Molecular orientation of Ru(II) complexes introduced in hybrid Langmuir–Schaefer films of clay nanosheets and alkylammonium cations

Shinohara, Emi; Umemura, Yasushi

doi:10.1016/j.tsf.2013.07.012

Cited by 6 publications

(14 citation statements)

References 43 publications

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“…The optimum conditions for preparing a clay hybrid film of high quality were studied extensively [8,9]. The surface morphology and layered structures of a deposited film were investigated by means of various spectroscopic methods [10]. The nanometer-thick films thus prepared were mechanically rigid in comparison to the LB films consisting of amphiphilic molecules alone.…”

Section: Methodsmentioning

confidence: 99%

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Oxygen Sensing by the Hybrid Langmuir-Blodgett Films of Iridium(III) Complexes and Synthetic Saponite on the Basis of Energy Transfer

2017

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An ultra-thin hybrid film of amphiphilic iridium(III) complexes and synthetic saponite was manipulated by means of the modified Langmuir-Blodgett method. In the film deposited onto a quartz substrate, the external mixed molecular layer of amphiphilic iridium(III) complexes was reinforced by the inner layer of exfoliated synthetic saponite. As components of the molecular layer, two iridium(III) complexes were used: [Ir(dfppy) 2 (dc9bpy)] + (dfppyH = 2-(4 ,6 -difluorophenyl) pyridine; dc9bpy = 4,4 -dinonyl-2,2 -bipyridine) (denoted as DFPPY) and [Ir(piq) 2 (dc9bpy)] + (piqH = 1-phenyisoquinoline)) denoted as PIQ). The emission spectra from the films changed from blue to red maxima with the decrease of a ratio of DFPPY/PIQ due to the energy transfer from excited DFPPY to PIQ. The intensity of red decreased with the increase of oxygen pressure through the quenching of excited iridium(III) complexes, promising a possibility as an oxygen-sensing film.

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Section: Methodsmentioning

confidence: 99%

“…Recently, the hybridization of amphiphilic cations with clay minerals were attempted to prepare an LB film in order to overcome the disadvantage of fragileness [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Clay minerals are layered inorganic compounds.…”

Section: Introductionmentioning

confidence: 99%

Oxygen Sensing by the Hybrid Langmuir-Blodgett Films of Iridium(III) Complexes and Synthetic Saponite on the Basis of Energy Transfer

2017

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“…First, the layer structures of the hybrid films are very stable, which is different from the structural stability of conventional Langmuir− Blodgett (LB) or Langmuir−Schaefer (LS) films. 19,20,27,33 Second, the densities of the amphiphilic cations in the films are controllable by changing clay concentrations in the dispersions; in a high-concentration dispersion, the adsorption rate of the clay is high so that the clay nanosheets are adsorbed on a floating film of the amphiphilic cations before the cations form closely packed domains through hydrophobic interaction. 19,20,27 Third, the cation-exchange capacity remains on the clay nanosheet surface of the hybrid film because the negative charge density of the clay nanosheet layer is higher than the positive charge density of the amphiphilic cation layer in the film.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Hence, one can form another cationic layer (as the third layer component) by immersing the film surface in a corresponding salt solution after every deposition of the organoclay hybrid monolayer from the air-dispersion interface. 20,27,33 The density of the third cationic component in the film is dependent on the charge balance between the clay and amphiphilic cation layers. It is noteworthy that the hybrid three-layer-component films showed second harmonic generation activities due to their noncentrosymmetric layer order.…”

Section: ■ Introductionmentioning

confidence: 99%

“…On the other hand, because [Ru(dpp) 3 ]Cl 2 is soluble in water, it was possible to prepare another type of three-layercomponent film by spreading the ODAH + Cl − chloroform solution on the aqueous clay dispersion and then dipping the transferred hybrid film in an aqueous [Ru(dpp) 3 ]Cl 2 solution. 33 The layer order of this three-component film should be the ODAH + layer, the clay nanosheet layer, and the [Ru(dpp) 3 ] 2+ layer from the substrate (Figure 1b). The films with this order were called OCR films.…”

Section: ■ Introductionmentioning

confidence: 99%

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Fabrication of Three-Layer-Component Organoclay Hybrid Films with Reverse Deposition Orders by a Modified Langmuir–Schaefer Technique and Their Pyroelectric Currents Measured by a Noncontact Method

Hirahara

Umemura

2015

Langmuir

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In an aqueous clay mineral (montmorillonite) dispersion at a low concentration, isolated clay nanosheets with negative charges were suspended. When a solution of amphiphilic octadecylammonium chloride (ODAH(+)Cl(-)) was spread on an air-dispersion interface, the clay nanosheets were adsorbed on the ODAH(+) cations at the interface to form a stable ultrathin floating film. The floating film was transferred onto a substrate by the Schaefer method, and then the film was immersed in a [Ru(dpp)3]Cl2 (dpp = 4,7-diphenyl-1,10-phenanthroline) solution. The Ru(II) complex cations were adsorbed on the film surface because the film surface possessed a cation-exchange ability. The layers of ODAH(+), clay nanosheets, and [Ru(dpp)3](2+) were deposited in this order. By repeating these procedures, three-layer-component films were fabricated (OCR films). In a similar way, three-layer-component films in which the layers of [Ru(dpp)3](2+), clay nanosheets, and ODAH(+) were deposited in the reverse order (RCO films) were prepared by spreading a [Ru(dpp)3](ClO4)2 solution and immersing the films in an ODAH(+)Cl(-) solution. Both OCR and RCO films were characterized by surface pressure-molecular area (π-A) curve measurements, IR and visible spectroscopy, and the XRD method. The OCR and RCO film systems possessed nearly the same properties in the densities of ODAH(+) and [Ru(dpp)3](2+) and the tilt angle of the Ru(II) complex cation, although the layer distance for the RCO film was a little longer than that for the OCR film and the layered structure for the RCO film was less ordered than that for the OCR film. Pyroelectric currents for the films were measured by a noncontact method using an (241)Am radioactive electrode. When the films were heated, the pyroelectric currents were observed and the current directions for the OCR and RCO films were different. This was clear evidence that the layer order in the OCR film was reverse of that in the RCO film.

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Application of electrospray spreading to a modified Langmuir–Blodgett technique for organo-clay hybrid film preparation

Hirahara

Kaida

Miyauchi

et al. 2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Molecular orientation of Ru(II) complexes introduced in hybrid Langmuir–Schaefer films of clay nanosheets and alkylammonium cations

Cited by 6 publications

References 43 publications

Oxygen Sensing by the Hybrid Langmuir-Blodgett Films of Iridium(III) Complexes and Synthetic Saponite on the Basis of Energy Transfer

Oxygen Sensing by the Hybrid Langmuir-Blodgett Films of Iridium(III) Complexes and Synthetic Saponite on the Basis of Energy Transfer

Fabrication of Three-Layer-Component Organoclay Hybrid Films with Reverse Deposition Orders by a Modified Langmuir–Schaefer Technique and Their Pyroelectric Currents Measured by a Noncontact Method

Application of electrospray spreading to a modified Langmuir–Blodgett technique for organo-clay hybrid film preparation

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