Loeb L., Bárbara

Profesor Titular Honorario

email bloeb@uc.cl

phone (56) 22354 4404

Doctor en Ciencias Químicas, mención Química.
Universidad de Chile, 1985

Perfil en ORCID

Áreas o líneas de investigación:
Fisicoquímica Inorgánica. Síntesis, estudio de propiedades fisicoquimicas y potenciales aplicaciones (por ej. en celdas solares), de complejos de metales de transición.

Investigación actual:
La investigación abordada se centra en el diseño, síntesis, caracterización y estudio de propiedades de complejos polipiridínicos de metales de transición, con miras a su potencial aplicación como tinturas de celdas solares fotoelectroquímicas, o en dispositivos LED o de respuesta óptica no lineal. La metodología de trabajo involucra tanto experimentos como cálculos moleculares, y se centra principalmente en metales como Ru, Re y Cu.

QIM100     Química General
QIM100i    Química General 
QIM100I    Química General I
QIM106A   Química Inorgánica I
QIM107A   Química Inorgánica II
QIM108A   Química Inorgánica III
QPG3251 Química Inorgánica Avanzada
Sintesis Inorgánica Avanzada

2007 - 2011:
Complejos de Materiales de Transición con Ligandos Nitrógeno-Heterociclicos: diseño, Síntesis Cálculos Molecualres, con miras a su Aplicación en Celdas Solares, Optica no Lineal, y Dispositivos Emisores de Luz (LED). Investigador responsable, Proyecto Fondecyt Nº1070799

2008 - 2010:
Alternative Iodine-Free Redox Mediator for Dye-Sensitized Photovoltaic Cells. Investigador patrocinante, Postdoctorante: Francisco Gajardo, 
Proyecto Fondecyt Nº3090026

2007 - 2008:
Complejos de Materiales de Transición con Ligandos Nitrógeno-Heterociclicos: Diseño, Síntesis y Cálculos Moleculares con miras a su Aplicación en Celdas Solares, Optica no lineal, y Dispositivos Emisores de luz (LED). Investigador responsable, Colaboración Internacional, Proyecto Fondecyt N°7070181.

2002 - 2006:
Complejos Inorgánicos como Tinturas para Celdas Solares: Estudios Básicos y Pruebas de Aplicación. Investigador responsable, Proyecto Fondecyt Nº1020517.

Barrera, M., Ardo, S., Crivelli, I, Loeb, B, Meyer, G.J.. The role of lithium cations on the photochemistry of ruthenium complexes in dye-sensitized solar cells: A TDDFT study with the BCL model. Journal Of Photochemistry And Photobiology A-Chemistry. 2018;364:510-515.

Gonzalez I , Natali M , Cabrera AR, Loeb B, Maze J , Dreyse P . Substituent influence in phenanthroline-derived ancillary ligands on the excited state nature of novel cationic Ir(III) complexes. New Journal Of Chemistry. 2018;42(9):6644-6654.

Sanhueza L, Cortes D, Ledoux I, Crivelli I , Loeb B . Nonlinear optical response of octupolar Zn(II) complexes incorporating highly aromatic polypyridinic ligands: Insights into the role of the metal center. Synthetic Metals. 2017;234:9-17.

Barrera M, Crivelli I, Loeb B. On the performance of ruthenium dyes in dye sensitized solar cells: a free cluster approach based on theoretical indexes. Journal Of Molecular Modeling. 2016;22(5):1-15.

Dreyse P, Gonzalez I, Cortes D, Ramirez O, Salas I, Gonzalez A, Toro A, Loeb B. New cyclometalated Ir(III) complexes with bulky ligands with potential applications in LEC devices: experimental and theoretical studies of their photophysical properties. New Journal Of Chemistry. 2016;40(7):6253-6263.

Iturbe C, Loeb B, Barrera M, Brito I, Canete A. Design and synthesis of non-symmetric phenylpyridine type ligands. Experimental and theoretical studies of their corresponding iridium complexes. Polyhedron. 2016;118:159-170.

Gonzalez I , Cortes D , Dreyse P, Sanhueza L , Ledoux I, Andrade D , Brito I , Toro A, Soto M, Caramori S, Loeb B. A Family of Ir-III Complexes with High Nonlinear Optical Response and Their Potential Use in Light-Emitting Devices. European Journal Of Inorganic Chemistry. 2015;(29):4946-4955.

