1
|
Tomás FMA, Calvo NL, Vega NC, Vieyra FEM, Vega DR, Comedi D, Katz NE, Fagalde F. Syntheses, characterization, crystal structures and applications as sensitizers in solar cells of novel heteroleptic Cu(I) complexes containing nitrile-substituted 2,2'-bipyridyl ligands. Dalton Trans 2024; 53:808-819. [PMID: 38087997 DOI: 10.1039/d3dt02777e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Two novel Cu(I) tetradentate heteroleptic complexes, including nitrile-substituted bipyridines that can be anchored to semiconductor surfaces to be assembled in DSSCs, were synthesized and characterized by spectroscopic and electrochemical techniques. The crystal structures of both species were determined by X-ray diffraction. Results from DFT and TD-DFT calculations were found to be consistent with the experimental data. Emission at room temperature was observed for both complexes in the solid state, making them promising alternatives for the development of light-emitting diodes. We report for the first time the experimental evidence of photovoltaic conversion devices formed by Cu(I) complexes anchored to a TiO2 surface by means of nitrile groups present in substituted bipyridines, and subsequently tested as sensitizers for DSSCs, obtaining efficiency values for light to electrical energy conversion similar to those previously reported for analogous complexes with anchoring carboxylic groups.
Collapse
Affiliation(s)
- Federico M A Tomás
- INQUINOA (CONICET-UNT), Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI, San Miguel de Tucumán, Argentina.
| | - Natalia L Calvo
- IQUIR (CONICET-UNR) Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Santa Fe, Argentina
| | - Nadia C Vega
- INFINOA (CONICET-UNT) y Departamento de Física, Facultad de Ciencias Exactas y Tecnología, UNT, Av. Independencia 1800, T4002BLR, S. M. de Tucumán, Argentina
| | | | - Daniel R Vega
- Departamento Física de la Materia Condensada, GIyA, CAC, CNEA, Av. Gral. Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - David Comedi
- INFINOA (CONICET-UNT) y Departamento de Física, Facultad de Ciencias Exactas y Tecnología, UNT, Av. Independencia 1800, T4002BLR, S. M. de Tucumán, Argentina
| | - Néstor E Katz
- INQUINOA (CONICET-UNT), Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI, San Miguel de Tucumán, Argentina.
| | - Florencia Fagalde
- INQUINOA (CONICET-UNT), Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI, San Miguel de Tucumán, Argentina.
| |
Collapse
|
2
|
Abate PO, Peyrot AM, Fontrodona X, Romero I, Fagalde F, Katz NE. New ruthenium polypyridyl complexes as potential sensors of acetonitrile and catalysts for water oxidation. RSC Adv 2022; 12:8414-8422. [PMID: 35424825 PMCID: PMC8984912 DOI: 10.1039/d1ra09455f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/07/2022] [Indexed: 11/23/2022] Open
Abstract
New ruthenium(ii) polypyridyl complexes of formulae [RuCl(Me2Ntrpy)(bpy-OMe)]Cl, 1, and [Ru(Me2Ntrpy)(bpy-OMe)(OH2)](CF3SO3)2, 2, with Me2Ntrpy = 4′-N,N-dimethylamino-2,2′:6′,2′′-terpyridine and bpy-OMe = 4,4′-dimethoxy-2,2′-bipyridine, were synthetized and characterized by spectroscopic and electrochemical techniques. Besides, [Ru(Me2Ntrpy)(bpy-OMe)(NCCH3)]2+, 3, was obtained and characterized by UV-vis spectroscopy in acetonitrile solution. All experimental results were complemented with DFT and TD-DFT calculations. The complete structure of complex 1 was determined by X-ray diffraction, evidencing that the Ru–N and Ru–Cl bond lengths are longer than those determined in [RuCl(trpy)(bpy)](PF6). The strong electron donating properties of the substituents of both bpy and trpy rings in complexes 1 and 2 led to their potential applications for detecting traces of acetonitrile as a contaminant in aqueous solutions of radiopharmaceuticals and to utilization of complex 2 as a promising candidate for catalyzing water oxidation processes. New mononuclear polypyridyl Ru(ii) complexes were synthesized and fully characterized. These species can be potentially applied for detection of CH3CN as a contaminant in radiopharmaceuticals used in PET studies or for catalysing water oxidation.![]()
Collapse
Affiliation(s)
- Pedro O. Abate
- INQUINOA (CONICET-UNT), Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| | - Analía M. Peyrot
- INQUINOA (CONICET-UNT), Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| | - Xavier Fontrodona
- Serveis Tècnics de Recerca, Departament de Química, Universitat de Girona, C/M. Aurèlia Campmany, 69 E-17003 Girona, Spain
| | - Isabel Romero
- Serveis Tècnics de Recerca, Departament de Química, Universitat de Girona, C/M. Aurèlia Campmany, 69 E-17003 Girona, Spain
| | - Florencia Fagalde
