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Franco LR, Toledo KCF, Matias TA, Benavides PA, Cezar HM, Araujo CM, Coutinho K, Araki K. Unraveling the acid-base characterization and solvent effects on the structural and electronic properties of a bis-bidentate bridging ligand. Phys Chem Chem Phys 2022; 24:10222-10240. [PMID: 35420602 DOI: 10.1039/d1cp03912a] [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
Understanding the interactions and the solvent effects on the distribution of several species in equilibrium and how it can influence the 1H-NMR properties, spectroscopy (UV-vis absorption), and the acid-base equilibria can be especially challenging. This is the case of a bis-bidentate bridging ligand bis(2-pyridyl)-benzo-bis(imidazole), where the two pyridyl and four imidazolyl nitrogen atoms can be protonated in different ways, depending on the solvent, generating many isomeric/tautomeric species. Herein, we report a combined theoretical-experimental approach based on a sequential quantum mechanics/molecular mechanics procedure that was successfully applied to describe in detail the acid-base characterization and its effects on the electronic properties of such a molecule in solution. The calculated free-energies allowed the identification of the main species present in solution as a function of the solvent polarity, and its effects on the magnetic shielding of protons (1H-NMR chemical shifts), the UV-vis absorption spectra, and the acid-base equilibrium constants (pKas) in aqueous solution. Three acid-base equilibrium constants were experimentally/theoretically determined (pKa1 = 1.3/1.2, pKa2 = 2.1/2.2 and pKa5 = 10.1/11.3) involving mono-deprotonated and mono-protonated cis and trans species. Interestingly, other processes with pKa3 = 3.7 and pKa4 = 6.0 were also experimentally determined and assigned to the protonation and deprotonation of dimeric species. The dimerization of the most stable neutral species was investigated by Monte Carlo simulations and its electronic effects were considered for the elucidation of the UV-vis absorption bands, revealing transitions mainly with the charge-transfer characteristic and involving both the monomeric species and the dimeric species. The good matching of the theoretical and experimental results provides an atomistic insight into the solvent effects on the electronic properties of this bis-bidentate bridging ligand.
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Affiliation(s)
- Leandro Rezende Franco
- Instituto de Física, Universidade de São Paulo, Cidade Universitária, 05508-090 São Paulo, SP, Brazil. .,Department of Engineering and Physics, Karlstad University, 65188 Karlstad, Sweden
| | | | - Tiago Araujo Matias
- Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes 748, Butantã, 05508-000 São Paulo, SP, Brazil.
| | - Paola Andrea Benavides
- Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes 748, Butantã, 05508-000 São Paulo, SP, Brazil.
| | - Henrique Musseli Cezar
- Instituto de Física, Universidade de São Paulo, Cidade Universitária, 05508-090 São Paulo, SP, Brazil.
| | - C Moyses Araujo
- Department of Engineering and Physics, Karlstad University, 65188 Karlstad, Sweden.,Materials Theory Division, Department of Physics and Astronomy, Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden
| | - Kaline Coutinho
- Instituto de Física, Universidade de São Paulo, Cidade Universitária, 05508-090 São Paulo, SP, Brazil.
| | - Koiti Araki
- Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes 748, Butantã, 05508-000 São Paulo, SP, Brazil.
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2
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Naeimi A, Saeednia S. Morphology control of colloidal silver bio-nanoparticles leaves shape using Sesbania sesban. BIOINSPIRED BIOMIMETIC AND NANOBIOMATERIALS 2018. [DOI: 10.1680/jbibn.17.00023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Sesbania sesban extract solution (SSL) was used as a reducing and stabilizing agent for the synthesis of colloidal silver nanoparticles (AgNPs). The effect of time on the formation of nanoparticles was investigated using ultraviolet–visible spectroscopy. The AgNPs were synthesized after 25 min and characterized by high-resolution transmission electron microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The average sizes of nanoparticles were estimated to be between 10 and 30 nm. The XRD of AgNPs, after 4 months, showed the stability of nanoparticles in air. The effects of silver nitrate concentrations and SSL concentrations on the morphology and size of synthesized AgNPs were observed by SEM.
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3
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First biomimetic electrospun polymer from Carthamus tinctorius plant for sustainable synthesis of bis (1H-indol-3-yl)methanes. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.10.055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Fletcher JT, Hanson MD, Christensen JA, Villa EM. Revisiting ring-degenerate rearrangements of 1-substituted-4-imino-1,2,3-triazoles. Beilstein J Org Chem 2018; 14:2098-2105. [PMID: 30202463 PMCID: PMC6122373 DOI: 10.3762/bjoc.14.184] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 07/26/2018] [Indexed: 11/23/2022] Open
Abstract
The 1-substituted-4-imino-1,2,3-triazole motif is an established component of coordination compounds and bioactive molecules, but depending on the substituent identity, it can be inherently unstable due to Dimroth rearrangements. This study examined parameters governing the ring-degenerate rearrangement reactions of 1-substituted-4-imino-1,2,3-triazoles, expanding on trends first observed by L’abbé et al. The efficiency of condensation between 4-formyltriazole and amine reactants as well as the propensity of imine products towards rearrangement was each strongly influenced by the substituent identity. It was observed that unsymmetrical condensation reactions conducted at 70 °C produced up to four imine products via a dynamic equilibrium of condensation, rearrangement and hydrolysis steps. Kinetic studies utilizing 1-(4-nitrophenyl)-1H-1,2,3-triazole-4-carbaldehyde with varying amines showed rearrangement rates sensitive to both steric and electronic factors. Such measurements were facilitated by a high throughput colorimetric assay to directly monitor the generation of a 4-nitroaniline byproduct.
