1
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Vázquez RJ, Yun JH, Muthike AK, Howell M, Kim H, Madu IK, Kim T, Zimmerman P, Lee JY, III TG. New Direct Approach for Determining the Reverse Intersystem Crossing Rate in Organic Thermally Activated Delayed Fluorescent (TADF) Emitters. J Am Chem Soc 2020; 142:8074-8079. [DOI: 10.1021/jacs.0c01225] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ricardo Javier Vázquez
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Ju Hui Yun
- School of Chemical and Engineering, Sunkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 446-740, Republic of Korea
| | - Angelar K. Muthike
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Madeleine Howell
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Hyungjun Kim
- Department of Chemistry, Incheon National University, Incheon 22012, Republic of Korea
| | - Ifeanyi K. Madu
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Taesu Kim
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Paul Zimmerman
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jun Yeob Lee
- School of Chemical and Engineering, Sunkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 446-740, Republic of Korea
| | - Theodore Goodson III
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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2
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Kournoutas F, Fihey A, Malval JP, Spangenberg A, Fecková M, le Poul P, Katan C, Robin-le Guen F, Bureš F, Achelle S, Fakis M. Branching effect on the linear and nonlinear optical properties of styrylpyrimidines. Phys Chem Chem Phys 2020; 22:4165-4176. [DOI: 10.1039/c9cp06476a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The branching effect on the photophysical properties of styrylpyrimidines is studied experimentally and theoretically.
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Affiliation(s)
| | - Arnaud Fihey
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F 35000 Rennes
- France
| | - Jean-Pierre Malval
- Institut de Science des Matériaux de Mulhouse CNRS-UMR 7361
- Université de Haute Alsace
- Mulhouse
- France
| | - Arnaud Spangenberg
- Institut de Science des Matériaux de Mulhouse CNRS-UMR 7361
- Université de Haute Alsace
- Mulhouse
- France
| | - Michaela Fecková
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F 35000 Rennes
- France
| | - Pascal le Poul
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F 35000 Rennes
- France
| | - Claudine Katan
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F 35000 Rennes
- France
| | - Françoise Robin-le Guen
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F 35000 Rennes
- France
| | - Filip Bureš
- Institute of Organic Chemistry and Technology
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice 53210
- Czech Republic
| | - Sylvain Achelle
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F 35000 Rennes
- France
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3
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Kournoutas F, Seintis K, Karakostas N, Tydlitát J, Achelle S, Pistolis G, Bureš F, Fakis M. Photophysical and Protonation Time Resolved Studies of Donor–Acceptor Branched Systems With Pyridine Acceptors. J Phys Chem A 2018; 123:417-428. [DOI: 10.1021/acs.jpca.8b08628] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Fotis Kournoutas
- Department of Physics, University of Patras, Greece, GR-26504 Patras, Greece
| | - Kostas Seintis
- Department of Physics, University of Patras, Greece, GR-26504 Patras, Greece
| | - Nikolaos Karakostas
- NCSR “Demokritos” Institute of Nanosciences and Nanotechnology (INN), 153 10 Athens, Greece
| | - Jiří Tydlitát
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Sylvain Achelle
- University of Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, F-35000 Rennes, France
| | - George Pistolis
- NCSR “Demokritos” Institute of Nanosciences and Nanotechnology (INN), 153 10 Athens, Greece
| | - Filip Bureš
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Mihalis Fakis
- Department of Physics, University of Patras, Greece, GR-26504 Patras, Greece
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4
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Peckus D, Matulaitis T, Franckevičius M, Mimaitė V, Tamulevičius T, Simokaitienė J, Volyniuk D, Gulbinas V, Tamulevičius S, Gražulevičius JV. Twisted Intramolecular Charge Transfer States in Trinary Star-Shaped Triphenylamine-Based Compounds. J Phys Chem A 2018. [DOI: 10.1021/acs.jpca.8b00981] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Domantas Peckus
- Institute of Materials Science, Kaunas University of Technology, K. Baršausko Str. 59, LT-51423 Kaunas, Lithuania
| | - Tomas Matulaitis
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilėnų Rd. 19, LT-50254 Kaunas, Lithuania
| | - Marius Franckevičius
- Center for Physical Sciences and Technology, Saulėtekio Ave. 3, LT-10257 Vilnius, Lithuania
| | - Viktorija Mimaitė
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilėnų Rd. 19, LT-50254 Kaunas, Lithuania
| | - Tomas Tamulevičius
- Institute of Materials Science, Kaunas University of Technology, K. Baršausko Str. 59, LT-51423 Kaunas, Lithuania
| | - Ju̅ratė Simokaitienė
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilėnų Rd. 19, LT-50254 Kaunas, Lithuania
| | - Dmytro Volyniuk
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilėnų Rd. 19, LT-50254 Kaunas, Lithuania
| | - Vidmantas Gulbinas
- Center for Physical Sciences and Technology, Saulėtekio Ave. 3, LT-10257 Vilnius, Lithuania
| | - Sigitas Tamulevičius
- Institute of Materials Science, Kaunas University of Technology, K. Baršausko Str. 59, LT-51423 Kaunas, Lithuania
| | - Juozas Vidas Gražulevičius
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilėnų Rd. 19, LT-50254 Kaunas, Lithuania
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5
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A two-photon fluorescent probe for biological Cu (Ⅱ) and PPi detection in aqueous solution and in vivo. Biosens Bioelectron 2017; 90:276-282. [DOI: 10.1016/j.bios.2016.11.069] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 11/17/2016] [Accepted: 11/29/2016] [Indexed: 01/09/2023]
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6
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Wang S, Xu S, Wang Y, Tian X, Zhang Y, Wang C, Wu J, Yang J, Tian Y. Synthesis, crystals of centrosymmetric triphenylamine chromophores bearing prodigious two-photon absorption cross-section and biological imaging. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:871-879. [PMID: 27816887 DOI: 10.1016/j.saa.2016.10.059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 10/07/2016] [Accepted: 10/28/2016] [Indexed: 06/06/2023]
Abstract
Two centrosymmetric D-π-D type triphenylamine chromophores with long π-conjugated bridge and strong electron-donating moiety were designed, synthesized and fully characterized. The crystal analysis revealed that multiple CH⋯π interactions existed in two chromophores, which played a crucial role in generating molecular 1D chains and 2D layers structures. Linear and nonlinear optical properties of the chromophores were systematically investigated with the aid of theoretical calculations. Two chromophores both exhibited intense and wide-dispersed one-photon/two-photon excited fluorescence, bear prodigious 2PA cross section (δ). Especially for Dye2, with ethyoxyl groups, displayed the strong 2PA activity, large cross-sections (δmax>16,000GM) and high NLO efficiency (δmax/MW>16GM/(g·mol)) in the range of 680-830nm in DMF. In addition, one- and two-photon fluorescence microscopy images of HepG2 cells incubated with Dye2 were obtained and found that Dye2 could effectively uptake toward living cells and display a uniformly localized in cytosolic space.
