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Dekermenjian M, Ruediger AP, Merlen A. Raman spectroscopy investigation of magnesium oxide nanoparticles. RSC Adv 2023; 13:26683-26689. [PMID: 37681036 PMCID: PMC10481257 DOI: 10.1039/d3ra04492k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 08/26/2023] [Indexed: 09/09/2023] Open
Abstract
We investigate Raman spectra (100 cm-1 to 3900 cm-1) of magnesium oxide nanoparticles with nominal sizes of 10 nm, 20 nm, 40 nm, 50 nm, and 300 nm. The crystal structure of MgO prohibits first-order modes and yet, there are numerous reports of relatively intense peaks throughout the literature. Raman signals at approximately 278 cm-1 and 445 cm-1 that were attributed to MgO nanoparticles by previous authors are shown to belong to layers of Mg(OH)2 formed on the surface of MgO nanoparticles. Through an annealing process at 400 °C in an O2 atmosphere, we observe that modes in the 3700 cm-1 spectral region, which are a signature of OH groups, disappear together with modes at 278 cm-1 and 445 cm-1, thus establishing a necessary criterion to associate all of these peaks to the presence of OH groups on the surface.
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Gurumendi M, López F, Borrero-González LJ, Terencio T, Caetano M, Reinoso C, González G. Enhanced Chitosan Photoluminescence by Incorporation of Lithium Perchlorate. ACS OMEGA 2023; 8:13763-13774. [PMID: 37091431 PMCID: PMC10116549 DOI: 10.1021/acsomega.2c08072] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 03/16/2023] [Indexed: 05/03/2023]
Abstract
An improvement in chitosan film photoluminescence was observed after adding LiClO4. FTIR spectra, XPS, DFT calculations, and XRD measurements show an alteration of the H-bonds and an increase in the amorphous character of chitosan. PL spectra display a growth in intensity in the visible region along with the incorporation of lithium, signaling a possible rise in the population density of tail states and, consequently, better photon absorption, as observed from UV-vis measurements. A mechanism through aggregation-induced emission effect is proposed to explain the different results. Although this work establishes the relation between structural changes provoked by LiClO4 incorporation and luminescence in the case of chitosan, we expect that the same approach could be generalized to similar polymeric structures.
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Affiliation(s)
- Marlon Gurumendi
- Yachay
Tech University, School of Physical
Sciences and Nanotechnology, Urcuquí, 100119, Ecuador
| | - Floralba López
- Yachay
Tech University, School of Chemical
Sciences and Engineering, Urcuquí, 100119, Ecuador
| | - Luis J. Borrero-González
- Pontificia
Universidad Católica del Ecuador, Facultad de Ciencias Exactas y Naturales, Escuela de Ciencias Físicas
y Matemática, Laboratorio de Óptica Aplicada, Quito, 17-01-2184, Ecuador
| | - Thibault Terencio
- Yachay
Tech University, School of Chemical
Sciences and Engineering, Urcuquí, 100119, Ecuador
| | - Manuel Caetano
- Yachay
Tech University, School of Chemical
Sciences and Engineering, Urcuquí, 100119, Ecuador
- Universidad
Central de Venezuela, Facultad de Ciencias,
Escuela de Química, Caracas, 1020A, Venezuela
| | - Carlos Reinoso
- Yachay
Tech University, School of Physical
Sciences and Nanotechnology, Urcuquí, 100119, Ecuador
| | - Gema González
- Yachay
Tech University, School of Physical
Sciences and Nanotechnology, Urcuquí, 100119, Ecuador
- Centro
de Ingenieria de Materiales y Nanotecnologia, Instituto Venezolano de Investigaciones Cientificas, Caracas, 1020A, Venezuela
- E-mail:
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3
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Chen Y, Li R, Yang L, Wang R, Li Z, Li T, Liu M, Ramakrishna S, Long Y. Synergistic Effects of Magnetic Z-Scheme g-C 3N 4/CoFe 2O 4 Nanofibres with Controllable Morphology on Photocatalytic Activity. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1142. [PMID: 37049235 PMCID: PMC10096916 DOI: 10.3390/nano13071142] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 03/15/2023] [Accepted: 03/15/2023] [Indexed: 06/19/2023]
Abstract
The rational design of interfacial contacts plays a decisive role in improving interfacial carrier transfer and separation in heterojunction photocatalysts. In Z-scheme photocatalysts, the recombination of photogenerated electron-hole pairs is prevented so that the redox capacity is maintained. Here, one-dimensional graphitic carbon nitride (g-C3N4)/CoFe2O4 fibres were synthesised as a new type of magnetic Z-scheme visible-light photocatalyst. Compared with pure g-C3N4 and CoFe2O4, the prepared composite photocatalysts showed considerably improved performance for the photooxidative degradation of tetracycline and methylene blue. In particular, the photodegradation efficiency of the g-C3N4/CoFe2O4 fibres for methylene blue was approximately two and seven times those of g-C3N4 and CoFe2O4, respectively. The formation mechanism of the Z-scheme heterojunctions in the g-C3N4/CoFe2O4 fibres was investigated using photocurrent spectroscopy and electrochemical impedance spectroscopy. We proposed that one of the reasons for the improved photodegradation performance is that the charge transport path in one-dimensional materials enables efficient photoelectron and hole transfer. Furthermore, the internal electric field of the prepared Z-scheme photocatalyst enhanced visible-light absorption, which provided a barrier for photoelectron-hole pair recombination.
