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Tok GC, Reiter S, Freiberg ATS, Reinschlüssel L, Gasteiger HA, de Vivie-Riedle R, Hess CR. H 2 Evolution from Electrocatalysts with Redox-Active Ligands: Mechanistic Insights from Theory and Experiment vis-à-vis Co-Mabiq. Inorg Chem 2021; 60:13888-13902. [PMID: 34297556 DOI: 10.1021/acs.inorgchem.1c01157] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electrocatalytic hydrogen production via transition metal complexes offers a promising approach for chemical energy storage. Optimal platforms to effectively control the proton and electron transfer steps en route to H2 evolution still need to be established, and redox-active ligands could play an important role in this context. In this study, we explore the role of the redox-active Mabiq (Mabiq = 2-4:6-8-bis(3,3,4,4-tetramethlyldihydropyrrolo)-10-15-(2,2-biquinazolino)-[15]-1,3,5,8,10,14-hexaene1,3,7,9,11,14-N6) ligand in the hydrogen evolution reaction (HER). Using spectro-electrochemical studies in conjunction with quantum chemical calculations, we identified two precatalytic intermediates formed upon the addition of two electrons and one proton to [CoII(Mabiq)(THF)](PF6) (CoMbq). We further examined the acid strength effect on the generation of the intermediates. The generation of the first intermediate, CoMbq-H1, involves proton addition to the bridging imine-nitrogen atom of the ligand and requires strong proton activity. The second intermediate, CoMbq-H2, acquires a proton at the diketiminate carbon for which a weaker proton activity is sufficient. We propose two decoupled H2 evolution pathways based on these two intermediates, which operate at different overpotentials. Our results show how the various protonation sites of the redox-active Mabiq ligand affect the energies and activities of HER intermediates.
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Affiliation(s)
- G Ceren Tok
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Sebastian Reiter
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 München, Germany
| | - Anna T S Freiberg
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Leonhard Reinschlüssel
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Hubert A Gasteiger
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Regina de Vivie-Riedle
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 München, Germany
| | - Corinna R Hess
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
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2
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Pucelik B, Sułek A, Dąbrowski JM. Bacteriochlorins and their metal complexes as NIR-absorbing photosensitizers: properties, mechanisms, and applications. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213340] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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3
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Forging New Antibiotic Combinations under Iron-Limiting Conditions. Antimicrob Agents Chemother 2020; 64:AAC.01909-19. [PMID: 31907180 DOI: 10.1128/aac.01909-19] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 12/23/2019] [Indexed: 11/20/2022] Open
Abstract
Pseudomonas aeruginosa is a multidrug-resistant nosocomial pathogen. We showed previously that thiostrepton (TS), a Gram-positive thiopeptide antibiotic, is imported via pyoverdine receptors and synergizes with iron chelator deferasirox (DSX) to inhibit the growth of P. aeruginosa and Acinetobacter baumannii clinical isolates. A small number of P. aeruginosa and A. baumannii isolates were resistant to the combination, prompting us to search for other compounds that could synergize with TS against those strains. From literature surveys, we selected 14 compounds reported to have iron-chelating activity, plus one iron analogue, and tested them for synergy with TS. Doxycycline (DOXY), ciclopirox olamine (CO), tropolone (TRO), clioquinol (CLI), and gallium nitrate (GN) synergized with TS. Individual compounds were bacteriostatic, but the combinations were bactericidal. Our spectrophotometric data and chrome azurol S agar assay confirmed that the chelators potentiate TS activity through iron sequestration rather than through their innate antimicrobial activities. A triple combination of TS plus DSX plus DOXY had the most potent activity against P. aeruginosa and A. baumannii isolates. One P. aeruginosa clinical isolate was resistant to the triple combination but susceptible to a triple combination containing higher concentrations of CLI, CO, or DOXY. All A. baumannii isolates were susceptible to the triple combinations. Our data reveal a diverse set of compounds with dual activity as antibacterial agents and TS adjuvants, allowing combinations to be tailored for resistant clinical isolates.