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Affiliation(s)
- Shichao Wang
- Department of Chemistry, Anhui University, Hefei 230601, PR China
| | - Shasha Xu
- Department of Chemistry, Anhui University, Hefei 230601, PR China
| | - Yiming Wang
- Department of Chemistry, Anhui University, Hefei 230601, PR China
| | - Xiaohe Tian
- Department of Chemistry, Anhui University, Hefei 230601, PR China
| | - Yujin Zhang
- Department of Physics and Electronics, Shandong Normal University, Jinan 250014, PR China
| | - Chuankui Wang
- Department of Physics and Electronics, Shandong Normal University, Jinan 250014, PR China
| | - Jieying Wu
- Department of Chemistry, Anhui University, Hefei 230601, PR China
| | - Jiaxiang Yang
- Department of Chemistry, Anhui University, Hefei 230601, PR China
| | - Yupeng Tian
- Department of Chemistry, Anhui University, Hefei 230601, PR China; State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, PR China.
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7
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He G, Yu C, Li Y, Hu J, Liu Z, Zhang D, Guo Q, Xia A. Excitation Energy Transfer inmeta-Substituted Phenylacetylene Multibranched Chromophores. Chem Asian J 2016; 11:2741-2748. [DOI: 10.1002/asia.201600326] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 04/06/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Guiying He
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Chenmin Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Laboratory of Organic Solid; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Yang Li
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Jiangpu Hu
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Zitong Liu
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Laboratory of Organic Solid; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
| | - Deqing Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Laboratory of Organic Solid; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
| | - Qianjin Guo
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
| | - Andong Xia
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
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8
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Zhang Q, Luo L, Xu H, Hu Z, Brommesson C, Wu J, Sun Z, Tian Y, Uvdal K. Design, synthesis, linear and nonlinear photophysical properties of novel pyrimidine-based imidazole derivatives. NEW J CHEM 2016. [DOI: 10.1039/c5nj02874d] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Novel pyrimidine imidazole derivatives with flexible ether chains have been synthesised and evaluated for their cell imaging performanceviaphotophysical investigations and theoretical calculations.
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Affiliation(s)
- Qiong Zhang
- Department of Chemistry
- Anhui University
- Hefei 230039
- P. R. China
- School of Physics and Material Science
| | - Lei Luo
- College of Pharmaceutical Science
- Southwest University
- China
| | - Hong Xu
- Department of Chemistry
- Anhui University
- Hefei 230039
- P. R. China
| | - Zhangjun Hu
- Division of Molecular Surface Physics & Nanoscience
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- 58183 Linköping
| | - Caroline Brommesson
- Division of Molecular Surface Physics & Nanoscience
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- 58183 Linköping
| | - Jieying Wu
- Department of Chemistry
- Anhui University
- Hefei 230039
- P. R. China
| | - Zhaoqi Sun
- School of Physics and Material Science
- Anhui University
- Hefei 230601
- P. R. China
| | - Yupeng Tian
- Department of Chemistry
- Anhui University
- Hefei 230039
- P. R. China
| | - Kajsa Uvdal
- Division of Molecular Surface Physics & Nanoscience
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- 58183 Linköping
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9
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Yu S, Wang S, Yu H, Feng Y, Zhang S, Zhu M, Yin H, Meng X. A ratiometric two-photon fluorescent probe for hydrazine and its applications. SENSORS AND ACTUATORS. B, CHEMICAL 2015; 220:1338-1345. [PMID: 26500394 PMCID: PMC4612371 DOI: 10.1016/j.snb.2015.07.051] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A ratiometric two-photon fluorescent probe TNQ was developed based on quinoline platform to detect hydrazine (N2H4) with high selectivity. TNQ exhibited large two-photon absorption cross sections at 710 nm (250 GM) and excellent ratiometric two-photon fluorescent detection signal for hydrazine. TNQ was also successfully applied to selectively detect hydrazine vapor even at a concentration down to 0.05%. Cell cytotoxicity and bio-imaging studies revealed that probe TNQ was cell-permeable and could be used to detect hydrazine in living cells with low cytotoxicity under two-photon excitation.
