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Bolser DC, Shen TY, Musselwhite MN, Rose MJ, Hayes JA, Pitts T. Evidence for peripheral and central actions of codeine to dysregulate swallowing in the anesthetized cat. Front Neurol 2024; 15:1356603. [PMID: 38938779 PMCID: PMC11210455 DOI: 10.3389/fneur.2024.1356603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 05/06/2024] [Indexed: 06/29/2024] Open
Abstract
Systemic administration of opioids has been associated with aspiration and swallow dysfunction in humans. We speculated that systemic administration of codeine would induce dysfunctional swallowing and that this effect would have a peripheral component. Experiments were conducted in spontaneously breathing, anesthetized cats. The animals were tracheotomized and electromyogram (EMG) electrodes were placed in upper airway and chest wall respiratory muscles for recording swallow related motor activity. The animals were allocated into three groups: vagal intact (VI), cervical vagotomy (CVx), and supra-nodose ganglion vagotomy (SNGx). A dose response to intravenous codeine was performed in each animal. Swallowing was elicited by injection of 3 mL of water into the oropharynx. The number of swallows after vehicle was significantly higher in the VI group than in SNGx. Codeine had no significant effect on the number of swallows induced by water in any of the groups. However, the magnitudes of water swallow-related EMGs of the thyropharyngeus muscle were significantly increased in the VI and CVx groups by 2-4 fold in a dose-related manner. In the CVx group, the geniohyoid muscle EMG during water swallows was significantly increased. There was a significant dose-related increase in spontaneous swallowing in each group from codeine. The spontaneous swallow number at the 10 mg/kg dose of codeine was significantly larger in the CVx group than that in the SNGx group. During water-evoked swallows, intravenous codeine increased upper airway motor drive in a dose-related manner, consistent with dysregulation. The data support the existence of both central and peripheral actions of codeine on spontaneous swallowing. At the highest dose of codeine, the reduced spontaneous swallow number in the SNGx group relative to CVx is consistent with a peripheral excitatory action of codeine either on pharyngeal/laryngeal receptors or in the nodose ganglion itself. The higher number of swallows in the CVx group than the VI group supports disinhibition of this behavior by elimination of inhibitory vagal sensory afferents.
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Affiliation(s)
- Donald C. Bolser
- Department of Physiological Sciences, University of Florida, Gainesville, FL, United States
| | - Tabitha Y. Shen
- Department of Physiological Sciences, University of Florida, Gainesville, FL, United States
| | | | - Melanie J. Rose
- Department of Physiological Sciences, University of Florida, Gainesville, FL, United States
| | - John A. Hayes
- Department of Physiological Sciences, University of Florida, Gainesville, FL, United States
| | - Teresa Pitts
- Department of Speech, Language, and Hearing Sciences, Department of Biomedical Sciences, Dalton Cardiovascular Center, University of Missouri, Columbia, MO, United States
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2
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Boulton S, Melacini G. Advances in NMR Methods To Map Allosteric Sites: From Models to Translation. Chem Rev 2016; 116:6267-304. [PMID: 27111288 DOI: 10.1021/acs.chemrev.5b00718] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The last five years have witnessed major developments in the understanding of the allosteric phenomenon, broadly defined as coupling between remote molecular sites. Such advances have been driven not only by new theoretical models and pharmacological applications of allostery, but also by progress in the experimental approaches designed to map allosteric sites and transitions. Among these techniques, NMR spectroscopy has played a major role given its unique near-atomic resolution and sensitivity to the dynamics that underlie allosteric couplings. Here, we highlight recent progress in the NMR methods tailored to investigate allostery with the goal of offering an overview of which NMR approaches are best suited for which allosterically relevant questions. The picture of the allosteric "NMR toolbox" is provided starting from one of the simplest models of allostery (i.e., the four-state thermodynamic cycle) and continuing to more complex multistate mechanisms. We also review how such an "NMR toolbox" has assisted the elucidation of the allosteric molecular basis for disease-related mutations and the discovery of novel leads for allosteric drugs. From this overview, it is clear that NMR plays a central role not only in experimentally validating transformative theories of allostery, but also in tapping the full translational potential of allosteric systems.
