26
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Sung YM, Oh J, Kim W, Mori H, Osuka A, Kim D. Switching between Aromatic and Antiaromatic 1,3-Phenylene-Strapped [26]- and [28]Hexaphyrins upon Passage to the Singlet Excited State. J Am Chem Soc 2015; 137:11856-9. [PMID: 26340352 DOI: 10.1021/jacs.5b04047] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have demonstrated aromaticity reversal in the singlet excited states of internally 1,3-phenylene-strapped [26]- and [28]hexaphyrins (P26H and P28H). P26H displays a broad and reduced singlet-excited-state absorption spectrum, whereas P28H exhibits a sharp and intense singlet-excited-state absorption spectrum; both are in contrast to the ground-state absorption spectra, strongly indicating aromaticity reversal in the singlet excited state. Furthermore, magnetic and topological indices of aromaticity such as nucleus-independent chemical shift and harmonic oscillator model of aromaticity values for P26H and P28H also suggest that their singlet excited states become antiaromatic and aromatic, respectively.
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Huang W, Lee SK, Sung YM, Peng F, Yin B, Ma M, Chen B, Liu S, Kirk SR, Kim D, Song J. Azobenzene-Bridged Porphyrin Nanorings: Syntheses, Structures, and Photophysical Properties. Chemistry 2015; 21:15328-38. [DOI: 10.1002/chem.201502296] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Indexed: 01/28/2023]
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28
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Oh J, Yoon H, Sung YM, Kang P, Choi MG, Jang WD, Kim D. Modulation of Axial-Ligand Binding and Releasing Processes onto the Triazole-Bearing Nickel(II) Picket-Fence Porphyrins: Steric Repulsion versus Hydrogen-Bonding Effects. J Phys Chem B 2015; 119:7053-61. [DOI: 10.1021/acs.jpcb.5b03033] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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29
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Fimmel B, Son M, Sung YM, Grüne M, Engels B, Kim D, Würthner F. Phenylene Ethynylene-Tethered Perylene Bisimide Folda-Dimer and Folda-Trimer: Investigations on Folding Features in Ground and Excited States. Chemistry 2014; 21:615-30. [DOI: 10.1002/chem.201405231] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Indexed: 11/10/2022]
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30
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Yoneda T, Sung YM, Lim JM, Kim D, Osuka A. PdIIComplexes of [44]- and [46]Decaphyrins: The Largest Hückel Aromatic and Antiaromatic, and Möbius Aromatic Macrocycles. Angew Chem Int Ed Engl 2014; 53:13169-73. [DOI: 10.1002/anie.201408506] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Indexed: 11/12/2022]
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31
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Yoneda T, Sung YM, Lim JM, Kim D, Osuka A. PdIIComplexes of [44]- and [46]Decaphyrins: The Largest Hückel Aromatic and Antiaromatic, and Möbius Aromatic Macrocycles. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408506] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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32
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Davis CM, Lim JM, Larsen KR, Kim DS, Sung YM, Lyons DM, Lynch VM, Nielsen KA, Jeppesen JO, Kim D, Park JS, Sessler JL. Ion-Regulated Allosteric Binding of Fullerenes (C60 and C70) by Tetrathiafulvalene-Calix[4]pyrroles. J Am Chem Soc 2014; 136:10410-7. [DOI: 10.1021/ja504077f] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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33
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Ho IT, Zhang Z, Ishida M, Lynch VM, Cha WY, Sung YM, Kim D, Sessler JL. A Hybrid Macrocycle with a Pyridine Subunit Displays Aromatic Character upon Uranyl Cation Complexation. J Am Chem Soc 2014; 136:4281-6. [DOI: 10.1021/ja412520g] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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34
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Fukuoka T, Uchida K, Sung YM, Shin JY, Ishida S, Lim JM, Hiroto S, Furukawa K, Kim D, Iwamoto T, Shinokubo H. Near-IR Absorbing Nickel(II) Porphyrinoids Prepared by Regioselective Insertion of Silylenes into Antiaromatic Nickel(II) Norcorrole. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309921] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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35
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Fukuoka T, Uchida K, Sung YM, Shin JY, Ishida S, Lim JM, Hiroto S, Furukawa K, Kim D, Iwamoto T, Shinokubo H. Near-IR Absorbing Nickel(II) Porphyrinoids Prepared by Regioselective Insertion of Silylenes into Antiaromatic Nickel(II) Norcorrole. Angew Chem Int Ed Engl 2014; 53:1506-9. [DOI: 10.1002/anie.201309921] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Indexed: 11/06/2022]
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36
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Son M, Sung YM, Tokuji S, Fukui N, Yorimitsu H, Osuka A, Kim D. Control of the conformational dynamics of meso–meso vinylene-bridged Zn(ii) porphyrin dimers through diamine coordination. Chem Commun (Camb) 2014; 50:3078-80. [DOI: 10.1039/c4cc00126e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two meso–meso vinylene-bridged Zn(ii) porphyrin dimers 1 and 2 were analyzed in terms of the control of their conformational dynamics induced by the rotation around the double bond bridge.