- INQUINOA (CONICET-UNT), Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| | - Néstor E. Katz
- INQUINOA (CONICET-UNT), Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| |
Collapse
|
3
|
Salomón FF, Vega NC, Jurado JP, Morán Vieyra FE, Tirado M, Comedi D, Campoy-Quiles M, Cattaneo M, Katz NE. Heteroleptic Ruthenium(II) Complexes with 2,2'-Bipyridines Having Carbonitriles as Anchoring Groups for ZnO Surfaces: Syntheses, Physicochemical Properties, and Applications in Organic Solar Cells. Inorg Chem 2021; 60:5660-5672. [PMID: 33821633 DOI: 10.1021/acs.inorgchem.0c03691] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Heteroleptic ruthenium (II) complexes were used for sensitizing ZnO surfaces in organic solar cells (OSCs) as mediators with photoactive layers. The complexes [Ru(4,4'-X2-bpy)(Mebpy-CN)2]2+ (with X = -CH3, -OCH3 and -N(CH3)2; bpy = 2,2'-bipyridine; Mebpy-CN = 4-methyl-2,2'-bipyridine-4'-carbonitrile) were synthesized and studied by analytical and spectroscopical techniques. Spectroscopic, photophysical, and electrochemical properties were tuned by changing the electron-donating ability of the -X substituents at the 4,4'-positions of the bpy ring and rationalized by quantum mechanical calculations. These complexes were attached through nitrile groups to ZnO as interfacial layer in an OSC device with a PBDB-T:ITIC photoactive layer. This modified inorganic electron transport layer generates enhancement in photoconversion of the solar cells, reaching up to a 23% increase with respect to the unsensitized OSCs. The introduction of these dyes suppresses some degradative reactions of the nonfullerene acceptor due to the photocatalytic activity of zinc oxide, which was maintained stable for about 11 months. Improving OSC efficiencies and stabilities can thus be achieved by a judicious combination of new inorganic and organic materials.
Collapse
Affiliation(s)
- Fernando F Salomón
- INQUINOA (CONICET-UNT), Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| | - Nadia C Vega
- INFINOA (CONICET-UNT), NANOPROJECT, Depto. de Física, FACET, Universidad Nacional de Tucumán, Av. Independencia 1800, 4000 San Miguel de Tucumán, Argentina
| | - José Piers Jurado
- Instituto de Ciencia de Materiales de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, España
| | - Faustino E Morán Vieyra
- INBIONATEC (CONICET-UNSE), Laboratorio de Cinética y Fotoquímica, Universidad Nacional de Santiago del Estero, RN 9, Km 1125, 4206 Santiago del Estero, Argentina
| | - Mónica Tirado
- INFINOA (CONICET-UNT), NANOPROJECT, Depto. de Física, FACET, Universidad Nacional de Tucumán, Av. Independencia 1800, 4000 San Miguel de Tucumán, Argentina
| | - David Comedi
- INFINOA (CONICET-UNT), NANOPROJECT, Depto. de Física, FACET, Universidad Nacional de Tucumán, Av. Independencia 1800, 4000 San Miguel de Tucumán, Argentina
| | - Mariano Campoy-Quiles
- Instituto de Ciencia de Materiales de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, España
| | - Mauricio Cattaneo
- INQUINOA (CONICET-UNT), Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| | - Néstor E Katz
- INQUINOA (CONICET-UNT), Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| |
Collapse
|
4
|
Salomón F, Vega NC, Parella T, Morán Vieyra FE, Borsarelli CD, Longo C, Cattaneo M, Katz NE. Novel Heteroleptic Ruthenium(II) Complexes with 2,2'- Bipyridines Containing a Series of Electron-Donor and Electron-Acceptor Substituents in 4,4'-Positions: Syntheses, Characterization, and Application as Sensitizers for ZnO Nanowire-Based Solar Cells. ACS Omega 2020; 5:8097-8107. [PMID: 32309719 PMCID: PMC7161030 DOI: 10.1021/acsomega.0c00243] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 03/24/2020] [Indexed: 06/11/2023]
Abstract
A novel series of complexes of the formula [Ru(4,4'-X2-bpy)2(Mebpy-CN)](PF6)2 (X = -CH3, -OCH3, -N(CH3)2; Mebpy-CN = 4-methyl-2,2'-bipyridine-4'-carbonitrile) have been synthesized and characterized by spectroscopic, electrochemical, and photophysical techniques. Inclusion of the electron-withdrawing substituent -CN at one bpy ligand and different electron-donor groups -X at the 4,4'-positions of the other two bpy ligands produce a fine tuning of physicochemical properties. Redox potentials, electronic absorption maxima, and emission maxima correlate well with Hammett's σp parameters of X. Quantum mechanical calculations are consistent with experimental data. All the complexes can be anchored through the nitrile moiety of Mebpy-CN over ZnO nanowires in dye-sensitized solar cells that exhibit an improvement of light to electrical energy conversion efficiency as the electronic asymmetry increases in the series.