Gonzalez I , Dreyse P, Cortes D, Sundararajan M, Morgado C , Brito I, Roldan C, Bolink H, Loeb B. A comparative study of Ir(III) complexes with pyrazino[2,3-f][1,10]phenanthroline and pyrazino[2,3-f][4,7]phenanthroline ligands in light-emitting electrochemical cells (LECs). Dalton Transactions. 2015;44(33):14771-14781."

C. Zúñiga, I. Crivelli, B. Loeb. Synthesis, characterization, spectroscopic and electrochemical studies of donor-acceptor ruthenium (II) polypyridine ligand derivatives with potential NLO applications. Polyhedron. (85), 511-518 (2015). 

F. Angel, B. Loeb. Study of the effect of aliphatic and pi-conjugated systems on the photophysical properties of polypyridinic Ruthenium II complexes as potential semiconductor materials for iTMC type LEC. Inorganica Chimica Acta. 421:255-259 (2014).

P. Dreyse, B. Loeb, M. Barrera, I. González. Anomalous behavior of ir (iii) cyclometalated complexes. Application in light-emitting electrochemical cells. Journal Of The Chilean Chemical Society. 59(3):2628-2631 (2014). 

A. Francois,R. Diaz, A. Ramirez,B. Loeb, M. Barrera, I. Crivelli. Evaluation of the potential effectiveness of ruthenium(II) complexes with 2,3-disubtituted pyrazino[2,3-f][1,10]phenanthroline anchors, R(2)ppl (R = CN, COOH, COOEt, OH) as sensitizers for solar cells. Polyhedron. 52,62-71 (2013).

P. Dreyse , B. Loeb, M. Soto-Arriaza, D. Tordera, E. Ortí. Serrano-Pérez J, Bolink H. Effect of free rotation in polypyridinic ligands of Ru(ii) complexes applied in light-emitting electrochemical cells. Dalton Transactions. 42(43):15502-15513 (2013).

R. Diaz, M.A. Francois, M. Barrera, B. Loeb. Synthesis, characterization and theoretical studies of ruthenium(II) complexes with the quinone functionalized polypyridine ligand, Nqphen. Polyhedron, 39(1) 59-65 (2012).

F. Gajardo, M. Barrera, R.Vargas, I. Crivelli, B. Loeb. Influence of the Nature of the Absorption Band on the Potential Performance of High Molar Extinction Coefficient Ruthenium(II) Polypyridinic Complexes As Dyes for Sensitized Solar Cells. Inorganic Chemistry, 50(13) 5910-5924 (2011).

S. Salinas, B. Loeb, M.A. Soto-Arriaza New iridium cyclometallated complexes with potential application in OLED. Polyhedron, 30, 2863-2869 (2011).

R. Díaz, M.A. Francois, B. Loeb. Synthesis and characterization of rhenium(I) complexes with the polypyridinic quinone functionalized electron acceptor ligand [3,2 a: 2',3'C]-benzo[3,4]-phenazine- 11,16-quinone, Nqphen. Polyhedron, 30(5) 697-701 (2011).

E. Norambuena, C. Olea-Azar, A. Delgadillo, M. Barrera, B. Loeb. Comparative evaluation of the acceptor properties of quinone derivatized polypyridinic ligands. Chemical Physics, 359(1-3) 92–100 (2009).

F. Gajardo, A.M. Leiva, B. Loeb, A. Delgadillo, J.R. Stromberg, M.G. Meyer. Interfacial electron transfer on TiO2 sensitized with an axially anchored trans tetradentate Ru(II) compound. Inorganica Chimica Acta, 361(3) 613-619 (2008).

L. Barrientos, C. Araneda, B. Loeb, I. Crivelli. Synthesis, spectroscopic and electrochemical characterization of copper(I) complexes with functionalized pyrazino [2,3-f][1,10]-phenanthroline. Polyhedron, 27(4) 1288-1296 (2008).

E. Ferrada, V. Arancibia, B. Loeb, E. Norambuena, C. Olea-Azar, J. García-Huidobro. Stoichiometry and conditional stability constants of Cu(II) or Zn(II) clioquinol complexes; implications for Alzheimer's and Huntington's disease therapy. Neurotoxicology, 28(3) 445-449 (2007).

R. Díaz, M.A. Francois, A.M. Leiva, B. Loeb, E. Norambuena, M. Yánñez. Synthesis and characterization of polypiridine-based rhenium(I) complexes with pyrazino [2,3-f][1,10] phenanthroline. Helvetica Chimica Acta, 89(6) 1220-1230 (2006).

A. Delgadillo, M. Arias, A.M. Leiva, B. Loeb, T.G. Meyer. Interfacial charge-transfer switch: Ruthenium-dppz compounds anchored to nanocrystalline TiO2. Inorganic Chemistry, 45(15) 5721-5723 (2006).