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Affiliation(s)
- Shenglong Yu
- Department of Chemistry, Anhui University, Hefei, 230601, China
- Center for Atomic Engineering of Advanced Material, Anhui University, Hefei, 230601, China
| | - Shuxin Wang
- Department of Chemistry, Anhui University, Hefei, 230601, China
- Center for Atomic Engineering of Advanced Material, Anhui University, Hefei, 230601, China
| | - Haizhu Yu
- Department of Chemistry, Anhui University, Hefei, 230601, China
- Center for Atomic Engineering of Advanced Material, Anhui University, Hefei, 230601, China
| | - Yan Feng
- Department of Chemistry, Anhui University, Hefei, 230601, China
- Center for Atomic Engineering of Advanced Material, Anhui University, Hefei, 230601, China
| | - Shuting Zhang
- Department of Chemistry and Biochemistry, BioFrontiers Institute, University of Colorado at Boulder, Boulder, CO 80309, USA
| | - Manzhou Zhu
- Department of Chemistry, Anhui University, Hefei, 230601, China
- Center for Atomic Engineering of Advanced Material, Anhui University, Hefei, 230601, China
| | - Hang Yin
- Department of Chemistry and Biochemistry, BioFrontiers Institute, University of Colorado at Boulder, Boulder, CO 80309, USA
| | - Xiangming Meng
- Department of Chemistry, Anhui University, Hefei, 230601, China
- Center for Atomic Engineering of Advanced Material, Anhui University, Hefei, 230601, China
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10
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Yin H, Zhang B, Yu H, Zhu L, Feng Y, Zhu M, Guo Q, Meng X. Two-Photon Fluorescent Probes for Biological Mg2+ Detection Based on 7-Substituted Coumarin. J Org Chem 2015; 80:4306-12. [DOI: 10.1021/jo502775t] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Haijing Yin
- Department
of Chemistry, Anhui University, Hefei, Anhui, China 230601
| | - Buchang Zhang
- Institute
of Health Sciences, Anhui University, Hefei, Anhui, China 230601
| | - Haizhu Yu
- Department
of Polymer Science and Technology, University of Science and Technology of Beijing, Beijing, China 100086
| | - Lin Zhu
- Institute
of Health Sciences, Anhui University, Hefei, Anhui, China 230601
| | - Yan Feng
- Department
of Chemistry, Anhui University, Hefei, Anhui, China 230601
| | - Manzhou Zhu
- Department
of Chemistry, Anhui University, Hefei, Anhui, China 230601
| | - Qingxiang Guo
- Department
of Chemistry, University of Science and Technology of China, Hefei, Anhui, China 230026
| | - Xiangming Meng
- Department
of Chemistry, Anhui University, Hefei, Anhui, China 230601
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11
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Yang J, Liu B, Wu J, Zhang S, Jin B, Tian Y. Sensitive ctDNA detection by a novel zinc(ii) complex with two-photon absorption based on electrochemiluminescence. NEW J CHEM 2015. [DOI: 10.1039/c4nj01727g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A novel zinc(ii) complex with an intramolecular ‘push–pull’ structure displays interesting two-photon absorption properties and its corresponding ECL sensor can detect ctDNA.
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Affiliation(s)
- Junsong Yang
- Department of Chemistry
- Anhui University
- Hefei 230039
- China
- Teaching and Research Office of Chemistry
| | - Bing Liu
- Department of Chemistry
- Anhui University
- Hefei 230039
- China
| | - Jieying Wu
- Department of Chemistry
- Anhui University
- Hefei 230039
- China
| | - Shengyi Zhang
- Department of Chemistry
- Anhui University
- Hefei 230039
- China
| | - Baokang Jin
- Department of Chemistry
- Anhui University
- Hefei 230039
- China
| | - Yupeng Tian
- Department of Chemistry
- Anhui University
- Hefei 230039
- China
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12
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Wang X, Wang X, Feng Y, Zhu M, Yin H, Guo Q, Meng X. A two-photon fluorescent probe for detecting endogenous hypochlorite in living cells. Dalton Trans 2015; 44:6613-9. [DOI: 10.1039/c5dt00012b] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A highly selective two-photon fluorescent probe (HQ) for endogenous hypochlorite (ClO−) was developed.
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Affiliation(s)
- Xunming Wang
- Department of Chemistry
- Anhui University
- Hefei
- China
- Department of Chemistry
| | - Xiaohui Wang
- Chemical Biology Laboratory
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Yan Feng
- Department of Chemistry
- Anhui University
- Hefei
- China
| | - Manzhou Zhu
- Department of Chemistry
- Anhui University
- Hefei
- China
| | - Hang Yin
- Department of Chemistry and Biochemistry and BioFrontiers Institute
- University of Colorado at Boulder
- Boulder
- USA
| | - QingXiang Guo
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- China
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13
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Design, synthesis, linear and nonlinear photophysical properties and biological imaging application of a novel Λ-type pyrimidine-based thiophene derivative. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.04.058] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Yang J, Tian Y, Zhang S, Wu J, Jin B. Two-photon absorption and sensitivity to DNA of dye molecule-driven CdSe quantum dots. RSC Adv 2014. [DOI: 10.1039/c4ra02070g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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15
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Nie C, Zhang Q, Ding H, Huang B, Wang X, Zhao X, Li S, Zhou H, Wu J, Tian Y. Two novel six-coordinated cadmium(ii) and zinc(ii) complexes from carbazate β-diketonate: crystal structures, enhanced two-photon absorption and biological imaging application. Dalton Trans 2014; 43:599-608. [DOI: 10.1039/c3dt51318a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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16
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Wu Q, Xiao Z, Du X, Song Q. A Novel Ratiometric Two‐Photon Fluorescent Probe for the Detection of Biothiols in Solution and Imaging of Living Cells. Chem Asian J 2013; 8:2564-8. [DOI: 10.1002/asia.201300491] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 05/03/2013] [Indexed: 12/21/2022]
Affiliation(s)
- Qing‐Qing Wu
- Department of Chemistry, Joint Laboratory of Green Synthetic Chemistry, University of Science and Technology of China (USTC), Hefei 230026 (P. R. China), Fax: (+86) 551‐3601592
| | - Zu‐Feng Xiao
- Department of Chemistry, Joint Laboratory of Green Synthetic Chemistry, University of Science and Technology of China (USTC), Hefei 230026 (P. R. China), Fax: (+86) 551‐3601592
| | - Xiao‐Jiao Du
- CAS Key Laboratory of Brain Function and Disease and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027 (P. R. China)
| | - Qin‐Hua Song
- Department of Chemistry, Joint Laboratory of Green Synthetic Chemistry, University of Science and Technology of China (USTC), Hefei 230026 (P. R. China), Fax: (+86) 551‐3601592
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17
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Magnetically controllable dual-mode nanoprobes for cell imaging with an onion-liked structure. Talanta 2013; 116:978-84. [PMID: 24148504 DOI: 10.1016/j.talanta.2013.08.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Revised: 08/04/2013] [Accepted: 08/11/2013] [Indexed: 11/20/2022]
Abstract
A magnetically controllable dual-mode optical probe is demonstrated for cellular imaging with an onion-liked structure, which can exhibit both surface enhanced Raman scattering (SERS) and fluorescence signals. For obtaining such a nanoprobe, Fe3O4 nanoparticles were first encapsulated into an inner layer of silica, which were then coated with a second layer of gold nanoshell (designated as Fe3O4@SiO2@Au). By adjusting the thickness of the gold shell, the surface plasmon resonance (SPR) of Fe3O4@SiO2@Au nanoparticles can be easily tuned from visible to near-infrared (NIR) region. Afterwards, the prepared Fe3O4@SiO2@Au nanoparticles were tagged with a third layer of Raman reporters to exhibit SERS signals and further coated with an outmost layer of dye-doped silica to generate fluorescence. When being excited at different wavelengths as 515nm and 633nm, the distinct fluorescence and SERS signals can be separately observed. More interestingly, an enhanced cellular uptake of the presented nanoprobes was observed in the presence of a magnetic field, which was proved by both fluorescence and SERS images. This onion-liked multi-modal nanoplatform has great potential in bio-imaging, targeted delivery applications and biological separations.
