Synthesis and Optical Properties of a Series of Green‐Light‐Emitting 2‐(4‐Phenylquinolin‐2‐yl)phenol–BF₂ Complexes (Boroquinols)

Abstract

On the tip of the tung(sten): The title catalysts selectively perform deoxygenation of vegetable‐oil‐based feeds by either decarboxylation/decarbonylation or hydrodeoxygenation (HDO) pathways, depending on the dominant tungsten phase (WO3 and W2C). The process upgrades vegetable‐oil‐based feeds, under a hydrogen atmosphere, to high‐value olefinic products, thus providing a significant advantage over other types of deoxygenation catalysts.

Synthesis and Characterization of Oxazaborinin Phosphonate for Blue OLED Emitter Applications

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 XRD studies of similar structures show that the basic oxazaborinin molecule class tends to form π-π stacking in the solid state, [34] which can lead to fluorescence quenching. [13,14,19,20,35] An approach of introducing bulky side substituents is used to overcome this problem. Indeed, the X-ray crystal analysis of compound 4 reveals that the alignment of diethylphosphonate groups between layers reduces the formation of the π-π stacking between phenyl or pyridine rings ( Figure 2) compared to a basic oxazaborinin molecule class.…”

“…oxazaborinin molecules exhibit promising fluorescence quantum yields for OLED-emitters. [20,34] The PL spectra of the bladed thin film of compound 4 is given in Figure 5. and shows two emission maxima at λ = 428 nm and λ = 500 nm.…”

“…[6] Although, boron complexes with N,N-chelating ligands (e. g. BODIPYs) are well investigated and widely used as fluorescent dyes, their less investigated N,O-analogues are becoming increasingly important because of their stronger emission in solid state. [18][19][20][21][22][23] Compared to widely used N,O-ligands, such as 8-hydroxyquinolines, pyridylphenolates have a less conjugated system which results in blue emission (hypsochromic effect). [24] Indeed, only few blue emitters of four-coordinate boron with pyridylphenolate ligands have been reported in the literature [25,26] and additional investigations are needed.…”

Boroquinol Complexes with Fused Extended Aromatic Backbones: Synthesis and Optical Properties

“…With much lower acid concentrationt he amount of dearylation product 6a as well as the formation of desired phenanthridine 4a was diminished:A na cid concentration of 1vol% led to low conversions to 4a (25 %; Table 1, entry 4). To suppress the oxidation pathway, the reactions were performed with variousa cid concentrationsu nder argon atmosphere ( Table 1, entries [5][6][7][8][9]. With acidc oncentrationsa sh igh as 50 vol %, the dearylated product 6a becomes the main prod-Scheme1.Reactionof2-aminobiaryl 1a with aldehydes 2 or 3 under various conditions( see Ta ble 1).…”

Synthesis and fluorescent properties of boroisoquinolines, a new family of fluorophores

“…Minuti and co-workers designed boranyls for biological application by the ring opening of isoxazoles to 10 equipped with an acetylene tail in order to the click labeling of azidoproteins. 34 Only one member of the boranyls derived from coumarins (11) showed weak uorescence but on the contrary, the phosphorescence of those was remarkable ( 36,37 From naphthalene dialdehyde multiboranyls (14) were synthesized, but the larger molecule size caused lower uorescence. 38 Nevertheless, a nice red shi was obtained with a wide range of quantum yield (Table 1, entry 6).…”