2-(2′-Hydroxyphenyl)-5-(4″-nonylphenyl)-1,3,4-oxadiazole and its beryllium complex

Synthesis and luminescent properties of 2-[2′-acyl(benzoyl)oxyphenyl]-5-(4″-nonylphenyl)-1,3,4-oxadiazole

“…A significant increase in the luminescence quantum yield of oxadiazole I derivatives was obtained by replacing the benzoyl group with acyl moiety and by increasing the energy of n-π*-levels in IIa (acetonitrile, λ f m l ax 353 nm, φ 0.91; isooctane , λ f m l ax 351 nm, φ 0.95). It should be noted that oxadiazole I luminesces with a low quantum yields (λ f m l ax 350-503 nm, φ 0.008-0.012) [6], which is caused by nonradiative deactivation of its excited state by ESIPT-mechanism [9,10].…”

“…For this purpose, we obtained acyl derivative IIa by acylation of 2-(2'-hydroxyphenyl)-5-(4''-nonylphenyl)-1,3,4-oxadiazole I [6] with acetic anhydride in the presence of a catalytic amount of 70% perchloric acid, and benzoyl derivative IIb by the action of benzoyl chloride in pyridine (Scheme 1).…”

Spectral Luminescent Properties of 3-[5-(4-Methoxyphenyl)-1,3,4-oxadiazol-2-yl]acrylic Acid and Its Complex with Zn(II)

“…Chelate complexes with oxadiazol ligands are widely used as metal complex luminophors [7,8] as well as emission and electron-transport materials for organic and light emitting diodes (OLED) [9].…”

Synthesis and spectral-luminescence properties of 2-[2-(pyridin-4-yl)vinyl]quinolines

“…They form stable complexes with majority of metals and they are often used as precipitants for separation of metal cations [2], highly selective fluorescent chemosensors [3], biologically active compounds [4], and components of efficient electroluminescent materials for organic light-emitting diodes (OLEDs) [5]. Fluorescence of 8-hydroxyquinoline is weak due to the photo-initiated excitedstate intramolecular proton transfer (ESIPT) [6][7][8]; however, the proton transfer can be blocked via complexation with metal ions or the 8-hydroxyl group esterification, thus enhancing the fluorescence [9,10]. Electronic π-π*-transfer in 8-hydroxyquinoline and its metal complexes significantly depends on the electronic parameters of the substituents in the quinoline ring; hence, fine tuning of the optical parameters as well as electronic and hole transport properties is possible via chemical modification of the ligand.…”