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Affiliation(s)
- Yelin Chen
- Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao 266071, China
| | - Ru Li
- Instrumental Analysis Center of Qingdao University, Qingdao 266071, China
| | - Lei Yang
- Research Center for Intelligent & Wearable Technology, College of Textiles & Clothing, Qingdao University, Qingdao 266071, China
| | - Rongxu Wang
- Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao 266071, China
| | - Zhi Li
- Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao 266071, China
| | - Tong Li
- Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao 266071, China
| | - Meijie Liu
- Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao 266071, China
| | - Seeram Ramakrishna
- Center for Nanofibers & Nanotechnology, Faculty of Engineering, National University of Singapore, Singapore 119077, Singapore
| | - Yunze Long
- Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao 266071, China
- State Key Laboratory of Bio-Fibers & Eco-Textiles, Qingdao University, Qingdao 266071, China
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4
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Paranthaman S, Uthaiah CA, Osmani RAM, Hani U, Ghazwani M, Alamri AH, Fatease AA, Madhunapantula SV, Gowda DV. Anti-Proliferative Potential of Quercetin Loaded Polymeric Mixed Micelles on Rat C6 and Human U87MG Glioma Cells. Pharmaceutics 2022; 14:1643. [PMID: 36015268 PMCID: PMC9412540 DOI: 10.3390/pharmaceutics14081643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 07/26/2022] [Accepted: 07/27/2022] [Indexed: 12/04/2022] Open
Abstract
Quercetin (Qu) is a natural flavonoid present in many commonly consumed food items and is also identified as a potential anticancer agent. The present study evaluates the Qu-loaded polymeric mixed micelles (Qu-PMMs) against C6 and U87MG glioma cell lines. The Box-Behnken Design (BBD) was employed to study the influence of independent variables such as Soluplus, Vitamin-E polyethyleneglycol-1000 succinate (E-TPGS), and poloxamer 407 concentrations on dependent variables including particle size (PS), polydispersity index (PDI), and percentage entrapment efficiency (%EE) of the prepared Qu-PMMs. The Qu-PMMs were further characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), and were assessed for in vitro drug release, effect on cell viability, migration, cellular uptake, and apoptosis assays. The PS, PDI, and % EE of the optimized PMMs were 107.16 ± 1.06 nm, 0.236 ± 0.053, and 77.46 ± 1.94%, respectively. The FTIR and XRD revealed that the Qu was completely entrapped inside the PMMs. The SEM analysis confirmed the spherical shape of micelles. The in vitro cell viability study showed that the Qu-PMMs had 1.7 times higher cytotoxicity against C6 and U87MG cells than Qu pure drug (Qu-PD). Furthermore, Qu-PMMs demonstrated superior cellular uptake, inhibited migration, and induced apoptosis when tested against C6 and U87MG cells than pure Qu. Thus, the polymeric mixed micelle (PMMs) enhanced the therapeutic effect of Qu and can be considered an effective therapeutic strategy to treat Glioma.
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Affiliation(s)
- Sathishbabu Paranthaman
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Mysuru 570015, Karnataka, India
| | - Chinnappa A. Uthaiah
- Centre of Excellence in Molecular Biology and Regenerative Medicine (CEMR) Laboratory, (a DST-FIST Sponsored Centre), Department of Biochemistry (a DST-FIST Sponsored Department), JSS Medical College, JSS Academy of Higher Education & Research (JSS AHER), Mysuru 570015, Karnataka, India
| | - Riyaz Ali M. Osmani
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Mysuru 570015, Karnataka, India
| | - Umme Hani
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Guraiger, Abha 61421, Saudi Arabia
| | - Mohammed Ghazwani
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Guraiger, Abha 61421, Saudi Arabia
- Cancer Research Unit, King Khalid University, Guraiger, Abha 61421, Saudi Arabia
| | - Ali H. Alamri
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Guraiger, Abha 61421, Saudi Arabia
| | - Adel Al Fatease
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Guraiger, Abha 61421, Saudi Arabia
| | - SubbaRao V. Madhunapantula
- Centre of Excellence in Molecular Biology and Regenerative Medicine (CEMR) Laboratory, (a DST-FIST Sponsored Centre), Department of Biochemistry (a DST-FIST Sponsored Department), JSS Medical College, JSS Academy of Higher Education & Research (JSS AHER), Mysuru 570015, Karnataka, India
| | - Devegowda Vishkante Gowda
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Mysuru 570015, Karnataka, India
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Toader G, Pulpea D, Rotariu T, Diacon A, Rusen E, Moldovan A, Podaru A, Ginghină R, Alexe F, Iorga O, Bajenaru SA, Ungureanu M, Dîrloman F, Pulpea B, Leonat L. Strippable Polymeric Nanocomposites Comprising "Green" Chelates, for the Removal of Heavy Metals and Radionuclides. Polymers (Basel) 2021; 13:4194. [PMID: 34883697 PMCID: PMC8659526 DOI: 10.3390/polym13234194] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/23/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022] Open
Abstract
The issue of heavy metal and radionuclide contamination is still causing a great deal of concern worldwide for environmental protection and industrial sites remediation. Various techniques have been developed for surface decontamination aiming for high decontamination factors (DF) and minimal environmental impact, but strippable polymeric nanocomposite coatings are some of the best candidates in this area. In this study, novel strippable coatings for heavy metal and radionuclides decontamination were developed based on the film-forming ability of polyvinyl alcohol, with the remarkable metal retention capacity of bentonite nanoclay, together with the chelating ability of sodium alginate and with "new-generation" "green" complexing agents: iminodisuccinic acid (IDS) and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC). These environmentally friendly water-based decontamination solutions are capable of generating strippable polymeric films with optimized mechanical and thermal properties while exhibiting high decontamination efficiency (DF ≈ 95-98% for heavy metals tested on glass surface and DF ≈ 91-97% for radionuclides 241Am, 90Sr-Y and 137Cs on metal, painted metal, plastic, and glass surfaces).