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Kumar R, Katari M, Choudhary A, Rajaraman G, Ghosh P. Computational Insight Into the Hydroamination of an Activated Olefin, As Catalyzed by a 1,2,4-Triazole-Derived Nickel(II) N-Heterocyclic Carbene Complex. Inorg Chem 2017; 56:14859-14869. [PMID: 29218992 DOI: 10.1021/acs.inorgchem.7b02097] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A density functional theory (DFT) investigation performed at the B3LYP/TZVP//B3LYP/6-31G(d)-LANL2DZ level of theory on the hydroamination of dimethylamine (Me2NH) on an activated olefin (namely, acrylonitrile (CH2═CHCN)), as catalyzed by a 1,2,4-triazol based nickel(II) N-heterocyclic carbene complex (namely, [1,4-dimethyl-1,2,4-triazole-5-ylidene]2 nickel dichloride) revealed that the olefin coordination pathway is favorable over the amine coordination pathway, although the initial olefin coordination step is higher in energy than the initial amine coordination step. Significantly enough, the reaction involved a crucial 1,3-proton transfer step between the resonance intermediates, i.e., the C-bound [(NHC)2Ni(CH(CN)CH2NHMe2)]+ (D) species or N-bound [(NHC)2Ni(NCCHCH2NHMe2)]+ (E) species and the intermediate [(NHC)2Ni(NCCH2CH2NMe2)]+ (F), depicting the cleavage of a N-H bond and the formation of a C-H bond facilitated by a water-assisted/amine-assisted proton shuttle. Overall, among the various pathways explored, the lowest energy pathway involved alkene coordination, followed by an amine-assisted 1,3-proton transfer step.
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Affiliation(s)
- Ravi Kumar
- Department of Chemistry, Indian Institute of Technology Bombay , Powai, Mumbai-400 076, India
| | - Madanakrishna Katari
- Department of Chemistry, Indian Institute of Technology Bombay , Powai, Mumbai-400 076, India
| | - Ajay Choudhary
- Department of Chemistry, Indian Institute of Technology Bombay , Powai, Mumbai-400 076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay , Powai, Mumbai-400 076, India
| | - Prasenjit Ghosh
- Department of Chemistry, Indian Institute of Technology Bombay , Powai, Mumbai-400 076, India
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5
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Atkins AJ, Talotta F, Freitag L, Boggio-Pasqua M, González L. Assessing Excited State Energy Gaps with Time-Dependent Density Functional Theory on Ru(II) Complexes. J Chem Theory Comput 2017; 13:4123-4145. [DOI: 10.1021/acs.jctc.7b00379] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Andrew J. Atkins
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, A-1090 Vienna, Austria
| | - Francesco Talotta
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, A-1090 Vienna, Austria
- Laboratoire de
Chimie et Physique Quantiques (UMR5626), CNRS et Université
de Toulouse 3, 31062 Toulouse, France
| | - Leon Freitag
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, A-1090 Vienna, Austria
| | - Martial Boggio-Pasqua
- Laboratoire de
Chimie et Physique Quantiques (UMR5626), CNRS et Université
de Toulouse 3, 31062 Toulouse, France
| | - Leticia González
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, A-1090 Vienna, Austria
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6
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Lu N, Bu Y. Computational design of three Cu-induced triangular pyrimidines based DNA motifs with improved conductivity. CAN J CHEM 2017. [DOI: 10.1139/cjc-2016-0595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Novel DNA triangular pyrimidine derivatives are designed by metal decoration through replacement of H by Cu in the Watson–Crick hydrogen bond region. The DFT method is used to examine the coordination of triangle-arranged Cu with three pyrimidines in nonplanar three-bladed turbine geometries. The Cu···Cu cuprophilic bonds are ascribed to the partially occupied d orbitals without direct molecular orbital (MO) interactions. Four-center bonds depend on Cu–N/O bonds, which are contributed by p orbitals of N/O atoms along or perpendicular to the bond axis. The activity of frontier MOs is modulated, leading to the decrease of gaps, ionization potentials (IPs), and electron affinities (EAs) desired for the improvement of conductivity. The hole trapping ability is assured by virtue of the spin density distributed on Cu. On average, the single electron density is located on π orbitals of three aromatic base rings. There is paramagnetic electron delocalization on the inner d orbitals of triangle region. The analysis of electron localization function ELF-π and electrostatic potential maps reveals that the outer strong π–π stacking interaction together with the inner d orbital channel enable effective transduction of electrical signals along the Cu–DNA nanowires. The 3Cu-induced triangular pyrimidines have important potential applications as structural motifs of molecular electronic devices.
