Preparation, isolation and electrochemical characterization of cobalt porphyrins with Ru(NH3)52 complexes coordinated to 4‐cyanophenyl substituents in the 5, 10, 15 and 20 positions on the porphyrin ring

Synthesis, Photophysical and Electrochemical Studies on Peripherally Ruthenated Tetraphenylporphyrin

“…It is to be noted that synthesis of these complexes using hydroxy as one of the coordinating ligand from the porphyrin makes the ruthenium chromophore moiety greatly affected by the porphyrin unit due to greater flexibility of the bent Ru-O bond with respect to the meso phenyl group. This makes the ruthenium chromophore disposed spatially closer towards the porphyrin ring unlike that of Anson [16][17][18][19], Toma and Araki [21], etc. Herein we report the synthesis, spectroscopic and electrochemical properties of the complexes.…”

“…In recent times, the physicochemical properties of tetraruthenated metalloporphyrins have been investigated. Its synthesis and photophysical properties of zinc porphyrin and cobalt porphyrin [11][12][13][14], electrocatalytic [15][16][17][18][19], analytical application [20] and DNA interactions [21,22] have been studied. The above mentioned results of peripherally ruthenated porphyrins have one common aspect, i.e., all compounds are based on meso-tetrapyridyl metalloporphyrins.…”

Molecular Materials and Devices: Developing New Functional Systems Based on the Coordination Chemistry Approach

“…131 Anson and co-workers, [124][125][126][132][133][134][135] have studied cobalt meso-tetra(pyridyl) and meso-tetra (4-cyanophenyl) 2+ ions, showing that the back-bonding from the ruthenium(II) and osmium(II) complexes plays an important role in the activation of the cobalt porphyrin center. 136 On the other hand, they also showed that the [Ru(NH 3 ) 5 ] 2+ modified cobalt porphyrin becomes a bielectronic catalyst 137 when in solution, revealing the importance of the electrode material or the arrangement of the molecules in the reaction pathway. Recently, however, a surprising efficiency has been reported for a rather simple molecule, such as the (5,10,15,20-tetramethylporphyrinato)cobalt(II) species.…”

Molecular materials and devices: developing new functional systems based on the coordination chemistry approach

“…131 Anson and co-workers, [124][125][126][132][133][134][135] have studied cobalt meso-tetra(pyridyl) and meso-tetra(4cyanophenyl) porphyrins bound to [Ru(NH 3 ) 5 ] 2+ or [Os(NH 3 ) 5 ] 2+ ions, showing that the back-bonding from the ruthenium(II) and osmium(II) complexes plays an important role in the activation of the cobalt porphyrin center. 136 On the other hand, they also showed that the [Ru(NH 3 ) 5 ] 2+ modified cobalt porphyrin becomes a bielectronic catalyst 137 when in solution, revealing the importance of the electrode material or the arrangement of the molecules in the reaction pathway. Recently, however, a surprising efficiency has been reported for a rather simple molecule, such as the (5,10,15,20tetramethylporphyrinato)cobalt(II) species.…”