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Affiliation(s)
- Gabriela Toader
- Military Technical Academy “Ferdinand I”, 39–49 George Coșbuc Boulevard, 050141 Bucharest, Romania; (G.T.); (D.P.); (A.M.); (A.P.); (M.U.); (F.D.); (B.P.)
| | - Daniela Pulpea
- Military Technical Academy “Ferdinand I”, 39–49 George Coșbuc Boulevard, 050141 Bucharest, Romania; (G.T.); (D.P.); (A.M.); (A.P.); (M.U.); (F.D.); (B.P.)
| | - Traian Rotariu
- Military Technical Academy “Ferdinand I”, 39–49 George Coșbuc Boulevard, 050141 Bucharest, Romania; (G.T.); (D.P.); (A.M.); (A.P.); (M.U.); (F.D.); (B.P.)
| | - Aurel Diacon
- Faculty of Applied Chemistry and Materials Science, University ‘Politehnica’ of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania;
| | - Edina Rusen
- Faculty of Applied Chemistry and Materials Science, University ‘Politehnica’ of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania;
| | - Andreea Moldovan
- Military Technical Academy “Ferdinand I”, 39–49 George Coșbuc Boulevard, 050141 Bucharest, Romania; (G.T.); (D.P.); (A.M.); (A.P.); (M.U.); (F.D.); (B.P.)
| | - Alice Podaru
- Military Technical Academy “Ferdinand I”, 39–49 George Coșbuc Boulevard, 050141 Bucharest, Romania; (G.T.); (D.P.); (A.M.); (A.P.); (M.U.); (F.D.); (B.P.)
| | - Raluca Ginghină
- Research and Innovation Center for CBRN Defense and Ecology, 225 Soseaua Oltenitei, 041327 Bucharest, Romania; (R.G.); (F.A.); (O.I.); (S.A.B.)
| | - Florentina Alexe
- Research and Innovation Center for CBRN Defense and Ecology, 225 Soseaua Oltenitei, 041327 Bucharest, Romania; (R.G.); (F.A.); (O.I.); (S.A.B.)
| | - Ovidiu Iorga
- Research and Innovation Center for CBRN Defense and Ecology, 225 Soseaua Oltenitei, 041327 Bucharest, Romania; (R.G.); (F.A.); (O.I.); (S.A.B.)
| | - Sorina Aurora Bajenaru
- Research and Innovation Center for CBRN Defense and Ecology, 225 Soseaua Oltenitei, 041327 Bucharest, Romania; (R.G.); (F.A.); (O.I.); (S.A.B.)
| | - Mihai Ungureanu
- Military Technical Academy “Ferdinand I”, 39–49 George Coșbuc Boulevard, 050141 Bucharest, Romania; (G.T.); (D.P.); (A.M.); (A.P.); (M.U.); (F.D.); (B.P.)
| | - Florin Dîrloman
- Military Technical Academy “Ferdinand I”, 39–49 George Coșbuc Boulevard, 050141 Bucharest, Romania; (G.T.); (D.P.); (A.M.); (A.P.); (M.U.); (F.D.); (B.P.)
| | - Bogdan Pulpea
- Military Technical Academy “Ferdinand I”, 39–49 George Coșbuc Boulevard, 050141 Bucharest, Romania; (G.T.); (D.P.); (A.M.); (A.P.); (M.U.); (F.D.); (B.P.)
