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Abstract:

The lyotropic behavior of three mixed valence diruthenium(II,III) alkoxybenzoates in dodecane mixtures has been analyzed. The studied compounds, namely, Ru2(3,4,5-B3OC14)4Cl [1] (3,4,5-B3OC14 = 3,4,5-tri(n-tetradecyloxy)benzoate), Ru2(3,4-B2OC14)4Cl [2] (3,4-B2OC14 = 3,4-di(n-tetradecyloxy)benzoate), and Ru2(3,5-B2OC14)4Cl [3] (3,5-B2OC14 = 3,5-di(n-tetradecyloxy)benzoate), were investigated at three different temperatures (40, 70, and 100°C) for variable solvent concentrations (between 0 and 70 wt%). Mixing the complexes with up to 40-60 wt% of dodecane did not alter the nature of the low-temperature mesophase exhibited by the pure compound still showing a columnar hexagonal phase. However, it resulted in a substantial decrease of the viscosity for all of them and a depression of the melting point for [2]. For solvent concentrations greater than 40-60 wt% and high temperatures, the mixtures exhibited also a nematic columnar mesophase prior to the transition to the isotropic solution. At a structural level, the incorporation of solvent resulted in the swelling of the columns, leading to an increase of the intercolumnar distance up to a point where the columns lost their hexagonal order to give the columnar nematic phase. At higher concentrations of solvent, the mesophase dissolved into the solvent.

Registro:

Documento: Artículo
Título:Lyotropic behavior of diruthenium (II,III) alkoxybenzoates in dodecane
Autor:Rusjan, M.; Donnio, B.; Heinrich, B.; Cukiernik, F.D.; Guillon, D.
Filiación:Departamento de Quimica Inorganica, Analitica y Quimica Fisica, Universidad de Buenos Aires, Pabellon II, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
IPCMS, Grp. des Materiaux Organiques (GMO), UMR 7504 CNRS-Univ.-Louis-Pasteur, 23 Rue du Loess, 67037 Strasbourg Cedex, France
Instituto de Ciencias, Univ. Nacional de General Sarmiento, Roca 850, 1663 San Miguel, Buenos Aires, Argentina
Palabras clave:Chemical analysis; Complexation; Electronic structure; Melting; Mixtures; Nematic liquid crystals; Paraffins; Phase transitions; Solutions; Swelling; Temperature; Viscosity; Diruthenium alkoxybenzoates; Lyotropic behavior; Melting point; Nematic columnar mesophase; Ruthenium compounds
Año:2002
Volumen:18
Número:26
Página de inicio:10116
Página de fin:10121
DOI: http://dx.doi.org/10.1021/la026510j
Título revista:Langmuir
Título revista abreviado:Langmuir
ISSN:07437463
CODEN:LANGD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v18_n26_p10116_Rusjan

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Citas:

---------- APA ----------
Rusjan, M., Donnio, B., Heinrich, B., Cukiernik, F.D. & Guillon, D. (2002) . Lyotropic behavior of diruthenium (II,III) alkoxybenzoates in dodecane. Langmuir, 18(26), 10116-10121.
http://dx.doi.org/10.1021/la026510j
---------- CHICAGO ----------
Rusjan, M., Donnio, B., Heinrich, B., Cukiernik, F.D., Guillon, D. "Lyotropic behavior of diruthenium (II,III) alkoxybenzoates in dodecane" . Langmuir 18, no. 26 (2002) : 10116-10121.
http://dx.doi.org/10.1021/la026510j
---------- MLA ----------
Rusjan, M., Donnio, B., Heinrich, B., Cukiernik, F.D., Guillon, D. "Lyotropic behavior of diruthenium (II,III) alkoxybenzoates in dodecane" . Langmuir, vol. 18, no. 26, 2002, pp. 10116-10121.
http://dx.doi.org/10.1021/la026510j
---------- VANCOUVER ----------
Rusjan, M., Donnio, B., Heinrich, B., Cukiernik, F.D., Guillon, D. Lyotropic behavior of diruthenium (II,III) alkoxybenzoates in dodecane. Langmuir. 2002;18(26):10116-10121.
http://dx.doi.org/10.1021/la026510j