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18
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Abstract
In the past 20 years, researchers studying nanomaterials have uncovered many new and interesting properties not found in bulk materials. Extensive research has focused on metal nanoparticles (>3 nm) because of their potential applications, such as in molecular electronics, image markers, and catalysts. In particular, the discovery of metal nanoclusters (<3 nm) has greatly expanded the horizon of nanomaterial research. These nanosystems exhibit molecular-like characteristics as their size approaches the Fermi-wavelength of an electron. The relationships between size and physical properties for nanomaterials are intriguing, because for metal nanosystems in this size regime both size and shape determine electronic properties. Remarkably, changes in the optical properties of nanomaterials have provided tremendous insight into the electronic structure of nanoclusters. The success of synthesizing monolayer protected clusters (MPCs) in the condensed phase has allowed scientists to probe the metal core directly. Au MPCs have become the "gold" standard in nanocluster science, thanks to the rigorous structural characterization already accomplished. The use of ultrafast laser spectroscopy on MPCs in solution provides the benefit of directly studying the chemical dynamics of metal nanoclusters (core), and their nonlinear optical properties. In this Account, we investigate the optical properties of MPCs in the visible region using ultrafast spectroscopy. Based on fluorescence up-conversion spectroscopy, we propose an emission mechanism for these nanoclusters. These clusters behave differently from nanoparticles in terms of emission lifetimes as well as two-photon cross sections. Through further investigation of the transient (excited state) absorption, we have found many unique phenomena of nanoclusters, such as quantum confinement effects and vibrational breathing modes. In summary, based on the differences in the optical properties, the distinction between nanoclusters and nanoparticles appears at a size near 2.2 nm. This is consistent with simulations from a free-electron model proposed for MPCs. The use of ultrafast techniques on these nanoclusters can answer many of the fundamental questions about the nature of these exciting nanomaterials and their applications.
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Affiliation(s)
- Sung Hei Yau
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, United States
| | - Oleg Varnavski
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, United States
| | - Theodore Goodson
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, United States
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19
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Xu D, Yang M, Wang Y, Cao Y, Fang M, Zhu W, Zhou H, Hao F, Wu J, Tian Y. New dyes with enhanced two-photon absorption cross-sections based on the Cd(II) and 4′-(4-[4-(imidazole)styryl]phenyl)-2,2′ : 6′,2″-terpyridine. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.819493] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Dongling Xu
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
| | - Mingdi Yang
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
| | - Yang Wang
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
| | - Yuanle Cao
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
| | - Min Fang
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
| | - Weiju Zhu
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
| | - Hongping Zhou
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
| | - Fuying Hao
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
- d Department of Chemistry , Fuyang Normal College , Fuyang , China
| | - Jieying Wu
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
| | - Yupeng Tian
- a Department of Chemistry , Anhui University and Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province , Hefei , China
- b State Key Laboratory of Crystal Materials , Shandong University , Jinan , China
- c State Key Laboratory of Coordination Chemistry , Nanjing University , Nanjing , China
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20
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Robin MP, Mabire AB, Damborsky JC, Thom ES, Winzer-Serhan UH, Raymond JE, O’Reilly RK. New Functional Handle for Use as a Self-Reporting Contrast and Delivery Agent in Nanomedicine. J Am Chem Soc 2013; 135:9518-24. [DOI: 10.1021/ja403587c] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Mathew P. Robin
- Department of Chemistry, University of Warwick, Library Road, Coventry CV4 7AL,
United Kingdom
| | - Anne B. Mabire
- Department of Chemistry, University of Warwick, Library Road, Coventry CV4 7AL,
United Kingdom
| | - Joanne C. Damborsky
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Health Sciences Center, Texas A&M University System, Bryan, Texas 77807, United States
| | - Elizabeth S. Thom
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Health Sciences Center, Texas A&M University System, Bryan, Texas 77807, United States
| | - Ursula H. Winzer-Serhan
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Health Sciences Center, Texas A&M University System, Bryan, Texas 77807, United States
| | | | - Rachel K. O’Reilly
- Department of Chemistry, University of Warwick, Library Road, Coventry CV4 7AL,
United Kingdom
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21
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Synthesis, photophysical properties and TD-DFT calculation of four two-photon absorbing triphenylamine derivatives. Sci China Chem 2012. [DOI: 10.1007/s11426-012-4794-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Montgomery NA, Hedley GJ, Ruseckas A, Denis JC, Schumacher S, Kanibolotsky AL, Skabara PJ, Galbraith I, Turnbull GA, Samuel IDW. Dynamics of fluorescence depolarisation in star-shaped oligofluorene-truxene molecules. Phys Chem Chem Phys 2012; 14:9176-84. [PMID: 22641238 DOI: 10.1039/c2cp24141b] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Star-shaped molecules are of growing interest as organic optoelectronic materials. Here a detailed study of their photophysics using fluorescence depolarisation is reported. Fluorescence depolarisation dynamics are studied in branched oligofluorene-truxene molecules with a truxene core and well-defined three-fold symmetry, and are compared with linear fluorene oligomers. An initial anisotropy value of 0.4 is observed which shows a two-exponential decay with time constants of 500 fs and 3-8 ps in addition to a long-lived component. The femtosecond component is attributed to exciton localisation on one branch of the molecule and its amplitude reduces when the excitation is tuned to the low energy tail of the absorption spectrum. The picosecond component shows a weak dependence on the excitation wavelength and is similar to the calculated rate of the resonant energy transfer of the localised exciton between the branches. These assignments are supported by density-functional theory calculations which show a disorder-induced splitting of the two degenerate excited states. Exciton localisation is much slower than previously reported in other branched molecules which suggests that efficient light-harvesting systems can be designed using oligofluorenes and truxenes as building blocks.