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37
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Sung YM, Szyszko B, Myśliborski R, Stępień M, Oh J, Son M, Latos-Grażyński L, Kim D. The effect of π-conjugation in the macrocyclic ring on the photophysical properties of a series of thiaaceneporphyrinoids. Chem Commun (Camb) 2014; 50:8367-9. [DOI: 10.1039/c4cc03855j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In a series of thiaaceneporphyrinoids, their conformers exhibit macrocyclic π-conjugation pathways controlled by a dihedral angle between the porphyrin framework and acene planes.
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38
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Bill NL, Ishida M, Kawashima Y, Ohkubo K, Sung YM, Lynch VM, Lim JM, Kim D, Sessler JL, Fukuzumi S. Long-lived charge-separated states produced in supramolecular complexes between anionic and cationic porphyrins. Chem Sci 2014. [DOI: 10.1039/c4sc00803k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Photoinduced electron transfer in a porphyrin supramolecule occurs to produce an 83 ms CS state.
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39
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Lim JM, Ganesan K, Sung YM, Srinivasan A, Chandrashekar TK, Kim D. Photophysical properties of bridged core-modified hexaphyrins: conjugational perturbation of thiophene bridges. Chem Commun (Camb) 2014; 50:4358-60. [DOI: 10.1039/c4cc00309h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of thiophene bridges in determining the photophysical properties of bridged core-modified hexaphyrins is investigated.
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40
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Zeng W, Ishida M, Lee S, Sung YM, Zeng Z, Ni Y, Chi C, Kim D, Wu J. A
p
‐Quinodimethane‐Bridged Porphyrin Dimer. Chemistry 2013; 19:16814-24. [DOI: 10.1002/chem.201302023] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 08/02/2013] [Indexed: 11/06/2022]
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41
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Moon BH, Chaoumead A, Sung YM. Fundamental electrochemiluminescence characteristics of fluorine-doped tin oxides synthesized by sol-gel combustion. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2013; 13:7188-7190. [PMID: 24245225 DOI: 10.1166/jnn.2013.7912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Fluorine-doped tin oxide (FTO) materials synthesized by sol-gel combustion method were investigated for electrochemical luminescence (ECL) application. Effects of sol-gel combustion conditions on the structures and morphology of the porous FTO (p-FTO) materials were studied. ECL efficiency of p-FTO-based cell was about 251 cd/m2 at 4 V bias, which is higher than the sell using only FTO electrodes (102.8 cd/m2). The highest intensity of the emitting light was obtained at the wavelength of about 610 nm. The porous FTO layer was effective for increasing ECL intensities.
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42
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Saga S, Hayashi SY, Yoshida K, Tsurumaki E, Kim P, Sung YM, Sung J, Tanaka T, Kim D, Osuka A. Subporphyrins with an axial B-C bond. Chemistry 2013; 19:11158-61. [PMID: 23857881 DOI: 10.1002/chem.201302454] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Indexed: 11/09/2022]
Abstract
Axial fabrications of subporphyrins have been conveniently accomplished by the reaction of B(methoxo)triphenylsubporphyrin with Grignard reagents such as aryl-, heteroaryl-, ferrocenyl-, β-styryl-, phenylethynyl-, and ethylmagnesium bromides. The axial groups thus introduced are not conjugated with the subporphyrin core. This situation leads to effective fluorescence quenching of subporphyrins when the axial group is strongly electron donating such as 4-dimethylaminophenyl and ferrocenyl groups.
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43
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Sung YM. 1074Myocardial T1 and T2 Mappings with Automatic Motion
Correction at 3 Tesla MR: Comparison of T1 and T2 Measurements by Breathhold,
Free-Breathing and Cardiac Cycle. Eur Heart J Cardiovasc Imaging 2013. [DOI: 10.1093/ehjci/jet070bn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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44
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Sung YM. 1075Shortened Modified Look-Locker Inversion Recovery for
Myocardial T1 Mapping in Healthy Volunteers: Determination of Reference T1
Relaxation Times at 3 Tesla MR According to Different Contrast Injection
Methods. Eur Heart J Cardiovasc Imaging 2013. [DOI: 10.1093/ehjci/jet070l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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45
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Zeng Z, Ishida M, Zafra JL, Zhu X, Sung YM, Bao N, Webster RD, Lee BS, Li RW, Zeng W, Li Y, Chi C, López Navarrete JT, Ding J, Casado J, Kim D, Wu J. Pushing extended p-quinodimethanes to the limit: stable tetracyano-oligo(N-annulated perylene)quinodimethanes with tunable ground states. J Am Chem Soc 2013; 135:6363-71. [PMID: 23560651 DOI: 10.1021/ja402467y] [Citation(s) in RCA: 132] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
p-Quinodimethane (p-QDM) is a fundamental building block for the design of π-conjugated systems with low band gap and open-shell biradical character. However, synthesis of extended p-QDMs has usually suffered from their intrinsic high reactivity and poor solubility. In this work, benzannulation together with terminal cyano-substitution was demonstrated to be an efficient approach for the synthesis of a series of soluble and stable tetracyano-oligo(N-annulated perylene)quinodimethanes nPer-CN (n = 1-6), with the longest molecule having 12 para-linked benzenoid rings! The geometry and electronic structures of these oligomers were investigated by steady-state and transient absorption spectroscopy, nuclear magnetic resonance, electron spin resonance, superconducting quantum interference device, and FT Raman spectroscopy assisted by density functional theory calculations. They showed tunable ground states, varying from a closed-shell quinoidal structure for monomer, to a singlet biradical for dimer, trimer, and tetramer, and to a triplet biradical for pentamer and hexamer. Large two-photon absorption cross-section values were observed in the near-infrared range, which also exhibited a clear chain-length dependence.