| | - Lucia Leonat
- National Institute of Materials Physics, 077125 Măgurele, Romania;
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Xue K, Wang H, Lee PK, Dong S, Yu DYW. Chelating Polymer-Coated Separators with a BaTiO 3 Filler To Improve Reversibility and Round-Trip Efficiency of a 3.3 V Copper-Lithium Battery. ACS APPLIED MATERIALS & INTERFACES 2021; 13:47449-47457. [PMID: 34596373 DOI: 10.1021/acsami.1c11181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A novel 3.3 V copper-lithium battery using a copper foil as the cathode is a potential candidate for next-generation energy storage system due to its simple manufacturing process. However, the cross-over of copper ions from the cathode to the anode limits the reversibility of the battery. Herein, we suppress self-discharge and migration of copper ions in the cell using a commercial polypropylene separator with a coating of polyacrylic acid (PAA), a chelating polymer. Fourier transform infrared spectroscopy confirms that the PAA layer traps the copper ions and prevents them from passing through. The addition of barium titanate nanoparticles into the PAA layer further enhances ionic transfer through the separator and reduces polarization of the cell at high current rates during charge and discharge. The use of a chelating agent with an inorganic filler as a coating layer on the separator is a cost-effective way to improve reversibility and round-trip efficiency of copper-lithium batteries.
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Affiliation(s)
- Kaiming Xue
- School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong
| | - Huimin Wang
- School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong
| | - Pui-Kit Lee
- School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong
| | - Shuyu Dong
- School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong
| | - Denis Y W Yu
- School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong
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7
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Brünker P, Domenianni LI, Fleck N, Lindner J, Schiemann O, Vöhringer P. Intramolecular O-H⋯S hydrogen bonding in threefold symmetry: Line broadening dynamics from ultrafast 2DIR-spectroscopy and ab initio calculations. J Chem Phys 2021; 154:134305. [PMID: 33832237 DOI: 10.1063/5.0047885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dynamics of intramolecular hydrogen-bonding involving sulfur atoms as acceptors is studied using two-dimensional infrared (2DIR) spectroscopy. The molecular system is a tertiary alcohol whose donating hydroxy group is embedded in a hydrogen-bond potential with torsional C3-symmetry about the carbon-oxygen bond. The linear and 2DIR-spectra recorded in the OH-stretching region of the alcohol can be simulated very well using Kubo's line shape theory based on the cumulant expansion for evaluating the linear and nonlinear optical response functions. The correlation function for OH-stretching frequency fluctuations reveals an ultrafast component decaying with a time constant of 700 fs, which is in line with the apparent decay of the center line slopes averaged over absorption and bleach/emission signals. In addition, a quasi-static inhomogeneity is detected, which prevents the 2DIR line shape to fully homogenize within the observation window of 4 ps. The experimental data were then analyzed in more detail using a full ab initio approach that merges time-dependent structural information from classical molecular dynamics (MD) simulations with an OH-stretching frequency map derived from density functional theory (DFT). The latter method was also used to obtain a complementary transition dipole map to account for non-Condon effects. The 2DIR-spectra obtained from the MD/DFT method are in good agreement with the experimental data at early waiting delays, thereby corroborating an assignment of the fast decay of the correlation function to the dynamics of hydrogen-bond breakage and formation.
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Affiliation(s)
- Paul Brünker
- Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
| | - Luis I Domenianni
- Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
| | - Nico Fleck
- Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
| | - Jörg Lindner
- Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
| | - Olav Schiemann
- Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
| | - Peter Vöhringer
- Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
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8
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Synthesis of copper oxide nanoparticles by chemical and biogenic methods: photocatalytic degradation and in vitro antioxidant activity. ACTA ACUST UNITED AC 2020. [DOI: 10.1007/s41204-020-00078-w] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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9
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Vöhringer P. Vibrations tell the tale. A time-resolved mid-infrared perspective of the photochemistry of iron complexes. Dalton Trans 2020; 49:256-266. [DOI: 10.1039/c9dt04165f] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Time-resolved infrared spectroscopies are used to elucidate multiscalar photochemical processes of iron complexes.
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Affiliation(s)
- Peter Vöhringer
- Abteilung für Molekulare Physikalische Chemie
- Institut für Physikalische und Theoretische Chemie
- Rheinische Friedrich-Wilhelms-Universität
- 53115 Bonn
- Germany
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Ding L, Chen Y, Hua Z, Liu L, Chen H, Zhong Z, Du Y, Huang Y. Preparation of ZnO quantum dots@SiO 2/PVA for multifunctional coating on PET. NEW J CHEM 2020. [DOI: 10.1039/c9nj05774a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A durable, highly transparent and ultraviolet shielded inkjet printing coating was successfully prepared using ZnO QDs@SiO2.