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Affiliation(s)
- Neil A Montgomery
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom
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23
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Li Y, Chong H, Meng X, Wang S, Zhu M, Guo Q. A novel quinoline-based two-photon fluorescent probe for detecting Cd2+ in vitro and in vivo. Dalton Trans 2012; 41:6189-94. [PMID: 22499396 DOI: 10.1039/c2dt30192j] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A new two-photon fluorescent Cd(2+) probe APQ is developed by introducing a N(1),N(1)-dimethyl-N(2)-(pyridin-2-ylmethyl)ethane-1,2-diamine binding group and a 4-methoxyphenylvinyl conjugation-enhancing group to the 2- and 6-positions of quinoline. This probe shows a large red shift and good emission enhancement under Cd(2+) binding. It also exhibits a high ion selectivity for Cd(2+) (especially over Zn(2+)) and a large two-photon absorption cross section at 710 nm. Two-photon microscopy imaging studies reveal that the new probe is non-toxic and cell-permeable and can be used to detect intracellular Cd(2+) under two-photon excitation.
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Affiliation(s)
- Yiming Li
- Department of Chemistry, Anhui University, Hefei 230039, P. R. China
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24
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Zhou FX, Zheng Z, Zhou HP, Ke WZ, Wang JQ, Yu ZP, Jin F, Yang JX, Wu JY, Tian YP. A new 2,2′:6′,2′′-terpyridine-based ligand and its complexes: structures, photophysical properties and DFT calculations to evaluate the halogen effect on the TPA. CrystEngComm 2012. [DOI: 10.1039/c2ce25467k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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25
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Donehue JE, Varnavski OP, Cemborski R, Iyoda M, Goodson T. Probing Coherence in Synthetic Cyclic Light-Harvesting Pigments. J Am Chem Soc 2011; 133:4819-28. [DOI: 10.1021/ja108359w] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jessica E. Donehue
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Oleg P. Varnavski
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Robert Cemborski
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Masahiko Iyoda
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Theodore Goodson
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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26
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Badaeva E, Harpham MR, Guda R, Süzer Ö, Ma CQ, Bäuerle P, Goodson T, Tretiak S. Excited-State Structure of Oligothiophene Dendrimers: Computational and Experimental Study. J Phys Chem B 2010; 114:15808-17. [DOI: 10.1021/jp109624d] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ekaterina Badaeva
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States, Department of Chemistry, Applied Physics Program, The University of Michigan, Ann Arbor Michigan 48109, United States, Institute of Organic Chemistry II and Advanced Materials, University of Ulm, 89081, Ulm, Germany, and Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Michael R. Harpham
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States, Department of Chemistry, Applied Physics Program, The University of Michigan, Ann Arbor Michigan 48109, United States, Institute of Organic Chemistry II and Advanced Materials, University of Ulm, 89081, Ulm, Germany, and Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Ramakrishna Guda
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States, Department of Chemistry, Applied Physics Program, The University of Michigan, Ann Arbor Michigan 48109, United States, Institute of Organic Chemistry II and Advanced Materials, University of Ulm, 89081, Ulm, Germany, and Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Özgün Süzer
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States, Department of Chemistry, Applied Physics Program, The University of Michigan, Ann Arbor Michigan 48109, United States, Institute of Organic Chemistry II and Advanced Materials, University of Ulm, 89081, Ulm, Germany, and Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Chang-Qi Ma
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States, Department of Chemistry, Applied Physics Program, The University of Michigan, Ann Arbor Michigan 48109, United States, Institute of Organic Chemistry II and Advanced Materials, University of Ulm, 89081, Ulm, Germany, and Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Peter Bäuerle
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States, Department of Chemistry, Applied Physics Program, The University of Michigan, Ann Arbor Michigan 48109, United States, Institute of Organic Chemistry II and Advanced Materials, University of Ulm, 89081, Ulm, Germany, and Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Theodore Goodson
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States, Department of Chemistry, Applied Physics Program, The University of Michigan, Ann Arbor Michigan 48109, United States, Institute of Organic Chemistry II and Advanced Materials, University of Ulm, 89081, Ulm, Germany, and Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Sergei Tretiak
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States, Department of Chemistry, Applied Physics Program, The University of Michigan, Ann Arbor Michigan 48109, United States, Institute of Organic Chemistry II and Advanced Materials, University of Ulm, 89081, Ulm, Germany, and Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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27
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Wong CY, Scholes GD. Biexcitonic Fine Structure of CdSe Nanocrystals Probed by Polarization-Dependent Two-Dimensional Photon Echo Spectroscopy. J Phys Chem A 2010; 115:3797-806. [DOI: 10.1021/jp1079197] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Cathy Y. Wong
- Department of Chemistry, 80 St. George Street, Institute for Optical Sciences, and Centre for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario, M5S 3H6 Canada
| | - Gregory D. Scholes
- Department of Chemistry, 80 St. George Street, Institute for Optical Sciences, and Centre for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario, M5S 3H6 Canada
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28
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Oh MHJ, Salvador MR, Wong CY, Scholes GD. Three-Pulse Photon-Echo Peak Shift Spectroscopy and Its Application for the Study of Solvation and Nanoscale Excitons. Chemphyschem 2010; 12:88-100. [DOI: 10.1002/cphc.201000712] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Indexed: 11/10/2022]
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29
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Varnavski O, Ramakrishna G, Kim J, Lee D, Goodson T. Optically excited acoustic vibrations in quantum-sized monolayer-protected gold clusters. ACS NANO 2010; 4:3406-3412. [PMID: 20509617 DOI: 10.1021/nn1003524] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report a systematic investigation of the optically excited vibrations in monolayer-protected gold clusters capped with hexane thiolate as a function of the particle size in the range of 1.1-4 nm. The vibrations were excited and monitored in transient absorption experiments involving 50 fs light pulses. For small quantum-sized clusters (< or =2.2 nm), the frequency of these vibrations has been found to be independent of cluster size, while for larger clusters (3 and 4 nm), we did not observe detectable optically excited vibrations in this regime. Possible mechanisms of excitation and detection of the vibrations in nanoclusters in the course of the transient absorption are discussed. The results of the current investigation support a displacive excitation mechanism associated with the presence of finite optical energy gap in the quantum-sized nanoclusters. Observed vibrations provide a new valuable diagnostic tool for the investigations of quantum size effects and structural studies in metal nanoclusters.