M. Arias, J. Concepción, I. Crivelli, A. Delgadillo, R. Díaz, M.A. Francois, F. Gajardo, R. López, A.M. Leiva, B. Loeb. Influence of ligand structure and molecular geometry on the properties of d(6) polypyridinic transition metal complexes. Chemical Physics, 326(1) 54-70 (2006).

A. Delgadillo, A.M. Leiva, B. Loeb. Intramolecular excited state quenching: 5-[(E)-2-ferrocenylvinyl]-[1,10]-phenanthroline, a new donor ligand. Polyhedron, 24(13) 1749-1754 (2005).

R. López, B. Loeb, D. Striplin, M. Devenney, K. Omberg, T.J. Meyer. Tuning the excited states in fac-[Re(X(2)dppz)(CO)(3)(L)]: Intraligand, charge transfer or both?, Journal of the Chilean Chemical Society, 49(2) 149-156 (2004).

R.Contreras, B.Loeb, M.Valderrama, M.Lagos, F.Burgos, P.Ramírez, J.Concepción. Synthesis and reactivity of new methylallylpalladium(II) complexes with bidentate 2-(methylthio-N-benzylidene)anilines. Journal of Organometallic Chemistry, 689(2) 395-404 (2004).

B.Loeb, M.G.Mellace, F.Fagalde, N.E.Katz, I.Crivelli, A.Delgadillo, A.M.Leiva, M.T.Garland, R.Baggio. Dinuclear asymmetric ruthenium complexes with 5-cyano-[1,10]-phenanthroline as a bridging ligand. Inorganic Chemistry, 43(3) 1100-1107 (2003).

A.Delgadillo, P.Romo, A.M.Leiva, B.Loeb. Synthesis and characterization of ruthenium complexes with substituted pyrazino [2,3-f][1,10]-phenanthroline (= Rppl; R =Me, COOH, COOMe). Helvetica Chimica Acta, 86(6) 2110-2120 (2003).

C.Coddou, C.Villalobos, J.González, C.Acuña-Castillo, B.Loeb, J.Huidobro-García. Formation of carnosine-Cu(II) complexes prevents and reverts the inhibitory action of copper in P2X4 and P2X7 receptors. Journal of Neurochemistry, 80(4) 626-633 (2002).

I.Concepción, O.Just, A.M.Leiva, B.Loeb. Trans Ruthenium(II) complexes with Nh-Bridged tetradentate simmetric and asymmetric popypyridyl ligands. Inorganic Chemistry, 41(23) 5937-5939 (2002). 

Y.Portilla, I.Chávez, V.Arancibia, B.Loeb, J.M.Manríquez, A.Roig, E.Mollins. Effect of Asymmetry  on the Electronic Delocalization in Diron and Iron-Cobalt Mixed Valence Metallocenic Compounds. Inorganic Chemistry, 41(7) 1831-1836 (2002).

R.Díaz, O.Reyes, M.A.Francois, A.M.Leiva, B.Loeb. Synthesis of a new polypyridinic highly conjugated ligand with electron-acceptor properties. Tetrahedron Letter, 42(37) 6463-6467 (2001). 

A.Arancibia, J.Concepción, N.Daire, G.Leiva, A.M.Leiva, B.Loeb, R.del Río, R.Díaz, M.A.Francois, M.Saldivia. Electroni effects of donor and acceptor substituents on dipirido(3,2-a:2',3'-C) phenazine (dppzJ). Coordination Chemistry, 54(3) 323-336 (2001).

 J.Concepción, B.Loeb, Y.Simón-Manso, F.Zuloaga. Influence of L-Type Ligands on the Relative Stability and Interconversion of cis-trans -[Ru(phen)2L2]n+ Type Complexes. A Theoretical Study. Polyhedron, 19(22-23) 2297-2302 (2000).

A.Arancibia, A.M.Leiva, B.Loeb. Synthesis and Characterization of New Ruthenium Complexes with 11-carboxy-dipyrido(3,2-a:2',3'-C)-phenazine as Ligand. Boletin Socciedad Chilena de Química, 45, 587-592 (2000). 

M.Valderrama, R.Contreras, V.Arancibia, P.Muñoz. Hexamethylbenzeneruthenium(II) complexes containing bis(diphenylphosphine)amine and their sulphur or selenium derivatives as ligands. Boletin Sociedad Chilena de Química, 45, 227-235 (2000). 

