1
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Fernandes RS, Kumari J, Sriram D, Dey N. Fluorescent Nanoassembly of Tetrazole-Based Dyes with Amphoteric Surfactants: Investigation of Cyanide Sensing and Antitubercular Activity. ACS APPLIED BIO MATERIALS 2023; 6:4158-4167. [PMID: 37737110 DOI: 10.1021/acsabm.3c00357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
Tetrazole-based easily synthesizable fluorogenic probes have been developed that can form self-assembled nanostructures in the aqueous medium. Though the compounds could achieve detection of cyanide ions in apolar solvents, such as, THF, significant interference was observed from other basic anions, such as F-, AcO-, H2PO4-, etc. On the other hand, a highly specific response was observed for CN- ions in the aqueous medium. However, the sensitivity was so poor that it could hardly be useful for real-life sample analysis. Interestingly, the co-assembly of such probe molecules with hydroxyethyl-anchored amphoteric surfactants could drastically improve the sensitivity toward CN- ions in water without dampening their excellent selectivity. Also, it was observed that the degree of fluorescence response for CN- ions depends on the nature of the polyaromatic scaffolds (naphthyl vs anthracenyl), the nature of the surfactant assembly (micelle vs vesicle), etc. The mechanistic investigation indicates the hydrogen bonding interaction between the tetrazole -NH group and cyanide ions in the aqueous medium, which can effectively change the electronics of the tetrazole unit, resulting in alteration in the extent of charge transfer interaction. Then, the biocompatible composite materials (dye-surfactant assemblies at different ratios) were tested for antituberculosis activity. Fortunately, in a few cases, the compositions were found to be as effective as the commercially available antituberculosis drug, ethambutol.
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Affiliation(s)
- Rikitha S Fernandes
- Department of Chemistry, BITS-Pilani Hyderabad Campus, Hyderabad 500078, India
| | - Jyothi Kumari
- Department of Pharmacy, BITS-Pilani Hyderabad Campus, Hyderabad 500078, India
| | - Dharmarajan Sriram
- Department of Pharmacy, BITS-Pilani Hyderabad Campus, Hyderabad 500078, India
| | - Nilanjan Dey
- Department of Chemistry, BITS-Pilani Hyderabad Campus, Hyderabad 500078, India
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2
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Özönder Ş, Ünlü C, Güleryüz C, Trabzon L. Doped Graphene Quantum Dots UV-vis Absorption Spectrum: A High-Throughput TDDFT Study. ACS OMEGA 2023; 8:2112-2118. [PMID: 36687068 PMCID: PMC9850463 DOI: 10.1021/acsomega.2c06091] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
We report on time-dependent density functional theory calculations of the excited states of 63 different graphene quantum dots (GQDs) in square shape with side lengths of 1, 1.5, and 2 nm. We investigate the systematics and trends in the UV-vis absorption spectra of these GQDs, which are doped with elements B, N, O, S, and P at dopant percentages of 1.5%, 3%, 5%, and 7%. The results show how the peaks in the UV and visible parts of the spectrum as well as the total absorption evolve in the chemical parameter space along the coordinates of size, dopant type, and dopant percentage. The absorption spectra calculated here can be used to obtain particular GQD mixture proportions that would yield a desired absorption profile such as flat absorption across the whole visible spectrum or one that is locally peaked around a chosen wavelength.
