Electrochemiluminescent dinuclear Ru(II) complexes assembled with 1,1′-(1,2-ethynediyl)- or dimethlyene-bridged bis(bipyridine) ligands: Synthesis and photophysical and electrochemical properties

Quaterpyridines as Scaffolds for Functional Metallosupramolecular Materials

“…107 Formation of the monoanion of 6-methyl-2,2′-bipyridine can be achieved only by using LDA (tBuOH and NaNH 2 are too weak, and BuLi is nonselective), and it can then be oxidatively coupled using Br 2 , I 2 , or BrCH 2 CH 2 Br. In contrast, its isomer 1,2-di(2,2′-bipyridin-5yl)ethane has been obtained by a substitution reaction between ([2,2′-bipyridin]-5-ylmethyl)lithium and 5-(bromomethyl)- 2,2′-bipyridine, 109 which shows that a spacer can be introduced separately or as a part of a functionalized N 2 moiety.…”

“…154 Molecular structure of [Cu 2 (26) 2 ](PF 6 ) 2 and its highly symmetric crystal lattice in the solid state (red frame). 41 X-ray crystal structure of P-[Ag 2 (109) 2 ](PF 6 ) 2 and its highly symmetric crystal packing (blue frame). 155 intramolecular interactions between the R 1 and R 2 substituents on the helical pitch, although no simple dependencies, such as an increase in the amount of one isomer upon introduction of bulkier groups, were observed (e.g., Interestingly, where some selectivity was observed, it involved a preference for the HH isomer, and a similar preference was observed with enantiopure bornyloxy-substituted 2,2′:6′,2″terpyridines and their Cu(I) and Ag(I) helicates in the solution, although it was shown that crystal packing forces in the solid state can overcome the observed effect.…”

“…The Cu(I) complex is shown as its P-enantiomer, and the Ag(I) complex is shown as its Menantiomer.154 Molecular structure of [Cu 2(26) 2 ](PF 6 ) 2 and its highly symmetric crystal lattice in the solid state (red frame). 41 X-ray crystal structure of P-[Ag 2(109) 2 ](PF 6 ) 2 and its highly symmetric crystal packing (blue frame) 155.…”

Electrogenerated chemiluminescence from newly synthesized α-diimine-ligated heteroleptic iridium(III) complexes

“…Yield: 50%, 1 [Ir(2-(2,4-difluorophenyl)pyridine) 2 (L)](PF 6 ) derivatives were synthesized by modification to a previously reported method [33][34][35][36][37][38][39][40][41][42]. A solution of [Ir(dfppy) 2 (Cl)] 2 (122.4 mg, 0.2 mmol) and L (0.4 mmol) dissolved in a mixture of dichloromethane and ethanol (v/v = 3:1, 10 mL) was refluxed for 5 h. The reaction was monitored by TLC.…”

“…In recent years, we have developed efficient ECL materials, which are mostly ruthenium(II)-based complexes with various α-diimine ligands including multinuclear Ru(II) complexes assembled with polyamine dendrimers [33][34][35][36][37][38][39][40][41][42]. Owing to the success of α-diimine ligands to ruthenium(II) complexes in our previous studies, we became specially interested in the possibility of utilizing these ligands to iridium(III) to extend the study on ECL materials.…”