Structural and spectroscopic characterization of Cu(II) [tetrakis-(3,3-dimethyl-l-butoxycarbonyl)] phthalocyanine thin films deposited by the Langmuir—Blodgett technique

Pasimeni, Luigi; Meneghetti, Moreno; Rella, R.; Valli, Ludovico; Granito, Catia; Troisi, Luigino

doi:10.1016/0040-6090(95)06598-9

Cited by 42 publications

(19 citation statements)

References 30 publications

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“…where the internal incidence angle, b9, is connected with the external one, b, through the relation that defines the refractive index of the film, n: b9 = arcsin(n 21 sinb). Setting n = 1.4, a typical value for organic films, 33,34 we calculate ,cos 2 h> between 0.04 and 0.1, corresponding to h values between 72u and 79u. Thus, the aggregates arrange preferentially with their J transition dipole moments lying almost flat on the film plane.…”

Section: Resultsmentioning

confidence: 99%

Large third-order nonlinear optical response of porphyrin J-aggregates oriented in self-assembled thin films

et al. 2006

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The preparation and characterization of a self-assembled material showing a high nonlinear response and good photostability to ultrashort laser pulses is presented. The material is built by alternate deposition of tetrakis(4-sulfonatophenyl) porphyrin diacid (H4TPPS2-) and poly(diallyldimethylammonium chloride) (PDDA) forming electrostatically self-assembled multilayers (ESAMs). UV-visible absorption and emission experiments show that in this matrix H4TPPS2- is present mainly in its J-aggregated form. Furthermore, linear dichroism experiments on a 3 bilayer film show a preferential alignment of the porphyrin aggregate with the J-band transition dipole moment parallel to the film surface. The two photon absorption (TPA) properties of these films are investigated with the Z-scan technique at 806 nm, employing 130 fs pulses. The samples exhibit strong nonlinearities with a very large two-photon absorption coefficient beta(TPA) of 50 cm GW(-1). The origin of this large response is investigated. It has been already demonstrated that aggregation enhances the molecular TPA cross section of H4TPPS2- from 30 to 1000 GM in water solution thanks to cooperative effects. In a 20 bilayer film a further increase by a factor of 1.7 is observed and explained in terms of preferential alignment of J-aggregates in the multilayer

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Section: Resultsmentioning

confidence: 99%

Large third-order nonlinear optical response of porphyrin J-aggregates oriented in self-assembled thin films

et al. 2006

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“…In particular, the Q d band was attributed to the development of a onedimensional linear stacking of the phthalocyanine molecules in form of dimers, trimers, etc [18]. Fig.…”

Section: Optical Characterizationmentioning

confidence: 99%

Optical characterization and analysis of the gas/surface adsorption phenomena on phthalocyanines thin films for gas sensing application

Spadavecchia

Ciccarella

Rella

2005

Sensors and Actuators B: Chemical

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“…The aggregate orientational distributions were investigated by measuring the linear dichroism of LB films made of 29 layers per side of the quartz plate. Measurements were performed at different values of the incidence angle, b = 0u (normal to the film), 30u and 45u (these values were corrected for the film refractive index, n = 1.4, 34 as b real = arcsin(n 21 sinb)). 35 The J bands in the films of both dyes exhibited a marked linear dichroism (Fig.…”

Section: Langmuir-blodgett Filmsmentioning

confidence: 99%

A comparative study of two amphiphilic merocyanines: from monomers to aggregates in Langmuir and Langmuir–Blodgett mixed films

et al. 2013

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The Langmuir-Blodgett (LB) films with J aggregates of the amphiphilic MC2 merocyanine have been deeply investigated for more than two decades, mainly because of their interest for applications in photonic devices. To extend the excitation/emission wavelength range, we have studied an homologous dye, MC1, based on a shorter merocyanine chromophore, aiming at checking the ability of this compound to arrange into J aggregates within stable LB films. In this comparative MC1/MC2 investigation, we have addressed the structural and spectroscopic properties of the monomers in solution, the thermodynamic and morphological properties of the Langmuir monolayers at the air-water interface and the spectroscopic and photophysical properties, and the structural features thence obtainable, of the aggregates in the LB films. 1 H NMR experiments have shown that, in chloroform solutions, both dyes adopt planar conformations with the hydrophilic and hydrophobic groups pointing to opposite directions. Strongly attractive interactions are exhibited by both dyes towards arachidic acid in monolayers at the airsubphase interface, with a maximum stability for the 1 : 2 MC(1/2) : AA mixture. Relatively homogeneous LB multilayers have been obtained from 1 : 4 and 1 : 2 MC : AA mixtures with good transfer ratios. Absorption and emission of the LB films of MC1 are dominated by J aggregates, while those of MC2 show some H aggregate contributions too. The J aggregates of both compounds exhibit a tendency to align with the transition dipoles along the film dipping direction, only slightly tilted relative to the substrate surface; however, this tendency is more pronounced for the MC1 J aggregates. Overall, MC1 yields slightly more stable monolayers and more solid multilayers compared to MC2.

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Structural and spectroscopic characterization of Cu(II) [tetrakis-(3,3-dimethyl-l-butoxycarbonyl)] phthalocyanine thin films deposited by the Langmuir—Blodgett technique

Cited by 42 publications

References 30 publications

Large third-order nonlinear optical response of porphyrin J-aggregates oriented in self-assembled thin films

Large third-order nonlinear optical response of porphyrin J-aggregates oriented in self-assembled thin films

Optical characterization and analysis of the gas/surface adsorption phenomena on phthalocyanines thin films for gas sensing application

A comparative study of two amphiphilic merocyanines: from monomers to aggregates in Langmuir and Langmuir–Blodgett mixed films

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