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Affiliation(s)
- Lei Ding
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- P. R. China
| | - YiFan Chen
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- P. R. China
| | - Zibo Hua
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- P. R. China
| | - Li Liu
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- P. R. China
- State Key Laboratory of Advanced Welding and Joining
| | - Haixu Chen
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- P. R. China
| | - Zhengxiang Zhong
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- P. R. China
| | - Yunzhe Du
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- P. R. China
| | - Yudong Huang
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- P. R. China
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11
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Bonde GV, Ajmal G, Yadav SK, Mittal P, Singh J, Bakde BV, Mishra B. Assessing the viability of Soluplus® self-assembled nanocolloids for sustained delivery of highly hydrophobic lapatinib (anticancer agent): Optimisation and in-vitro characterisation. Colloids Surf B Biointerfaces 2020; 185:110611. [DOI: 10.1016/j.colsurfb.2019.110611] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 10/12/2019] [Accepted: 10/23/2019] [Indexed: 12/30/2022]
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12
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Versatile Protein-A Coated Photoelectric Immunosensors with a Purple-Membrane Monolayer Transducer Fabricated by Affinity-Immobilization on a Graphene-Oxide Complexed Linker and by Shear Flow. SENSORS 2018; 18:s18124493. [PMID: 30567418 PMCID: PMC6308460 DOI: 10.3390/s18124493] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2018] [Revised: 12/06/2018] [Accepted: 12/17/2018] [Indexed: 01/22/2023]
Abstract
Bacteriorhodopsin-embedded purple membranes (PM) have been demonstrated to be a sensitive photoelectric transducer for microbial detection. To efficiently prepare versatile BR-based immunosensors with protein A as antibody captures, a large, high-coverage, and uniformly oriented PM monolayer was fabricated on an electrode as an effective foundation for protein A conjugation through bis-NHS esters, by first affinity-coating biotinylated PM on an aminated surface using a complex of oxidized avidin and graphene oxide as the planar linker and then washing the coating with a shear flow. Three different polyclonal antibodies, each against Escherichia coli, Lactobacillus acidophilus, and Streptococcus mutans, respectively, were individually, effectively and readily adsorbed on the protein A coated electrodes, leading to selective and sensitive quantitative detection of their respective target cells in a single step without any labeling. A single-cell detection limit was achieved for the former two cells. AFM, photocurrent, and Raman analyses all displayed each fabricated layer as well as the captured bacteria, with AFM particularly revealing the formation of a massive continuous PM monolayer on aminated mica. The facile cell-membrane monolayer fabrication and membrane surface conjugation techniques disclosed in this study may be widely applied to the preparation of different biomembrane-based biosensors.
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13
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Tran H, Cunha AV, Shephard JJ, Shalit A, Hamm P, Jansen TLC, Salzmann CG. 2D IR spectroscopy of high-pressure phases of ice. J Chem Phys 2017; 147:144501. [DOI: 10.1063/1.4993952] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Halina Tran
- Department of Chemistry, University of Zürich, Zürich, Switzerland
| | - Ana V. Cunha
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Jacob J. Shephard
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Andrey Shalit
- Department of Chemistry, University of Zürich, Zürich, Switzerland
| | - Peter Hamm
- Department of Chemistry, University of Zürich, Zürich, Switzerland
| | - Thomas L. C. Jansen
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Christoph G. Salzmann
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
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14
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De Marco L, Fournier JA, Thämer M, Carpenter W, Tokmakoff A. Anharmonic exciton dynamics and energy dissipation in liquid water from two-dimensional infrared spectroscopy. J Chem Phys 2016; 145:094501. [DOI: 10.1063/1.4961752] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Affiliation(s)
- Luigi De Marco
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA
- Department of Chemistry, James Frank Institute, and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
| | - Joseph A. Fournier
- Department of Chemistry, James Frank Institute, and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
| | - Martin Thämer
- Department of Chemistry, James Frank Institute, and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
| | - William Carpenter
- Department of Chemistry, James Frank Institute, and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
| | - Andrei Tokmakoff
- Department of Chemistry, James Frank Institute, and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
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15
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Fournier JA, Carpenter W, De Marco L, Tokmakoff A. Interplay of Ion–Water and Water–Water Interactions within the Hydration Shells of Nitrate and Carbonate Directly Probed with 2D IR Spectroscopy. J Am Chem Soc 2016; 138:9634-45. [DOI: 10.1021/jacs.6b05122] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Joseph A. Fournier
- Department
of Chemistry, Institute for Biophysical Dynamics, and James Franck
Institute, The University of Chicago, Chicago, Illinois 60637, United States
| | - William Carpenter
- Department
of Chemistry, Institute for Biophysical Dynamics, and James Franck
Institute, The University of Chicago, Chicago, Illinois 60637, United States
| | - Luigi De Marco
- Department
of Chemistry, Institute for Biophysical Dynamics, and James Franck
Institute, The University of Chicago, Chicago, Illinois 60637, United States
- Department
of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Andrei Tokmakoff
- Department
of Chemistry, Institute for Biophysical Dynamics, and James Franck
Institute, The University of Chicago, Chicago, Illinois 60637, United States
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16
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Shinokita K, Cunha AV, Jansen TLC, Pshenichnikov MS. Hydrogen bond dynamics in bulk alcohols. J Chem Phys 2016; 142:212450. [PMID: 26049470 DOI: 10.1063/1.4921574] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Hydrogen-bonded liquids play a significant role in numerous chemical and biological phenomena. In the past decade, impressive developments in multidimensional vibrational spectroscopy and combined molecular dynamics-quantum mechanical simulation have established many intriguing features of hydrogen bond dynamics in one of the fundamental solvents in nature, water. The next class of a hydrogen-bonded liquid--alcohols--has attracted much less attention. This is surprising given such important differences between water and alcohols as the imbalance between the number of hydrogen bonds, each molecule can accept (two) and donate (one) and the very presence of the hydrophobic group in alcohols. Here, we use polarization-resolved pump-probe and 2D infrared spectroscopy supported by extensive theoretical modeling to investigate hydrogen bond dynamics in methanol, ethanol, and isopropanol employing the OH stretching mode as a reporter. The sub-ps dynamics in alcohols are similar to those in water as they are determined by similar librational and hydrogen-bond stretch motions. However, lower density of hydrogen bond acceptors and donors in alcohols leads to the appearance of slow diffusion-controlled hydrogen bond exchange dynamics, which are essentially absent in water. We anticipate that the findings herein would have a potential impact on fundamental chemistry and biology as many processes in nature involve the interplay of hydrophobic and hydrophilic groups.