Collapse
Affiliation(s)
- Fernando
F. Salomón
- INQUINOA
(UNT- CONICET), Instituto de Química Física, Facultad
de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, (T4000INI) San Miguel de Tucumán, Argentina
| | - Nadia C. Vega
- INQUINOA
(UNT- CONICET), Instituto de Química Física, Facultad
de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, (T4000INI) San Miguel de Tucumán, Argentina
| | - Teodor Parella
- Servei
de RMN, Universitat Autonóma de Barcelona, Bellaterra E-08193, Barcelona, Spain
| | - Faustino Eduardo Morán Vieyra
- INBIONATEC
(UNSE-CONICET), Universidad Nacional de
Santiago del Estero, RN 9, Km 1125,
(4206) Santiago del Estero, Argentina
| | - Claudio D. Borsarelli
- INBIONATEC
(UNSE-CONICET), Universidad Nacional de
Santiago del Estero, RN 9, Km 1125,
(4206) Santiago del Estero, Argentina
| | - Claudia Longo
- Institute
of Chemistry, University of Campinas, UNICAMP, C. Postal 6154, 13083-970 Campinas, Sao Paulo, Brazil
| | - Mauricio Cattaneo
- INQUINOA
(UNT- CONICET), Instituto de Química Física, Facultad
de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, (T4000INI) San Miguel de Tucumán, Argentina
| | - Néstor E. Katz
- INQUINOA
(UNT- CONICET), Instituto de Química Física, Facultad
de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, (T4000INI) San Miguel de Tucumán, Argentina
| |
Collapse
|
5
|
Abate PO, Pourrieux G, Morán Vieyra FE, Borsarelli CD, Parella T, Vergara MM, Katz NE. A novel mononuclear complex of 4,4″-azobis-(2,2′-bipyridine) coordinated to tetracyanoruthenium(II) can behave as a “molecular switch”. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.114149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
6
|
Mecchia Ortiz JH, Peyrot AM, Fagalde F, Katz NE. Trans-kinetic effects in ligand substitution processes of ruthenium polypyridyl complexes. INORG CHEM COMMUN 2018. [DOI: 10.1016/j.inoche.2018.09.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
7
|
Abate PO, Pourrieux G, Morán Vieyra FE, Cattaneo M, Vergara MM, Katz NE. A new molecular switch based on a symmetrical dinuclear complex of two tricarbonylrhenium(I) moieties bridged by 4,4″-azobis-(2,2′-bipyridine). Polyhedron 2018. [DOI: 10.1016/j.poly.2018.04.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
8
|
Martos GG, Mamani A, Filippone MP, Abate PO, Katz NE, Castagnaro AP, Díaz Ricci JC. Ellagitannin HeT obtained from strawberry leaves is oxidized by bacterial membranes and inhibits the respiratory chain. FEBS Open Bio 2018; 8:211-218. [PMID: 29435411 PMCID: PMC5794468 DOI: 10.1002/2211-5463.12361] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 11/22/2017] [Accepted: 11/23/2017] [Indexed: 01/15/2023] Open
Abstract
Plant secondary metabolism produces a variety of tannins that have a wide range of biological activities, including activation of plant defenses and antimicrobial, anti‐inflammatory and antitumoral effects. The ellagitannin HeT (1‐O‐galloyl‐2,3;4,6‐bis‐hexahydroxydiphenoyl‐β‐d‐glucopyranose) from strawberry leaves elicits a strong plant defense response, and exhibits antimicrobial activity associated to the inhibition of the oxygen consumption, but its mechanism of action is unknown. In this paper we investigate the influence of HeT on bacterial cell membrane integrity and its effect on respiration. A β‐galactosidase unmasking experiment showed that HeT does not disrupt membrane integrity. Raman spectroscopy analysis revealed that HeT strongly interacts with the cell membrane. Spectrochemical analysis indicated that HeT is oxidized in contact with bacterial cell membranes, and functional studies showed that HeT inhibits oxygen consumption, NADH and MTT reduction. These results provide evidence that HeT inhibits the respiratory chain.
Collapse
Affiliation(s)
- Gustavo G Martos
- INSIBIO (CONICET-UNT) and Instituto de Química Biológica San Miguel de Tucuman Argentina
| | - Alicia Mamani
- INSIBIO (CONICET-UNT) and Instituto de Química Biológica San Miguel de Tucuman Argentina
| | - María P Filippone
- Sección Biotecnología de la Estación Experimental Agroindustrial Obispo Colombres (EEAOC) Tucumán Argentina
| | - Pedro O Abate
- INQUINOA (UNT-CONICET) Facultad de Bioquímica Química y Farmacia Universidad Nacional de Tucumán Argentina
| | - Néstor E Katz
- INQUINOA (UNT-CONICET) Facultad de Bioquímica Química y Farmacia Universidad Nacional de Tucumán Argentina
| | - Atilio P Castagnaro
- Sección Biotecnología de la Estación Experimental Agroindustrial Obispo Colombres (EEAOC) Tucumán Argentina
| | - Juan C Díaz Ricci