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Affiliation(s)
- Şener Özönder
- Institute
for Data Science & Artificial Intelligence, Boğaziçi University, Istanbul 34342, Turkey
| | - Caner Ünlü
- Department
of Chemistry, Istanbul Technical University, Istanbul 34469, Turkey
| | - Cihat Güleryüz
- Department
of Physics, Marmara University, Istanbul 34722, Turkey
- Department
of Opticianry, Altınbaş University, Istanbul 34217, Turkey
| | - Levent Trabzon
- Department
of Mechanical Engineering, Istanbul Technical
University, Istanbul 34469, Turkey
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3
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Lao G, Zhu GZ, Dickerson CE, Augenbraun BL, Alexandrova AN, Caram JR, Hudson ER, Campbell WC. Laser Spectroscopy of Aromatic Molecules with Optical Cycling Centers: Strontium(I) Phenoxides. J Phys Chem Lett 2022; 13:11029-11035. [PMID: 36413655 PMCID: PMC9720742 DOI: 10.1021/acs.jpclett.2c03040] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 11/15/2022] [Indexed: 06/16/2023]
Abstract
We report the production and spectroscopic characterization of strontium(I) phenoxide (SrOC6H5 or SrOPh) and variants featuring electron-withdrawing groups designed to suppress vibrational excitation during spontaneous emission from the electronically excited state. Optical cycling closure of these species, which is the decoupling of the vibrational state changes from spontaneous optical decay, is found by dispersed laser-induced fluorescence spectroscopy to be high, in accordance with theoretical predictions. A high-resolution, rotationally resolved laser excitation spectrum is recorded for SrOPh, allowing the estimation of spectroscopic constants and identification of candidate optical cycling transitions for future work. The results confirm the promise of strontium phenoxides for laser cooling and quantum state detection at the single-molecule level.
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Affiliation(s)
- Guanming Lao
- Department
of Physics & Astronomy, University of
California Los Angeles, Los Angeles, California90095, United States
| | - Guo-Zhu Zhu
- Department
of Physics & Astronomy, University of
California Los Angeles, Los Angeles, California90095, United States
| | - Claire E. Dickerson
- Department
of Chemistry & Biochemistry, University
of California Los Angeles, Los
Angeles, California90095, United States
| | - Benjamin L. Augenbraun
- Department
of Physics, Harvard University, Cambridge, Massachusetts02138, United States
- Harvard-MIT
Center for Ultracold Atoms, Cambridge, Massachusetts02138, United States
| | - Anastassia N. Alexandrova
- Department
of Chemistry & Biochemistry, University
of California Los Angeles, Los
Angeles, California90095, United States
- Center
for Quantum Science and Engineering, University
of California, Los Angeles, California90095, United States
| | - Justin R. Caram
- Department
of Chemistry & Biochemistry, University
of California Los Angeles, Los
Angeles, California90095, United States
- Center
for Quantum Science and Engineering, University
of California, Los Angeles, California90095, United States
| | - Eric R. Hudson
- Department
of Physics & Astronomy, University of
California Los Angeles, Los Angeles, California90095, United States
- Center
for Quantum Science and Engineering, University
of California, Los Angeles, California90095, United States
- Challenge
Institute for Quantum Computation, University
of California, Los Angeles, California90095, United States
| | - Wesley C. Campbell
- Department
of Physics & Astronomy, University of
California Los Angeles, Los Angeles, California90095, United States
- Center
for Quantum Science and Engineering, University
of California, Los Angeles, California90095, United States
- Challenge
Institute for Quantum Computation, University
of California, Los Angeles, California90095, United States
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4
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Sülzner N, Hättig C. Theoretical Study on the Photoacidity of Hydroxypyrene Derivatives in DMSO Using ADC(2) and CC2. J Phys Chem A 2022; 126:5911-5923. [PMID: 36037028 DOI: 10.1021/acs.jpca.2c04436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work applies the thermodynamic Förster cycle to theoretically investigate the pKa*, i.e., excited-state pKa values of pyranine-derived superphotoacids developed by Jung and co-workers. The latter photoacids are strong enough to transfer a proton to the aprotic solvent dimethyl sulfoxide (DMSO). The Förster cycle provides access to pKa* via the ground-state pKa and the electronic excitation energies. We use the conductor-like screening model for real solvents (COSMO-RS) to compute the ground-state pKa and the correlated wavefunction-based methods ADC(2) and CC2 with the continuum solvation model COSMO to calculate the pKa change upon excitation. A comparison of the calculated UV/Vis absorption and fluorescence emission energies to the experimental results leads us to infer that this approach allows for a proper description of the electronic excitations. In particular, implicit solvation by means of the COSMO model appears to be sufficient for the treatment of these photoacids in DMSO. The calculations confirm the presumption that a charge redistribution from the hydroxy group to the aromatic ring and the electron-withdrawing substituents is the origin of photoacidity for these photoacids. Moreover, the calculations with the continuum solvation model predict that the pKa jump upon excitation decreases with increasing solvent polarity, as rationalized based on the Förster cycle.
