Unprecedented Coordination-Induced Bright Red Emission from Group 12 Metal-Bound Triarylazoimidazoles

Abstract

Arylazoimidazoles are important dyes which were intensively studied in the past. In contrast, triarylazoimidazoles (derivatives which carry aryl substituents at the imidazole core) received almost no attention in the scientific literature. Here, we report a new family of simple and easily accessible triarylazoimidazole-group 12 metal complexes, which feature highly efficient photo-luminescence emission (Φ up to 0.44). Novel compounds exhibit bright red emission in solution, which could be excited with a visible light.

Adducts of 2-Pyridylselenenyl Halides and Nitriles as Novel Supramolecular Building Blocks: Four-Center Se···N Chalcogen Bonding versus Other Weak Interactions

“…The N–Se distance for 3 – 14 falls in the interval between 1.825(4) Å and 1.862(6) Å and is typical for the N–Se single bond. The CN separation (1.26(1)–1.286(6) Å for 3 – 14 ) corresponds to a typical double bond. − Interestingly, the C–Se separation for 3 – 14 (1.861(6)–1.89(1) Å) is less than the standard single C–Se bond distance (1.90 Å), but longer than the double CSe separation (1.82 Å), which indicates a significant back-donation of the selenium electron pair to the pyridinium ring.…”

Towards Anion Recognition and Precipitation with Water-Soluble 1,2,4-Selenodiazolium Salts: Combined Structural and Theoretical Study

“…The C=N bond lengths (1.27–1.30 Å for 5 – 7 ) are typical for C=N double bonds [ 10 , 11 , 13 , 14 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Other covalent bonds in 5 – 7 are unremarkable.…”

Exploring Supramolecular Assembly Space of Cationic 1,2,4-Selenodiazoles: Effect of the Substituent at the Carbon Atom and Anions

“…The N–Se distance for 3 – 10 was in the interval between 1.824(3) Å and 1.860(4) Å, and was typical for the N–Se single bond. The C=N separation (1.25(1)–1.291(5) Å for 3 – 10 ) corresponded to a typical double bond [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”