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Affiliation(s)
- Nan Lu
- College of Chemistry and Material Science, Shandong Agricultural University, Taian, P. R. China, 271018
| | - Yuxiang Bu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, P. R. China, 250100
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Bettanin F, Antonio FCT, Honorio KM, Homem-de-Mello P. Quantum-chemistry descriptors for photosensitizers based on macrocycles. Chem Biol Drug Des 2017; 89:207-220. [DOI: 10.1111/cbdd.12791] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 04/22/2016] [Accepted: 05/15/2016] [Indexed: 11/29/2022]
Affiliation(s)
- Fernanda Bettanin
- ABCSim; Centro de Ciências Naturais e Humanas; Universidade Federal do ABC; Santo André SP Brazil
- Departamento de Química; Instituto Tecnológico da Aeronáutica; São José dos Campos SP Brazil
| | - Felipe C. T. Antonio
- ABCSim; Centro de Ciências Naturais e Humanas; Universidade Federal do ABC; Santo André SP Brazil
| | - Kathia M. Honorio
- ABCSim; Centro de Ciências Naturais e Humanas; Universidade Federal do ABC; Santo André SP Brazil
- Escola de Artes, Ciências e Humanidades; Universidade de São Paulo; São Paulo Brazil
| | - Paula Homem-de-Mello
- ABCSim; Centro de Ciências Naturais e Humanas; Universidade Federal do ABC; Santo André SP Brazil
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8
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Azarias C, Jacquemin D. Elucidating the Nature of Carbazole–Porphyrinoids with First-Principle Approaches. J Phys Chem A 2016; 120:2824-31. [DOI: 10.1021/acs.jpca.6b02313] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cloé Azarias
- CEISAM,
UMR CNRS
6230, BP 92208, Université de Nantes, 2, Rue de la Houssinière, 44322 Nantes, Cedex 3, France
| | - Denis Jacquemin
- CEISAM,
UMR CNRS
6230, BP 92208, Université de Nantes, 2, Rue de la Houssinière, 44322 Nantes, Cedex 3, France
- Institut Universitaire de France, 1, rue Descartes, F-75005 Paris Cedex 05, France
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9
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Menéndez MI, López R, Yañez M, Cárdenas-Jirón G. Tautomerization mechanism and spectral properties of porphyrin–glucose complexes as models of antibacterial material. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-1878-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Lu N, Bu Y, Wang H. Intensified effects of multi-Cu modification on the electronic properties of the modified base pairs containing hetero-ring-expanded pyrimidine bases. Phys Chem Chem Phys 2016; 18:2913-23. [PMID: 26733396 DOI: 10.1039/c5cp06133d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Novel DNA base pair derivatives (A2CunU, A2CunC, G3CunU, and G3CunC) are designed by aromatic expansion of pyrimidine bases with four kinds of hetero-rings (denoted by nC and nU, n = 1, 2, 3, and 4) and metal-decoration through Cu replacement of hydrogens in the Watson-Crick hydrogen bond region. Their structures and properties are calculated for examining the cooperative effects of the two modification ways. The calculated results reveal that multiple Cu decoration makes up the deficiencies of size-expansion, and exhibits not only increase of structural stability and reduction of ionization potentials, but also ideal shrink of the HOMO-LUMO gaps, notable enhancement of interbase coupling as well as remarkable redshifts of π → π* transitions for all M-x modified base pairs. The decrease extents of the gaps and ionization potentials follow the same order G3CunU > G3CunC > A2CunU > A2CunC, and in each series (denoted by different n), the gaps, ionization potentials and first π → π* transition energies have an order of 4 < 1 < 2 < 3. The Cu d orbitals function as bridges for π electron delocalization on the conjugated aromatic rings of two bases, leading to an enhancement of transverse electronic communication, as verified by spin density delocalization, orbital composition changes, redshift of the π → π* transition and also advocated by the electron-sharing indexes such as delocalization index, Mayer bond orders and multicenter bonding. Electron localization function ELF-π isosurfaces above the molecular plane further suggested that effective longitudinal conduction is closely relevant with the bicyclic domain involving good electron delocalization and strong π-π stacking between layers. This work presents theoretical evidence for the cooperative effects of metal decoration and ring-expansion modifications on the electronic properties of the modified base pairs and also proves that the base pairs designed here could be competent building blocks for the DNA-based nanowires with improved electron activity and excellent conductivity.
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Affiliation(s)
- Nan Lu
- College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, P. R. China and School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P. R. China.
| | - Yuxiang Bu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P. R. China.
| | - Huatian Wang
- College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, P. R. China
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11
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de Assis FF, Ferreira MAB, Brocksom TJ, de Oliveira KT. NIR bacteriochlorin chromophores accessed by Heck and Sonogashira cross-coupling reactions on a tetrabromobacteriochlorin derivative. Org Biomol Chem 2016; 14:1402-12. [DOI: 10.1039/c5ob02228b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of a new tetrabromobacteriochlorin BCBr4 is reported. Pd cross-coupling reactions yielded tetra-coupled products with a significant red shift in the UV-Vis bands.
