1
|
Mimura Y, Motomura Y, Kitamatsu M, Imai Y. Controlling the sign of Excimer‐Origin Circularly Polarised Luminescence by Balancing Hydrophilicity/Hydrophobicity in Bipyrenyl Arginine Peptides. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yuki Mimura
- Department of Applied Chemistry Faculty of Science and Engineering Kindai University 3-4-1 Kowakae, Higashi-Osaka Osaka 577-8502 Japan
| | - Yuki Motomura
- Department of Applied Chemistry Faculty of Science and Engineering Kindai University 3-4-1 Kowakae, Higashi-Osaka Osaka 577-8502 Japan
| | - Mizuki Kitamatsu
- Department of Applied Chemistry Faculty of Science and Engineering Kindai University 3-4-1 Kowakae, Higashi-Osaka Osaka 577-8502 Japan
| | - Yoshitane Imai
- Department of Applied Chemistry Faculty of Science and Engineering Kindai University 3-4-1 Kowakae, Higashi-Osaka Osaka 577-8502 Japan
| |
Collapse
|
2
|
Sign inversion of excimer circularly polarized luminescence in water-soluble bipyrenyl oligopeptides through an odd-even effect. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152238] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
3
|
Complexation of a cationic pyrene derivative with sulfobutylether substituted β-cyclodextrin: Towards a stimulus-responsive supramolecular material. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112840] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
4
|
Pandey SP, Singh PK. A ratiometric scheme for the fluorescent detection of protamine, a heparin antidote. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112589] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
5
|
Slavgorodska M, Kyrychenko A. Structure and Dynamics of Pyrene-Labeled Poly(acrylic acid): Molecular Dynamics Simulation Study. CHEMISTRY & CHEMICAL TECHNOLOGY 2020. [DOI: 10.23939/chcht14.01.076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
6
|
Singh G, Singh PK. Stimulus-Responsive Supramolecular Host-Guest Assembly of a Cationic Pyrene Derivative with Sulfated β-Cyclodextrin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14628-14638. [PMID: 31609124 DOI: 10.1021/acs.langmuir.9b03083] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
In general, aggregation-prone organic molecules are prevented from self-aggregation in the presence of macrocyclic hosts like β-cyclodextrin because of their preference for the formation of inclusion complex with guest molecules. On the contrary, sulfate-laced β-cyclodextrin has been recently reported to induce the aggregation of some of the non-aggregation-prone organic dyes, which have been subsequently utilized for biosensing applications. In the present contribution, we report the interaction of a cationic organic probe molecule, 1-pyrene methyl amine (PMA), which belongs to one of the most useful families of organic fluorescent probes, that is, pyrene, with a sulfated β-cyclodextrin derivative (SCD). Interaction of a cationic probe with a β-cyclodextrin derivative was studied using a variety of photophysical methods such as ground-state absorption, steady-state emission, and time-resolved emission techniques. Detailed photophysical investigations have revealed that SCD induces the ground-state association of PMA molecules. This SCD-induced aggregation of PMA molecules has been attributed to the charge neutralization of the cationic probe by negatively charged sulfate groups, which subsequently lead to their association because of the close proximity on the rims of cyclodextrin. This monomer-dimer equilibrium of the PMA-SCD system is found to be extremely responsive to external chemical stimuli like temperature, pH, ionic strength of the medium, and organic solvent (dimethyl sulfoxide), which projects them as potential platforms for various sensing applications including bioanalytes. The supramolecular assembly has been demonstrated to sense arginine.