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Affiliation(s)
- Keisuke Shinokita
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Ana V Cunha
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Thomas L C Jansen
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Maxim S Pshenichnikov
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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17
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Shaw DJ, Adamczyk K, Frederix PWJM, Simpson N, Robb K, Greetham GM, Towrie M, Parker AW, Hoskisson PA, Hunt NT. Multidimensional infrared spectroscopy reveals the vibrational and solvation dynamics of isoniazid. J Chem Phys 2015; 142:212401. [DOI: 10.1063/1.4914097] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
- Daniel J. Shaw
- Department of Physics, University of Strathclyde, SUPA, 107 Rottenrow East, Glasgow G4 0NG, United Kingdom
- Strathclyde Institute for Pharmacy and Biomedical Sciences (SIPBS), University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, United Kingdom
| | - Katrin Adamczyk
- Department of Physics, University of Strathclyde, SUPA, 107 Rottenrow East, Glasgow G4 0NG, United Kingdom
| | - Pim W. J. M. Frederix
- Department of Physics, University of Strathclyde, SUPA, 107 Rottenrow East, Glasgow G4 0NG, United Kingdom
| | - Niall Simpson
- Department of Physics, University of Strathclyde, SUPA, 107 Rottenrow East, Glasgow G4 0NG, United Kingdom
| | - Kirsty Robb
- Strathclyde Institute for Pharmacy and Biomedical Sciences (SIPBS), University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, United Kingdom
| | - Gregory M. Greetham
- STFC Rutherford Appleton Laboratory, Central Laser Facility, Research Complex at Harwell, Didcot OX11 0QX, United Kingdom
| | - Michael Towrie
- STFC Rutherford Appleton Laboratory, Central Laser Facility, Research Complex at Harwell, Didcot OX11 0QX, United Kingdom
| | - Anthony W. Parker
- STFC Rutherford Appleton Laboratory, Central Laser Facility, Research Complex at Harwell, Didcot OX11 0QX, United Kingdom
| | - Paul A. Hoskisson
- Strathclyde Institute for Pharmacy and Biomedical Sciences (SIPBS), University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, United Kingdom
| | - Neil T. Hunt
- Department of Physics, University of Strathclyde, SUPA, 107 Rottenrow East, Glasgow G4 0NG, United Kingdom
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18
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Rudko GY, Kovalchuk AO, Fediv VI, Chen WM, Buyanova IA. Interfacial bonding in a CdS/PVA nanocomposite: A Raman scattering study. J Colloid Interface Sci 2015; 452:33-37. [PMID: 25910224 DOI: 10.1016/j.jcis.2015.04.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 03/29/2015] [Accepted: 04/03/2015] [Indexed: 10/23/2022]
Abstract
Raman spectroscopy is employed to characterize the bonding between CdS nanoparticles (NPs) and a polyvinyl alcohol (PVA) as well as structural changes in the polymeric matrix caused by incorporation of NPs. It is shown that after the formation of CdS NPs the vibrations of carbonyl groups in acetate residuals of PVA and of C-O groups at the macromolecules ends disappear. Formation of NPs also leads to an increased degree of hydrogen bonding and crystallinity of the hybrid material as compared with the unloaded polymer. The observed changes are ascribed to the formation of coordinative bonds and hydrogen between the CdS nanoparticles and polymeric macromolecules. The scheme of this interfacial bonding is also proposed.
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Affiliation(s)
- Galyna Yu Rudko
- V. Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kiev 03028, Ukraine
| | - Andrii O Kovalchuk
- V. Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kiev 03028, Ukraine.