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46
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Jana A, Ishida M, Cho K, Ghosh SK, Kwak K, Ohkubo K, Sung YM, Davis CM, Lynch VM, Lee D, Fukuzumi S, Kim D, Sessler JL. Tetrathiafulvalene-annulated [28]hexaphyrin(1.1.1.1.1.1): a multi-electron donor system subject to conformational control. Chem Commun (Camb) 2013; 49:8937-9. [DOI: 10.1039/c3cc44934c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Sung YM, Vasiliu M, Dixon DA, Bonizzoni M, Kim D, Vaid TP. Electronic structure and photophysics of (CC)tetra-p-tolylporphyrin2+. Photochem Photobiol Sci 2013; 12:1774-9. [DOI: 10.1039/c3pp50155h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Jana A, Ishida M, Kwak K, Sung YM, Kim DS, Lynch VM, Lee D, Kim D, Sessler JL. Comparative electrochemical and photophysical studies of tetrathiafulvalene-annulated porphyrins and their Zn(II) complexes: the effect of metalation and structural variation. Chemistry 2012. [PMID: 23180557 DOI: 10.1002/chem.201202727] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A series of tetrathiafulvalene (TTF)-annulated porphyrins, and their corresponding Zn(II) complexes, have been synthesized. Detailed electrochemical, photophysical, and theoretical studies reveal the effects of intramolecular charge-transfer transitions that originate from the TTF fragments to the macrocyclic core. The incremental synthetic addition of TTF moieties to the porphyrin core makes the species more susceptible to these charge-transfer (CT) effects as evidenced by spectroscopic studies. On the other hand, regular positive shifts in the reduction signals are seen in the square-wave voltammograms as the number of TTF subunits increases. Structural studies that involve the tetrakis-substituted TTF-porphyrin (both free-base and Zn(II) complex) reveal only modest deviations from planarity. The effect of TTF substitution is thus ascribed to electronic overlap between annulated TTF subunits rather than steric effects. The directly linked thiafulvalene subunits function as both π acceptors as well as σ donors. Whereas σ donation accounts for the substituent-dependent charge-transfer transitions, it is the π-acceptor nature of the appended tetrathiafulvalene groups that dominates the redox chemistry. Interactions between the subunits are also reflected in the square-wave voltammograms. In the case of the free-base derivatives that bear multiple TTF subunits, the neighboring TTF units, as well as the TTF(⋅+) generated through one-electron oxidation, can interact with each other; this gives rise to multiple signals in the square-wave voltammograms. On the other hand, after metalation, the electronic communication between the separate TTF moieties becomes restricted and they act as separate redox centers under conditions of oxidation. Thus only two signals, which correspond to TTF(⋅+) and TTF(2+), are observed. The reduction potentials are also seen to shift towards more negative values after metalation, a finding that is considered to reflect an increased HOMO-LUMO gap. To probe the excited-state dynamics and internal CT character, transient absorption spectral studies were performed. These analyses revealed that all the TTF-porphyrins of this study display relatively short excited-state lifetimes, which range from 1 to 20 ps. This reflects a very fast decay to the ground state and is consistent with the proposed intramolecular charge-transfer effects inferred from the ground-state studies. Complementary DFT calculations provide a mechanistic rationale for the electron flow within the TTF-porphyrins and support the proposed intramolecular charge-transfer interactions and π-acceptor effects.
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49
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Mori H, Sung YM, Lee BS, Kim D, Osuka A. Antiaromatic Hexaphyrins and Octaphyrins Stabilized by the Hydrogen-Bonding Interactions ofmeso-Imidazolyl Groups. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207212] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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50
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Mori H, Sung YM, Lee BS, Kim D, Osuka A. Antiaromatic Hexaphyrins and Octaphyrins Stabilized by the Hydrogen-Bonding Interactions ofmeso-Imidazolyl Groups. Angew Chem Int Ed Engl 2012; 51:12459-63. [DOI: 10.1002/anie.201207212] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Indexed: 01/13/2023]
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