Porphyrins thin films

Cation Radical Formation with Exposure of Magnesium Porphyrin Thin Films to Light and Oxygen... 

Film preparation for optical/IR studies. These porphyrin thin films were prepared by vacuum sublimation using radiation shielded quartz... 

Uttiyh S, Pratontep S, Bhanthumnavin W, Buntem R, Kerdcharoen T (2008) Volatile organic compound sensor array based on zinc phthalocyanine and zinc porphyrin thin films. In 2nd IEEE International Nanoelectronics Conference, 2008. pp 618-623... 

Liu, C.-y., Bard, A. J. (1998). Enhanced quantum efficiencies and short-circuit photocurrents in solid porphyrin thin film cells by internal electric lields,./. Am. Chem. Soc., 120 5575. 

Paolesse R., Natale C. D., Dall Orto V. C., et al.. Porphyrin thin films coated qnartz crystal microbalances prepared by electropolymerization techniqne. Thin Solid Films, 354, 245-250,1999. 

Jaeger, N.L, Lehmkuhl, R., Schlettwein, D., and Wohrle, D. (1994) Observation of a transient structural change during the reversible reduction of a porphyrin thin film electrode. J. Electrochem. Soc., 141,1735-1739. 

Novel nanoscale discotic liquid crystalline porphyrins 14 with partial alkyl chain perfluorination has been designed and synthesized in our group which exhibits exceptionally enhanced tendency to spontaneously self-assemble into homeotropically ordered nanostructures [107]. The defect-free homeotropically aligned fluorinated porphyrin thin films were fabricated and characterized. In the films thinner than 10 pm in glass cells, it shows strong tendency towards homeotropic... 

Paolesse, R., C. Di Natale, V. Campo DaU Orto, A. Macagnano, A. Angelaccio, N. Motta, A. Sgarlata, J. Hurst, 1. Rezzano, M. Mascini, and A. D Amico (1999). Porphyrin thin films coated quartz crystal microbalances prepared by electropolymerisation technique. Thin Solid Films 354, 245-250. 

Dopamine, an important neurotransmitter molecule, was detected with metalloporphyrin—either Zn(II)-5,10,15,20-tetrakis(4-pyridyl)porphyrin or Co(n)-5,10,15,20-tetrakis(4-methoxyphenyl)-porphyrin—thin films on screen-printed carbon nanotube electrodes, prepared by matrix-assisted pulsed laser evaporation [235]. A few years later, an iron(III) [3,7,12,17-tetramethyl-8,13-divinylporphyrin-2,18-dipropanoato]/MWCNT composite was used to fabricate a modified glassy carbon electrode that was successfully used for the simultaneous determination of ascorbic acid, dopamine, nric acid, and nitrite ion [236]. 

Cristescu R, Popescu C, Popescu AC, Mihailescu IN, Ciucu AA, Andronie A, lordache S, Stamatin 1, Fagadar-Cosma E, Chrisey DB. Eunctional porphyrin thin films deposited by matrix assisted pulsed laser evaporation. Mater Sci Eng B 2010 169 106-10. 

Jones R, Tredgold R FI and Flodge P 1983 Langmuir-Blodgett films of simple esterified porphyrins Thin Solid Films 99 25-32... 

Ruaudel-Teixier A, Barraud A, Belbeoch B and Roulliay M 1983 Langmuir-Blodgett films of pure porphyrins Thin Soiid Fiims 99 33-40... 

The thin films are electrochemically active in both the oxidation and reduction regions, due to their having the electrochemically active zinc porphyrin units. The electrochemical processes are accompanied by color changes of the film, between black and yellowish-green in the oxidation region, and between red and yellowish-green in the reduction region. 

Porphyrin-based self-assembled molecular squares 389 can form mesoporous thin films in which the edge of a square, thus the size of the cavity, can be adjusted by appropriate choice of substituents [8]. Fibers that form coil-coiled aggregates with distinct, tunable helicity are built from crown ethers bearing porphyrins 390 [9]. In addition to the porphyrin applications discussed in Sections 6.3.2.2 and 6.4, dendrimer metalloporphyrins 391 to be applied in catalysis [10] and the water-soluble dendritic iron porphyrin 319 modelling globular heme proteins [11] can be mentioned. 

The [Ru(P)]2 systems are extremely air-sensitive (see Sect. 3.22). The first sample alleged to be [Ru(OEP)]2 [32] was probably one of its autoxidation products, [RuOH(OEP)]20 (see Sect. 3.22). A molecular thin film claimed to contain porphyrin dimers prepared from RuCO(Meso-IX-DME)Py by irradiation [221] showed UV/Vis spectra similar to those described for the first such product [32]. Therefore, it probably contained also a p-oxobis(ruthenium(IV)) complex. 

A large class of coordination compounds, metal chelates, is represented in relation to microwave treatment by a relatively small number of reported data, mainly p-diketonates. Thus, volatile copper) II) acetylacetonate was used for the preparation of copper thin films in Ar — H2 atmosphere at ambient temperature by microwave plasma-enhanced chemical vapor deposition (CVD) [735a]. The formed pure copper films with a resistance of 2 3 pS2 cm were deposited on Si substrates. It is noted that oxygen atoms were never detected in the deposited material since Cu — O intramolecular bonds are totally broken by microwave plasma-assisted decomposition of the copper complex. Another acetylacetonate, Zr(acac)4, was prepared from its hydrate Zr(acac)4 10H2O by microwave dehydration of the latter [726]. It is shown [704] that microwave treatment is an effective dehydration technique for various compounds and materials. Use of microwave irradiation in the synthesis of some transition metal phthalocyanines is reported in Sec. 5.1.1. Their relatives - porphyrins - were also obtained in this way [735b]. 

An alternative route to solution-processible organic semiconductors is to use precursors to small molecule semiconductors, such as pentacene [59] or tetrabenzo-porphyrin [60], which can be converted into their fully conjugated, insoluble form by thermal or irradiative [61] treatment on the substrate. Pentacene precursors have been shown to yield field-effect mobilities of 0.01-0.1 cm2 V-1 s 1 [62], and 0.1-0.8 cm2 V-1 s 1 [63] after thermal conversion at 150-200 °C. Small molecule organic semiconductors can also be rendered solution processible by attachment of flexible side chains [64-66], Due to the relatively low solubility of these molecules the growth of uniform thin films of these molecules remains challenging, however. 

Cook MJ, Chambrier I (2003) Phthalocyanine thin films and structural studies In Kadish KM, Smith KM, Guilard R (eds) Porphyrin handbook, phthalocyanine properties and materials, vol 17, Chap 108. Academic Press, New York... 

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