Side-to-Face Ruthenium Porphyrin Arrays: Photophysical Behavior of Dimeric and Pentameric Systems

Prodi, Anna; Indelli, María Teresa; Kleverlaan, Cornelis J.; Scandola, Franco; Alessio, Enzo; Gianferrara, Teresa; Marzillï, Luigi G.

doi:10.1002/(sici)1521-3765(19990903)5:9<2668::aid-chem2668>3.0.co;2-m

Cited by 102 publications

(39 citation statements)

References 13 publications

(23 reference statements)

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“…Several metal ions, in particular Zn(II) [21][22][23][24][25], but also Ru(II) [26][27][28], Sn(IV) [28] Co(II) [29] and Rh(III) [30], which are present in metalated porphyrins, can axially bind one or two ligands. This method has been extensively used to prepare self-assembled supramolecular systems with complex architectures [31,32].…”

Section: Introductionmentioning

confidence: 99%

A practical approach to the study of photoactive self-assembled porphyrin systems

Flamigni

Talarico

Ventura

2003

J. Porphyrins Phthalocyanines

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An overview of simple methods for the determination, by UV-vis spectroscopy, of association constants of porphyrin based, self-assembling components is presented. Sources of ambiguity and errors are outlined in order to provide non-specialists with basic information. A few cases of self-assembled structures based on porphyrins and displaying photoinduced energy and electron transfer processes are reviewed and evidence is given that a correct determination and interpretation of the association phenomena are of key importance for the interpretation of the photoinduced processes within the array.

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Section: Introductionmentioning

confidence: 99%

A practical approach to the study of photoactive self-assembled porphyrin systems

Flamigni

Talarico

Ventura

2003

J. Porphyrins Phthalocyanines

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“…Given the supramolecular nature of 1 , its energy levels can be approximated as a simple superposition of those of the constituent Zn–porphyrin and free‐base chromophores 10a. To this simple picture, however, possible states of intercomponent charge‐transfer character should be added.…”

Section: Resultsmentioning

confidence: 99%

Electronic Energy Transfer in a Multiporphyrin‐Based Molecular Box

et al. 2006

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The molecular box 1 comprises of two zinc-porphyrin metallacycles connected by two free-base 4'-trans-dipyridylporphyrins, axially coordinated to the zinc centers. The photophysics of 1 were studied in chloroform by emission and ultrafast absorption spectroscopy. In the molecular box, fast singlet energy transfer (main component, tau=32 ps) is observed to occur from the zinc-porphyrin metallacycles to the free-base chromophores. From wavelength-dependent spectrofluorimetric data, the efficiency of the energy-transfer (ET) process is estimated as 0.5. The lower-than-unity value is tentatively attributed to the possibility of a competing electron-transfer quenching pathway. Molecular box 1 can be considered to be a simple, self-assembling, six-chromophore antenna system. It has an inner cavity, 11.4 Angstrom wide, that could be used, in principle, to host a variety of guest molecules and obtain higher-order assemblies.

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“…The second mi nor com ponent with a life time of ~1.2 ns was attributed to monomeric porphyrin impurity (3 or 4) present in the dyad 9 and triad 1. The major component was the decreased lifetime of N 3 S porphyrin sub unit due to transfer of its energy to N 2 S 2 porphyrin subunit and also partly due to enhanced intersystem crossing because of heavy Ru(II) ion [11,12].…”

Section: Fluorescence Propertiesmentioning

confidence: 99%

Synthesis of unsymmetrical porphyrin triad containing three different porphyrin subunits assembled by covalent and non-covalent interactions

Punidha

Rai

Ravikanth

2008

J. Porphyrins Phthalocyanines

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Cis-21,23-dithiaporphyrin building block containing one iodophenyl and one pyridyl functional group at meso positions was synthesized by condensing unsymmetrical thiophene diol and symmetrical 16-thiatripyrrin under refluxing propionic acid conditions. The 21,23-dithiaporphyrin building block was coupled with mono-functionalized 21-thiaporphyrin building block containing meso-phenylethyne functional group under mild Pd(0) coupling conditions. The steady-state and time-resolved fluorescence studies support an efficient energy transfer in the singlet excited state from N 3 S porphyrin subunit to N 2 S 2 porphyrin subunit in the dyad. The N 3 S-N 2 S 2 porphyrin dyad was then treated with RuTPP(CO)(EtOH) in toluene at refluxing temperature and purified by column chromatography to afford a porphyrin triad containing N 3 S, N 2 S 2 and RuN 4 porphyrin subunits assembled using both covalent and non-covalent interactions. The photophysical properties showed the fluorescence quenching of N 3 S and N 2 S 2 porphyrin subunits in triad due to heavy ruthenium ion which was coordinated to meso-pyridyl 'N' of N 2 S 2 porphyrin subunit of porphyrin triad.

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Side-to-Face Ruthenium Porphyrin Arrays: Photophysical Behavior of Dimeric and Pentameric Systems

Abstract: d] rate constants are found to be in the 10 8 ± 10 9 s À1 range.

Cited by 102 publications

References 13 publications

A practical approach to the study of photoactive self-assembled porphyrin systems

A practical approach to the study of photoactive self-assembled porphyrin systems

Electronic Energy Transfer in a Multiporphyrin‐Based Molecular Box

Synthesis of unsymmetrical porphyrin triad containing three different porphyrin subunits assembled by covalent and non-covalent interactions

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