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Free base phthalocyanine: Influence of thermal effects and dimerization on the electronic absorption spectrum. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.01.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Zarei SA, Akhtari K, Hassanzadeh K, Piltan M, Saaidpour S, Abedi M. Halide (Cl-, Br-, I-) Influence on the Electronic Properties of Macrocyclic Nickel(II) Complexes: Ab-initio DFT Study. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2013. [DOI: 10.5012/jkcs.2013.57.3.311] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Fukuzumi S, Honda T, Kojima T. Structures and photoinduced electron transfer of protonated complexes of porphyrins and metallophthalocyanines. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.01.011] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Nishida KR, Wiggins BC, Hipps K, Mazur U. Aggregation of sulfonated free-base phthalocyanine on gold as a function of solution pH. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424611003392] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Aggregates of tetrakis(4-sulfonatophenyl)phthalocyanine were deposited on Au(111) from solutions of varying pH. The resulting surface species were studied by scanning tunneling microscopy (STM) under ambient and ultra high vacuum conditions. The pH of the solution from which the TSPc is deposited has profound effects on the adsorbed structures. We observed a diversity of surface structures. At low pH web like aggregates composed of vertically stacked coherent columnar assemblies averaging five molecules per stack were observed. Basic solutions yielded dense molecular monolayers.
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Affiliation(s)
- Krista R.A. Nishida
- Department of Chemistry and Materials Science and Engineering Program, Washington State University, PO Box 644630, Pullman, WA 99164-4630, USA
| | - Bryan C. Wiggins
- Department of Chemistry and Materials Science and Engineering Program, Washington State University, PO Box 644630, Pullman, WA 99164-4630, USA
| | - K.W. Hipps
- Department of Chemistry and Materials Science and Engineering Program, Washington State University, PO Box 644630, Pullman, WA 99164-4630, USA
| | - Ursula Mazur
- Department of Chemistry and Materials Science and Engineering Program, Washington State University, PO Box 644630, Pullman, WA 99164-4630, USA
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Novakova V, Mørkved EH, Miletin M, Zimcik P. Influence of protonation of peripheral substituents on photophysical and photochemical properties of tetrapyrazinoporphyrazines. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424610002458] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Octasubstituted zinc tetrapyrazinoporphyrazines with four N,N-dimethylaminophenyls and four phenyl or pyridin-3-yl substituents were synthesized and fully characterized. Their fluorescence quantum yields in DMF or pyridine were very low, almost undetectable, as a consequence of ultrafast intramolecular charge transfer. Titration of their DMF solutions with sulfuric acid led to increase of the fluorescence quantum yields by two orders of magnitude when the full protonation of peripheral substituents was achieved. Intramolecular charge transfer is no longer a favorable way of excited-state relaxation at full protonation of N,N-dimethylaminophenyl substituents because of loss of donor centers (free electron pair on its nitrogen). Similarly, singlet oxygen quantum yields also increased by two orders of magnitude when sulfuric acid was added to tetrapyrazinoporphyrazine solutions in DMF. Protonation at azomethine nitrogens of tetrapyrazinoporphyrazine macrocycle was observed at higher acid concentrations and it led to considerable decrease of fluorescence quantum yields. Octaphenyl zinc tetrapyrazinoporphyrazine and octa(pyridin-3-yl) zinc tetrapyrazinoporphyrazine were used as controls without intramolecular charge transfer. Their fluorescence and singlet oxygen quantum yields were high in DMF and decreased at higher concentrations of sulfuric acid due to protonation of azomethine nitrogens. The results suggest that the photophysical and photochemical properties of studied compounds may be controlled by changes of pH of medium.
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Affiliation(s)
- Veronika Novakova
- Department of Pharmaceutical Chemistry and Drug Control, Faculty of Pharmacy in Hradec Kralove, Charles University in Prague, Heyrovskeho 1203, 50005 Hradec Kralove, Czech Republic
| | - Eva H. Mørkved
- Norwegian University of Science and Technology, Department of Chemistry, N-7491 Trondheim, Norway
| | - Miroslav Miletin
- Department of Pharmaceutical Chemistry and Drug Control, Faculty of Pharmacy in Hradec Kralove, Charles University in Prague, Heyrovskeho 1203, 50005 Hradec Kralove, Czech Republic
| | - Petr Zimcik
- Department of Pharmaceutical Chemistry and Drug Control, Faculty of Pharmacy in Hradec Kralove, Charles University in Prague, Heyrovskeho 1203, 50005 Hradec Kralove, Czech Republic
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Honda T, Kojima T, Kobayashi N, Fukuzumi S. Crystal Structures and Electronic Properties of Saddle‐Distorted and Protonated Phthalocyanines. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006607] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tatsuhiko Honda
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2‐1 Yamada‐oka, Suita, Osaka 565‐0871 (Japan), Fax: (+81) 6879‐7370
| | - Takahiko Kojima
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1‐1‐1 Tennoudai, Tsukuba, Ibaraki 305‐8571 (Japan)
| | - Nagao Kobayashi
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980‐8578 (Japan)
| | - Shunichi Fukuzumi
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2‐1 Yamada‐oka, Suita, Osaka 565‐0871 (Japan), Fax: (+81) 6879‐7370
- Department of Bioinspired Science, Ewha Womans University, Seoul 120‐750 (Korea)
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Honda T, Kojima T, Kobayashi N, Fukuzumi S. Crystal structures and electronic properties of saddle-distorted and protonated phthalocyanines. Angew Chem Int Ed Engl 2011; 50:2725-8. [PMID: 21387475 DOI: 10.1002/anie.201006607] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tatsuhiko Honda
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Yamada-oka, Suita, Japan
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Lu TT, Gao HL, He TJ, Liu FC, Chen DM. Vibrational Spectra and Density Functional Theory Calculations of Metallo-tetra-(tert-butyl)-tetra-azaporphyrines. CHINESE J CHEM PHYS 2010. [DOI: 10.1088/1674-0068/23/05/573-581] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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