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Affiliation(s)
- Francisco F. de Assis
- Departamento de Química
- Universidade Federal de São Carlos – UFSCar
- 13565-905 São Carlos
- Brazil
| | - Marco A. B. Ferreira
- Departamento de Química
- Universidade Federal de São Carlos – UFSCar
- 13565-905 São Carlos
- Brazil
| | - Timothy J. Brocksom
- Departamento de Química
- Universidade Federal de São Carlos – UFSCar
- 13565-905 São Carlos
- Brazil
| | - Kleber T. de Oliveira
- Departamento de Química
- Universidade Federal de São Carlos – UFSCar
- 13565-905 São Carlos
- Brazil
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12
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Aggregation of photosensitizers: the role of dispersion and solvation on dimer formation energetics. Theor Chem Acc 2015. [DOI: 10.1007/s00214-015-1732-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Katari M, Rajaraman G, Ghosh P. An insight into a base-free Michael addition reaction as catalyzed by a bifunctional nickel N-heterocyclic carbene complex using density functional theory studies. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.02.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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14
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Shrestha K, González-Delgado JM, Blew JH, Jakubikova E. Electronic Structure of Covalently Linked Zinc Bacteriochlorin Molecular Arrays: Insights into Molecular Design for NIR Light Harvesting. J Phys Chem A 2014; 118:9901-13. [DOI: 10.1021/jp507749c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Kushal Shrestha
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Jessica M. González-Delgado
- Department
of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
| | - James H. Blew
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Elena Jakubikova
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
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15
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Kania A, Pilch M, Rutkowska-Zbik D, Susz A, Heriyanto, Stochel G, Fiedor L. High-pressure and theoretical studies reveal significant differences in the electronic structure and bonding of magnesium, zinc, and nickel ions in metalloporphyrinoids. Inorg Chem 2014; 53:8473-84. [PMID: 25072655 DOI: 10.1021/ic501029b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High pressure in combination with optical spectroscopy was used to gain insights into the interactions between Mg(2+), Zn(2+), and Ni(2+) ions and macrocyclic ligands of porphyrinoid type. In parallel, the central metal ion-macrocycle bonding was investigated using theoretical approaches. The symmetry properties of the orbitals participating in this bonding were analyzed, and pigment geometries and pressure/ligation effects were computed within DFT. Bacteriopheophytin a was applied as both a model chelator and a highly specific spectroscopic probe. The analysis of solvent and pressure effects on the spectral properties of the model Mg(2+), Zn(2+), and Ni(2+) complexes with bacteriopheophytin a shows that various chemical bonds are formed in the central pocket, depending on the valence configuration of the central metal ion. In addition, the character of this bonding depends on symmetry of the macrocyclic system. Since in most cases it is not coordinative bonding, these results challenge the conventional view of metal ion bonding in such complexes. In (labile) complexes with the main group metals, the metal ion-macrocycle interaction is mostly electrostatic. Significantly, water molecules are not preferred as a second axial ligand in such complexes, mainly due to the entropic constraints. The metal ions with a closed d shell may form (stable) complexes with the macrocycle via classical coordination bonds, engaging their p and s orbitals. Transition metals, due to the unfilled d shell, do form much more stable complexes, because of strong bonding via both coordination and covalent interactions. These conclusions are confirmed by DFT computations and theoretical considerations, which altogether provide the basis to propose a consistent and general mechanism of how the central metal ion and its interactions with the core nitrogens govern the physicochemical properties of metalloporphyrinoids.
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Affiliation(s)
- Agnieszka Kania
- Faculty of Chemistry, Jagiellonian University , ul. Ingardena 3, 30-060 Kraków, Poland
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16
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Dutta A, Dutta RK. Fluorescence behavior of cis-methyl orange stabilized in cationic premicelles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 126:270-279. [PMID: 24607477 DOI: 10.1016/j.saa.2014.02.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 01/29/2014] [Accepted: 02/07/2014] [Indexed: 06/03/2023]
Abstract
The cis-isomer of methyl orange (MO), stabilized in cationic premicelles, has been found to be fluorescence active when excited at wavelength ≤270nm. An intense fluorescence band with maximum at 575nm along with a broad moderate intensity band in the range of 370-530nm and a low intensity band at 361nm have been observed. The major band at 575nm has been attributed to S1→S0 (n-π(*)) fluorescence unlike the other azobenzenes where the S2→S0 (π-π(*)) fluorescence is usually reported. UV-Vis spectral and surface tension study indicate that the dye exists in the trans form in dye-surfactant ionpair (DSIP) at very dilute concentrations of the surfactant. But the polar cis-isomer is stabilized by micellization of the DSIPs as the concentration of the surfactant is increased. The fluorescence and hence the cis-isomer again disappear when normal micelles are formed above the normal CMC of the surfactant. It has been suggested that the symmetry forbidden S1→S0 (n-π(*)) transition of MO becomes allowed due to the formation of the twisted cis-form. TD-DFT calculations have been used as an auxiliary tool to identify the possible structures and electronic transitions responsible for the specific absorption and fluorescence properties of MO observed in presence of premicellar cationic surfactants.
