75888-64-1Relevant academic research and scientific papers
Synthesis of one-dimensional metal-containing insulated molecular wire with versatile properties directed toward molecular electronics materials
Masai, Hiroshi,Terao, Jun,Seki, Shu,Nakashima, Shigeto,Kiguchi, Manabu,Okoshi, Kento,Fujihara, Tetsuaki,Tsuji, Yasushi
supporting information, p. 1742 - 1745 (2014/03/21)
We report, herein, the design, synthesis, and properties of new materials directed toward molecular electronics. A transition metal-containing insulated molecular wire was synthesized through the coordination polymerization of a Ru(II) porphyrin with an insulated bridging ligand of well-defined structure. The wire displayed not only high linearity and rigidity, but also high intramolecular charge mobility. Owing to the unique properties of the coordination bond, the interconversion between the monomer and polymer states was realized under a carbon monoxide atmosphere or UV irradiation. The results demonstrated a high potential of the metal-containing insulated molecular wire for applications in molecular electronics.
Redox Properties of Metalloporphyrin Excited States, Lifetimes, and Related Properties of a Series of Para-Substituted Tetraphenylporphine Carbonyl Complexes of Ruthenium(II)
Rillema, D. P.,Nagle, J. K.,Barringer, L. F.,Meyer, T. J.
, p. 56 - 63 (2007/10/02)
Excited-state and redox properties of Ru(p-XTPP)(CO), X = MeO, Me, H, F, Cl, H, and Br, have been defined.Emission bands were centered at 730 +/- 3 nm and excited-state lifetimes were in the range of 30 +/- 10 μs.Two one-electron oxidations in CH2Cl2 ranged from 0.74 to 0.86 V for the first step and from 1.18 to 1.27 V for the second one.A one-electron reduction process in (CH3)2SO ranged from -1.35 to -1,24 V.Excited-state lifetimes and redox potentials exhibit a weak dependence on the Hammet ?p function.In general, redox potentials increase as the electron-withdraving power of the substituents increases, whereas excited-state lifetimes decrease.The first oxidation step (0.74-0.86 V) and the reduction step are, respectively, assigned to ?-electron removal or acceptance by porphyrin ring.The second oxidation is assigned to removal of an electrone from the ruthenium(II) center.The excited state is shown to be T(?-?*) state of porphyrin ring and to exhibit photoredox behavior involving both oxidative and reductive quenching.Redox product separation occured in flash photolysis quenching experiments and back-reactions took place at near-diffusion-controlled rates.The redox potential of the Ru(TPP)(CO)+/* couple was estimated from emission and redox data to be -0.57 +/- 0.03 V; it was determined from oxidative quenching studies to be -0.56 +/- 0.10 V.Comparison to the excited-state properties of Ru(bpy)32+ is made, and the utility of porphyrin complexes as potential solar energy storage catalysts is examined.