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Affiliation(s)
- Niklas Sülzner
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Christof Hättig
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
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5
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Ghosh P, Nandy T, Singh PC, Ghosh D. Substitution enables significant new decay channels for a non-canonical amino acid. Phys Chem Chem Phys 2022; 24:17695-17702. [PMID: 35838114 DOI: 10.1039/d2cp00465h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
UV-Vis absorption spectra and emission peaks of indole and 7-fluoroindole are measured and it is observed that 7-fluoroindole quenches the fluorescence signals significantly compared to indole. This observation is elucidated via reconstruction of the potential energy surfaces, determination of the conical intersections, and dynamical studies. It is observed that a single fluorine substitution on indole leads to the appearance of several accessible low-energy conical intersections that cause fast nonradiative decay. In this paper, we have investigated the nonradiative processes of Ind and 7F-Ind theoretically using high-level methods, such as EOM-EE-CCSD, SA-CASSCF, MS-CASPT2/6-311++G(d,p) levels of theory, to study these pathways and their feasibility.
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Affiliation(s)
- Paulami Ghosh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India.
| | - Tonima Nandy
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India.
| | - Prashant C Singh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India.
| | - Debashree Ghosh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India.
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6
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López Peña HA, Shusterman JM, Ampadu Boateng D, Lao KU, Tibbetts KM. Coherent Control of Molecular Dissociation by Selective Excitation of Nuclear Wave Packets. Front Chem 2022; 10:859095. [PMID: 35449589 PMCID: PMC9016217 DOI: 10.3389/fchem.2022.859095] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/18/2022] [Indexed: 11/20/2022] Open
Abstract
We report on pump-probe control schemes to manipulate fragmentation product yields in p-nitrotoluene (PNT) cation. Strong field ionization of PNT prepares the parent cation in the ground electronic state, with coherent vibrational excitation along two normal modes: the C–C–N–O torsional mode at 80 cm−1 and the in-plane ring-stretching mode at 650 cm−1. Both vibrational wave packets are observed as oscillations in parent and fragment ion yields in the mass spectrum upon optical excitation. Excitation with 650 nm selectively fragments the PNT cation into C7H7+, whereas excitation with 400 nm selectively produces C5H5+ and C3H3+. In both cases the ion yield oscillations result from torsional wave packet excitation, but 650 and 400 nm excitation produce oscillations with opposite phases. Ab initio calculations of the ground and excited electronic potential energy surfaces of PNT cation along the C–C–N–O dihedral angle reveal that 400 nm excitation accesses an allowed transition from D0 to D6 at 0° dihedral angle, whereas 650 nm excitation accesses a strongly allowed transition from D0 to D4 at a dihedral angle of 90°. This ability to access different electronic excited states at different locations along the potential energy surface accounts for the selective fragmentation observed with different probe wavelengths. The ring-stretching mode, only observed using 800 nm excitation, is attributed to a D0 to D2 transition at a geometry with 90° dihedral angle and elongated C–N bond length. Collectively, these results demonstrate that strong field ionization induces multimode coherent excitation and that the vibrational wave packets can be excited with specific photon energies at different points on their potential energy surfaces to induce selective fragmentation.
