Assemblies multi-porphyrin

Iengo E, Scandola F, Alessio E (2006) Metal-Mediated Multi-Porphyrin Discrete Assemblies and Their Photoinduced Properties 121 105-143 Itoh M, Taniguchi H (2007) Ferroelectricity of SrTiC>3 Induced by Oxygen Isotope Exchange. 124 89-118... 

J3.8 Organic Solar Cells Composed of Multi-porphyrin/C60 Supramolecular Assemblies I 499... 

Fig. 13.23 Porphyrin dendrimers and the reference compound employed for construction of organic solar cells composed of multi-porphyrin/C60 supramolecular assemblies [91].

Non-Covalent Multi-Porphyrin Assemblies Synthesis and Properties Volume Editor Alessio, E. 

Two of the classical bis-nitrogen ligands to assemble porphyrins (predominantly zinc metallated) are the bidentate l,4-diazabicyclo[2.2.2]octane (DABCO) and 4,4 -bipyridine (bipy). Other di-topic nitrogen-ligands studied include hydrazine, 4,4 -bipyrimidine, diaza-pyrene, 5,5 -dicyano-2,2 -bipyri-dine, perylene-bisimide, extended bipyridine units and non-covalently linked di-pyridyl ligands via bipy-metal interactions. The formation of various bis-porphyrin and multiporphyrin assemblies using these versatile ligands were studied in detail by Sanders, Anderson, Hunter, Branda and many others. The structures of the supramolecular multi-porphyrin architectures are schematically represented in Fig. 9. 

These formation and dissociation equilibria can be used to manipulate the multi-porphyrin assemblies, as was demonstrated in the following experiments. A mixture of coordination polymer 52 and dimer 53 was dissociated by the addition of MeOH followed by simple evaporation. The GPC elution curves before (Fig. 24a) and after (Fig. 24b) the evaporation were completely different. The new peaks (1, 2, and 3) in Fig. 24b were separated and identified as oligomers terminated by monomeric porphyrins 54 (n = 0, 1, 2, and 3). This result demonstrates the possibility of controlling the length of the porphyrin array and terminating it with other imidazolyl zinc porphyrins... 

The introduction of supramolecular multi-porphyrin assemblies is expected to contribute significantly to the field of molecular electronic and photonic devices because of their excellent levels of light absorption and charge sep-... 

Metal-Mediated Multi-Porphyrin Discrete Assemblies and Their Photoinduced Properties... 

Multi-Porphyrin Adducts Assembled via one External Metal Fragment. . 110... 

Abstract The metal-driven construction of multi-porphyrin assemblies, which exploits the formation of coordination bonds between exocyclic donor site(s) on the porphyrins and metal centers, has recently allowed the design and preparation of sophisticated supra-molecular architectures whose complexity and function begin to approach the properties of naturally occurring systems. Within this framework, meso-pyridyl/phenyl porphyrins (PyPs), or strictly related chromophores, can provide geometrically well-defined connections to as many as four metal centers by coordination of the pyridyl peripheral groups. Several discrete assemblies of various nuclearities, in which the pyridylporphyrins are connected through external coordination compounds, have been constructed in recent years. In this review, we summarize recent work in this field from our and other laboratories. The photophysical properties of some ruthenium-mediated assemblies of porphyrins prepared by our group are also described. 

Keywords Multi-porphyrin assemblies Metal-mediated assemblies ... 

Design Strategy Multi-Porphyrin Assemblies Connected by Exocyciic Coordination to Metal Fragments... 

It should be noted here that information derived from solid state data of discrete metal-mediated multi-porphyrins arrays is crucial for a better im-derstanding of the preferred geometry of the system, the flexibility of the building blocks, the inter- and intra-moleciflar interactions, and thus for assessing their potentialities for further exploitation (e.g., host-guest interactions, higher order assemblies). 

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