- INSIBIO (CONICET-UNT) and Instituto de Química Biológica San Miguel de Tucuman Argentina
| |
Collapse
|
9
|
Mecchia Ortiz JH, Katz NE. Modulation of the absorption properties of a novel iron trisbipyridyl complex by introducing peripheral ruthenium ammines. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.06.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
10
|
Cattaneo M, Alborés P, Fagalde F, Katz NE. Strong metal-to-ligand π-backbonding weakens the N N bond in 2-pyridinealdazine coordinated to tetraammine-ruthenium(II). INORG CHEM COMMUN 2017. [DOI: 10.1016/j.inoche.2017.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
11
|
Giménez RE, Vargová V, Rey V, Turbay MBE, Abatedaga I, Morán Vieyra FE, Paz Zanini VI, Mecchia Ortiz JH, Katz NE, Ostatná V, Borsarelli CD. Interaction of singlet oxygen with bovine serum albumin and the role of the protein nano-compartmentalization. Free Radic Biol Med 2016; 94:99-109. [PMID: 26898504 DOI: 10.1016/j.freeradbiomed.2016.02.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Revised: 02/13/2016] [Accepted: 02/15/2016] [Indexed: 12/30/2022]
Abstract
Singlet molecular oxygen ((1)O2) contributes to protein damage triggering biophysical and biochemical changes that can be related with aging and oxidative stress. Serum albumins, such as bovine serum albumin (BSA), are abundant proteins in blood plasma with different biological functions. This paper presents a kinetic and spectroscopic study of the (1)O2-mediated oxidation of BSA using the tris(2,2'-bipyridine)ruthenium(II) cation [Ru(bpy)3](2+) as sensitizer. BSA quenches efficiently (1)O2 with a total (chemical+physical interaction) rate constant kt(BSA)=7.3(±0.4)×10(8)M(-1)s(-1), where the chemical pathway represented 37% of the interaction. This efficient quenching by BSA indicates the participation of several reactive residues. MALDI-TOF MS analysis of intact BSA confirmed that after oxidation by (1)O2, the mass protein increased the equivalent of 13 oxygen atoms. Time-resolved emission spectra analysis of BSA established that Trp residues were oxidized to N'-formylkynurenine, being the solvent-accessible W134 preferentially oxidized by (1)O2 as compared with the buried W213. MS confirmed oxidation of at least two Tyr residues to form dihydroxyphenylalanine, with a global reactivity towards (1)O2 six-times lower than for Trp residues. Despite the lack of MS evidences, kinetic and chemical analysis also suggested that residues other than Trp and Tyr, e.g. Met, must react with (1)O2. Modeling of the 3D-structure of BSA indicated that the oxidation pattern involves a random distribution of (1)O2 into BSA; allowing also the interaction of (1)O2 with buried residues by its diffusion from the bulk solvent through interconnected internal hydrophilic and hydrophobic grooves.
Collapse
Affiliation(s)
- Rodrigo E Giménez
- Instituto de Bionanotecnología, INBIONATEC-CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, Km 1125, G4206XCP Santiago del Estero, Argentina
| | - Veronika Vargová
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Královopolská 135, 612 65 Brno, Czech Republic
| | - Valentina Rey
- Instituto de Bionanotecnología, INBIONATEC-CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, Km 1125, G4206XCP Santiago del Estero, Argentina
| | - M Beatriz Espeche Turbay
- Instituto de Bionanotecnología, INBIONATEC-CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, Km 1125, G4206XCP Santiago del Estero, Argentina
| | - Inés Abatedaga
- Instituto de Bionanotecnología, INBIONATEC-CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, Km 1125, G4206XCP Santiago del Estero, Argentina
| | - Faustino E Morán Vieyra
- Instituto de Bionanotecnología, INBIONATEC-CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, Km 1125, G4206XCP Santiago del Estero, Argentina
| | - Verónica I Paz Zanini
- Instituto de Bionanotecnología, INBIONATEC-CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, Km 1125, G4206XCP Santiago del Estero, Argentina
| | - Juan H Mecchia Ortiz
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI San Miguel de Tucumán, Argentina
| | - Néstor E Katz
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI San Miguel de Tucumán, Argentina
| | - Veronika Ostatná
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Královopolská 135, 612 65 Brno, Czech Republic
| | - Claudio D Borsarelli
- Instituto de Bionanotecnología, INBIONATEC-CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, Km 1125, G4206XCP Santiago del Estero, Argentina.