Collapse
Affiliation(s)
- Gaurav Singh
- UM-DAE Centre for Excellence in Basic Sciences , University of Mumbai , Kalina, Santacruz (E), Mumbai 400 098 , India
| | - Prabhat K Singh
- Radiation & Photochemistry Division , Bhabha Atomic Research Centre , Mumbai 400 085 , India
- Homi Bhabha National Institute , Training School Complex, Anushaktinagar, Mumbai 400 094 , India
| |
Collapse
|
7
|
Kalyani VS, Gawhale ST, Rathod NV, Singh PK, Malkhede DD. pH Dependent Self‐Assembly of Single‐Pyrene‐Armed Calix[4]arene: Modulation and Complexation with p‐Sulfonatocalix[6]arene. ChemistrySelect 2019. [DOI: 10.1002/slct.201902363] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Vrashali S. Kalyani
- Department of ChemistrySavitribai Phule Pune University, Pune India-41100
- Department of Engineering SciencesAISSMS COE, Kenedy road, Pune India-411001
| | | | - Nilesh V. Rathod
- Department of ChemistrySavitribai Phule Pune University, Pune India-41100
- Department of Chemistry, R.A. Arts, Shri, M. K. Commerce and ShriS. R. Rathi Science College Washim 444505 India
| | - Prabhat K. Singh
- Department of Chemistry, R.A. Arts, Shri, M. K. Commerce and ShriS. R. Rathi Science College Washim 444505 India
- Radiation and Photochemistry DivisionBhabha Atomic Research Centre, Mumbai India
| | | |
Collapse
|
8
|
Mimura Y, Kitamura S, Shizuma M, Kitamatsu M, Imai Y. Circular dichroism and circularly polarised luminescence of bipyrenyl oligopeptides, with piperidines added in the peptide chains. Org Biomol Chem 2019; 16:8273-8279. [PMID: 30140836 DOI: 10.1039/c8ob01869c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Upon combining chiral peptides (the most basic chiral source) with pyrene moieties, we found that chiral oligopeptides bearing two-pendant pyrenyl units exhibited circularly polarised luminescence (CPL) originating from intramolecular excimers at 450-490 nm in various solvents, and the sign of their CPL signals depended on the type of solvent employed. The CPL and circular dichroism signs and intensities could be tuned by the introduction of a piperidine unit into the chiral peptide chain; thus, the obtained structure could be considered a practical Lock ON-OFF system for oligopeptide luminophores.
Collapse
Affiliation(s)
- Yuki Mimura
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | | | | | | | | |
Collapse
|
9
|
Takaya T, Oda T, Shibazaki Y, Hayashi Y, Shimomoto H, Ihara E, Ishibashi Y, Asahi T, Iwata K. Excited-State Dynamics of Pyrene Incorporated into Poly(substituted methylene)s: Effects of Dense Packing of Pyrenes on Excimer Formation. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01060] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Tomohisa Takaya
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
| | - Tatsuya Oda
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama 790-8577, Japan
| | - Yuki Shibazaki
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama 790-8577, Japan
| | - Yumiko Hayashi
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama 790-8577, Japan
| | - Hiroaki Shimomoto
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama 790-8577, Japan
| | - Eiji Ihara
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama 790-8577, Japan
| | - Yukihide Ishibashi
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama 790-8577, Japan
| | - Tsuyoshi Asahi
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama 790-8577, Japan
| | - Koichi Iwata
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
| |
Collapse
|
10
|
Hoche J, Schmitt HC, Humeniuk A, Fischer I, Mitrić R, Röhr MIS. The mechanism of excimer formation: an experimental and theoretical study on the pyrene dimer. Phys Chem Chem Phys 2018; 19:25002-25015. [PMID: 28876005 DOI: 10.1039/c7cp03990e] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The understanding of excimer formation in organic materials is of fundamental importance, since excimers profoundly influence their functional performance in applications such as light-harvesting, photovoltaics or organic electronics. We present a joint experimental and theoretical study of the ultrafast dynamics of excimer formation in the pyrene dimer in a supersonic jet, which is the archetype of an excimer forming system. We perform simulations of the nonadiabatic photodynamics in the frame of TDDFT that reveal two distinct excimer formation pathways in the gas-phase dimer. The first pathway involves local excited state relaxation close to the initial Franck-Condon geometry that is characterized by a strong excitation of the stacking coordinate exhibiting damped oscillations with a period of 350 fs that persist for several picoseconds. The second excimer forming pathway involves large amplitude oscillations along the parallel shift coordinate with a period of ≈900 fs that after intramolecular vibrational energy redistribution leads to the formation of a perfectly stacked dimer. The electronic relaxation within the excitonic manifold is mediated by the presence of intermolecular conical intersections formed between fully delocalized excitonic states. Such conical intersections may generally arise in stacked π-conjugated aggregates due to the interplay between the long-range and short-range electronic coupling. The simulations are supported by picosecond photoionization experiments in a supersonic jet that provide a time-constant for the excimer formation of around 6-7 ps, in good agreement with theory. Finally, in order to explore how the crystal environment influences the excimer formation dynamics we perform large scale QM/MM nonadiabatic dynamics simulations on a pyrene crystal in the framework of the long-range corrected tight-binding TDDFT. In contrast to the isolated dimer, the excimer formation in the crystal follows a single reaction pathway in which the initially excited parallel slip motion is strongly damped by the interaction with the surrounding molecules leading to the slow excimer stabilization on a picosecond time scale.
