182319-00-2

Upstream product

• 15862-18-7 5,5'-dibromo-2,2'-dipyridyl 
• 98-80-6 phenylboronic acid 
• 1131-48-2 3-phenylpyridine N-oxide 
• 107351-82-6 2-bromo-5-phenyl-pyridine 
• 1008-88-4 3-phenylpyridine 

Downstream Products

• 102869-28-3 osmium(II)tris(5,5'-diphenyl-2,2'-bipyridine)⁽²⁺⁾ 

Relevant academic research and scientific papers

A spectroscopic study of some substitued tris(diimine) complexes of ruthenium(II) and their reduction products

The electronic absorption and resonance Raman spectra of the parent and one- to six-electron reduction products of tris(5,5'-bis(ethoxycarbonyl)-2,2'-bipyridine)ruthenium(II) and tris(5,5'-bis(phenyl)-2,2'-bipyridine)rythenium(II) indicate that the redox

Synthesis and reductive electropolymerization of metal complexes with 5,5′-divinyl-2,2′-bipyridine

Eight transition-metal complexes with 5,5′-divinyl-2,2′- bipyridine (5,5′-dvbpy) or 4,4′-divinyl-2,2′-bipyridine (4,4′-dvbpy) have been synthesized and studied. The ruthenium complexes [Ru(5,5′-dvbpy)(bpy)2]2+, [Ru(5,5′-dvbpy)(4, 4′-dpbpy)2]2+, and [Ru(5,5′-dvbpy)(5,5′- dpbpy)2]2+ (bpy = 2,2′-bipyridine; dpbpy = diphenyl-2,2′-bipyridine) with one 5,5′-dvbpy ligand have been successfully deposited on electrode surfaces by reductive electropolymerization. The resulting films are stable and adherent and show well-defined redox processes. In contrast, the complex [Ru(4,4′-dvbpy)(bpy)2] 2+ does not polymerize under the same conditions. Complexes [Ru(5,5′-dvbpy)2(bpy)]2+ and [Ru(5,5′-dvbpy) 3]2+ with two or three 5,5′-dvbpy ligands have been polymerized as well. As a result of increasing degrees of entanglement, the resulting polymeric films show larger charge-trapping currents and smaller apparent diffusion constants than films of [Ru(5,5′-dvbpy)(bpy) 2]2+. The electrochemical properties of the iridium complex [Ir(5,5′-dvbpy)(ppy)2]+ (ppy = 2-phenylpyridine) and the rhenium complex [Re(5,5′-dvbpy)(CO) 3Cl] have been studied. The former complex can be polymerized, but the films show an irreversible anodic process. The latter complex does not polymerize under the same conditions. Additionally, characterizations of the above polymeric films using FTIR, SEM, and spectroscopic techniques are presented.

Mechanistic insights into the potassium: Tert -butoxide-mediated synthesis of N-heterobiaryls

We report herein that symmetrical and non-symmetrical N-heterobiaryls are produced by a potassium tert-butoxide-mediated dimerization of heterocyclic N-oxides. The reaction is scalable and transition metal-free, and can be carried out under thermal and microwave conditions. Preliminary mechanistic studies point to the involvement of radical anionic intermediates arising from the N-oxide substrates and potassium tert-butoxide.

Role of substitution on the photophysical properties of 5,5′-diaryl-2,2′-bipyridine (bpy*) in [Ir(ppy) 2(bpy*)]PF6 complexes: A combined experimental and theoretical study

The synthesis of a family of 4′-functionalized 5,5′-diaryl-2, 2′-bipyridines (bpy*; 6a-6g) is reported. These ligands were reacted with the dimer [(ppy)2IrCl]2 (ppyH = 2-phenylpyridine) and afforded, after subsequent counterion exchange, a new series of luminescent cationic heteroleptic iridium(III) complexes, [(ppy)2Ir(bpy*)] PF6 (8a-8g). These complexes were characterized by electrochemical and spectroscopic methods. The crystal structures of two of these complexes (8a and 8g) are reported. All of the complexes except for 8c and 8f exhibit intense and long-lived emission in both 2-MeTHF and ACN at 77 K and room temperature. The origin of this emission has been assigned by computational modeling to be an admixture of ligand-to-ligand charge-transfer [3LLCT; π(ppy) → π*(bpy*)] and metal-to-ligand charge-transfer [ 3MLCT; dπ(Ir) → π*(bpy*)] excited states that are primarily composed of the former. The luminescent properties for 8a-8c are dependent upon the functionalization at the 4′ position of the aryl substituents affixed to the diimine ligand, while those for 8d-8g are essentially independent because of an electronic decoupling of the aryls and bpy due to the substitution of o,o-dimethyl groups on the aryls, causing a near 90° angle between the aryl and bipyridyl moieties. A combined density functional theory (DFT)/time-dependent DFT study was conducted in order to understand the origin of the transitions in the absorption and emission spectra and to predict accurately emission energies for these complexes.