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Affiliation(s)
- James T Fletcher
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
| | - Matthew D Hanson
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
| | - Joseph A Christensen
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
| | - Eric M Villa
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
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Ghadi FE, Ghara AR, Naeimi A. Phytochemical fabrication, characterization, and antioxidant application of copper and cobalt oxides nanoparticles using Sesbania sesban plant. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0506-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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6
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Honarmand M, Naeimi A, Zahedifar M. Nanoammonium salt: a novel and recyclable organocatalyst for one-pot three-component synthesis of 2-amino-3-cyano-4H-pyran derivatives. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2017. [DOI: 10.1007/s13738-017-1127-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Liu HJ, Gil-Sepulcre M, Francàs L, Nolis P, Parella T, Benet-Buchholz J, Fontrodona X, García-Antón J, Romero N, Llobet A, Escriche L, Bofill R, Sala X. Mononuclear ruthenium compounds bearing N-donor and N-heterocyclic carbene ligands: structure and oxidative catalysis. Dalton Trans 2017; 46:2829-2843. [PMID: 28177011 DOI: 10.1039/c6dt04729g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new CNNC carbene-phthalazine tetradentate ligand has been synthesised, which in the reaction with [Ru(T)Cl3] (T = trpy, tpm, bpea; trpy = 2,2';6',2''-terpyridine; tpm = tris(pyrazol-1-yl)methane; bpea = N,N-bis(pyridin-2-ylmethyl)ethanamine) in MeOH or iPrOH undergoes a C-N bond scission due to the nucleophilic attack of a solvent molecule, with the subsequent formation of the mononuclear complexes cis-[Ru(PhthaPz-OR)(trpy)X]n+, [Ru(PhthaPz-OMe)(tpm)X]n+ and trans,fac-[Ru(PhthaPz-OMe)(bpea)X]n+ (X = Cl, n = 1; X = H2O, n = 2; PhthaPz-OR = 1-(4-alkoxyphthalazin-1-yl)-3-methyl-1H-imidazol-3-ium), named 1a+/2a2+ (R = Me), 1b+/2b2+ (R = iPr), 3+/42+ and 5+/62+, respectively. Interestingly, regulation of the stability regions of different Ru oxidation states is obtained by different ligand combinations, going from 62+, where Ru(iii) is clearly stable and mono-electronic transfers are favoured, to 2a2+/2b2+, where Ru(iii) is almost unstable with regard to its disproportionation. The catalytic performance of the Ru-OH2 complexes in chemical water oxidation at pH 1.0 points to poor stability (ligand oxidation), with subsequent evolution of CO2 together with O2, especially for 42+ and 62+. In electrochemically driven water oxidation, the highest TOF values are obtained for 2a2+ at pH 1.0. In alkene epoxidation, complexes favouring bi-electronic transfer processes show better performances and selectivities than those favouring mono-electronic transfers, while alkenes containing electron-donor groups show better performances than those bearing electron-withdrawing groups. Finally, when cis-β-methylstyrene is employed as the substrate, no cis/trans isomerization takes place, thus indicating the existence of a stereospecific process.
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Affiliation(s)
- Hai-Jie Liu
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Marcos Gil-Sepulcre
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Laia Francàs
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Catalonia, Spain
| | - Pau Nolis
- Servei de Ressonància Magnètica Nuclear, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain
| | - Teodor Parella
- Servei de Ressonància Magnètica Nuclear, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Catalonia, Spain
| | - Xavier Fontrodona
- Serveis Tècnics de Recerca, Edifici P-II, Campus Montilivi, Universitat de Girona, 17071 Girona, Catalonia, Spain
| | - Jordi García-Antón
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Nuria Romero
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Antoni Llobet
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain. and Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Catalonia, Spain
| | - Lluís Escriche
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Roger Bofill
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Xavier Sala
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
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8
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Naeimi A, Saeidi M, Baroumand N. Carboxylated carbon nanotubes as an efficient and cost-effective adsorbent for sustainable removal of insecticide fenvalerate from contaminated solutions. INTERNATIONAL NANO LETTERS 2016. [DOI: 10.1007/s40089-016-0193-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Bauzá A, Mooibroek TJ, Frontera A. Towards design strategies for anion–π interactions in crystal engineering. CrystEngComm 2016. [DOI: 10.1039/c5ce01813g] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This highlight article summarizes some of the fundamental aspects of the anion–π interaction leading to several design strategies for generating it in solids. In the main body we highlight some relevant examples that illustrate the viability of these strategies and the importance of anion–π interactions in crystal engineering.