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7
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Word MD, López Peña HA, Ampadu Boateng D, McPherson SL, Gutsev GL, Gutsev LG, Lao KU, Tibbetts KM. Ultrafast Dynamics of Nitro-Nitrite Rearrangement and Dissociation in Nitromethane Cation. J Phys Chem A 2022; 126:879-888. [PMID: 35133840 DOI: 10.1021/acs.jpca.1c10288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report new insights into the ultrafast rearrangement and dissociation dynamics of nitromethane cation (NM+) using pump-probe measurements, electronic structure calculations, and ab initio molecular dynamics simulations. The "roaming" nitro-nitrite rearrangement (NNR) pathway involving large-amplitude atomic motion, which has been previously described for neutral nitromethane, is demonstrated for NM+. Excess energy resulting from initial population of the electronically excited D2 state of NM+ upon strong-field ionization provides the necessary energy to initiate NNR and subsequent dissociation into NO+. Both pump-probe measurements and molecular dynamics simulations are consistent with the completion of NNR within 500 fs of ionization with dissociation into NO+ and OCH3 occurring ∼30 fs later. Pump-probe measurements indicate that NO+ formation is in competition with the direct dissociation of NM+ to CH3+ and NO2. Electronic structure calculations indicate that a strong D0 → D1 transition can be excited at 650 nm when the C-N bond is stretched from its equilibrium value (1.48 Å) to 1.88 Å. On the other hand, relaxation of the NM+ cation after ionization into D0 occurs in less than 50 fs and results in observation of intact NM+. Direct dissociation of the equilibrium NM+ to produce NO2+ and CH3 can be induced with 650 nm excitation via a weakly allowed D0 → D2 transition.
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Affiliation(s)
- Mi'Kayla D Word
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Hugo A López Peña
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Derrick Ampadu Boateng
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Shane L McPherson
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Gennady L Gutsev
- Department of Physics, Florida A&M University, Tallahassee, Florida 32307, United States
| | - Lavrenty G Gutsev
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Chernogolovka 142432, Russia
| | - Ka Un Lao
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Katharine Moore Tibbetts
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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8
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Acharya A, Yi D, Pavlova A, Agarwal V, Gumbart JC. Resolving the Hydride Transfer Pathway in Oxidative Conversion of Proline to Pyrrole. Biochemistry 2022; 61:206-215. [DOI: 10.1021/acs.biochem.1c00741] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Atanu Acharya
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Dongqi Yi
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Anna Pavlova
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Vinayak Agarwal
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - James C. Gumbart
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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9
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Minguela-Gallardo JA, Yi JT, Plusquellic DF, Álvarez-Valtierra L. Rotationally resolved electronic S1 spectra of tryptoline and oxindole: Reversal of the 1L and 1L state character. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Mazzeo G, Ghidinelli S, Ruzziconi R, Grandi M, Abbate S, Longhi G. Circularly Polarized Luminescence of Some [2]Paracyclo[2](5,8)quinoliphane Derivatives with Planar and Central Chirality. CHEMPHOTOCHEM 2021. [DOI: 10.1002/cptc.202100222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Giuseppe Mazzeo
- Department of Molecular and Translational Medicine University of Brescia Viale Europa 11 25123 Brescia Italy
| | - Simone Ghidinelli
- Department of Molecular and Translational Medicine University of Brescia Viale Europa 11 25123 Brescia Italy
| | - Renzo Ruzziconi
- Department of Chemistry, Biology and Biotechnologies University of Perugia Viale Elce di Sotto 8 06123 Perugia Italy
| | - Marco Grandi
- Jasco Europe Via Luigi Cadorna, 1 23894 Cremella LC Italy
| | - Sergio Abbate
- Department of Molecular and Translational Medicine University of Brescia Viale Europa 11 25123 Brescia Italy
| | - Giovanna Longhi
- Department of Molecular and Translational Medicine University of Brescia Viale Europa 11 25123 Brescia Italy
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11
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Ghidinelli S, Longhi G, Abbate S, Hättig C, Coriani S. Magnetic Circular Dichroism of Naphthalene Derivatives: A Coupled Cluster Singles and Approximate Doubles and Time-Dependent Density Functional Theory Study. J Phys Chem A 2021; 125:243-250. [PMID: 33355445 DOI: 10.1021/acs.jpca.0c09669] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The UV-vis absorption and magnetic circular dichroism spectra of naphthalene and some of its derivatives have been simulated at the Coupled Cluster Singles and Approximate Doubles (CC2) level of theory, and at the Time-Dependent Density Functional Theory (TD-DFT) level using the B3LYP and CAM-B3LYP functionals. DFT and CC2 predict in general opposite energetic ordering of the Lb and La transitions (in gas phase), as previously observed in adenine. The CC2 simulations of UV and MCD spectra show the best agreement with the experimental data. Analysis of the Cartesian components of the electric dipole transition strengths and the magnetic dipole transition moment between the excited states have been considered in the interpretation of the electronic transitions and the Faraday B term inversion among the naphthalene derivatives.
