10198-96-6Relevant articles and documents
Resonance raman spectra and photophysical properties of ruthenium complexes with the 3,3′-bipyridazine ligand
Gardner, Joseph S.,Strommen, Dennis P.,Szulbinski, Witold S.,Su, Haiquan,Kincaid, James R.
, p. 351 - 357 (2003)
This report documents the spectroscopic and photophysical properties of the complexes, Ru(bpdz)32+ and [Ru(bpy)2(bpdz)]2+, where bpdz = 3,3′-bipyridazine and bpy = 2,2′-bipyridine. Specifically, the complexes were characterized by UV-visible, emission, resonance Raman (RR), and transient resonance Raman (TR3) spectroscopic data, as well as lifetime measurements. The RR spectrum of the Ru(bpdz)32+ complex documents the characteristic modes of the coordinated ligand, whereas the RR spectra of the heteroleptic complex, [Ru(bpy)2(bpdz)]2+, obtained at judiciously chosen excitation wavelengths, reveal selective enhancement of either bpy modes or bpdz modes, depending upon the particular excitation wavelength, permitting definitive assignment of the observed electronic absorption bands and establishing the lowest energy electronic transition as having a Ru-to-bpdz charge-transfer character. The TR3 spectrum of the Ru(bpdz)32+ complex reveals the characteristic frequencies of the coordinated bpdz-· anion radical, as expected, whereas corresponding studies of the heteroleptic complex, [Ru(bpy)2(bpdz)]2+, reveal these characteristic bpdz-· modes in the absence of any modes attributable to bpy-· anion radicals, providing definitive evidence for the [Ru(III)(bpy)2(bpdz-·)]2+ formulation of the excited state of this complex. Lifetime measurements for both complexes, made over a wide range of temperatures and interpreted with a model derived from previous measurements made on a large number of similar complexes, indicate that the two complexes of interest decay by different nonradiative pathways resulting from thermal population of a ligand field 3dd and/or a lower lying 4th 3MLCT state.
Tuning the Electrochemical and Photophysical Properties of Osmium-Based Photoredox Catalysts
Beck, Logan R.,Bedná?ová, Eva,Goldschmid, Samantha L.,Joe, Candice L.,Li, Jun,Ravetz, Benjamin D.,Rovis, Tomislav,Tay, Nicholas E. S.,Xie, Katherine
supporting information, p. 247 - 258 (2022/02/05)
The use of low-energy deep-red (DR) and near-infrared (NIR) light to excite chromophores enables catalysis to ensue across barriers such as materials and tissues. Herein, we report the detailed photophysical characterization of a library of Os∥polypyridyl photosensitizers that absorb low-energy light. By tuning ligand scaffold and electron density, we access a range of synthetically useful excited state energies and redox potentials. 1 Introduction 1.1 Scope 1.2 Measuring Ground-State Redox Potentials 1.3 Measuring Photophysical Properties 1.4 Synthesis of Osmium Complexes 2 Properties of Osmium Complexes 2.1 Redox Potentials of Os(L)2-Type Complexes 2.2 Redox Potentials of Os(L)3-Type Complexes 2.3 UV/Vis Absorption and Emission Spectroscopy 3 Conclusions.