I.Crivelli, M.A.Francois, D.Boys, A.Haberland, A.M.Leiva, R.Segura, B.Loeb. Experimental evidence of the disproportionation equilibrium in copper mixed valence complexes. Polyhedron, 19(22-23) 2289-2295 (2000). 

Ch.M.Hartshorn, N.Daire, V.Tondreau, B.Loeb, T.J.Meyer, P.S.White. Synthesis and characterization of Dinuclear Ruthenium complexes with Tetra-2-pyridylpyrazine as a Bridge. Inorganic Chemistry, 38, 3200-3206 (1999). 

R.López, A.M.Leiva, F. Zuloaga, B.Loeb, E.Norambuena, K.Omberg, J.Schoonover, D.Striplin, M.Devenney, T.J.Meyer. Excited-State Electron Transfer in a Chromophore- Quencher Complex. Spectroscopic Identification of a Redox-Separated State. Inorganic Chemistry, 38, 2924-2930 (1999).

R.López, D.Boys, B.Loeb, F.Zuloaga. Synthesis, Crystal Structure, Molecular Orbital Calculations and Electronic Properties of 2,3-di(2-Pyridyl)Naphto [2,3-f] Quinoxaline 7,12-quinone (Aqdpp). Journal of de Chemical Society-Perkin Transactions 2, 877-883 (1998).

B.Loeb, I.Crivelli, C.Andrade. Oxyhemocyanin: A Peroxo Copper(II) Complex? A Mixed Valence Alternative View Comments,  Inorganic Chemistry, 20, 1-26 (1998). 

R.López, B.Loeb, T.Boussie, T.J.Meyer. Synthesis of a New Phenanthroline Derived Ligand with Acceptor Properties. Tetrahedron Letters, 37, 5437-5440 (1996). 

J.A.Treadway, B.Loeb, R.López, F.R.Keene,T.J.Meyer. The Effect of Delocalization and Rigidity in the Acceptor Ligand on MLCT Exicted State Decay. Inorganic Chemistry, 35, 2242-2246 (1996). 

V.Tondreau, A.M.Leiva, B.Loeb, D.Boys, L.K.Stultz, T.J.Meyer. Synthesis, characterization and Crystal Structure of [Ru(tppz)(4,4'-(CH3)2bpy)Cl] (PF6)(tppz=2,3,5,6-tetrakis(2-pyridyl)pyrazine). Polyhedron, 15, 2035-2040 (1996). 

B. Loeb, I. Crivelli, C. Andrade. Violet mixed-valence copper-mecaptoetlylamine complex generated electrochemically or by r eversible interaction with oxygen. Inorganic Chimica Acta, 231(1/2) 21-27 (1995). 

I. Delsahut, B. Loeb. Electrochemical generation of an Asymmetric Copper Mixed Valence Complex, Journal of Coordination Chemistry, 33, 33-37 (1994).

B. Loeb. Electrochemical generation of mixed-valency copper complexes in solution. Mixed Valency Systems: Applications in Chemistry, Physics and Biology. (K. Prassides Ed.) Kluver Academic Publishers, 425-430 (1991). 

B. Loeb, I. Crivelli, C. Andrade. The 2-mercaptobenzothiazole and copper(II) reaction. Synthesis and Reactivity in Inorganic Metal-Organic Chemistry, 21(2) 331-342 (1991). 

A.M. Leiva, L. Rivera, B. Loeb. Analysis of copper(I) stability in the cationic [Cu(CH3CN)4-n(Ph3P)n]+ series of complexes. Polyhedron, 10(3) 347-350 (1991). 

B. Loeb, G. Neyhart, L. Worl, E. Danielson, P. Sullivan, T.J. Meyer. pH-induced intramolecular quenching. Ligand-bridged complexes containing Osmium and Ruthenium. Journal Physisc Chemistry, 93, 717-723 (1989). 

B. Loeb, J. Pizarro. Enfoque inorgánico de algunos problemas biológicos: Bioinorgánica. Boletin Sociedad de Química del Perú, L(1) 49-58 (1984). 

B. Loeb, F. Zuloaga. Singlet-triplet absorption and emission spectra of substituted cyanocobaltate(III) complexes. Journal Physics Chemistry, 81(1) 59-62 (1977).

Universidad de Chile, Facultad de Ciencias

Decana, Facultad de Química, Pontificia Universidad Católica de Chile (2012 - 2018)

Directora Academica de Desarrollo, Pontificia Universidad Católica de Chile (2007 - 2010).

Directora Academica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile (2003 - 2006).

Premio Carlos Casanueva (2020)

Charlas en colegios