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Affiliation(s)
- S Ghidinelli
- Department of Molecular and Translational Medicine, Università degli Studi di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - G Longhi
- Department of Molecular and Translational Medicine, Università degli Studi di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - S Abbate
- Department of Molecular and Translational Medicine, Università degli Studi di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - C Hättig
- Arbeitsgruppe Quantenchemie, Ruhr-Universität Bochum, D-44780, Germany
| | - S Coriani
- DTU Chemistry, Technical University of Denmark, Kemitorvet Bldg 207, DK-2800 Kongens Lyngby, Denmark
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12
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López Peña HA, Ampadu Boateng D, McPherson SL, Tibbetts KM. Using computational chemistry to design pump–probe schemes for measuring nitrobenzene radical cation dynamics. Phys Chem Chem Phys 2021; 23:13338-13348. [DOI: 10.1039/d1cp00360g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Computed potential energy surfaces of the nitrobenzene cation predict suitable excitation conditions for enhancing ion yield oscillations in time-resolved measurements.
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13
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Zhang W, Liu J, Jin X, Gu X, Zeng XC, He X, Li H. Quantitative Prediction of Aggregation‐Induced Emission: A Full Quantum Mechanical Approach to the Optical Spectra. Angew Chem Int Ed Engl 2020; 59:11550-11555. [DOI: 10.1002/anie.202003326] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Indexed: 12/23/2022]
Affiliation(s)
- Wei Zhang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China
- Department of Chemistry University of Nebraska Lincoln NE 68588 USA
| | - Jinfeng Liu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China
- Department of Basic Medicine and Clinical Pharmacy China Pharmaceutical University Nanjing 210009 China
| | - Xinsheng Jin
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China
| | - Xinggui Gu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China
| | - Xiao Cheng Zeng
- Department of Chemistry University of Nebraska Lincoln NE 68588 USA
| | - Xiao He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China
- NYU-ECNU Center for Computational Chemistry at NYU Shanghai Shanghai 200062 China
| | - Hui Li
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China
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14
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Zhang W, Liu J, Jin X, Gu X, Zeng XC, He X, Li H. Quantitative Prediction of Aggregation‐Induced Emission: A Full Quantum Mechanical Approach to the Optical Spectra. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003326] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Wei Zhang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China
- Department of Chemistry University of Nebraska Lincoln NE 68588 USA
| | - Jinfeng Liu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China
- Department of Basic Medicine and Clinical Pharmacy China Pharmaceutical University Nanjing 210009 China
| | - Xinsheng Jin
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China
| | - Xinggui Gu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China
| | - Xiao Cheng Zeng
- Department of Chemistry University of Nebraska Lincoln NE 68588 USA
| | - Xiao He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China
- NYU-ECNU Center for Computational Chemistry at NYU Shanghai Shanghai 200062 China
| | - Hui Li
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China
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15
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Kimber P, Plasser F. Toward an understanding of electronic excitation energies beyond the molecular orbital picture. Phys Chem Chem Phys 2020; 22:6058-6080. [DOI: 10.1039/d0cp00369g] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Can we gain an intuitive understanding of excitation energies beyond the molecular picture?