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Affiliation(s)
- Stephen Boulton
- Department of Chemistry and Chemical Biology Department of Biochemistry and Biomedical Sciences, McMaster University , 1280 Main St. W., Hamilton L8S 4M1, Canada
| | - Giuseppe Melacini
- Department of Chemistry and Chemical Biology Department of Biochemistry and Biomedical Sciences, McMaster University , 1280 Main St. W., Hamilton L8S 4M1, Canada
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3
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Kenny PW, Montanari CA, Prokopczyk IM, Ribeiro JFR, Sartori GR. Hydrogen Bond Basicity Prediction for Medicinal Chemistry Design. J Med Chem 2016; 59:4278-88. [DOI: 10.1021/acs.jmedchem.5b01946] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter W. Kenny
- Grupo de Estudos em Química
Medicinal—NEQUIMED, Instituto de Química de São
Carlos, Universidade de São Paulo, Av. Trabalhador Sancarlense, 400, 13560-590 São Carlos, São Paulo, Brazil
| | - Carlos A. Montanari
- Grupo de Estudos em Química
Medicinal—NEQUIMED, Instituto de Química de São
Carlos, Universidade de São Paulo, Av. Trabalhador Sancarlense, 400, 13560-590 São Carlos, São Paulo, Brazil
| | - Igor M. Prokopczyk
- Grupo de Estudos em Química
Medicinal—NEQUIMED, Instituto de Química de São
Carlos, Universidade de São Paulo, Av. Trabalhador Sancarlense, 400, 13560-590 São Carlos, São Paulo, Brazil
| | - Jean F. R. Ribeiro
- Grupo de Estudos em Química
Medicinal—NEQUIMED, Instituto de Química de São
Carlos, Universidade de São Paulo, Av. Trabalhador Sancarlense, 400, 13560-590 São Carlos, São Paulo, Brazil
| | - Geraldo Rodrigues Sartori
- Grupo de Estudos em Química
Medicinal—NEQUIMED, Instituto de Química de São
Carlos, Universidade de São Paulo, Av. Trabalhador Sancarlense, 400, 13560-590 São Carlos, São Paulo, Brazil
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Graton J, Le Questel JY, Maxwell P, Popelier P. Hydrogen-Bond Accepting Properties of New Heteroaromatic Ring Chemical Motifs: A Theoretical Study. J Chem Inf Model 2016; 56:322-34. [DOI: 10.1021/acs.jcim.5b00574] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Jérôme Graton
- Chimie
et Interdisciplinarité: Synthèse, Analyse, Modélisation
(CEISAM), UMR CNRS 6230, Université de Nantes, 2 rue de la
Houssinière−BP 92208, 44322 Nantes Cedex 3, France
| | - Jean-Yves Le Questel
- Chimie
et Interdisciplinarité: Synthèse, Analyse, Modélisation
(CEISAM), UMR CNRS 6230, Université de Nantes, 2 rue de la
Houssinière−BP 92208, 44322 Nantes Cedex 3, France
| | - Peter Maxwell
- Manchester Institute of Biotechnology (MIB), 131 Princess Street, Manchester M1 7DN, Great Britain
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, Great Britain
| | - Paul Popelier
- Manchester Institute of Biotechnology (MIB), 131 Princess Street, Manchester M1 7DN, Great Britain
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, Great Britain
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5
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Taillebois E, Alamiddine Z, Brazier C, Graton J, Laurent AD, Thany SH, Le Questel JY. Molecular features and toxicological properties of four common pesticides, acetamiprid, deltamethrin, chlorpyriphos and fipronil. Bioorg Med Chem 2015; 23:1540-50. [DOI: 10.1016/j.bmc.2015.02.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 01/22/2015] [Accepted: 02/04/2015] [Indexed: 11/16/2022]
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Gallagher R, Chebib M, Balle T, McLeod MD. Thiol-Reactive Analogues of Galanthamine, Codeine, and Morphine as Potential Probes to Interrogate Allosteric Binding within Nicotinic Acetylcholine Receptors. Aust J Chem 2015. [DOI: 10.1071/ch15475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Alkaloids including galanthamine (1) and codeine (2) are reported to be positive allosteric modulators of nicotinic acetylcholine receptors (nAChRs), but the binding sites responsible for this activity are not known with certainty. Analogues of galanthamine (1), codeine (2), and morphine (3) with reactivity towards cysteine thiols were synthesized including conjugated enone derivatives of the three alkaloids 4–6 and two chloro-alkane derivatives of codeine 7 and 8. The stability of the enones was deemed sufficient for use in buffered aqueous solutions, and their reactivity towards thiols was assessed by determining the kinetics of reaction with a cysteine derivative. All three enone derivatives were of sufficient reactivity and stability to be used in covalent trapping, an extension of the substituted cysteine accessibility method, to elucidate the allosteric binding sites of galanthamine and codeine at nAChRs.
