CONTENTS

Synthesis and radiosensitizing properties of brominated tetrapyridine porphyrins Rosalie Lemay, Jean-Philippe Tremblay-Morin, Hasrat Ali, Darel Hunting, Johan E. van Lier and Benoit Paquette* DOI: 10.1142/S1088424607000643 Page: 549-555 Brominated derivatives of tetrapyridinium copper porphyrin were prepared. The radiosensitizing properties of these new cationic, brominated porphyrins were tested on MDA-MB-231 breast cancer cells in vitro. A pronounced radiosensitizing effect was observed with the porphyrin containing bromo atoms at both β-positions (pyrrole rings) and the peripheral alkyl side chains.
Thermodynamics investigation of a series of metalloporphyrazine-bovine serum albumin complexes A-Khalegh Bordbar*, Hamid Dezhampanah, Mozaffar Asadi, Elham Safaei, Nasrin Sohrabi and Yadollah Khodadost DOI: 10.1142/S1088424607000655 Page: 556-565 Zn(II), Cu(II), and Co(II) complexes of tetra-2,3- and -3,4-tetrapydinoporphyrazines were investigated for their interaction with bovine serum albumin in aqueous buffer solution. The complexes exist in solution as monomers and binding as 1:1 conjugates occurs by predominately hydrophobic and minor electrostatic interactions also as monomers.
Oxidation of chlorophyll a with selenium dioxide Paavo H. Hynninen∗ and K. Juhani Pitkänen DOI: 10.1142/S1088424607000667 Page: 566-575 The selenium dioxide oxidation of chlorophyll a in deaerated pyridine solution under argon, produced, after 4 hours of refluxing, work-up and chromatographic purifications on a sucrose column, 132(S/R)-hydroxy-chlorophyll a (20%), 132(S/R), P4(S/R)-dihydroxy-chlorophyll a (19%), and P4(S/R)-hydroxy-132-demethoxycarbonyl-132-oxo-chlorophyll a (10%).
The effect of lipid composition, bilayer phase and temperature on the uptake of hematoporphyrin by liposomal membranes Refael Minnes, Hana Weitman and Benjamin Ehrenberg* DOI: 10.1142/S1088424607000679 Page: 577-585 In this study we investigated, spectroscopically, the binding of hematoporphyrin (HP) to non-charged lipid vesicles as a function of temperature and the molecular structure of the phospholipid. The temperature dependence of partitioning was employed to evaluate the thermodynamic parameters of the process. We explain the differences in temperature-dependence of binding on the basis of the bilayer’s order and hydrophobicity.
Cationic Zn and Al phthalocyanines: synthesis, spectroscopy and photosensitizing properties Dmitry A. Makarov, Olga A. Yuzhakova, Ludmila K. Slivka, Nina A. Kuznetsova*, Vladimir M. Negrimovsky, Oleg L. Kaliya and Evgeny A. Lukyanets DOI: 10.1142/S1088424607000680 Page: 586-595 Several Zn(II) and Al(III) phthalocyanines bearing eight or sixteen positive charges on substituents of different structure have been prepared. Number of charges and peculiarities of Pc structure render the specific intermolecular interactions in solution which impact on photosensitizing properties of phthalocyanines.
Efficient synthesis of porphycene Natalia Urbańska, Marek Pietraszkiewicz* and Jacek Waluk* DOI: 10.1142/S1088424607000692 Page: 596-600 Unsubstituted porphycene can be obtained by removing tert-butyl substituents from 2,7,12,17-tetra-tert-butylporphycene. The reaction proceeds with 65% yield. Taking into account the yield of the substrate, this procedure gives more than a fivefold improvement in comparison with the classical methodology of porphycene synthesis.
Syntheses and optoelectronic properties of amino/carboxyphenylporphyrins for potential use in dye-sensitized TiO2 solar cells Michael G. Walter, Carl C. Wamser*, Joseph Ruwitch, Yinping Zhao, Dale Braden, Matt Stevens, Al Denman, Rick Pi, Alexander Rudine and Peter J. Pessiki DOI: 10.1142/S1088424607000709 Page: 601-612 Three different synthetic methods have been evaluated for the preparation of mixed-substituent amino/carboxyphenylporphyrins. The syntheses vary in initial reactants, reaction conditions, overall yields, and necessary separations appropriate for sensitive amino and carboxy groups. The synthesized porphyrins show decreased and red-shifted UV-vis absorbance properties with increasing numbers of aminophenyl groups. The HOMO/LUMO energy levels match well with the TiO2 and polyaniline components in a solid-state dye-sensitized solar cell.
The observation of room temperature delayed fluorescence in various non-peripherally substituted phthalocyanines Jannie C. Swarts and M. David Maree* DOI: 10.1142/S1088424607000710 Page: 613-617 Delayed fluorescence has been observed in phthalocyanines for the first time. Monomeric, non-peripherally substituted phthalocyanines were selected for quantification of the quantum yields and the lifetimes of the delayed fluorescence at room temperature. Evidence from solution measurements suggests an E-type delayed fluorescence mechanism.
Electrochemically induced orientation of copper phthalocyanine thin films Luciana Gaffo*, Andrelson W. Rinaldi, Marcos J. L. Santos and Emerson M. Girotto DOI: 10.1142/S1088424607000722 Page: 618-622 The dependence of the electrochromic and organizational behaviors of cooper phthalocyanine (CuPc) evaporated thin films on oxidation level have been investigated. The FTIR spectra showed an improved molecular orientation of CuPc molecules, obtained after the electrochemical process.

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