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Affiliation(s)
- Anisha Dutta
- Department of Chemical Sciences, Tezpur University, Tezpur 784028, Assam, India.
| | - Robin K Dutta
- Department of Chemical Sciences, Tezpur University, Tezpur 784028, Assam, India.
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17
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Stabilization of diketo tautomer of curcumin by premicellar cationic surfactants: A spectroscopic, tensiometric and TD-DFT study. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2013.09.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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18
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Alberto ME, Iuga C, Quartarolo AD, Russo N. Bisanthracene bis(dicarboxylic imide)s as potential photosensitizers in photodynamic therapy: a theoretical investigation. J Chem Inf Model 2013; 53:2334-40. [PMID: 23899186 DOI: 10.1021/ci4003365] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The electronic structures and spectroscopic properties of four bisanthracene bis(dicarboxylic imide)s (M1-M4) have been investigated theoretically by using density functional theory (DFT) and its time-dependent extension (TDDFT) in view of their potential use as photosensitizers in photodynamic therapy (PDT). The optimized geometries, electronic absorption transitions, singlet-triplet energy gaps, spin-orbit matrix elements, ionization potentials, and electron affinities have been determined in gas phase and in solvent. Both type I and II PDT mechanisms have been considered. In addition, the variation of a series of relevant properties upon heavy atom substitution (Br and I) have been determined and discussed. Results show that only M4 is able to support the type I reaction, and one of its brominated and iodinated derivatives can produce cytotoxic singlet oxygen (type II reaction).
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Affiliation(s)
- Marta E Alberto
- Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria , 87036 Rende, Italy
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19
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Metallobacteriochlorophylls as potential dual agents for photodynamic therapy and chemotherapy. J Mol Model 2013; 19:4155-61. [PMID: 23306811 PMCID: PMC3778232 DOI: 10.1007/s00894-012-1747-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 12/20/2012] [Indexed: 11/29/2022]
Abstract
A theoretical analysis of bacteriochlorophyll a containing its non-native divalent metal ions: Co, Ni, Cu, Zn, Ru, Rh, Pd, and Pt, has been carried out by means of density functional theory (DFT) calculations. The main stress was put on the derivatives with metals, which already found applications as coordination compounds in anti-tumor therapy (Ru, Pt, Pd, and Rh). The idea was to combine their cytotoxic properties with the known suitability of bacteriochlorophylls macrocycle for photodynamic therapy. The geometries of the studied systems are compared and reveal a number of similarities. The cores of the modified bacteriochlorophylls are flat, and the introduced metal ions lie in plane of the macrocycle, showing its large ability to accommodate metal ions of different sizes. However, four metal–nitrogen bonds, linking the central ions with the macrocycle ligand, are not equivalent. Metals are the strongest attached to nitrogens, which come from the pyrrole, which is fused with isocyclic ring. Based on the known spectroscopic data, the absorption properties of the proposed systems are predicted. Finally, it is found that all studied metal–macrocycle adducts are stable in aqueous media. The only exceptions are Mg-BChla (the finding is reflected by experimental facts) and Zn-BChla. The predicted high stability of Ru-, Rh-, Pt- and Pd-bacteriochlorophylls might turn out beneficial for therapeutic purposes.
