Rhenium complexes photochemistry

Most photosensitizers, however, are reasonably photostable compounds, and their optical properties have been studied in depth. In particular, there has been much interest in ruthenium-based photosensitizers such as [Ru(bpy)3]2+ and [Ru(phen)3]2+, due to their stability and absorption of visible light. Detailed information on their optical properties, including ground and excited state information in relation to photosensitization, has been reviewed by Creutz et al. [16]. Similarly, the photochemistry and photophysics of rhenium complexes, as discussed here, have been reviewed in detail by Kirgan et al. [7]. 

The photochemistry of rhenium complexes occupies a prominent position in the photochemistry of transition metal complexes. Along with early preparative studies on photosubstitution of carbonyl species like Re(CO)sX, the preparation of the remarkably stable yellow complex /ac-Re(CO)3(phen)Cl foreshadowed the discovery of the a large class of related luminescent materials by Wrighton and co-workers in the 1970s [ 1 ]. As pointed out by Vogler and Kunkley, the current photochemistry of rhenium complexes is rich, spanning eight oxidation states from formal Re(0) (for example, Re2(CO)io) to formal Re(VII) (for example MeReOs) [2],... 

Keywords Rhenium complex Photophysics Photochemistry Photocatalyst. 

Examination of the chemical, electrochemical, and spectroscopic behaviour of R3EM(C0)3L (R = Ph or Me, E = Ge or Sn, M === Mn or Re, L = phen or bpy) reveals that the lowest state is one in which an electron has been transferred from the HOMO, which has sigma E—M bonding character to the LUMO which is mainly localized on The rhenium complexes emit in fluid solution at room temperature, and the luminescence may be quenched by both electron acceptors and electron donors, as in reactions (5) and (6). No net photochemistry is observed... 

Abstract This review describes recent advances in the photochemistry of complexes of the element rhenium. It covers not only fundamental chemistry but the recent applications of these complexes to supramolecular chemistry, carbon dioxide reduction, bioinorganic chemistry, sensors, and light-emitting devices. 

Santos I, Paulo A, Correia JDG (2005) Rhenium and Technetium Complexes Anchored by Phosphines and Scorpionates for Radiopharmaceutical Applications. 252 45-84 Scheffer JR, Xia W (2005) Asymmetric Induction in Organic Photochemistry via the Solid-State Ionic Chiral Auxiliary Approach. 254 233-262 Schmidtchen FP (2005) Artificial Host Molecules for the Sensing of Anions. 255 1-29... 

Wrighton MS, Ginley DS. Photochemistry of metal-metal bonded complexes. II. The photochemistry of rhenium and manganese carbonyl complexes containing a metal-metal bond. J Am Chem Soc 1975 97(8) 2065-2072. 

Photophysics and Photochemistry of Organometallic Rhenium Diimine Complexes... 

Carbonyl Complexes of the Transition Metals Electronic Sfructme of Organometalhc Compounds Hydride Complexes of the Transition Metals Ligand Field Theory Spectra Manganese Organometalhc Chemistry Photochemistry of Transition Metal Complexes Rhenium Organometalhc Chemistry Rutheiuum Organometalhc Chemistry. 

Photochemistry of Rhenium(I) Complexes A. Photochemical CO Elimination Reaction of a Re(I)... 

The CO stretching vibrational bands of rhenium carbonyl complexes are useful spectroscopic probes for studying their electronic excited states. As these IR absorption bands reside in the frequency region where few absorption bands exist, their absorption cross section are large and the band frequencies are greatly influenced by the amount of electron density on the central rhe-nium(I). Therefore, transient IR absorption (TR-IR) measurements should be one of the ultimate tools for the study of the photophysics and photochemistry of the rhenium carbonyl complexes. 

Discussions have appeared of the photochemistry of some rhenium phosphite complexes such as trans. msi. ReCl3py2[P(OEt3) ],... 

---