| |
Collapse
|
12
|
Pourrieux G, Abate PO, Vergara MM, Katz NE. Redox-induced linkage isomerization detected in [Ru(NH3)5(NVF)](PF6)2(NVF=N-vinylformamide). INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.02.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
13
|
Mecchia Ortiz JH, Longo C, Katz NE. Polypyridyl ruthenium complexes containing anchoring nitrile groups as TiO2 sensitizers for application in solar cells. INORG CHEM COMMUN 2015. [DOI: 10.1016/j.inoche.2015.03.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
14
|
Mecchia Ortiz JH, Morán Vieyra FE, Borsarelli CD, Romero I, Fontrodona X, Parella T, Lis de Katz ND, Fagalde F, Katz NE. Mono‐ and Dinuclear Complexes of Tricarbonylrhenium(I) with 4‐Methyl‐2,2′‐bipyridine‐4′‐carbonitrile. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402160] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Juan H. Mecchia Ortiz
- INQUINOA‐CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI San Miguel de Tucumán, Argentina, http://www.inquinoa.org.ar
| | - Faustino E. Morán Vieyra
- Laboratorio de Cinética y Fotoquímica, Centro de Investigaciones y Transferencia de Santiago del Estero (CITSE‐CONICET), Universidad Nacional de Santiago del Estero, RN 9, Km 1125, 4206 Santiago del Estero, Argentina
| | - Claudio D. Borsarelli
- Laboratorio de Cinética y Fotoquímica, Centro de Investigaciones y Transferencia de Santiago del Estero (CITSE‐CONICET), Universidad Nacional de Santiago del Estero, RN 9, Km 1125, 4206 Santiago del Estero, Argentina
| | - Isabel Romero
- Departament de Química and Serveis Tècnics de Recerca, Universitat de Girona, Campus de Montilivi, 17071 Girona, Spain
| | - Xavier Fontrodona
- Departament de Química and Serveis Tècnics de Recerca, Universitat de Girona, Campus de Montilivi, 17071 Girona, Spain
| | - Teodor Parella
- Servei de RMN, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
| | - Noemí D. Lis de Katz
- INQUINOA‐CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI San Miguel de Tucumán, Argentina, http://www.inquinoa.org.ar
| | - Florencia Fagalde
- INQUINOA‐CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI San Miguel de Tucumán, Argentina, http://www.inquinoa.org.ar
| | - Néstor E. Katz
- INQUINOA‐CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI San Miguel de Tucumán, Argentina, http://www.inquinoa.org.ar
| |
Collapse
|
15
|
Cattaneo M, Vergara MM, García Posse ME, Fagalde F, Parella T, Katz NE. Spectroscopic, electrochemical and computational studies of rhenium(I) and ruthenium(II) complexes incorporating the novel tetradentate ligand 1,4-bis(4-(4′-methyl)-2,2′-bipyridyl)-2,3-diaza-1,3-butadiene (BBDB) and its derivatives. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
16
|
Ortiz JHM, Vega N, Comedi D, Tirado M, Romero I, Fontrodona X, Parella T, Vieyra FEM, Borsarelli CD, Katz NE. Improving the Photosensitizing Properties of Ruthenium Polypyridyl Complexes Using 4-Methyl-2,2′-bipyridine-4′-carbonitrile as an Auxiliary Ligand. Inorg Chem 2013; 52:4950-62. [DOI: 10.1021/ic302594b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Juan H. Mecchia Ortiz
- INQUINOA-CONICET,
Instituto de Química Física, Facultad de Bioquímica,
Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| | - Nadia Vega
- LAFISO and LPDM, Facultad de
Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, Avda. Independencia 1800, (T4002BLR)
San Miguel de Tucumán, Argentina
| | - David Comedi
- LAFISO and LPDM, Facultad de
Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, Avda. Independencia 1800, (T4002BLR)
San Miguel de Tucumán, Argentina
| | - Mónica Tirado
- LAFISO and LPDM, Facultad de
Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, Avda. Independencia 1800, (T4002BLR)
San Miguel de Tucumán, Argentina
| | - Isabel Romero
- Departament de Química and Serveis Tècnics
de Recerca (STR), Universitat de Girona, Campus de Montilivi, E-17071 Girona, Spain
| | - Xavier Fontrodona
- Departament de Química and Serveis Tècnics
de Recerca (STR), Universitat de Girona, Campus de Montilivi, E-17071 Girona, Spain
| | - Teodor Parella
- Servei de RMN, Universitat Autònoma de Barcelona, Bellaterra E-08193, Barcelona, Spain
| | - F. Eduardo Morán Vieyra
- Laboratorio de Cinética
y Fotoquímica, Centro de Investigaciones y Transferencia de
Santiago del Estero (CITSE-CONICET), Universidad Nacional de Santiago del Estero, RN 9, Km 1125, (4206) Santiago
del Estero, Argentina
| | - Claudio D. Borsarelli
- Laboratorio de Cinética
y Fotoquímica, Centro de Investigaciones y Transferencia de
Santiago del Estero (CITSE-CONICET), Universidad Nacional de Santiago del Estero, RN 9, Km 1125, (4206) Santiago
del Estero, Argentina
| | - Néstor E. Katz
- INQUINOA-CONICET,
Instituto de Química Física, Facultad de Bioquímica,
Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| |
Collapse
|
17
|
Morán Vieyra FE, Cattaneo M, Fagalde F, Bozoglián F, Llobet A, Katz NE. Influence of the linker length on the host–guest properties of alkoxy- and polypyridine-bridged molecular rectangles of formulae {[Re(CO)3(OC5H11)]4(L)2}, with L=4-pyridinealdazine and 4,4′-azobis(pyridine). Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.02.075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
18
|
Pourrieux G, Fagalde F, Romero I, Fontrodona X, Parella T, Katz NE. Electron-, Proton-, and Photon-Induced Spectroscopic Changes in Chromophore-Quencher Tricarbonyl(2,2′-Bipyridine)rhenium(I) Complexes with 4,4′-Azobis(pyridine). Inorg Chem 2010; 49:4084-91. [DOI: 10.1021/ic901893q] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gaston Pourrieux
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| | - Florencia Fagalde
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| | - Isabel Romero