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20
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Nithya R, Kolandaivel P, Senthilkumar K. Understanding the absorption and emission spectra of borondipyrromethene dye and its substituted analogues. Mol Phys 2012. [DOI: 10.1080/00268976.2012.655792] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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21
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A quantum chemical study on the free radical scavenging activity of tyrosol and hydroxytyrosol. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1173-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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22
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Zhou CH, Zhao X. Chemically modified fullerene derivatives as photosensitizers in photodynamic therapy: A first-principles study. J Comput Chem 2012; 33:861-7. [DOI: 10.1002/jcc.22922] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2011] [Revised: 12/06/2011] [Accepted: 12/07/2011] [Indexed: 02/05/2023]
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23
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Galano A, Martínez A. Capsaicin, a Tasty Free Radical Scavenger: Mechanism of Action and Kinetics. J Phys Chem B 2012; 116:1200-8. [DOI: 10.1021/jp211172f] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Annia Galano
- Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C. P. 09340, México D. F., México
| | - Ana Martínez
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S. N., Ciudad Universitaria, CP 04510, México D.F., México
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Alberto ME, Marino T, Russo N, Sicilia E, Toscano M. The performance of density functional based methods in the description of selected biological systems and processes. Phys Chem Chem Phys 2012; 14:14943-53. [DOI: 10.1039/c2cp41836c] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Yoon I, Park HS, Cui BC, Li JZ, Kim JH, Lkhagvadulam B, Shim YK. Photodynamic and Antioxidant Activities of Divalent Transition Metal Complexes of Methyl Pheophorbide-a. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.8.2981] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Nithya R, Santhanamoorthi N, Kolandaivel P, Senthilkumar K. Structural and Spectral Properties of 4-Bromo-1-naphthyl Chalcones: A Quantum Chemical Study. J Phys Chem A 2011; 115:6594-602. [DOI: 10.1021/jp1098393] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. Nithya
- Department of Physics, Bharathiar University, Coimbatore, India 641 046
| | | | - P. Kolandaivel
- Department of Physics, Bharathiar University, Coimbatore, India 641 046
| | - K. Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore, India 641 046
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Miao TF, Li J, Liao SY, Zheng KC, Ji LN. Theoretical studies on DNA-binding, DNA-photocleavage and spectral properties of Co(III) complexes [Co(phen)2(L)]3+ (L=pip, hpip, hnaip). Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.07.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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A theoretical investigation on the spectroscopic properties and photosensitizing capability of 5, 10, 15, 20-tetraphenylsapphyrin and 5, 10, 15, 20-tetraphenyl-26,28-diheterosapphyrins with two O, S, or Se Atoms. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0735-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fayet G, Jacquemin D, Wathelet V, Perpète EA, Rotureau P, Adamo C. Excited-state properties from ground-state DFT descriptors: A QSPR approach for dyes. J Mol Graph Model 2010; 28:465-71. [DOI: 10.1016/j.jmgm.2009.11.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2009] [Revised: 10/30/2009] [Accepted: 11/04/2009] [Indexed: 11/30/2022]
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Ahmida M, Larocque R, Ahmed MS, Vacaru A, Donnio B, Guillon D, Eichhorn SH. Halide effect in electron rich and deficient discotic phthalocyanines. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b917169j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang Y, Jiang J. Circular Dichroism of Chiral 1,8,15,22-Tetra(alkoxyl)phthalocyaninato Lead and Yttrium Complexes: Time-Dependent Density Functional Theory Calculations. J Phys Chem A 2009; 113:12179-86. [DOI: 10.1021/jp903014s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yuexing Zhang
- Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, and Department of Chemistry, Shandong University, Jinan 250100, China
| | - Jianzhuang Jiang
- Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, and Department of Chemistry, Shandong University, Jinan 250100, China
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Santhanamoorthi N, Senthilkumar K, Kolandaivel P. Absorption and emission properties of phenylene ethynylene oligomers: effect of substitution and π-conjugation length. Mol Phys 2009. [DOI: 10.1080/00268970902997858] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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33
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Zhu YL, Zhou SY, Kan YH, Su ZM. Theoretical investigation of electronic structures and excitation energies of hexaphyrin and its group 11 transition metal (III) complexes. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2009.05.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Quartarolo AD, Lanzo I, Sicilia E, Russo N. Can phthalocyanines and their substituted alpha-para-(methoxy)phenyl derivatives act as photosensitizers in photodynamic therapy? A TD-DFT study. Phys Chem Chem Phys 2009; 11:4586-92. [PMID: 19475179 DOI: 10.1039/b819064j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A time-dependent density functional theory study (TD-DFT) is presented regarding the substituent effects on the Q-bands of two classes of non-planar phthalocyanines: the alpha-octaphenyl and p-alpha-octamethoxyphenyl substituted compounds, in their free-base and zinc complex forms. Singlet vertical excitation energies, computed at the PBE0/SVP//BP86/SVP level of theory also including bulk solvent effects (COSMO model), resulted within 0.1 eV of experiment. The experimental red-shift for the Q-band, going from the phenylated to the methoxyphenylated case, was well-reproduced theoretically and in the latter case it was found to depend mainly on the nature of the substituents and partly on structure distortion effects. The energetic gap between the singlet ground and first triplet excited state was calculated in solvent to be 1.28 eV for the free-base phthalocyanine (H2Pc) and 1.45 eV for the unsubstituted zinc complex (ZnPc) and lower than 0.98 eV for all the other compounds, which is the energetic lower limit for a molecule to act as photosensitiser in photodynamic therapy according to a Type II reaction mechanism. As a consequence, since this property-requirement for drugs used in photodynamic therapy is not fulfilled by the investigated near-infrared photosensitizers, they cannot be proposed as candidates for their use in this medical treatment.
