A new family of lanthanide-based coordination polymers with azoxybenzene-3,3′,5,5′-tetracarboxylic acid as ligand

Highly Luminescent Europium-Based Heteroleptic Coordination Polymers with Phenantroline and Glutarate Ligands

“…On the other hand, extended conjugation provokes a red shift of the absorption band of the ligand that therefore can overlap the lanthanides' 4f−4f transitions and prevent their sensitization by an antenna effect. 25 Additionally, nonradiative de-excitation of the lanthanide ions, especially that of Eu 3+ ions, is very sensitive to the highenergy O−H or C−H vibrators in the vicinity of the lanthanide ions, 18 and more generally, a rigid molecular framework favors lanthanide luminescence. 26 Most often, only one ligand is used for the absorption of the excitation radiation as well as for connecting the lanthanide ions.…”

“…It is also commonly admitted that long intermetallic distances favor lanthanide luminescence by reducing the intermetallic quenching. , Therefore, on one hand, using long ligands with extended conjugation, and therefore high molar absorption, looks like a promising strategy as far as highly luminescent lanthanide-based coordination polymers are targeted. On the other hand, extended conjugation provokes a red shift of the absorption band of the ligand that therefore can overlap the lanthanides’ 4f–4f transitions and prevent their sensitization by an antenna effect …”

An iron-catalyzed nitrene transfer reaction of nitrosobenzenes with N-acyloxyamides for accessing N-acyl azoxy molecules

“…Azoxy molecules represent a category of important organic compounds that have broad applications, such as in anti-fungal and anti-cancer agents, 1 organic dyes, 2 polymers, 3 liquid crystals 4 and high-energy-density materials. 5 Traditional approaches to access azoxy compounds include oxidative coupling of anilines 6 and reductive coupling of nitroarenes.…”

Direct photochemical route to azoxybenzenes via nitroarene homocoupling

“…1,2 This compound, which carries an uncommon 1,3-dipolar O−NvN linkage with charges distributed over the three-atom set, is a valuable building block in the preparation of dyes and pigments, 3,4 as well as the development of liquid crystals [4][5][6][7][8][9] and polymeric materials. [10][11][12] In synthetic chemistry, the azoxy functionality can be exploited as an ortho-directing group in the C−H functionalization of arenes [13][14][15][16] and as the precursor for the Wallach rearrangement for the easy preparation of hydroxyazobenzenes. 1,[17][18][19][20][21][22] On the other hand, for medicinal chemistry applications, azoxybenzenes have shown potential for drug delivery, 23 and were recently studied as bioisostere of alkene and amide; 24 remarkably, several azoxyarene analogues of bioactive alkenes and amides showed comparable, promising anticancer activities.…”