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Martínez-Cifuentes M, Weiss-López BE, Santos LS, Araya-Maturana R. Intramolecular hydrogen bond in biologically active o-carbonyl hydroquinones. Molecules 2014; 19:9354-68. [PMID: 24995921 PMCID: PMC6270916 DOI: 10.3390/molecules19079354] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 06/18/2014] [Accepted: 06/27/2014] [Indexed: 11/16/2022] Open
Abstract
Intramolecular hydrogen bonds (IHBs) play a central role in the molecular structure, chemical reactivity and interactions of biologically active molecules. Here, we study the IHBs of seven related o-carbonyl hydroquinones and one structurally-related aromatic lactone, some of which have shown anticancer and antioxidant activity. Experimental NMR data were correlated with theoretical calculations at the DFT and ab initio levels. Natural bond orbital (NBO) and molecular electrostatic potential (MEP) calculations were used to study the electronic characteristics of these IHB. As expected, our results show that NBO calculations are better than MEP to describe the strength of the IHBs. NBO energies (∆Eij(2)) show that the main contributions to energy stabilization correspond to LP-->σ* interactions for IHBs, O1…O2-H2 and the delocalization LP-->π* for O2-C2=Cα(β). For the O1…O2-H2 interaction, the values of ∆Eij(2) can be attributed to the difference in the overlap ability between orbitals i and j (Fij), instead of the energy difference between them. The large energy for the LP O2-->π* C2=Cα(β) interaction in the compounds 9-Hydroxy-5-oxo-4,8, 8-trimethyl-l,9(8H)-anthracenecarbolactone (VIII) and 9,10-dihydroxy-4,4-dimethylanthracen-1(4H)-one (VII) (55.49 and 60.70 kcal/mol, respectively) when compared with the remaining molecules (all less than 50 kcal/mol), suggests that the IHBs in VIII and VII are strongly resonance assisted.
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Affiliation(s)
- Maximiliano Martínez-Cifuentes
- Laboratorio de Síntesis Asimétrica, Instituto de Química de los Recursos Naturales, Universidad de Talca, Talca, Casilla 747, Chile.
| | - Boris E Weiss-López
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Santiago, Casilla 653, Chile.
| | - Leonardo S Santos
- Laboratorio de Síntesis Asimétrica, Instituto de Química de los Recursos Naturales, Universidad de Talca, Talca, Casilla 747, Chile.
| | - Ramiro Araya-Maturana
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas Y Farmacéuticas, Universidad de Chile, Santiago, Casilla 233, Chile.
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8
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Ruggiu F, Solov'ev V, Marcou G, Horvath D, Graton J, Le Questel JY, Varnek A. Individual Hydrogen-Bond Strength QSPR Modelling with ISIDA Local Descriptors: a Step Towards Polyfunctional Molecules. Mol Inform 2014; 33:477-87. [PMID: 27485986 DOI: 10.1002/minf.201400032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Accepted: 05/15/2014] [Indexed: 11/09/2022]
Abstract
Here, we introduce new ISIDA fragment descriptors able to describe "local" properties related to selected atoms or molecular fragments. These descriptors have been applied for QSPR modelling of the H-bond basicity scale pKBHX , measured by the 1 : 1 complexation constant of a series of organic acceptors (H-bond bases) with 4-fluorophenol as the reference H-bond donor in CCl4 at 298 K. Unlike previous QSPR studies of H-bond complexation, the models based on these new descriptors are able to predict the H-bond basicity of different acceptor centres on the same polyfunctional molecule. QSPR models were obtained using support vector machine and ensemble multiple linear regression methods on a set of 537 organic compounds including 5 bifunctional molecules. They were validated with cross-validation procedures and with two external test sets. The best model displays good predictive performance on a large test set of 451 mono- and bifunctional molecules: a root-mean squared error RMSE=0.26 and a determination coefficient R(2) =0.91. It is implemented on our website (http://infochim.u-strasbg.fr/webserv/VSEngine.html) together with the estimation of its applicability domain and an automatic detection of potential H-bond acceptors.