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Affiliation(s)
- Angelo Domenico Quartarolo
- Dipartimento di Chimica and Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite-Centro di Eccellenza MURST, Università della Calabria, I-87030, Arcavacata di Rende, Italy
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Lanzo I, Quartarolo AD, Russo N, Sicilia E. Can subpyriporphyrin and its boron complex be proposed as photosensitizers in photodynamic therapy ? A first principle time dependent study. Photochem Photobiol Sci 2009; 8:386-90. [DOI: 10.1039/b817718j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Maurel F, Perrier A, Perpète EA, Jacquemin D. A theoretical study of the perfluoro-diarylethenes electronic spectra. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2008.05.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Jacquemin D, Perpète EA, Adamo C. Modelling the UV/visible spectrum of tetrakis(phenylethynyl)benzene. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.theochem.2008.05.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Zhang Y, Cai X, Qi D, Yao P, Bian Y, Jiang J. Methyloxy Substituted Heteroleptic Bis(phthalocyaninato) Yttrium Complexes: Density Functional Calculations. Chemphyschem 2008; 9:781-92. [DOI: 10.1002/cphc.200700843] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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40
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Jacquemin D, Perpète EA, Ciofini I, Adamo C. On the TD-DFT UV/vis spectra accuracy: the azoalkanes. Theor Chem Acc 2008. [DOI: 10.1007/s00214-008-0424-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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41
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Preat J, Michaux C, Lewalle A, Perpète EA, Jacquemin D. Delocalisation in conjugated triazene chromophores: Insights from theory. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2007.11.056] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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42
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Perpète EA, Lambert C, Wathelet V, Preat J, Jacquemin D. Ab initio studies of the lambda(max) of naphthoquinones dyes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 68:1326-33. [PMID: 17395529 DOI: 10.1016/j.saa.2007.02.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2006] [Revised: 02/12/2007] [Accepted: 02/14/2007] [Indexed: 05/14/2023]
Abstract
Using a state-of-the-art time-dependent density functional (TD-DFT) approach that includes the explicit consideration of bulk medium effects on both the ground-state geometry and the electronic spectrum, we have determined the lambda(max) of 86 naphthoquinones (NQ) dyes in various solvents for a total of 151 cases. In most cases, TD-DFT provides the correct ordering of transitions for substituted NQ dyes. Comparisons with experimental values lead to a mean signed error of -7.2 nm (0.039 eV) and a mean absolute error of 20.1 nm (0.113 eV). It turns out that the average errors are smaller for the hydroxy and methoxy derivatives, than for amino substituted dyes. It is also demonstrated that the statistical treatment of the data does not significantly improve the agreement between the experimental and the theoretical values. We also discuss average basis set effects and solvatochromism.
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Affiliation(s)
- Eric A Perpète
- Laboratoire de Chimie Théorique Appliquée, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000, Namur, Belgium
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44
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Guedes RC, Eriksson LA. Photophysics, photochemistry, and reactivity: molecular aspects of perylenequinone reactions. Photochem Photobiol Sci 2007; 6:1089-96. [PMID: 17914483 DOI: 10.1039/b704869f] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Density functional theory (DFT) and time-dependent density functional theory (TD-DFT) were used to elucidate the photochemistry and photophysics of eight different perylenequinones (PQ). The objective of this work has been to quantitatively investigate the photodynamic therapeutic potential of this family of compounds and give an overview of their photoreactivity. The effects of solvation were evaluated through single-point calculations using the integral equation formalism of the polarised continuum model. It is concluded that the eight studied perylenequinones can generate singlet oxygen (in aqueous solution) and superoxide radical anions, and that the autoionisation of two nearby PQ molecules is possible.
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Affiliation(s)
- Rita Cardoso Guedes
- iMED.UL/CECF, Faculty of Pharmacy of the University of Lisbon, Av., Prof. Gama Pinto 2, 1649-016, Lisbon, Portugal.