| | - Volodymyr I Fediv
- Department of Biophysics and Medical Informatics, Bukovinian State Medical University, 42 Kobylyanska st., 58000 Chernivtsi, Ukraine
| | - Weimin M Chen
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
| | - Irina A Buyanova
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
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19
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De Marco L, Thämer M, Reppert M, Tokmakoff A. Direct observation of intermolecular interactions mediated by hydrogen bonding. J Chem Phys 2014; 141:034502. [DOI: 10.1063/1.4885145] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Luigi De Marco
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA
- Department of Chemistry, James Frank Institute and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
| | - Martin Thämer
- Department of Chemistry, James Frank Institute and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
| | - Mike Reppert
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA
- Department of Chemistry, James Frank Institute and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
| | - Andrei Tokmakoff
- Department of Chemistry, James Frank Institute and The Institute for Biophysical Dynamics, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, USA
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20
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van der Vegte CP, Knop S, Vöhringer P, Knoester J, Jansen TLC. OH-stretching in synthetic hydrogen-bonded chains. J Phys Chem B 2014; 118:6256-64. [PMID: 24820546 DOI: 10.1021/jp504267h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We study hydrogen bond dynamics in stereoselectively synthesized polyalcohols by combining linear and two-dimensional (2D) infrared spectroscopy experiments with simulations. We consider two variants of the polyalcohols: the all-syn and all-anti tetrol, which because of their different stereochemistry of the hydroxyl groups form a linear hydrogen-bonded chain that is stable for tens of picoseconds or a system where hydrogen bonds are formed and broken on a picosecond timescale, respectively. The differences in structure and hydrogen bond dynamics gives rise to significant differences in the linear spectra for the two compounds. Furthermore, we show that the stronger hydrogen bonding for the all-syn variant leads to faster fluctuations of the site frequencies than for the all-anti one, which is reflected in the higher degree of homogeneous broadening in the 2D spectra. Because of the different stereochemistry, the coupling in the all-syn molecule is stronger than for the all-anti one, which leads to a faster delocalization of a local excitation. This explains the previously observed pump-frequency independent vibrational lifetime for the all-syn variant, since the excitation loses the memory of the pump frequency before relaxation. For the all-anti form, the coupling is weak and the excitation remains in the initially excited state, maintaining the memory of the pump frequency.
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Affiliation(s)
- C P van der Vegte
- Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
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21
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Cai K, Su T, Lin S, Zheng R. Molecular mechanics force field-based general map for the solvation effect on amide I probe of peptide in different micro-environments. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 117:548-556. [PMID: 24036186 DOI: 10.1016/j.saa.2013.08.058] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 08/01/2013] [Accepted: 08/14/2013] [Indexed: 06/02/2023]
Abstract
A general electrostatic potential map based on molecular mechanics force field for modeling the amide I frequency is presented. This map is applied to N-methylacetamide (NMA) and designed to be transferable in different micro-environments. The electrostatic potentials from solvent and peptide side chain are projected on the amide unit of NMA to induce the frequency shift of amide I mode. It is shown that the predicted amide I frequency reproduces the experimental data satisfactorily, especially when NMA in polar solvents. The amide I frequency shift is largely determined by the solvents in aqueous solution while it is dominated by the local structure of peptide in other solvent environments. The map parameters are further applied on NMA-MeOH system and the obtained IR spectra show doublet peak profile with negligible deviation from the experimental data, suggesting the usefulness of this general map for providing information about vibrational parameters of amide motions of peptide in different environments.
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Affiliation(s)
- Kaicong Cai
- College of Chemistry and Chemical Engineering, Fujian Normal University, Fuzhou 350007, Fujian, PR China.
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22
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Kwac K, Geva E. A Mixed Quantum-Classical Molecular Dynamics Study of anti-Tetrol and syn-Tetrol Dissolved in Liquid Chloroform: Hydrogen-Bond Structure and Its Signature on the Infrared Absorption Spectrum. J Phys Chem B 2013; 117:16493-505. [DOI: 10.1021/jp4080724] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Kijeong Kwac
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Eitan Geva
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
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23
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Kwac K, Geva E. A Mixed Quantum-Classical Molecular Dynamics Study of anti-Tetrol and syn-Tetrol Dissolved in Liquid Chloroform II: Infrared Emission Spectra, Vibrational Excited-State Lifetimes, and Nonequilibrium Hydrogen-Bond Dynamics. J Phys Chem B 2013; 117:14457-67. [DOI: 10.1021/jp408580n] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kijeong Kwac
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Eitan Geva
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
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24
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Politano A, Chiarello G. The nature of free O-H stretching in water adsorbed on carbon nanosystems. J Chem Phys 2013; 139:064704. [DOI: 10.1063/1.4817681] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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25
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Olschewski M, Knop S, Lindner J, Vöhringer P. From Single Hydrogen Bonds to Extended Hydrogen-Bond Wires: Low-Dimensional Model Systems for Vibrational Spectroscopy of Associated Liquids. Angew Chem Int Ed Engl 2013; 52:9634-54. [DOI: 10.1002/anie.201210009] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Indexed: 11/06/2022]
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26
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Olschewski M, Knop S, Lindner J, Vöhringer P. Von einzelnen H-Brücken zu ausgedehnten H-verbrückten Drähten: niederdimensionale Modellsysteme für die Schwingungsspektroskopie vernetzter Flüssigkeiten. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201210009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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De Marco L, Ramasesha K, Tokmakoff A. Experimental evidence of Fermi resonances in isotopically dilute water from ultrafast broadband IR spectroscopy. J Phys Chem B 2013; 117:15319-27. [PMID: 23638966 DOI: 10.1021/jp4034613] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The vibrational dynamics of liquid water, which result from a complex interplay between internal molecular vibrations and the fluctuating hydrogen bond network, are fundamental to many physicochemical and biological processes. Using a new ultrafast broadband mid-infrared light source with over 2000 cm(-1) of bandwidth, we performed ultrafast time-resolved infrared spectroscopy to study the vibrational couplings and relaxation dynamics of the stretching and bending vibrations of the mixed isotopologue, HOD, in D2O. Analysis of cross-peaks and induced absorptions in the two-dimensional infrared spectrum and transient absorption spectrum shows that the hydroxyl stretch of HOD is coupled to the HOD bending mode via Fermi resonance, with a 70° angle between their transition dipole moments. We see that HOD is also anharmonically coupled to the D2O solvent modes. From transient absorption spectra, we conclude that vibrational relaxation occurs through a number of paths. The strongly hydrogen-bonded OH oscillators have the highest propensity to relax through the bending mode, while the weakly hydrogen bonded oscillators relax through other modes.