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Affiliation(s)
- Antonio Bauzá
- Departament de Quimica
- Universitat de les Illes Balears
- 07122 Palma de Mallorca, Spain
| | | | - Antonio Frontera
- Departament de Quimica
- Universitat de les Illes Balears
- 07122 Palma de Mallorca, Spain
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10
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A novel dinuclear schiff base copper complex as an efficient and cost effective catalyst for oxidation of alcohol: Synthesis, crystal structure and theoretical studies. J CHEM SCI 2015. [DOI: 10.1007/s12039-015-0896-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Bis(iminopyridyl)phthalazine as a sterically hindered compartmental ligand for an M2 (M=Co, Ni, Fe, Zn) centre; Applications in ethylene oligomerisation. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.08.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Li J, Xi T, Yan B, Yang M, Song J, Ma H. Two Cu(ii) complexes of triadimefon: crystal structure, antifungal activities and structure–activity relationship. NEW J CHEM 2015. [DOI: 10.1039/c5nj00679a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theoretical investigations of the electronic structures of Cu(ii) complexes carried out by DFT calculations partially explained the increased biocidal properties.
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Affiliation(s)
- Jie Li
- Department of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
| | - Teng Xi
- Department of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
| | - Biao Yan
- Department of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
- Department of Chemistry and Chemical Engineering
| | - Mingyan Yang
- Department of Environmental Science and Engineering
- Chang'an University
- Xi'an
- China
| | - Jirong Song
- Department of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
- Conservation Technology Department
| | - Haixia Ma
- Department of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
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13
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Li J, Xi T, Yan B, Guan Y, Yang M, Song J, Ma H. Synergistic actions between tebuconazole ligand and Cu(ii) cation: reasons for the enhanced antifungal activity of four Cu(ii) complexes based on the fungicide tebuconazole. NEW J CHEM 2015. [DOI: 10.1039/c5nj01845e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enhanced antifungal activity of four synthesized complexes is due to the synergistic actions of tebuconazole ligand and Cu(ii) cation.
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Affiliation(s)
- Jie Li
- School of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
| | - Teng Xi
- School of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
| | - Biao Yan
- School of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
- Department of Chemistry and Chemical Engineering
| | - Yulei Guan
- School of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
| | - Mingyan Yang
- Department of Environmental Science and Engineering
- Chang'an University
- Xi'an
- China
| | - Jirong Song
- School of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
- Conservation Technology Department
| | - Haixia Ma
- School of Chemical Engineering
- Northwest University/Shaanxi Key Laboratory of Physico-Inorganic Chemistry
- Xi'an
- China
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14
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Kärkäs MD, Verho O, Johnston EV, Åkermark B. Artificial Photosynthesis: Molecular Systems for Catalytic Water Oxidation. Chem Rev 2014; 114:11863-2001. [DOI: 10.1021/cr400572f] [Citation(s) in RCA: 1024] [Impact Index Per Article: 102.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Markus D. Kärkäs
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Oscar Verho
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Eric V. Johnston
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Björn Åkermark
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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15
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Francàs L, González-Gil RM, Moyano D, Benet-Buchholz J, García-Antón J, Escriche L, Llobet A, Sala X. Dinuclear Ruthenium Complexes Containing the Hpbl Ligand: Synthesis, Characterization, Linkage Isomerism, and Epoxidation Catalysis. Inorg Chem 2014; 53:10394-402. [DOI: 10.1021/ic501483s] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laia Francàs
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
- Departament
de Química, Universitat Autònoma de Barcelona, Cerdanyola
del Vallès, 08193 Barcelona, Spain
| | - Rosa María González-Gil
- Departament
de Química, Universitat Autònoma de Barcelona, Cerdanyola
del Vallès, 08193 Barcelona, Spain
| | - Daniel Moyano
- Departament
de Química, Universitat Autònoma de Barcelona, Cerdanyola
del Vallès, 08193 Barcelona, Spain
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
| | - Jordi García-Antón
- Departament
de Química, Universitat Autònoma de Barcelona, Cerdanyola
del Vallès, 08193 Barcelona, Spain
| | - Lluís Escriche
- Departament
de Química, Universitat Autònoma de Barcelona, Cerdanyola
del Vallès, 08193 Barcelona, Spain
| | - Antoni Llobet
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
- Departament
de Química, Universitat Autònoma de Barcelona, Cerdanyola
del Vallès, 08193 Barcelona, Spain
| | - Xavier Sala
- Departament
de Química, Universitat Autònoma de Barcelona, Cerdanyola
del Vallès, 08193 Barcelona, Spain
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