Collapse
Affiliation(s)
- Joscha Hoche
- Institut für Physikalische und Theoretische Chemie, Julius-Maximilians-Universität Würzburg, D-97074, Würzburg, Germany.
| | | | | | | | | | | |
Collapse
|
11
|
Mimura Y, Kitamura S, Shizuma M, Kitamatsu M, Fujiki M, Imai Y. Solvent-Sensitive Sign Inversion of Excimer Origin Circularly Polarized Luminescence in Bipyrenyl Peptides. ChemistrySelect 2017. [DOI: 10.1002/slct.201701315] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Yuki Mimura
- Department of Applied Chemistry; Faculty of Science and Engineering; Kindai University, 3-4-1 Kowakae, Higashi-Osaka; Osaka 577-8502 Japan
| | - Sayaka Kitamura
- Department of Applied Chemistry; Faculty of Science and Engineering; Kindai University, 3-4-1 Kowakae, Higashi-Osaka; Osaka 577-8502 Japan
| | - Motohiro Shizuma
- Department of Biochemistry; Osaka Municipal Technical Research Institute, 1-6-50 Morinomiya, Joto-ku; Osaka 536-8553 Japan
| | - Mizuki Kitamatsu
- Department of Applied Chemistry; Faculty of Science and Engineering; Kindai University, 3-4-1 Kowakae, Higashi-Osaka; Osaka 577-8502 Japan
| | - Michiya Fujiki
- Graduate School of Materials Science; Nara Institute of School and Technology, Takayama, Ikoma; Nara 630-0192 Japan
| | - Yoshitane Imai
- Department of Applied Chemistry; Faculty of Science and Engineering; Kindai University, 3-4-1 Kowakae, Higashi-Osaka; Osaka 577-8502 Japan
| |
Collapse
|
12
|
Nishikawa T, Kitamura S, Kitamatsu M, Fujiki M, Imai Y. Peptide Magic: Interdistance-Sensitive Sign Inversion of Excimer Circularly Polarized Luminescence in Bipyrenyl Oligopeptides. ChemistrySelect 2016. [DOI: 10.1002/slct.201600212] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Tomoki Nishikawa
- Department of Applied Chemistry; Faculty of Science and Engineering; Kinki University; 3-4-1 Kowakae, Higashi-Osaka Osaka 577-8502 Japan
| | - Sayaka Kitamura
- Department of Applied Chemistry; Faculty of Science and Engineering; Kinki University; 3-4-1 Kowakae, Higashi-Osaka Osaka 577-8502 Japan
| | - Mizuki Kitamatsu
- Department of Applied Chemistry; Faculty of Science and Engineering; Kinki University; 3-4-1 Kowakae, Higashi-Osaka Osaka 577-8502 Japan
| | - Michiya Fujiki
- Graduate School of Materials Science; Nara Institute of School and Technology; Takayama, Ikoma Nara 630-0192 Japan
| | - Yoshitane Imai
- Department of Applied Chemistry; Faculty of Science and Engineering; Kinki University; 3-4-1 Kowakae, Higashi-Osaka Osaka 577-8502 Japan
| |
Collapse
|
13
|
Costa AL, Gomes AC, Pillinger M, Gonçalves IS, Seixas de Melo JS. Controlling the fluorescence behavior of 1-pyrenesulfonate by cointercalation with a surfactant in a layered double hydroxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4769-4778. [PMID: 25848919 DOI: 10.1021/acs.langmuir.5b00063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Zn-Al layered double hydroxides (LDHs) containing solely 1-pyrenesulfonate (PS) or 1-heptanesulfonate (HS) anions, or a mixture of the two with HS/PS molar ratios ranging between ca. 7.5 and 82, were prepared by the direct synthesis method and characterized by powder X-ray diffraction, thermal and elemental analyses, scanning electron microscopy, and