CONTENTS

Synthesis of porphyrins for metal deposition studies in molecular information storage applications Oleg V. Kulikov, Izabela Schmidt, Ana Z. Muresan, Marcia A.-P. Lee, David F. Bocian* and Jonathan S. Lindsey* DOI: 10.1142/S1088424607000801 Page: 699-712 Fourteen porphyrins equipped with a surface attachment group (S-acetylthiomethyl, allyl, triallylmethyl, hydroxymethyl, TMS-ethynyl) and distal or lateral functional groups (amino, cyano, dipyrrin-5-yl, formyl, nitro) have been prepared for studies of metal deposition on self-assembled porphyrin monolayers.
Synthesis of one-dimensional structured metal phthalocyanine in an ionic liquid David S. Jacob, Somashekarappa Mallenahalli, Aharon Gedanken*, Leonid A. Solovyov, Evangelia Xenogiannopoulou, Konstantinos Iliopoulos and Stelios Couris DOI: 10.1142/S1088424607000813 Page: 713-718 Reaction in 1-butyl-3-methylimidazolium tetrafluoroborate solvent for metal-phthalocyanine synthesis leads to one-dimensional product.
Synthesis and photophysical studies of porphyrin-ferrocene conjugates Hanaa Mansour, Mohamed E. El-Khouly, Shaban Y. Shaban, Osamo Ito* and Norbert Jux* DOI: 10.1142/S1088424607000825 Page: 719-728 Several porphyrin-ferrocene conjugates, which are simple examples of a donor-acceptor charge separation system, were synthesized. Their photoinduced intramolecular and intermolecular processes have been investigated by time-resolved emission and nanosecond transient absorption techniques. Upon excitation of the porphyrins (H2P and ZnP) moieties, an efficient fluorescence quenching of the excited singlet porphyrin is observed. It was found that the quenching efficiency increases with increasing number of attached ferrocene moieties and solvent polarity. The main quenching pathway involves (i) electron transfer from ferrocene to the singlet excited porphyrin and (ii) the heavy-atom effect.
A new fluorescence molecular switch incorporating TTF and tetraphenylporphyrin units Yibo Liu, Chengyun Wang, Meijiang Li, Sufang Lv, Guoqiao Lai and Yongjia Shen* DOI: 10.1142/S1088424607000837 Page: 729-735 A donor-σ-acceptor compound incorporating tetrathiafulvalene and tetraphenylporphyrin units was synthesized. The fluorescence intensity of the compound could be reversibly modulated by sequential oxidation and reduction of the TTF unit using electrochemical and chemical methods. Therefore a new fluorescence molecular switch based on TTF and porphyrin units was established.
The influence of oxygen on the radiosensitizing activity of Photofrin II and hypericin Pamela Schaffer*, Ulrike Kulka, Birgit Ertl-Wagner, Roswita Hell, Alina Balandin, Alfons Hofstetter, Giulio Jori and Moshe Schaffer DOI: 10.1142/S1088424607000849 Page: 736-741 Both Photofrin II and Hypericin require the presence of oxygen to exert a radiosensitizing effect. When oxygen levels are reduced, radiation-induced tumor damage is lessened.
Synthesis of 1:2 molecular complexes between free base meso-tetraarylporphyrins and sulfur trioxide Hossein Dehghani* and Fereshteh Fathi DOI: 10.1142/S1088424607000850 Page: 742-748 The reaction of meso-tetraarylporphyrins and sulfur trioxide pyridine complex produced 1:2 molecular complexes that nitrogen atoms of pyrrolenine in the porphyrins act as electron donors to d orbital of sulfur in two sulfur trioxides.
Supporting porphyrins on resin-beads by cyanuric chloride linker Tommaso Carofiglio*, Milko Schiorlin and Umberto Tonellato DOI: 10.1142/S1088424607000862 Page: 749-754 A straightforward procedure for supporting porphyrin-derivatives onto resin beads has been developed by reacting the commercially available 4,6-dichloro-1,3,5-triazene polymer-bound with 5-(4-aminophenyl)-10,15,20-triphenylporphyrins as free base and as Zn(II) and Co(II) complexes. Kinetic and Hammett studies have shown that the SNAr reaction with the triazine bound reagent occurs with similar rate for free and metalated complexes, with a nucleophilic strength comparable to that of the unsubstituted aniline.
MnII/O2-oxidation products of α,ω-dimethyldipyrrins Martin Bröring*, Dirk Penno and Robin Krüger DOI: 10.1142/S1088424607000874 Page: 755-760 An unexpected oxidative C-C coupling reaction occurs upon MnII/O2 oxidation of meso-unsubstituted dipyrrins, and the unprecedented tripyrrolic product I was found as the major product of this reaction. I displays an intriguing positive solvatochromic behavior as determined by solvent dependent UV-vis spectroscopy.
Electrochemical and photophysical characterization of non-peripherally-octaalkyl substituted dichlorotin(IV) phthalocyanine and tetrabenzotriazaporphyrin compounds Samson Khene, Andrew N. Cammidge, Michael J. Cook and Tebello Nyokong* DOI: 10.1142/S1088424607000886 Page: 761-770 Of the three non-peripherally substituted tin(IV) macrocylic compounds, octahexylphthalocyaninato dichlorotin(IV), octahexyltetrabenzo-5,10,15- triazaporphyrinato dichlorotin(IV) and octadecylphthalocyaninato dichlorotin(IV), the second complex, containing a CH group in place of one of the aza nitrogen atoms of the phthalocyanine core, showed a split Q band and the largest value of triplet quantum yield ΦT = 0.78.

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