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Affiliation(s)
- Oleg Varnavski
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
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30
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Mechanism of Förster-type hopping of charge transfer and excitation energy transfer along blocked oligothiophenes by Si-atoms. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.02.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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He GS, Tan LS, Zheng Q, Prasad PN. Multiphoton Absorbing Materials: Molecular Designs, Characterizations, and Applications. Chem Rev 2008; 108:1245-330. [PMID: 18361528 DOI: 10.1021/cr050054x] [Citation(s) in RCA: 1205] [Impact Index Per Article: 75.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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32
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Megerle U, Selmaier F, Lambert C, Riedle E, Lochbrunner S. Symmetry-dependent solvation of donor-substituted triarylboranes. Phys Chem Chem Phys 2008; 10:6245-51. [DOI: 10.1039/b806131a] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Ramakrishna G, Bhaskar A, Bauerle P, Goodson T. Oligothiophene Dendrimers as New Building Blocks for Optical Applications. J Phys Chem A 2007; 112:2018-26. [DOI: 10.1021/jp076048h] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guda Ramakrishna
- Department of Chemistry and Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, and Department of Organic Chemistry II, Ulm University, 89081 Ulm, Germany
| | - Ajit Bhaskar
- Department of Chemistry and Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, and Department of Organic Chemistry II, Ulm University, 89081 Ulm, Germany
| | - Peter Bauerle
- Department of Chemistry and Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, and Department of Organic Chemistry II, Ulm University, 89081 Ulm, Germany
| | - Theodore Goodson
- Department of Chemistry and Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, and Department of Organic Chemistry II, Ulm University, 89081 Ulm, Germany
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34
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Brown OJ, Lopez SA, Fuller AO, Goodson T. Formation and reversible dissociation of coiled coil of peptide to the C-terminus of the HSV B5 protein: a time-resolved spectroscopic analysis. Biophys J 2007; 93:1068-78. [PMID: 17496024 PMCID: PMC1913165 DOI: 10.1529/biophysj.106.100958] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2006] [Accepted: 04/09/2007] [Indexed: 11/18/2022] Open
Abstract
An understanding of the molecular mechanisms of the newly characterized herpes simplex virus (HSV) B5 protein is important to further elucidate the HSV cell entry and infection. The synthetic peptide of B5 (wtB5) was functionalized with the nonlinear optical chromophore cascade yellow and its molecular dynamics was probed at physiological and endosomal pH (pH 7.4 and 5.5, respectively). Steady-state CD spectroscopy was utilized to characterize the peptides at different pH. These spectra showed structural changes in the peptide with time measured over several days. Nonlinear optical measurements were carried out to probe the interactions and local environment of the labeled peptide, and the increase in the two-photon cross section of this system suggests an increase in chromophore-peptide interactions. Time-resolved fluorescence upconversion measurements reflected changes in the hydrophilic and hydrophobic local environments of the labeled peptide-chromophore system. Ultrafast depolarization measurements gave rotational correlation times indicative of a reversible change in the size of the peptide. The time-resolved results provide compelling evidence of a reversible dissociation of the coiled coils of the wtB5 peptide. This process was found to be pH-insensitive. The data from this unique combination of techniques provide an initial step to understanding the molecular dynamics of B5 and a framework for the development of novel imaging methods based on two-photon emission, as well as new therapeutics for HSV.
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Affiliation(s)
- Ordel J Brown
- Department of Chemistry, University of Michigan, USA
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35
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Yan Y, Li B, Liu K, Dong Z, Wang X, Qian S. Enhanced Two-Photon Absorption and Ultrafast Dynamics of a New Multibranched Chromophore with a Dibenzothiophene Core. J Phys Chem A 2007; 111:4188-94. [PMID: 17474724 DOI: 10.1021/jp067783g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of novel compounds with dibenzothiophene core branched structures have been synthesized, and their two-photon absorption (TPA) properties were investigated. Two-photon fluorescence (TPF) and z-scan techniques were carried out, and a significant enhancement in the TPA cross section was observed for ST-G2, which possesses the largest generation number among the studied samples. By using different solvents, the largest nonlinear optical (NLO) response was observed in the most polar solvent. Ultrafast pump-probe experiments were performed to probe the excited state dynamics in the branched molecules, and the obtained results further confirmed the TPA enhancement mechanism. Time-resolved fluorescence (TRFL) and TRFL anisotropy measurements reveal that there is an ultrafast charge localization to the intramolecular charge transfer (ICT) state followed by relaxation with a lifetime longer than 1 ns.