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46
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Zhu Y, Zhou S, Kan Y, Yan L, Su Z. Theoretical investigation of electronic structures and excitation energies of doubly N-confused porphyrin and its group 11 transition metal (III) complexes. J Chem Phys 2007; 126:245106. [PMID: 17614594 DOI: 10.1063/1.2749513] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Density functional theory is carried out to study cis-doubly N-confused porphyrin and its metal (Cu3+, Ag3+, and Au3+) complexes. The electronic structures and bonding situations of these molecules have been investigated by using the natural bond orbital analysis and the topological analysis of the electron localization function. We have studied the electronic spectra of cis-doubly N-confused porphyrin and its metal complexes with time-dependent density functional theory. The introduction of group 11 transition metals leads to blueshifts of their electronic spectra with respect to that of cis-doubly N-confused porphyrin. In particular, the absorption spectra of the copper complex show some weak Q bands that mainly arise from a combination of ligand-to-metal charge transfer and ligand-to-ligand charge transfer transitions. The relativistic time-dependent density functional theory with spin-orbit coupling calculations indicates that the effects of spin-orbit coupling on the excitation energies of the copper and silver complexes are so small that it is safe enough to neglect spin-orbit interactions for these two complexes. However, it has a significant effect on the absorption spectra of the gold complex.
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Affiliation(s)
- Yulan Zhu
- Jiangsu Province Key Laboratory for Chemistry of Low-dimensional Materials, Department of Chemistry, Huaiyin Teachers College, Huaian, Jiangsu 223300, People's Republic of China.
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Jacquemin D, Perpète EA, Scalmani G, Frisch MJ, Kobayashi R, Adamo C. Assessment of the efficiency of long-range corrected functionals for some properties of large compounds. J Chem Phys 2007; 126:144105. [PMID: 17444699 DOI: 10.1063/1.2715573] [Citation(s) in RCA: 261] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using the long-range correction (LC) density functional theory (DFT) scheme introduced by Iikura et al. [J. Chem. Phys. 115, 3540 (2001)] and the Coulomb-attenuating model (CAM-B3LYP) of Yanai et al. [Chem. Phys. Lett. 393, 51 (2004)], we have calculated a series of properties that are known to be poorly reproduced by standard functionals: Bond length alternation of pi-conjugated polymers, polarizabilities of delocalized chains, and electronic spectra of extended dyes. For each of these properties, we present cases in which traditional hybrid functionals do provide accurate results and cases in which they fail to reproduce the correct trends. The quality of the results is assessed with regard to experimental values and/or data arising from electron-correlated wave function approaches. It turns out that (i) both LC-DFT and CAM-B3LYP provide an accurate bond length alternation for polyacetylene and polymethineimine, although for the latter they decrease slightly too rapidly with chain length. (ii) The LC generalized gradient approximation and MP2 polarizabilities of long polyphosphazene and polymethineimine oligomers agree almost perfectly. In the same way, CAM-B3LYP corrects the major part of the B3LYP faults. (iii) LC and CAM techniques do not help in correcting the nonrealistic evolution with chain length of the absorption wavelengths of cyanine derivatives. In addition, though both schemes significantly overestimate the ground to excited state transition energy of substituted anthraquinone dyes, they provide a more consistent picture once a statistical treatment is performed than do traditional hybrid functionals.
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Affiliation(s)
- Denis Jacquemin
- Laboratoire de Chimie Théorique Appliquée, Facultés Universitaires Notre-Dame de la Paix, rue de Bruxelles, 61, B-5000 Namur, Belgium.
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Cai X, Zhang Y, Zhang X, Jiang J. Structures and properties of metal-free and copper tetrakis(thiadiazole) porphyrazine and metal-free tetrakis(selenodiazole) porphyrazine based on density functional theory calculations. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2007.02.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Quartarolo AD, Russo N, Sicilia E. Structures and electronic absorption spectra of a recently synthesised class of photodynamic therapy agents. Chemistry 2007; 12:6797-803. [PMID: 16858734 DOI: 10.1002/chem.200501636] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A theoretical study was performed on a novel class of boron-containing molecules (various substituted tetraarylazadipyrromethenes), which show in vitro activity for application in photodynamic therapy. Geometric optimisation of the structures for the singlet and triplet electronic states was carried out on compounds in vacuo at the density functional level of theory, by employing the PBE0 hybrid functional and the split-valence plus polarisation basis set. The absorbance properties in the UV-visible region were examined by means of time-dependent density functional response theory, using the same functional as mentioned above. To evaluate the influence of the solvent on the excitation energies, the continuum polarisable model was applied. Calculated electronic excitations, such as those regarding the Q-like band, were found to be in good agreement (within 0.01-0.1 eV) with experimental values and experimental trends on changing both the substituents and solvent.
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Affiliation(s)
- Angelo Domenico Quartarolo
- Dipartimento di Chimica and Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite, Centro d'Eccellenza MURST, Università della Calabria, 87030 Arcavacata di Rende, Italy
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Jacquemin D, Perpète EA, Assfeld X, Scalmani G, Frisch MJ, Adamo C. The geometries, absorption and fluorescence wavelengths of solvated fluorescent coumarins: A CIS and TD-DFT comparative study. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.03.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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