Structure and tuneable luminescence in polymeric zinc compounds based on 3-(3-pyridyl)-5-(4-pyridyl)-1,2,4-triazole

Driving the Emission Towards Blue by Controlling the HOMO‐LUMO Energy Gap in BF2‐Functionalized 2‐(Imidazo[1,5‐a]pyridin‐3‐yl)phenols

“…The corresponding resonances in the 13 C NMR spectra were identified between 116 and 132 ppm (aromatic CH) and at about 9-10 ppm for the methyl group (Figures S4-S35). The 19 F NMR spectra (CD 2 Cl 2 , 25°C) exhibit a non-binomial quartet around À 140 ppm, with a coupling constant 1 J F-B � 15 Hz due to the coupling with 11 B. The small shoulder appearing downfield from the main resonance was attributed to the resonance of 19 F bound to 10 B (unresolved Jcoupling).…”

“…In order to offer a valid alternative to these efficient but high-cost compounds, the interest has been moved to low-cost organic dyes [9] and to coordination compounds of cheaper metals, usually in a d 10 electronic configuration, such as copper(I) [10] or zinc(II). [11,12] Boron is also another interesting element which is known to give fluorescent coordination compounds, [13][14][15] with boron dipyrromethene (BODIPY) being the most renown and studied derivatives. [16] Thanks to their photophysical properties, these species are known to play a significant role in numerous application fields, ranging from biomolecular probes [17] to optoelectronic.…”

Highly Luminescent 4H-1,2,4-Triazole Derivatives: Synthesis, Molecular Structure and Photophysical Properties

“…The involved n-type orbital originates from the nitrogen atom of the triazole ring (N1 or N2) and the source of the π-type orbital is also the triazole ring [71]. The lowest unoccupied molecular orbital in similarly conjugated 1,2,4-triazole compounds is antibonding delocalized orbital (π*), which most often is the benzene ring directly attached to the triazole ring [72] or fused π* orbital of triazole and the neighboring benzene [73]. The presence of a single fluorescence maximum or two fluorescence maxima of the same emission wavelength indicates that π*→π transitions are responsible for the fluorescence in the studied compounds [74].…”

Determination and application of the excited‐state substituent constants of pyridyl and substituted phenyl groups

“…Pyridyl is a common organic group, therefore the organic compounds containing pyridyl have been widely studied and applied in Medicine, [ 1–3 ] photochemistry, [ 4–6 ] and electrochemistry. [ 7,8 ] For example, pyridyl disulfide functionalized polymers were applied to nanotherapeutic platforms, [ 9 ] the kinase inhibitors based on an o‐aminopyridyl alkynyl scaffold were took as potential treatment for inflammatory disorders, [ 10 ] pyridyl‐benzimidazoles were used as chemical tools to probe cancer, [ 11 ] and the complexes formed via pyridyl derivatives and different metals were applied to biological antibacterial activity [ 12,13 ] and catalysis.…”

“…[ 14 ] Also pyridyl is an aromatic group and has good optical activity. [ 4–6 ] If an aromatic group is connected with a second substituted phenyl ring through the vinylene linkage, the molecule with long chain‐conjugated system (such as stilbene and 1‐furyl/thienyl‐2‐arylethylene derivatives) will be formed, which plays an important role in photochemistry. [ 15–17 ]…”