- Departament de Química and Serveis Tècnics de Recerca (STR), Universitat de Girona, Campus de Montilivi, E-17071 Girona, Spain
| | - Xavier Fontrodona
- Departament de Química and Serveis Tècnics de Recerca (STR), Universitat de Girona, Campus de Montilivi, E-17071 Girona, Spain
| | - Teodor Parella
- Servei de RMN, Universitat Autònoma de Barcelona, Bellaterra E-08193, Barcelona, Spain
| | - Néstor E. Katz
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| |
Collapse
|
19
|
Cattaneo M, Fagalde F, Borsarelli CD, Katz NE. Improvement of the Dynamic Range of pH Sensing by Using a Luminescent Tricarbonylpolypyridylrhenium(I) Complex with Three Different Protonation Sites. Inorg Chem 2009; 48:3012-7. [DOI: 10.1021/ic802203d] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mauricio Cattaneo
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina, and INQUINOA-CONICET, Instituto de Ciencias Químicas, Facultad de Agronomía y Agroindustrias, Universidad Nacional de Santiago del Estero, Av. Belgrano (S) 1912, G4200ABT, Santiago del Estero, Argentina
| | - Florencia Fagalde
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina, and INQUINOA-CONICET, Instituto de Ciencias Químicas, Facultad de Agronomía y Agroindustrias, Universidad Nacional de Santiago del Estero, Av. Belgrano (S) 1912, G4200ABT, Santiago del Estero, Argentina
| | - Claudio D. Borsarelli
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina, and INQUINOA-CONICET, Instituto de Ciencias Químicas, Facultad de Agronomía y Agroindustrias, Universidad Nacional de Santiago del Estero, Av. Belgrano (S) 1912, G4200ABT, Santiago del Estero, Argentina
| | - Néstor E. Katz
- INQUINOA-CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina, and INQUINOA-CONICET, Instituto de Ciencias Químicas, Facultad de Agronomía y Agroindustrias, Universidad Nacional de Santiago del Estero, Av. Belgrano (S) 1912, G4200ABT, Santiago del Estero, Argentina
| |
Collapse
|
20
|
Pourrieux G, Fagalde F, Katz NE, Parella T, Benet-Buchholz J, Llobet A. Synthesis, spectroscopic and electrochemical characterization and molecular structure of polypyridyl ruthenium complexes containing 4,4′-azobis(pyridine). Polyhedron 2008. [DOI: 10.1016/j.poly.2008.06.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
21
|
Cattaneo M, Fagalde F, Katz NE, Borsarelli CD, Parella T. pH-Induced Luminescence Changes of Chromophore-Quencher Tricarbonylpolypyridylrhenium(I) Complexes with 4-Pyridinealdazine. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200700860] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
22
|
Cattaneo M, Fagalde F, Katz NE, Borsarelli CD, Parella T. pH-Induced Luminescence Changes of Chromophore-Quencher Tricarbonylpolypyridylrhenium(I) Complexes with 4-Pyridinealdazine (Eur. J. Inorg. Chem. 34/2007). Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200790089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
23
|
Fagalde F, Posse MEG, Vergara MM, Cattaneo M, Katz NE, Romero I, Parella T, Llobet A. Increasing transmission of electronic interaction in dinuclear unsymmetric mixed-valent ruthenium complexes. Polyhedron 2007. [DOI: 10.1016/j.poly.2006.07.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
24
|
Affiliation(s)
- Florencia Fagalde
- a Instituto de Química Física , Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán , Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| | - María Gabriela Mellace
- a Instituto de Química Física , Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán , Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| | - Noemí D. Lis de Katz
- a Instituto de Química Física , Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán , Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| | - Néstor E. Katz
- a Instituto de Química Física , Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán , Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina
| |
Collapse
|
25
|
Cattaneo M, Fagalde F, Katz NE. Proton-Induced Luminescence of Mono- and Dinuclear Rhenium(I) Tricarbonyl Complexes Containing 4-Pyridinealdazine. Inorg Chem 2006; 45:6884-91. [PMID: 16903746 DOI: 10.1021/ic060287m] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
New mono- and dinuclear rhenium(I) tricarbonyls, of formulas [Re(bpy)(CO)3(PCA)]+ (1), [(bpy)(CO)3Re(I)(PCA)Re(I)(CO)3(bpy)]2+ (2), and [(bpy)(CO)3Re(I)(PCA)Ru(II)(NH3)5]3+ (3) (bpy = 2,2'-bipyridine, PCA = 4-pyridinecarboxaldehydeazine), have been synthesized as PF6- salts and characterized by spectroscopic, electrochemical, and photophysical techniques. These species do not emit at room temperature in CH(3)CN; however, in aqueous solutions, a decrease in pH induces luminescence in all of them, due to protonation of one of the N atoms of the -C=N-N=C- chain of PCA, as indicated by the pKa values of the ground states, obtained by absorption measurements, which are ca. 3 orders of magnitude lower than the pKa value of the pyridine N of PCA in complex 1. On the other hand, the values of pKa* of the excited states, obtained by emission measurements, of complexes 1 and 2 are similar (pKa* = 2.7 +/- 0.1 at I = 0.1 M) and higher than those of the corresponding ground states. At low values of pH, chemical decomposition takes place rapidly in complex 3, but not in 1 and 2, supporting the possible use of these latter species as luminescent sensors of pH. The heterodinuclear complex, of formula [(bpy)(CO)3Re(I)(PCA)Ru(III)(NH3)5]4+, was obtained by bromine oxidation of the [Re(I), Ru(II)] precursor in CH3CN solution; from spectral and electrochemical measurements, the recombination charge-transfer reaction [Re(II), Ru(II) ] --> [Re(I), Ru(III)], which occurs after photoexcitation, is predicted to lie in the Marcus inverted region.