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Affiliation(s)
- Fiorella Ruggiu
- Laboratoire de Chémoinformatique, UMR 7140 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg, France phone:+33368851560
| | - Vitaly Solov'ev
- Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskiy prospect, 31a, 119991, Moscow, Russian Federation
| | - Gilles Marcou
- Laboratoire de Chémoinformatique, UMR 7140 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg, France phone:+33368851560
| | - Dragos Horvath
- Laboratoire de Chémoinformatique, UMR 7140 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg, France phone:+33368851560
| | - Jérôme Graton
- Université de Nantes, UMR CNRS 6230, Chimie Et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UFR Sciences & Techniques, 2, rue de la Houssinière, BP 92208, 44322 NANTES Cedex 3, France
| | - Jean-Yves Le Questel
- Université de Nantes, UMR CNRS 6230, Chimie Et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UFR Sciences & Techniques, 2, rue de la Houssinière, BP 92208, 44322 NANTES Cedex 3, France
| | - Alexandre Varnek
- Laboratoire de Chémoinformatique, UMR 7140 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg, France phone:+33368851560.
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9
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Atkinson A, Graton J, Le Questel JY. Insights into a highly conserved network of hydrogen bonds in the agonist binding site of nicotinic acetylcholine receptors: a structural and theoretical study. Proteins 2014; 82:2303-17. [PMID: 24752960 DOI: 10.1002/prot.24589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/02/2014] [Accepted: 04/15/2014] [Indexed: 11/07/2022]
Abstract
Structural and theoretical studies on the geometrical features of a hydrogen-bond network occurring in the binding site of nicotinic acetylcholine receptors (nAChRs) and composed of interconnected WxPD (Trp-x-Pro-Asp) and SWyz (Ser-Trp-yz) sequences from loops A and B, respectively, have been carried out. Multiple sequence alignments using as template the sequence of the apoform of Aplysia californica acetylcholine binding protein (Ac-AChBP) show the strict conservation of serine and tryptophan residues of the loop B SWyz sequence. Considering a sample of 19 high resolution AChBP structures, the strong conformational preferences of the key tryptophan residue has been pointing out, whatever the form, free or bounded, of AChBP. The geometry of the motif hydrogen-bond network has been characterized through the analyses of seven distances. The robustness of the various hydrogen-bond interactions is pointed out, the one involving the aspartate carboxylate group and the serine residue being the shortest of the network. The role of a cooperative effect involving a NH(His145)…OH (Ser142) hydrogen bond is highlighted. Density functional theory calculations on several simplified models based on the motif hydrogen-bond network allow probing the importance of the various hydrogen-bond interactions. The removal of the Ser142 hydroxyl group induces strong structural rearrangements, in agreement with the structural observations. Molecular electrostatic potential calculations on model systems highlight the importance of a cooperative effect in the whole hydrogen-bond network. More precisely, the key role of the Ser142 hydroxyl group, involved in several hydrogen bonds, is underlined.