FT-IR, FT-Raman, and (13)C{(1)H} CP MAS NMR spectroscopies. Well-ordered intercalates were obtained with basal spacings of 18.8 Å for the LDH intercalated by PS and 19.2-19.4 Å for the other materials containing HS. The photophysics of the solids, as well as the PS probe dissolved in water and common organic solvents (aiming to compare the behavior of the "isolated" molecule with that in the solid), were investigated by steady-state and time-resolved fluorescence techniques. The fluorescence spectra of the solid samples display two bands with maxima at 376 and 495 nm. Depending on the HS/PS ratios, the band intensity ratio (obtained at 375 and 520 nm) changes, reflecting different contributions from monomer and dimer species. The decays collected at 375 nm are biexponentials with a major component (∼97% of the total fluorescence) of 105 ns for the highest HS/PS ratio, which further loses importance with an increase in the PS content. When the decays are collected at 480 and 520 nm, the fits are triexponentials with a major component varying from 108 to 124 ns, attributed to an excimer. Steady-state and time-resolved measurements with PS in solution (ethanol, methanol, DMF, DMSO, and water) were also measured, and a comparison of the vibronic I1/I3 ratio and lifetimes in water (65 ns) with those in the LDHs indicates that the PS probe in the cointercalated LDHs is surrounded by the HS surfactant.
Collapse
Affiliation(s)
- Ana L Costa
- †Coimbra Chemistry Centre, Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal
- ‡Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Ana C Gomes
- ‡Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Martyn Pillinger
- ‡Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Isabel S Gonçalves
- ‡Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - J Sérgio Seixas de Melo
- †Coimbra Chemistry Centre, Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal
| |
Collapse
|
14
|
Miyazaki M, Fujii M. Real time observation of the excimer formation dynamics of a gas phase benzene dimer by picosecond pump–probe spectroscopy. Phys Chem Chem Phys 2015; 17:25989-97. [DOI: 10.1039/c5cp03010b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoexcitation of a T-shaped benzene dimer provides a sandwiched excimer in 10 ps accompanying a 1000 times faster intracluster vibrational energy redistribution rate than that of the benzene monomer.
Collapse
Affiliation(s)
- Mitsuhiko Miyazaki
- Chemical Spectroscopy Division
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Midori-ku
- Japan
| | - Masaaki Fujii
- Chemical Spectroscopy Division
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Midori-ku
- Japan
| |
Collapse
|
15
|
Nishikawa T, Tajima N, Kitamatsu M, Fujiki M, Imai Y. Circularly polarised luminescence and circular dichroism of l- and d-oligopeptides with multiple pyrenes. Org Biomol Chem 2015; 13:11426-31. [DOI: 10.1039/c5ob01710f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Among l- and d-oligopeptides with multiple pyrenes as pendants, the dipeptides with two and three pyrenes showed blue-coloured circularly polarised luminescence as high as |gem| ≈ (0.86−1.1) × 10−2 at around 450 nm, reflecting from exciton couplets of twisted pyrenes.