Collapse
Affiliation(s)
- Mauricio Cattaneo
- Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucuman, Ayacucho 491, T4000INI San Miguel de Tucumán, Argentina
| | | | | |
Collapse
|
26
|
Mellace MG, Fagalde F, Katz NE, Hester HR, Schmehl R. Photophysical properties of the photosensitizer [Ru(bpy)2(5-CNphen)]2+ and intramolecular quenching by complexation of Cu(II). J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2005.10.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
27
|
Cattaneo M, Fagalde F, Katz NE, Leiva AM, Schmehl R. Enhancement of Metal−Metal Coupling at a Considerable Distance by Using 4-Pyridinealdazine as a Bridging Ligand in Polynuclear Complexes of Rhenium and Ruthenium. Inorg Chem 2005; 45:127-36. [PMID: 16390048 DOI: 10.1021/ic051312b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Novel polynuclear complexes of rhenium and ruthenium containing PCA (PCA = 4-pyridinecarboxaldehyde azine or 4-pyridinealdazine or 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene) as a bridging ligand have been synthesized as PF(6-) salts and characterized by spectroscopic, electrochemical, and photophysical techniques. The precursor mononuclear complex, of formula [Re(Me(2)bpy)(CO)(3)(PCA)](+) (Me(2)bpy = 4,4'-dimethyl-2,2'-bipyridine), does not emit at room temperature in CH(3)CN, and the transient spectrum found by flash photolysis at lambda(exc) = 355 nm can be assigned to a MLCT (metal-to-ligand charge transfer) excited state [(Me(2)bpy)(CO)(3)Re(II)(PCA(-))](+), with lambda(max) = 460 nm and tau < 10 ns. The spectral properties of the related complexes [[Re(Me(2)bpy)(CO)(3)}(2)(PCA)](2+), [Re(CO)(3)(PCA)(2)Cl], and [Re(CO)(3)Cl](3)(PCA)(4) confirm the existence of this low-energy MLCT state. The dinuclear complex, of formula [(Me(2)bpy)(CO)(3)Re(I)(PCA)Ru(II)(NH(3))(5)](3+), presents an intense absorption in the visible spectrum that can be assigned to a MLCT d(pi)(Ru) --> pi(PCA); in CH(3)CN, the value of lambda (max) = 560 nm is intermediate between those determined for [Ru(NH(3))(5)(PCA)](2+) (lambda(max) = 536 nm) and [(NH(3))(5)Ru(PCA)Ru(NH(3))(5)](4+) (lambda(max) = 574 nm), indicating a significant decrease in the energy of the pi-orbital of PCA. The mixed-valent species, of formula [(Me(2)bpy)(CO)(3)Re(I)(PCA)Ru(III)(NH(3))(5)](4+), was obtained in CH(3)CN solution, by bromine oxidation or by controlled-potential electrolysis at 0.8 V in a OTTLE cell of the [Re(I),Ru(II)] precursor; the band at lambda(max) = 560 nm disappears completely, and a new band appears at lambda(max) = 483 nm, assignable to a MMCT band (metal-to-metal charge transfer) Re(I) --> Ru(III). By using the Marcus-Hush formalism, both the electronic coupling (H(AB)) and the reorganization energy (lambda) for the metal-to-metal intramolecular electron transfer have been calculated. Despite the considerable distance between both metal centers (approximately 15.0 Angstroms), there is a moderate coupling that, together with the comproportionation constant of the mixed-valent species [(NH(3))(5)Ru(PCA)Ru(NH(3))(5)](5+) (K(c) approximately 10(2), in CH(3)CN), puts into evidence an unusual enhancement of the metal-metal coupling in the bridged PCA complexes. This effect can be accounted for by the large extent of "metal-ligand interface", as shown by DFT calculations on free PCA. Moreover, lambda is lower than the driving force -DeltaG degrees for the recombination charge reaction [Re(II),Ru(II)] --> [Re(I),Ru(III)] that follows light excitation of the mixed-valent species. It is then predicted that this reverse reaction falls in the Marcus inverted region, making the heterodinuclear [Re(I),Ru(III)] complex a promising model for controlling the efficiency of charge-separation processes.
Collapse
Affiliation(s)
- Mauricio Cattaneo
- Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, (T4000INI) San Miguel de Tucumán, Argentina
| | | | | | | | | |
Collapse
|
28
|
Mellace MG, Fagalde F, Katz NE, Crivelli IG, Delgadillo A, Leiva AM, Loeb B, Garland MT, Baggio R. Dinuclear Asymmetric Ruthenium Complexes with 5-Cyano-1,10-phenanthroline as a Bridging Ligand. Inorg Chem 2004; 43:1100-7. [PMID: 14753833 DOI: 10.1021/ic035198d] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New dinuclear asymmetric ruthenium complexes of the type [(bpy)(2)Ru(5-CNphen)Ru(NH(3))(5)](4+/5+) (bpy = 2,2'-bipyridine; 5-CNphen = 5-cyano-1,10-phenanthroline) have been synthesized and characterized by spectroscopic, electrochemical, and photophysical techniques. The structure of the cation [(bpy)(2)Ru(5-CNphen)Ru(NH(3))(5)](4+) has been determined by X-ray diffraction. The mononuclear precursor [Ru(bpy)(2)(5-CNphen)](2+) has also been prepared and studied; while its properties as a photosensitizer are similar to those of [Ru(bpy)(3)](2+), its luminescence at room temperature is quenched by a factor of 5 in the mixed-valent species [(bpy)(2)Ru(II)(5-CNphen)Ru(III)(NH(3))(5)](5+), pointing to the occurrence of intramolecular electron-transfer processes that follow light excitation. From spectral data for the metal-to-metal charge-transfer transition Ru(II) --> Ru(III) in this latter complex, a slight electronic interaction (H(AB) = 190 cm(-1)) is disclosed between both metallic centers through the bridging 5-CNphen.