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Affiliation(s)
- Luigi De Marco
- Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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28
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Knop S, Olschewski M, Vöhringer P. Femtosecond two-dimensional infrared spectroscopy of synthetic hydrogen-bonded wires: From homogeneous to inhomogeneous dynamics. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134106001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Sun YQ, Deng S, Liu Q, Ge SZ, Chen YP. A green luminescent 1-D helical tubular dipyrazol-bridged cadmium(ii) complex: a coordination tube included in a supramolecular tube. Dalton Trans 2013; 42:10503-9. [DOI: 10.1039/c3dt50620g] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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30
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Yang M. Time-averaging approximation in the interaction picture: Anisotropy of vibrational pump-probe experiments for coupled chromophores with application to liquid water. J Chem Phys 2012; 137:154102. [DOI: 10.1063/1.4758453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Greve C, Preketes NK, Costard R, Koeppe B, Fidder H, Nibbering ETJ, Temps F, Mukamel S, Elsaesser T. N-H stretching modes of adenosine monomer in solution studied by ultrafast nonlinear infrared spectroscopy and ab initio calculations. J Phys Chem A 2012; 116:7636-44. [PMID: 22724894 PMCID: PMC3441835 DOI: 10.1021/jp303864m] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The N-H stretching vibrations of adenine, one of the building blocks of DNA, are studied by combining infrared absorption and nonlinear two-dimensional infrared spectroscopy with ab initio calculations. We determine diagonal and off-diagonal anharmonicities of N-H stretching vibrations in chemically modified adenosine monomer dissolved in chloroform. For the single-quantum excitation manifold, the normal mode picture with symmetric and asymmetric NH(2) stretching vibrations is fully appropriate. For the two-quantum excitation manifold, however, the interplay between intermode coupling and frequency shifts due to a large diagonal anharmonicity leads to a situation where strong mixing does not occur. We compare our findings with previously reported values obtained on overtone spectroscopy of coupled hydrogen stretching oscillators.
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Affiliation(s)
- Christian Greve
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2 A, D-12489 Berlin, Germany
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32
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Yang M, Skinner JL. Time-averaging approximation in the interaction picture: absorption line shapes for coupled chromophores with application to liquid water. J Chem Phys 2012; 135:154114. [PMID: 22029304 DOI: 10.1063/1.3654005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The time-averaging approximation (TAA), originally developed to calculate vibrational line shapes for coupled chromophores using mixed quantum/classical methods, is reformulated. In the original version of the theory, time averaging was performed for the full one-exciton Hamiltonian, while herein the time averaging is performed on the coupling (off-diagonal) Hamiltonian in the interaction picture. As a result, the influence of the dynamic fluctuations of the transition energies is more accurately described. We compare numerical results of the two versions of the TAA with numerically exact results for the vibrational absorption line shape of the OH stretching modes in neat water. It is shown that the TAA in the interaction picture yields theoretical line shapes that are in better agreement with exact results.
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Affiliation(s)
- Mino Yang
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea.
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33
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Knop S, Lindner J, Vöhringer P. OH and NH Stretching Vibrational Relaxation of Liquid Ethanolamine. ACTA ACUST UNITED AC 2011. [DOI: 10.1524/zpch.2011.0125] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Femtosecond mid-infrared pump-probe spectroscopy was carried out to obtain information about the dynamics of vibrational energy relaxation in liquid ethanolamine at room temperature and ambient pressure. Through partial deuteration it was possible to disentangle the dynamics resulting from the OH and the NH stretching modes that proceed independently and simultaneously in the hydrogen-bonded liquid following an ultrafast vibrational excitation by a resonant mid-infrared pulse. The OH-stretching vibrational lifetime was determined to be 450 fs while the NH-stretching lifetime was found to be 1.2 ps. This large difference in lifetimes highlights the importance of the hydrogen-donating and the hydrogen-accepting character of the vibrating groups that are engaged in hydrogen-bonding.
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Affiliation(s)
- Stephan Knop
- Rheinische Friedrich-Wilhelms-Universität Bonn, Lehrstuhl für Molekulare Physikalische Chemie, Bonn, Deutschland
| | - Jörg Lindner
- Rheinische Friedrich-Wilhelms-Universität Bonn, Lehrstuhl für Molekulare Physikalische Chemie, Bonn, Deutschland
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