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Affiliation(s)
- Patrick Kimber
- Department of Chemistry
- Loughborough University
- Loughborough
- UK
| | - Felix Plasser
- Department of Chemistry
- Loughborough University
- Loughborough
- UK
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16
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Nelson KJ, Brown PJ, Rudel HE, Takematsu K. Divergent excited state proton transfer reactions of bifunctional photoacids 1-ammonium-2-naphthol and 3-ammonium-2-naphthol in water and methanol. Phys Chem Chem Phys 2019; 21:24383-24392. [PMID: 31663559 DOI: 10.1039/c9cp05269k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper highlights the challenge of predicting the excited state proton transfer (ESPT) reactions of small organic compounds with multiple proton transfer sites. Aminonaphthols, naphthalene compounds with both hydroxyl and amino substituents, can be viewed as a combination of two monoprotic photoacids, naphthol and naphthylammonium. Here, the ESPT reactions of 3-ammonium-2-naphthol (3N2OH) and 1-ammonium-2-naphthol (1N2OH) were studied in water and methanol using a combination of steady-state and time-correlated single-photon counting emission spectroscopy. For 3N2OH, ESPT was observed at the OH site in water but at neither of the sites in methanol; for 1N2OH, ESPT was observed at both the OH and NH3+ sites in water but only at the NH3+ site in methanol. Evidence of ESPT at the NH3+ site is limited for aminonaphthols. The divergent dynamics of 3N2OH and 1N2OH in water and methanol are discussed; dependent on the substitution and solvent, the ESPT reactions were analysed within the frameworks of reference photoacids 2-naphthol and 1-naphthylammonium. The application of crown ether and salt to control the release of select protons in non-aqueous media is also discussed.
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Affiliation(s)
- Kacie J Nelson
- Department of Chemistry, Bowdoin College, Brunswick, ME 04011, USA.
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17
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Suellen C, Freitas RG, Loos PF, Jacquemin D. Cross-Comparisons between Experiment, TD-DFT, CC, and ADC for Transition Energies. J Chem Theory Comput 2019; 15:4581-4590. [DOI: 10.1021/acs.jctc.9b00446] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Cinthia Suellen
- Departamento de Quimica, Laboratorio Computacional de Materiais, Universidade Federal de Mato Grosso, Cuiaba, Mato Grosso 78060, Brazil
| | - Renato Garcia Freitas
- Departamento de Quimica, Laboratorio Computacional de Materiais, Universidade Federal de Mato Grosso, Cuiaba, Mato Grosso 78060, Brazil
| | - Pierre-François Loos
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse, CNRS, UPS, 31062 Cedex 9 Toulouse, France
| | - Denis Jacquemin
- Laboratoire CEISAM—UMR CNRS 6230, Université de Nantes, 2 Rue de la Houssinière, BP 92208, 44322 Cedex 3 Nantes, France
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18
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Aqdas A, Siddique F, Nieman R, Quina FH, Aquino AJA. Photoacidity of the 7-Hydroxyflavylium Cation. Photochem Photobiol 2019; 95:1339-1344. [PMID: 31237349 DOI: 10.1111/php.13139] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 06/14/2019] [Indexed: 11/26/2022]
Abstract
Theoretical descriptions of excited state proton transfer (ESPT) have had various degrees of success. This work presents a theoretical description of the photodissociation of the 7-hydroxyflavylium cation (7-HF), the fundamental chromophoric moiety of anthocyanin natural plant pigments. ESPT of 7-HF is promoted by a significant shift of charge away from the OH group in the first singlet excited state, leading smoothly to the excited conjugate base and a protonated water cluster. Several factors contribute to the consistency of the results of the present study: (1) the theoretical approach (TD-DFT with the B3-LYP functional and def2-TZVP basis set utilizing Grimme's D3 dispersion correction); (2) the modeling of the solvent effect combining hydrogen bonding of the photoacid to a cluster of discrete water molecules in a water-like continuum solvent (COSMO); (3) the large S1 -S2 energy gap of flavylium cations; and (4) the electrostatics of the ESPT in which a proton is transferred from a cationic photoacid to water without Coulombic interaction between the proton and the conjugate base.