Collapse
Affiliation(s)
- Tomoki Nishikawa
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Kinki University
- Higashi-Osaka
- Japan
| | - Nobuo Tajima
- Computational Materials Science Center
- National Institute for Materials Science
- Tsukuba
- Japan
| | - Mizuki Kitamatsu
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Kinki University
- Higashi-Osaka
- Japan
| | - Michiya Fujiki
- Graduate School of Materials Science
- Nara Institute of Science and Technology
- Ikoma
- Japan
| | - Yoshitane Imai
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Kinki University
- Higashi-Osaka
- Japan
| |
Collapse
|
16
|
Kaushlendra K, Asha SK. H-Bonding vs Non-H-Bonding in 100% Pyrene Methacrylate Comb Polymers: Self-Assembly Probed by Time-Resolved Emission Spectra and Temperature Dependent Fluorescence. J Phys Chem B 2014; 118:4951-62. [DOI: 10.1021/jp501346b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- K. Kaushlendra
- Polymer & Advanced Material Laboratory, Polymer Science & Engineering Division, CSIR-NCL, Pune 411008, Maharashtra, India
| | - S. K. Asha
- Polymer & Advanced Material Laboratory, Polymer Science & Engineering Division, CSIR-NCL, Pune 411008, Maharashtra, India
| |
Collapse
|
17
|
Kaushlendra K, Asha SK. Variable-Temperature Time-Resolved Emission Spectra Studies of Random Pyrene Urethane Methacrylate Copolymers with High Pyrene Incorporation. J Phys Chem B 2013; 117:11863-76. [DOI: 10.1021/jp406885f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- K. Kaushlendra
- Polymer Science & Engineering Division, CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India
| | - S. K. Asha
- Polymer Science & Engineering Division, CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India
| |
Collapse
|
18
|
Chen S, Duhamel J. Probing the hydrophobic interactions of a series of pyrene end-labeled poly(ethylene oxide)s in aqueous solution using time-resolved fluorescence. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2821-2834. [PMID: 23305407 DOI: 10.1021/la304628d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The hydrophobic association of a series of poly(ethylene oxide)s covalently labeled at both ends with pyrene (PEO(X)-Py2 where X represents the number average molecular weight (Mn) of the PEO chains equal to 2, 5, 10, and 16.5 kDa) in aqueous solutions was investigated at different polymer concentrations (CP) using steady-state and time-resolved fluorescence measurements. Phase separation was observed with PEO(2 kDa)-Py2 and PEO(5 kDa)-Py2 samples at high CP. The steady-state fluorescence spectra showed that the ratios of excimer-to-monomer fluorescence intensities (IE/IM) of all PEO samples remained constant when CP was below 4 × 10(-5) M and decreased dramatically with increasing PEO chain length due to a decrease in intramolecular pyrene excimer formation. The IE/IM ratio in this regime was found to scale as Mn(-2.3±0.2). For CP > 4 × 10(-5) M, pyrene excimer is formed by both intra- and intermolecular interactions and the IE/IM ratio increases linearly with increasing CP except for PEO(2 kDa)-Py2 which undergoes phase separation. The decays obtained at various polymer concentrations were fitted according to a "sequential model" (SM) which assumes that the pyrene excimer is formed in a sequential manner. The molar fractions of all excited pyrene species and the rate constants for pyrene excimer formation were determined from the global analysis of the monomer and excimer fluorescence decays. The fraction of pyrenes that formed excimer from ground-state pyrene aggregates (fE0) was found to increase with CP in the regime where the pyrene excimer is formed both intra- and intermolecularly and decrease with Mn in the regime where the pyrene excimer is formed only intramolecularly. The fraction of pyrene pendants subject to hydrophobic interactions were used to determine the hydrophobic capture radius (Rc) of pyrene in water from the distribution of PEO end-to-end distances. Rc was found to equal 2.2 ± 0.2 nm using fE0.
