Amphiphilic Zinc Phthalocyanine Research Articles

A Novel Amphiphilic Zinc Phthalocyanine LB Flms as Gas Sensor Material and its Interaction with NH3

Two kinds of amphiphilic phthalocyanines(AmPc,AmPcZn) have been deposited as smooth and well ordered LB films. Absorption spectra show that AmPc films are consistent with a stacked cofacial columnar structure while the AmPcZn films consist of aggregates with weakly interacting molecules. These two films exhibit different behavior toward NH3 gas-sensing. AmPcZn films gave strong and fast response on exposure to NH3 whereas AmPc films showed very weak response. It is proposed that coordination of NH3 by AmPcZn results in lowering the energy gap and hence the activation energy of AmpcZn that account for the larger increase in conductance of AmpcZn films compared with AmPc films.

Photoelectric conversion of a novel langmuir-blodgett film

The photoelectric conversion of a novel Langmuir-Blodgett (LB) film consisting of 3.4.9.10-perylenetetracarboxylic diimides (PTCDI) and amphiphilic zinc phthalocyanine (AmZnPc) were investigated. The results show that the PTCDI molecules were embedded in the cavity between the long alkyl chains of AmZnPc in the monomolecular layer of LB film. The V oc of the monomolecular layer of a mixture of PTCDI (E) and AmZnPc was as high as 145 mV.

Structural characterization of mixed Langmuir—Blodgett multilayer assemblies consisting of amphiphilic zinc phthalocyanine and hydrophobic porphyrin by Fourier—transform IR (FTIR) spectroscopy

A new amphiphilic zinc phthalocyanine (AmZnPc), containing long alkyl chains covalently linked to the positively charged macroring with the counter-anion iodide as electron donor, was synthesized. Multilayers of AmZnPc mixed with hydrophobic porphyrin were successfully fabricated on CaF 2 plates. From Fourier-transform IR (FTIR) transmission and polarized transmission spectroscopic studies, it was found that the long alkyl chains of AmZnPc exhibit hexagonal subcell packing and are oriented nearly perpendicular to the AmZnPc macroring. The AmZnPc macroring is oriented almost parallel to the substrate surface, whereas the porphyrin is embedded in the cavity between the long alkyl chains of AmZnPc and is tilted somewhat from the substrate surface.

Novel Langmuir—Blodgett films, consisting of amphiphilic zinc phthalocyanine and hydrophobic porphyrin

An amphiphilic zinc phthalocyanine (AmZnPc) containing long alkyl chains covalently attached to the positively charged macroring was synthesized. A monolayer of AmZnPc with equimolar meso-tetrakis-(4-tolyl)porphine (TTP) was spread on water from chloroform solution and transferred onto CaF2 slides. Multilayers were also built up on these substrates. Surface pressure-area isotherms and UV—visible absorption spectra showed that the porphyrin molecules are arranged in the cavity between the long alkyl chains of AmZnPc in one layer of the Langmuir—Blodgett film. Polarized UV—visible spectroscopy indicated that there is no anisotropy in the layer plane and the AmZnPC macroring plane lies nearly parallel to the substrate surface.