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Affiliation(s)
- Amna Aqdas
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Farhan Siddique
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Reed Nieman
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX
| | - Frank H Quina
- Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Adelia J A Aquino
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China.,Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX
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19
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Chaudhuri S, Acharya A, Nibbering ETJ, Batista VS. Regioselective Ultrafast Photoinduced Electron Transfer from Naphthols to Halocarbon Solvents. J Phys Chem Lett 2019; 10:2657-2662. [PMID: 31051077 DOI: 10.1021/acs.jpclett.9b00410] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Excited state decay of 2-naphthol (2N) in halocarbon solvents has been observed to be significantly slower when compared to that of 1-naphthol (1N). In this study, we provide new physical insights behind this observation by exploring the regioselective electron transfer (ET) mechanism from photoexcited 1N and 2N to halocarbon solvents at a detailed molecular level. Using state-of-the-art electronic structure calculations, we explore several configurations of naphthol-chloroform complexes and find that the proximity of the electron-accepting chloroform molecule to the electron-rich -OH group of the naphthol is the dominant factor affecting electron transfer rates. The origin of significantly slower electron transfer rates for 2N is traced back to the notably smaller electronic coupling when the electron-accepting chloroform molecule is on top of the aromatic ring distal to the -OH group. Our findings suggest that regioselective photoinduced electron transfer could thus be exploited to control electron transfer in substituted acenes tailored for specific applications.
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Affiliation(s)
- Subhajyoti Chaudhuri
- Department of Chemistry , Yale University , P.O. Box 208107, New Haven , Connecticut 06520 , United States
| | - Atanu Acharya
- Department of Chemistry , Yale University , P.O. Box 208107, New Haven , Connecticut 06520 , United States
| | - Erik T J Nibbering
- Max Born Institut für Nichtlineare Optik and Kurzzeitspektroskopie , Max Born Strasse 2A , 12489 Berlin , Germany
| | - Victor S Batista
- Department of Chemistry , Yale University , P.O. Box 208107, New Haven , Connecticut 06520 , United States
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20
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Cotter LF, Brown PJ, Nelson RC, Takematsu K. Divergent Hammett Plots of the Ground- and Excited-State Proton Transfer Reactions of 7-Substituted-2-Naphthol Compounds. J Phys Chem B 2019; 123:4301-4310. [PMID: 31021637 DOI: 10.1021/acs.jpcb.9b01295] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The rational design of photoacids requires accessible predictive models of the electronic effect of functional groups on chemical templates of interest. Here, the effect of substituents on the photoacidity and excited-state proton transfer (PT) pathways of prototype 2-naphthol (2OH) at the symmetric C7 position was investigated through photochemical and computational studies of 7-amino-2-naphthol (7N2OH) and 7-methoxy-2-naphthol (7OMe2OH). Time-resolved emission experiments of 7N2OH revealed that the presence of an electron-withdrawing versus electron-donating group (EWG vs EDG, NH3+ vs NH2) led to a drastic decline in photoacidity: p Ka* = 1.1 ± 0.2 vs 9.6 ± 0.2. Time-dependent density functional theory calculations with explicit water molecules confirmed that the excited neutral state (x = NH2) is greatly stabilized by water, with equation-of-motion coupled cluster singles and doubles calculations supporting potential mixing between the La and Lb states. Similar suppression of photoacidity, however, was not observed for 7OMe2OH with EDG OCH3, p Ka* = 2.7 ± 0.1. Hammett plots of the ground- and excited-state PT reactions of substituted 7-x-2OH compounds (x = CN, NH3+, H, CH3, OCH3, OH, and NH2) vs Hammett parameters σp showed breaks in the linearity between the EDG and EWG regions: ρ ∼ 0 vs 1.14 and ρ* ∼ 0 vs 3.86. The divergent acidic behavior most likely arises from different mixing mechanisms of the lowest Lb state with the La and possible Bb states upon substitution of naphthalene in water.