Collapse
Affiliation(s)
- Shaohua Chen
- Institute for Polymer Research, Waterloo Institute for Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | | |
Collapse
|
19
|
Zhang R, Yang L, Zhao M, Dong J, Dong H, Wen Y, Zhan X, Yang H, Wang G. Synthesis and fluorescence study of a pyrene-functionalized poly(4-vinylpyridine) quaternary ammonium for detection of DNA hybridization. POLYMER 2013. [DOI: 10.1016/j.polymer.2012.12.080] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
20
|
Ihara E, Okada R, Sogai T, Asano T, Kida M, Inoue K, Itoh T, Shimomoto H, Ishibashi Y, Asahi T. Pd-mediated polymerization of diazoacetates with aromatic ester group: Synthesis and photophysical property of poly(1-pyrenylmethoxycarbonylmethylene). ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26480] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
21
|
Fernández-Lodeiro J, Núñez C, de Castro CS, Bértolo E, Seixas de Melo JS, Capelo JL, Lodeiro C. Steady-State and Time-Resolved Investigations on Pyrene-Based Chemosensors. Inorg Chem 2012; 52:121-9. [DOI: 10.1021/ic301365y] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Javier Fernández-Lodeiro
- Grupo BIOSCOPE, Departamento
de Química, Facultade de Ciencias, Campus de Ourense, Universidade de Vigo, 32004 Vigo, Spain
- REQUIMTE/CQFB, Departamento
de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte de Caparica,
Portugal
| | - Cristina Núñez
- REQUIMTE/CQFB, Departamento
de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte de Caparica,
Portugal
| | | | - Emilia Bértolo
- Ecology Research Group, Department of Geographical and
Life Sciences, Canterbury Christ Church University, Canterbury, Kent CT1 1QU, United Kingdom
| | | | - José Luis Capelo
- Grupo BIOSCOPE, Departamento
de Química, Facultade de Ciencias, Campus de Ourense, Universidade de Vigo, 32004 Vigo, Spain
- REQUIMTE/CQFB, Departamento
de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte de Caparica,
Portugal
| | - Carlos Lodeiro
- Grupo BIOSCOPE, Departamento
de Química, Facultade de Ciencias, Campus de Ourense, Universidade de Vigo, 32004 Vigo, Spain
- REQUIMTE/CQFB, Departamento
de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte de Caparica,
Portugal
| |
Collapse
|
22
|
Yang L, Zhao M, Zhang R, Dong J, Zhang T, Zhan X, Wang G. Synthesis and Fluorescence Study of a Quaternized Copolymer Containing Pyrene for DNA-Hybridization Detection. Chemphyschem 2012; 13:4099-104. [DOI: 10.1002/cphc.201200765] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Indexed: 12/27/2022]
|
23
|
Kashyap S, Jayakannan M. Amphiphilic Diblocks Sorting into Multivesicular Bodies and Their Fluorophore Encapsulation Capabilities. J Phys Chem B 2012; 116:9820-31. [DOI: 10.1021/jp304121d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Smita Kashyap
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune, Dr. Homi Bhabha Road, Pune 411008, Maharashtra, India
| | - M. Jayakannan
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune, Dr. Homi Bhabha Road, Pune 411008, Maharashtra, India
| |
Collapse
|
24
|
Gelover-Santiago A, Fowler MA, Yip J, Duhamel J, Burillo G, Rivera E. Unexpected absorbance enhancement upon clustering dyes in a polymer matrix. J Phys Chem B 2012; 116:6203-14. [PMID: 22594837 DOI: 10.1021/jp208646b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
PE films grafted with poly(methyl acrylate) and labeled with pyrene groups were obtained by irradiation with γ-rays in the presence of acryloyl chloride and further reacting them with 1-pyrenebutanol or 1-pyrenemethylamine. Characterization of the polymer films benefited from the dual use of the pyrene probe as an indicator of, first, polymer chain dynamics by monitoring pyrene excimer formation by fluorescence and, second, polymer morphology by staining the pyrene-rich domains of the films with RuO(4) for scanning electron microscopy (SEM). The grafted polymers labeled with 1-pyrenemethylamine showed much stronger absorbance than those labeled with 1-pyrenebutanol despite having similar pyrene contents. The fluorescence spectra of the grafted polymers labeled with 1-pyrenebutanol exhibited monomer emission, whereas those labeled with 1-pyrenemethylamine exhibited exclusively excimer emission. These dramatic differences could be accounted for by noting that labeling of the grafted poly(acryloyl chloride) with 1-pyrenemethylamine results in cross-linking of the polymer matrix, with an associated enhancement of the concentration of pyrene in the cross-linked domains, which was confirmed by SEM. Formation of discrete domains in the polymer film can induce multiple scattering at the domain boundaries which lengthens the path of light in the film and increases absorption of the light by the tightly packed pyrene-rich domains. Implementation of this effect for fabrication of plastic color filters should generate more efficient filters which should find numerous practical applications.
Collapse
Affiliation(s)
- Adriana Gelover-Santiago
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, México
| | | | | | | | | | | |
Collapse
|
25
|
Li Y, Yang J, Li J, Liu Y, Liu W. Revisiting differences in the thermoresponsive behavior of PNIPAAm and PMEO2MA aqueous solutions. RSC Adv 2012. [DOI: 10.1039/c2ra01208a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
|