Collapse
Affiliation(s)
- María G Mellace
- Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Republic of Argentina
| | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Glöckle M, Katz NE, Ketterle M, Kaim W. Qualitatively and quantitatively different solvatochromism of the MLCT and MMCT absorption bands of centrosymmetric acceptor-bridged diiron(II,II) and diiron(III,II) cyanide complexes. Inorganica Chim Acta 2002. [DOI: 10.1016/s0020-1693(02)00846-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
30
|
Glöckle M, Kaim W, Katz NE, García Posse M, Cutin EH, Fiedler J. The Fe(III)/Fe(II) vs Fe(2)(2.5) Formulation in Mixed-Valent Species [(NC)(4)Fe(BL)Fe(CN)(4)](3)(-), BL = 2,2'-Bipyrimidine and 3,6-Bis(2-pyridyl)-1,2,4,5-tetrazine. Distance and Size Do Not Always Matter. Inorg Chem 1999; 38:3270-3274. [PMID: 11671059 DOI: 10.1021/ic990249l] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two molecule-bridged bis(tetracyanoiron) complexes [(NC)(4)Fe(BL)Fe(CN)(4)](n)()(-), BL = 2,2'-bipyrimidine (bpym) and 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine (bptz), were studied by EPR, UV/vis/near-IR and IR spectroelectrochemistry (n = 2-5) in aprotic media. Following these results, the Fe(2)(2.5) formulation is the correct valence description for the metal centers in the bptz-bridged trianion (K(c) = 10(14.6) in CH(3)CN), whereas the localized Fe(III)/Fe(II) formulation is appropriate for the bpym-bridged system (K(c) = 10(5.4) in CH(3)CN and 10(6.4) in CH(2)Cl(2)). In contrast to common perception, the larger tetrazine-bridged system with the longer metal-metal distance exhibits much stronger metal-metal coupling than the bpym-bridged analogue, a consequence of the very low lying pi LUMO of tetrazines with high MO coefficients at the coordinating nitrogen centers.
Collapse
Affiliation(s)
- Markus Glöckle
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 18223 Prague, Czech Republic
| | | | | | | | | | | |
Collapse
|
31
|
Baumann F, Kaim W, García Posse M, Katz NE. Spectroelectrochemistry of the Multistep Redox System {(μ-bpym)[Ru(NH3)4]2}n+, n = 2−6, in a Nonaqueous Medium. Inorg Chem 1998. [DOI: 10.1021/ic971143y] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
32
|
Ben Altabef A, Ribotta de Gallo SB, Folquer ME, Katz NE. Dinuclear complexes of (2,2′-bipyridine)(2,2′:6′,2′'-terpyridine)-ruthenium(II) bonded through cyanide to pentaammineruthenium(II/III) groups. TRANSIT METAL CHEM 1993. [DOI: 10.1007/bf00207956] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
33
|
Fagalde F, Katz NE. Preparation and spectroscopic, electrochemical and photophysical properties of mono-, di-nuclear and mixed-valence species derived from the photosensitizing group (2,2′-bipyridine)(2,2′:6′,2″-terpyridine)ruthenium(II). ACTA ACUST UNITED AC 1993. [DOI: 10.1039/dt9930000571] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
34
|
Altabef AB, Ribotta de Gallo SB, Folquer ME, Katz NE. Syntheses and characterization of new mononuclear and dinuclear complexes derived from ruthenium polypyridines. Inorganica Chim Acta 1991. [DOI: 10.1016/s0020-1693(00)80919-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
35
|
|
36
|
Altabef AB, Brandán SA, Katz NE. Synthesis and spectral properties of a new binuclear iron complex: The ion tetracyano(4-cyanopyridine) ferrate(II)-μ-cyano-pentacyanoferrate(II). Polyhedron 1985. [DOI: 10.1016/s0277-5387(00)84494-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
37
|
Katz NE, Blesa MA, Olabe J, Aymonino PJ. The mechanism of the reactions of pentacyanonitrosylferrate(II) with ammonia and ethylenediamine. ACTA ACUST UNITED AC 1980. [DOI: 10.1016/0022-1902(80)80089-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
38
|
Pedrosa GC, Hernández NL, Katz NE, Katz M. Notes. Salt effects on the kinetics of substitution of the pentacyano(pyrrolidine)ferrate(II) ion. ACTA ACUST UNITED AC 1980. [DOI: 10.1039/dt9800002297] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|