Aggregation-induced emission generation via simultaneous N-alkylation and rhenium(I) tricarbonyl complexation for 2-(2-thienyl)imidazo[4,5-f][1,10]-phenanthroline

A fundamental role of the solvent polarity and remote substitution of the 2-(4-R-phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline framework in controlling the ground- and excited-state properties of Re(i) chromophores [ReCl(CO)3(R-C6H4-imphen)]

“…The impact of remote N-donor substituents in complexes [ReCl(CO) 3 (R-C 6 H 4 -imphen)] was also investigated theoretically, with the use of density functional theory (DFT). The geometry optimization shows a good agreement with the structural parameters of complex 4 and related [ReCl(CO) 3 (Br-thiophene-imphen)], 66 whose crystal structures were determined using X-ray analysis (Table S8†). Notably, the N-donor substituents introduced into the 2-phenyl-1 H -imidazo[4,5- f ][1,10]phenanthroline skeleton gave rise to negligible changes in the bond lengths and angles in the resulting Re( i ) complexes 1–4 .…”

“…41–46 The vast majority of these coordination compounds have potential uses in anticancer therapy, 26–28,31,34–37,39–46 bioimaging, 32,47 the conversion of solar energy, 22,29 organic light-emitting diodes, 21,23,48–50 photoredox catalysis, 38,51,52 and luminescence sensing. 30,38,53–56 Surprisingly, little attention has been paid to Re( i ) carbonyl chromophores with 1 H -imidazo[4,5- f ][1,10]phenanthrolines, 47,49,57–66 in contrast to phenanthroline Re( i ) carbonyl complexes [Re(CO) 3 X(N∩N)] n + ( n = 0 or 1), which have a very rich history in coordination chemistry and largely contribute to the understanding of photophysical and light-induced electron-transfer and electronic energy-transfer processes. 67–74 In this study, we present Re( i ) tricarbonyls with the 1 H -imidazo[4,5- f ][1,10]phenanthroline (imphen) functionalized with electron-donating amine groups attached to the imidazole ring via phenylene linkages.…”

Synthesis, Optical and Electrochemical Properties of Isomeric Dibenzophenanthroline Derivatives

“…Additionally, the large Stokes shift and long fluorescence lifetime (see below) are typical characteristics for excimer formation. [28][29][30][31] Therefore, the larger Stokes shift in DBP3 is due to a complex configuration rearrangement of excited states. This comparison indicates how the N substitution in different position of dibenzophenanthrolines can modulate their optical properties.…”

An aggregation induced emission active bis-heteroleptic ruthenium(ii) complex for luminescence light-up detection of pyrophosphate ions

“…43,44 To date, most of the AIEgens are based on organic compounds, while metal complex-based AIEgens are still rare. 41,45,46 Among metal complex-based AIEgens, although Ir( iii ), 47–52 Pt( ii / iv ) 53–55 and Re( i ) 56–58 complex-based AIEgens have been widely studied, Ru( ii ) complex-based AIE materials are very rare. 47,59–61 A series of AIE-active cyclometalated iridium( iii ) complexes were developed by Huang et al 62,63 and Park et al , 64 where the RIM of the aromatic rings and π–π stacking between adjacent aromatic rings blocked the non-radiative decay from the triplet MLCT/LLCT/IL excited states, leading to PL enhancement.…”