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Affiliation(s)
- Yongli Yan
- Physics Department, Fudan University, Shanghai 200433, People's Republic of China, Surface Physics Lab (National Key Lab), Fudan University, Shanghai 200433, People's Republic of China
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36
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Ramakrishna G, Goodson T. Excited-State Deactivation of Branched Two-Photon Absorbing Chromophores: A Femtosecond Transient Absorption Investigation. J Phys Chem A 2007; 111:993-1000. [PMID: 17249643 DOI: 10.1021/jp064004n] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Branched macromolecular structures are now an important area of research for enhanced two-photon absorption (TPA) cross sections. The mechanism of this enhancement has been suggested as a complex interplay between intramolecular interactions and the extent of charge-transfer character in the branches. In order to probe these processes more clearly, excited-state dynamics of multibranched chromophores by means of femtosecond transient absorption spectroscopy are reported. Investigations have been carried out on the PRL dye series (PRL-101, PRL-501, PRL-701), which have shown cooperative enhancement of the TPA cross section. Upon photoexcitation, transient absorption measurements have shown the presence of a localized charge-transfer (intramolecular charge transfer, ICT) state independent of branching. The results point to ultrafast localization of charge in this particular system of chromophores. Pump-probe measurements in highly polar solvents have shown the presence of a nonemissive charge-transfer state which is a solvent stabilized and conformationally relaxed state. The population of this nonemissive state increases from monomer to trimer, and thus, it has been used as indicator of the polar nature of the Franck-Condon state. These results have shown an increase of charge-transfer character of the excited state with an increase in branching, and this explains the relative increase in the two-photon cross section of the PRL series.
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Affiliation(s)
- Guda Ramakrishna
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
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37
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Tian YP, Li L, Zhang JZ, Yang JX, Zhou HP, Wu JY, Sun PP, Tao LM, Guo YH, Wang CK, Xing H, Huang WH, Tao XT, Jiang MH. Investigations and facile synthesis of a series of novel multi-functional two-photon absorption materials. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b703853d] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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38
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Ramakrishna G, Bhaskar A, Goodson T. Ultrafast Excited State Relaxation Dynamics of Branched Donor-π-Acceptor Chromophore: Evidence of a Charge-Delocalized State. J Phys Chem B 2006; 110:20872-8. [PMID: 17048901 DOI: 10.1021/jp063262h] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Excited-state dynamics and complete transient absorption features of the trimer tris-4,4',4' '-(4-nitrophenyleethynyl)triphenylamine and the monomer 4-N,N-(dimethylamino)-4'-nitrotolane have been obtained from femtosecond pump-probe spectroscopy. The measurements are carried out to understand the mechanism behind enhanced two-photon absorption cross-sections of branched systems over their linear counterparts. Absorption and emission transition dipole moments of monomer and trimer in toluene have suggested that the emitting state of trimer is different from the monomer and probably is arising from the charge-delocalized C(3) symmetry state. Ultrafast transient absorption measurements on these molecules have spectroscopically validated the presence of an initial electron delocalized state with the C(3) symmetry state in the trimer molecule. The results have shown that there is a slower rate of internal conversion from the C(3) symmetry state to intramolecular charge transfer of trimer suggesting a barrier between them. Also, presence of a charge-stabilized state and involvement of a nonemissive state in the excited-state deactivation has been observed for both monomer and trimer.
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Affiliation(s)
- Guda Ramakrishna
- Department of Chemistry, University of Michigan, Ann Arbor, 48109, USA
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Bhaskar A, Ramakrishna G, Lu Z, Twieg R, Hales JM, Hagan DJ, Van Stryland E, Goodson T. Investigation of Two-Photon Absorption Properties in Branched Alkene and Alkyne Chromophores. J Am Chem Soc 2006; 128:11840-9. [PMID: 16953624 DOI: 10.1021/ja060630m] [Citation(s) in RCA: 217] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Novel alkene and alkyne branched structures have been synthesized, and their two-photon absorption (2PA) properties are reported. This series of alkene and alkyne trimer systems tests the mechanistic approach for enhancing the 2PA process which is usually dictated by the pi-bridging, delocalization length, and corresponding charge transfer on the 2PA cross sections. The results suggest that alkene branched systems have higher 2PA cross sections. While steady-state absorption and emission measurements were not successful in predicting the observed trend of 2PA cross sections, time-resolved measurements have explained the trends observed. It was found that, upon photoexcitation, there is an ultrafast charge localization to an intramolecular charge-transfer (ICT) state, followed by the presence of a solvent and conformationally relaxed ICT state in these branched systems.
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Affiliation(s)
- Ajit Bhaskar
- Department of Chemistry and Macromolecular Science, University of Michigan, Ann Arbor, Michigan 48109, USA
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40
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Fujitsuka M, Cho DW, Ohshita J, Kunai A, Majima T. Singlet Energy Migration along an Alternating Block Copolymer of Oligothiophene and Oligosilylene in Solution. J Phys Chem B 2006; 110:12446-50. [PMID: 16800571 DOI: 10.1021/jp054819g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The singlet excited-state properties of the block copolymers of oligothiophene and oligosilylene in solution were investigated with several fast spectroscopic methods. Time-resolved fluorescence measurements at room temperature and in a glassy matrix revealed that the singlet excited states of the block copolymers are deactivated accompanying structural changes of the polymer. It became clear from the transient absorption spectroscopy that the absorption peak of the singlet excited state shifted to the longer wavelength side compared to that of the corresponding oligothiophenes because of the sigma-pi conjugation of the oligothiophene and oligosilylene. The intersystem crossing process generating the triplet excited state was also revealed by the transient absorption spectroscopy. Energy migration along the polymer chain was revealed by the fluorescence anisotropy measurements. The time constant for the energy migration became faster as the size of the oligothiophene in the polymer repeating unit became shorter. From comparison with the Förster theory, the energy migration process was attributed to an incoherent hopping mechanism.