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Affiliation(s)
- Alexandre Atkinson
- Université de Nantes, CEISAM UMR 6230, UFR des Sciences et des Techniques, 2 rue de la Houssinière, BP 92208, Nantes, F-44322, France
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10
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Graton J, Besseau F, Brossard AM, Charpentier E, Deroche A, Le Questel JY. Hydrogen-Bond Acidity of OH Groups in Various Molecular Environments (Phenols, Alcohols, Steroid Derivatives, and Amino Acids Structures): Experimental Measurements and Density Functional Theory Calculations. J Phys Chem A 2013; 117:13184-93. [DOI: 10.1021/jp410027h] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jérôme Graton
- UMR CNRS
6230, Université de Nantes, CEISAM, 2 rue de la Houssinière, 44322 Nantes cedex 3, France
| | - François Besseau
- UMR CNRS
6230, Université de Nantes, CEISAM, 2 rue de la Houssinière, 44322 Nantes cedex 3, France
| | - Anne-Marie Brossard
- UMR CNRS
6230, Université de Nantes, CEISAM, 2 rue de la Houssinière, 44322 Nantes cedex 3, France
| | - Eloïse Charpentier
- UMR CNRS
6230, Université de Nantes, CEISAM, 2 rue de la Houssinière, 44322 Nantes cedex 3, France
| | - Arnaud Deroche
- UMR CNRS
6230, Université de Nantes, CEISAM, 2 rue de la Houssinière, 44322 Nantes cedex 3, France
| | - Jean-Yves Le Questel
- UMR CNRS
6230, Université de Nantes, CEISAM, 2 rue de la Houssinière, 44322 Nantes cedex 3, France
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11
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Galland N, Kone S, Le Questel JY. Mapping of the interaction sites of galanthamine: a quantitative analysis through pairwise potentials and quantum chemistry. J Comput Aided Mol Des 2012; 26:1111-26. [PMID: 22972560 DOI: 10.1007/s10822-012-9602-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 09/05/2012] [Indexed: 11/29/2022]
Abstract
A quantitative analysis of the interaction sites of the anti-Alzheimer drug galanthamine with molecular probes (water and benzene molecules) representative of its surroundings in the binding site of acetylcholinesterase (AChE) has been realized through pairwise potentials calculations and quantum chemistry. This strategy allows a full and accurate exploration of the galanthamine potential energy surface of interaction. Significantly different results are obtained according to the distances of approaches between the various molecular fragments and the conformation of the galanthamine N-methyl substituent. The geometry of the most relevant complexes has then been fully optimized through MPWB1K/6-31 + G(d,p) calculations, final energies being recomputed at the LMP2/aug-cc-pVTZ(-f) level of theory. Unexpectedly, galanthamine is found to interact mainly from its hydrogen-bond donor groups. Among those, CH groups in the vicinity of the ammonium group are prominent. The trends obtained provide rationales to the predilection of the equatorial orientation of the galanthamine N-methyl substituent for binding to AChE. The analysis of the interaction energies pointed out the independence between the various interaction sites and the rigid character of galanthamine. The comparison between the cluster calculations and the crystallographic observations in galanthamine-AChE co-crystals allows the validation of the theoretical methodology. In particular, the positions of several water molecules appearing as strongly conserved in galanthamine-AChE co-crystals are predicted by the calculations. Moreover, the experimental position and orientation of lateral chains of functionally important aminoacid residues are in close agreement with the ones predicted theoretically. Our study provides relevant information for a rational drug design of galanthamine based AChE inhibitors.
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Affiliation(s)
- Nicolas Galland
- UMR CNRS 6230, Chimie Et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UFR Sciences & Techniques, Université de Nantes, NANTES Cedex, France
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Zhang H, Wang Y, Yang D, Li Y, Liu H, Liu P, Wood BJ, Zhao H. Directly hydrothermal growth of single crystal Nb3O7(OH) nanorod film for high performance dye-sensitized solar cells. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:1598-1603. [PMID: 22354561 DOI: 10.1002/adma.201104650] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Revised: 01/29/2012] [Indexed: 05/31/2023]
Abstract
Hydrothermal growth of high crystallinity Nb(3) O(7) (OH) single crystal nanorod film onto FTO substrate is directly used as the photoanode for DSSCs without calcination. The resultant DSSCs possess an impressive overall efficiency of 6.77%, the highest among all reported DSSCs assembled by niobium oxide-based photoanodes.
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Affiliation(s)
- Haimin Zhang
- Centre for Clean Environment and Energy and Griffith School of Environment, Griffith University, Gold Coast Campus, QLD 4222, Australia
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