460 nm. Energy minimized calculated at the B3LYP/6-31G* level indicate dihedral angle between neighboring decreases order CZ6...
A series of meso-trifluoromethyl-substituted expanded porphyrins, including N-fused [24]pentaphyrin 3, [28]hexaphyrin 4, [32]heptaphyrin 5, [46]decaphyrin 6, and [56]dodecaphyrin 7, were synthesized by means an acid-catalyzed one-pot condensation reaction 2-(2,2,2-trifluoro-1-hydroxyethyl)pyrrole (1) as the first examples bearing meso-alkyl substituents. Besides these products, porphyrin 2 two calix[5]phyrins 8 9 also obtained. [28]Hexaphyrin 4 was quantitatively oxidized to [26]hexaphyrin...
Recent progress in the synthesis of covalently linked porphyrin arrays with large two-Photon absorption (TPA) cross-section values has been reviewed a particular focus on relation TPA properties molecular structures. Covalently continue to be important and useful for creation functional materials owing their chemical robustness, fine-tuning, easy manipulation. More importantly, electronic systems are quite susceptible periphery conjugative perturbations, hence allowing facile fabrications...
A dodecameric porphyrin wheel was prepared by Ag(I)-promoted intramolecular coupling of a linear dodecamer and observed scanning tunneling microscopy (STM). Efficient energy hopping along the array revealed femtosecond transient anisotropy measurements.