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Affiliation(s)
- Mamoru Fujitsuka
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
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Anand S, Varnavski O, Marsden JA, Haley MM, Schlegel HB, Goodson T. Optical Excitations in Carbon Architectures Based on Dodecadehydrotribenzo[18]annulene. J Phys Chem A 2005; 110:1305-18. [PMID: 16435791 DOI: 10.1021/jp0539573] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The origin of excitations in multi-chromophore carbon network substructures based on dodecadehydrotribenzo[18]annulene has been investigated by steady-state and photon echo spectroscopy, configuration interaction (CIS and CIS(D)), and time-dependent density functional theory (TD-DFT). 1,4-diphenylbutadiyne, the simplest structural subunit within the annulene, was used in modeling the spectroscopic studies to explain the origin of excitations in the macrocycles. The optical excitations in longer linear systems were found to be similar to its diphenylacetylene analogue. However, the results from dodecadehydrotribenzo[18]annulene and other multichromophore networks systems illustrate the possibility of strong intramolecular interactions and the formation of delocalized excited states. Calculations were carried out to explain the basic similarities and differences in excitations of the model compounds such as diphenylbutadiyne and the macrocycles. The fundamental excitation in these systems can be primarily described as a pi --> pi* transition. Two low-energy resonances were observed from experiment for the annulene systems, and possible explanations for these low-energy resonances in the macrocycles are explored. The significant difference found in the calculated oscillator strength of the two low-energy bands for the macrocycles as well as the dynamics of solvent interactions was further investigated by three-pulse photon echo measurements. A simple exciton model was developed to discuss the excitations in the larger macrocycles. The results from this model were found to be in good agreement with the TD-DFT calculations.
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Affiliation(s)
- Smriti Anand
- Department of Chemistry and Institute for Scientific Computing, Wayne State University, Detroit, Michigan 48202, USA
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Wang Y, He GS, Prasad PN, Goodson T. Ultrafast Dynamics in Multibranched Structures with Enhanced Two-Photon Absorption. J Am Chem Soc 2005; 127:10128-9. [PMID: 16028898 DOI: 10.1021/ja051099i] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The understanding of the mechanism of the enhanced two-photon absorption (TPA) in multibranched chromophore systems is of importance to the design of materials with the large TPA cross-sections and for future applications. In this communication, the mechanism of enhanced TPA properties is investigated. For a dendritic model system, the excited-state dynamics for both population (T1-process) and phase relaxation (T2-process) processes involved are investigated by a combination of time-resolved spectroscopic techniques. The results of time-resolved fluorescence anisotropy are compared with previous results obtained from other branched chromophore systems. It is found that the PRL-701 trimer system, which possesses the large enhancement of two-photon absorption cross-section, gives a faster anisotropy decay (fluorescence upconversion and transient absorption), a longer population relaxation time (fluorescence lifetime), and a weaker coupling to the solvent (a larger photon echo peak shift initial value). New strategies for rational design of large TPA materials can be achieved based on a better understanding of the mechanism of the enhancement.
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Affiliation(s)
- Ying Wang
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
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Abstract
Organic dendrimers have been considered for a number of optical applications and are now of great interest for the purpose of enhanced nonlinear optical effects. In order to understand the mechanism of the enhanced effects in branched structures it is important to probe the fundamental excitations and the degree of intramolecular interactions utilizing various spectroscopic techniques. In this review, the nonlinear optical and excited state dynamics of different dendritic and other branching chromophore structures are discussed. The methods of two-photon absorption, time-resolved fluorescence, transient absorption, and three-pulse photon echo peak shift are discussed in regards to the degree of intramolecular coupling in the macromolecular systems. These techniques are also used for a comparison of the dynamics in the linear molecular analog systems as well. Thus, this review focuses on the aspect of intramolecular interactions in a branched system and its importance to enhanced nonlinear optical effects useful for modern optical devices.
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Affiliation(s)
- T Goodson
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA.
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Li B, Tong R, Zhu R, Meng F, Tian H, Qian S. The Ultrafast Dynamics and Nonlinear Optical Properties of Tribranched Styryl Derivatives Based on 1,3,5-Triazine. J Phys Chem B 2005; 109:10705-10. [PMID: 16852300 DOI: 10.1021/jp050368o] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
By using the femtosecond laser spectroscopic techniques, we have studied the ultrafast response and the nonlinear optical properties of three molecules with donor-acceptor structure (denoted as T01, T02, and T03). Two-photon absorption (2PA) cross sections measured by the open aperture Z-scan technique were determined to be 77, 90, and 410 GM for T01, T02, and T03, respectively. The relaxation dynamics of the excited states were measured by two-color femtosecond pump-probe and time-resolved photoluminescence (PL) experiments. By changing the solvent from chloroform (CHCl3) to dimethyl sulfoxide (DMSO), the transient dynamics was found changed significantly and the decay time of PL emission decreased dramatically because DMSO with large dipole moment accelerates the cross-transfer process and the nonradiative process in the molecules.
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Affiliation(s)
- Bo Li
- Physics Department, Fudan University, Shanghai 200433, China
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Goodson TG. Optical excitations in organic dendrimers investigated by time-resolved and nonlinear optical spectroscopy. Acc Chem Res 2005; 38:99-107. [PMID: 15709729 DOI: 10.1021/ar020247w] [Citation(s) in RCA: 163] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Our research is concerned with the optical properties of covalently bound branched multichromophore systems. The presence of strong intramolecular interactions in dendrimers and other branched macromolecules has stimulated new approaches toward improved energy transfer and light-emitting and enhanced nonlinear optical materials, as well as the possibility of delocalized (exciton) excitations in molecular aggregates. This Account summarizes some of our investigations, which combine the use of different time-resolved techniques to examine the dynamics in organic (conjugated) branched structures and provide important structure-function correlations necessary for applications.
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Affiliation(s)
- T G Goodson
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA.
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