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Affiliation(s)
- Laura F Cotter
- Department of Chemistry , Bowdoin College , Brunswick , Maine 04011 , United States
| | - Paige J Brown
- Department of Chemistry , Bowdoin College , Brunswick , Maine 04011 , United States
| | - Ryan C Nelson
- Department of Chemistry , Bowdoin College , Brunswick , Maine 04011 , United States
| | - Kana Takematsu
- Department of Chemistry , Bowdoin College , Brunswick , Maine 04011 , United States
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21
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Strada A, Fredditori M, Zanoni G, Protti S. Acid Catalyzed Formation of C⁻C and C⁻S Bonds via Excited State Proton Transfer. Molecules 2019; 24:molecules24071318. [PMID: 30987238 PMCID: PMC6480163 DOI: 10.3390/molecules24071318] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 03/28/2019] [Accepted: 03/28/2019] [Indexed: 12/13/2022] Open
Abstract
The behavior of 2-naphthol and 7-bromo-2-naphthol as organic photoacids are exploited in organic synthesis for the preparation of benzyl sulfides (using a trichloroacetimidate derivative as the starting substrate) and polycyclic amines via acid catalyzed condensation of 1,2,3,4-tetrahydroisoquinoline with aldehydes.
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Affiliation(s)
- Alessandro Strada
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy.
| | - Mattia Fredditori
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy.
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy.
| | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy.
| | - Stefano Protti
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy.
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22
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Assessment of Ab Initio and Density Functional Theory Methods for the Excitations of Donor-Acceptor Complexes: The Case of the Benzene-Tetracyanoethylene Model. Int J Mol Sci 2018; 19:ijms19041134. [PMID: 29642604 PMCID: PMC5979477 DOI: 10.3390/ijms19041134] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 03/16/2018] [Accepted: 03/20/2018] [Indexed: 12/27/2022] Open
Abstract
The understanding of the excited-state properties of electron donors, acceptors and their interfaces in organic optoelectronic devices is a fundamental issue for their performance optimization. In order to obtain a balanced description of the different excitation types for electron-donor-acceptor systems, including the singlet charge transfer (CT), local excitations, and triplet excited states, several ab initio and density functional theory (DFT) methods for excited-state calculations were evaluated based upon the selected model system of benzene-tetracyanoethylene (B-TCNE) complexes. On the basis of benchmark calculations of the equation-of-motion coupled-cluster with single and double excitations method, the arithmetic mean of the absolute errors and standard errors of the electronic excitation energies for the different computational methods suggest that the M11 functional in DFT is superior to the other tested DFT functionals, and time-dependent DFT (TDDFT) with the Tamm–Dancoff approximation improves the accuracy of the calculated excitation energies relative to that of the full TDDFT. The performance of the M11 functional underlines the importance of kinetic energy density, spin-density gradient, and range separation in the development of novel DFT functionals. According to the TDDFT results, the performances of the different TDDFT methods on the CT properties of the B-TCNE complexes were also analyzed.
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Groves MS, Nelson KJ, Nelson RC, Takematsu K. pH switch for OH-photoacidity in 5-amino-2-naphthol and 8-amino-2-naphthol. Phys Chem Chem Phys 2018; 20:21325-21333. [DOI: 10.1039/c8cp03984d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
pH switch for OH-photoacidity in 5-amino-2-naphthol and 8-amino-2-naphthol Switching of the amino protonation state turns on and off the OH-photoacidity.
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24
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Peng HL. Why does 4-biphenyl carbonyl azide have ultra-short lived excited states? An ultrafast UV-vis spectroscopic and computational study. Phys Chem Chem Phys 2018; 20:29091-29104. [DOI: 10.1039/c8cp05963b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new model is presented for ultrashort-lived excited states of carbonyl azides, their solvent dependence and other experimental observations.
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Affiliation(s)
- Huo-Lei Peng
- Department of Chemistry
- The Ohio State University
- Columbus
- USA
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