Ruthenium(II) Bipyridyl Complexes with Cyclometalated NHC Ligands

Abstract

We present the synthesis and characterization of novel cyclometalated ruthenium N-heterocyclic carbene (NHC) complexes of the general formula [Ru(C^C*)(bpy)]PF (bpy = 2,2'-bipyridine), with the C^C* ligand being based on different 1-phenylimidazoles. They were synthesized in a one-pot procedure starting from the corresponding p-cymene NHC complexes [Ru(C^C*)(p-cymene)Cl]. Their structural, spectroscopic, and electrochemical properties were investigated by NMR, X-ray, UV/vis, and CV, as well as density functional theory methods. Because of the stronger electron-donating carbene ligands, these complexes represent a new class of bisheteroleptic dyes with improved photophysical and electrochemical properties.

Caesium for Perovskite Solar Cells: An Overview

“…LEDs, luminescent solar concentrators and related photonic technologies represent other platforms where Cs‐based perovskites can behave as core materials in combination with other recently emerged advanced concepts . In this scenario, Mn 2+ doping is currently considered one of the leading strategies to modify the optical and magnetic functionalities of nanocrystals of various chalcogenide and oxide semiconductors .…”

“…LEDs, luminescent solarc oncentrators and related photonic technologiesr epresent other platforms where Cs-based perovskites can behavea sc ore materials in combination with other recently emerged advanced concepts. [244][245][246][247][248][249][250][251][252][253] In this scenario, Mn 2 + doping is currently considered one of the leadings trategies to modify the opticala nd magnetic functionalitieso f nanocrystals of variousc halcogenide ando xide semiconductors. [254] An interesting synergy between these materials chemistry features was proposed by Yuan et al,w ho synthesized as eries of Mn 2 + -doped CsPbCl 3 nanocrystals using reaction temperature and precursor concentration to tune Mn 2 + content up to 14 %.…”

Cyclometalated Ruthenium(II) NHC Complexes with Imidazo[1,5‐a]pyridine‐Based (C^C*) Ligands – Synthesis and Characterization

“…However, the only examples of its use as C ^ C* cyclometalating NHC ligand have been reported for Ir III complexes from the groups of Mashima and Gong and for Pt II complexes from our group. To the best of our knowledge, no examples of ruthenium complexes with imidazo[1,5‐ a ]‐pyridine‐NHC ligands can be found in the literature, which is why we were –following our investigation of related phenylimidazol‐based complexes – interested in their synthesis, reactivity, and properties.…”

Bis‐Tridentate‐Cyclometalated Ruthenium Complexes with Extended Anchoring Ligand and Their Performance in Dye‐Sensitized Solar Cells.

“…Our recent studies show that although by these substituents higher efficient DSCs are possible, their redox irreversibility brings additional instability to the molecule . In this regard, search for the new ligand environments for ruthenium complexes with suitable photophysical properties is critical …”

“…[12] In this regard, search for the new ligand environments for ruthenium complexes with suitable photophysical properties is critical. [13][14][15] A tridentate ligand -2,6-bis(quinolone-8-yl)pyridine (dqp), which forms six membered chelating rings with the metal center has recently been under intense scrutiny. [16][17][18][19][20] Abrahamson et al observed that, at room temperature, the homoleptic ruthenium complex [Ru(dqp) 2 ] 2 + with two dqp ligands exhibits an excited state lifetime of 3.0 ms, while its [Ru(tpy) 2 ] 2 + (tpy = 2,2':6',2''-terpyridine) analogue's excited state lifetime is less than 1 ns.…”