Langmuir-Blodgett Film Formation of a Series of Peripherally Octasubstituted Metallophthalocyanines

Burghard, Marko; Schmelzer, M.; Roth, S.; Haisch, P.; Hanack, Michael

doi:10.1021/la00023a057

Cited by 48 publications

(25 citation statements)

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“…Again, molecular orientation induced in LB films depends on the metal and fabrication conditions, such as surface pressure of deposition and dipper speed. [46][47][48][49][50][51][52][53] In contrast to the lack of orientation in the LbL films studied here, Zucolotto et al 29 reported preferential orientation for FeTsPc (the same molecule of the present study), but with the films being fabricated at a different pH. Because the pH of the solutions employed in the adsorption process of the LbL films governs the electrostatic interactions, film morphology may differ substantially with a change in pH.…”

Section: Resultsmentioning

confidence: 99%

Exploiting Distinct Molecular Architectures of Ultrathin Films Made with Iron Phthalocyanine for Sensing

et al. 2008

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The possibility of generating distinct film properties from the same material is crucial for a number of applications, which can only be achieved by controlling the molecular architecture. In this paper we demonstrate as a proof-of-principle that ultrathin films produced from iron phthalocyanine (FePc) may be used to detect trace amounts of copper ions in water, where advantage was taken of the cross sensitivity of the sensing units that displayed distinct electrical properties. The ultrathin films were fabricated with three methods, namely physical vapor deposition (PVD), Langmuir-Blodgett (LB), and electrostatic layer-by-layer (LbL) techniques, where for the latter tetrasulfonated phthalocyanine was used (FeTsPc). PVD and LB films were more homogeneous than the LbL films at both microscopic and nanoscopic scales, according to results from microRaman spectroscopy and atomic force microscopy (AFM), respectively. From FTIR spectroscopy data, these more homogeneous films were found to have FePc molecules oriented preferentially, tilted in relation to the substrate surface, while FeTsPc molecules were isotropically distributed in the LbL films. Impedance spectroscopy measurements with films adsorbed onto interdigitated gold electrodes indicated that the electrical response depends on the type of film-forming method and varies with incorporation of copper ions in aqueous solutions. Using principal component analysis (PCA), we were able to exploit the cross sensitivity of the sensing units and detect copper ions (Cu 2+ ) down to 0.2 mg/L, not only in ultrapure water but also in distilled and tap water. This level of sensitivity is sufficient for quality control of water for human consumption, with a fast, low-cost method.

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Section: Resultsmentioning

confidence: 99%

Exploiting Distinct Molecular Architectures of Ultrathin Films Made with Iron Phthalocyanine for Sensing

et al. 2008

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“…Apart from these important material properties, this class of compound also exhibits a wide range of other qualities [1], for instance in the area of electrical conductivity [2,3] and liquid crystals [4,5]. Phthalocyanines have been used in Langmuir-Blodgett films [6,7], as gas sensors [8], for optical data storage [9] and in non-linear optics (as described herein). Generally, the main restricting factor for their processing and application is a rather low solubility in common organic solvents.…”

Section: Introductionmentioning

confidence: 99%

The Electronic and Non-linear Optical Properties of Oxo-titanium Phthalocyanines

Henari

Davey

Blau

et al. 1999

J. Porphyrins Phthalocyanines

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The valence electronic properties of some unsubstituted and peripherally substituted oxo-titanium phthalocyanines are reported. Semiempirical quantum chemical calculations show that the nature of peripheral substituents has a strong bearing on the valence electronic properties, including the state dipole moments and absorption wavelength. The non-linear optical response was measured around the the Q-band resonance. The effect of different substituents and substitution patterns on the non-linear behaviour of the samples was determined. The combined results suggest that tuning of electronic and optical properties is effectively achieved by functionalization of the edges of the conjugated ring.

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“…

Three 1,8,15, 4 ] [H 2 Pc(α-OC 5 H 11 ) 4 = 1,8,15,22-tetrakis(3-pentyloxy)-phthalocyanine; H 2 Pc(α-OC 7 H 15 ) 4 = 1,8,15,22-tetrakis(2,4-dimethyl-3-pentyloxy)phthalocyanine; H 2 Pc(α-OC 10 H 7 ) 4 = 1,8,15,22-tetrakis-(2-naphthyloxy)phthalocyanine] (1-3) have been prepared by treating the corresponding metal-free phthalocyanines H 2 Pc(α-OR) 4 with Ni(acac) 2 ·2H 2 O in refluxing n-pentanol. Structures of the Langmuir monolayers of these compounds at different temperature have been investigated.

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mentioning

confidence: 99%

Two-dimensional “nano-ring and nano-crystal” morphologies in Langmuir monolayer of phthalocyaninato nickel complexes

Liu

Bian

et al. 2006

Journal of Colloid and Interface Science

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Langmuir-Blodgett Film Formation of a Series of Peripherally Octasubstituted Metallophthalocyanines

Cited by 48 publications

References 1 publication

Exploiting Distinct Molecular Architectures of Ultrathin Films Made with Iron Phthalocyanine for Sensing

Exploiting Distinct Molecular Architectures of Ultrathin Films Made with Iron Phthalocyanine for Sensing

The Electronic and Non-linear Optical Properties of Oxo-titanium Phthalocyanines

Two-dimensional “nano-ring and nano-crystal” morphologies in Langmuir monolayer of phthalocyaninato nickel complexes

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