Intramolecular Hydrogen Bonding Rigidifying Flexible Bridge for Solution- and Vacuum-Processed TSCT-TADF Emitters.

To realize strong donor-acceptor face-to-face stacking for efficient through-space charge transfer-type thermally activated delayed fluorescence, a conceptually new design strategy is proposed to couple flexible bridges with adequate rigidity via built-in intramolecular hydrogen bonds (IHBs). The resulting emitter ACE-CN has a planarized benzyl methyl ether bridge self-anchored by the C-H···O IHB and shows a high photoluminescence quantum efficiency of 93%. The solution- and vacuum-processed devices exhibited high external quantum efficiencies of 11.

Rose Bengal inhibits β-amyloid oligomers-induced tau hyperphosphorylation via acting on Akt and CDK5 kinases.

Rationale: Tau hyperphosphorylation and aggregation is considered as a main pathological mechanism underlying Alzheimer's disease (AD). Rose Bengal (RB) is a synthetic dye used for disease diagnosis, which was reported to inhibit tau toxicity via inhibiting tau aggregation in Drosophila. However, it was unknown if RB could produce anti-AD effects in rodents.

6-Methyl-2-pyridyl N-acetyl-1-thio-β-d-glucosa-minide methanol monosolvate.

In the title compound, C(14)H(20)N(2)O(5)S·CH(4)O, the pyran-ose and pyridine rings are linked through an S atom. The pyran-ose ring has a normal chair conformation. An intra-molecular O-H⋯N hydrogen bond occurs.

6-Methyl-pyridine-2(1H)-thione.

There are two unique mol-ecules in the asymmetric unit of the title pyridine-thione derivative, C(6)H(7)NS, each of which adopts the thione rather than the mercaptan form. The rings in both mol-ecules are essentially planar, with maximum deviations from the least-squares planes through all non-H atoms of 0.021 (2) and 0.

Di-tert-butyl 3,3'-(2,2'-bi-1H-imidazole-1,1'-di-yl)dipropanoate.

In the title compound, C(20)H(20)N(4)O(4), the complete molecule is generated by a crystallographic centre of symmetry. The conformation is stabilized by two intramolecular C-H⋯N links.

3,3'-(2,2'-Bi-1H-imidazole-1,1'-diyl)dipropanol.

In the title compound, C(12)H(18)N(4)O(2), unlike other unconjugated disubstituted biimidazole derivatives reported so far, the two imidazole rings in a trans conformation exhibit a large planar rotation angle of 51.27 (4)°, and consist of half-mol-ecule asymmetric units related by a twofold rotation. The mol-ecules are linked into a three-dimensional framework with a parallel laminated construction via O-H⋯N and C-H⋯O inter-actions.

Bis(2,2'-biimidazole-κN,N')bis-(2-bromo-fumarato-κO)copper(II).

In the title compound, [Cu(C(4)H(2)BrO(4))(2)(C(6)H(6)N(4))(2)], the central Cu(II) atom lies on an inversion center and is six-coordinated in an octahedral geometry by four N atoms from two chelating biimidazole mol-ecules in the equatorial plane and two O atoms from two 2-bromo-fumarate ligands in the axial positions. O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds lead to a three-dimensional network.

[Lanthanide ion luminescence probe: low temperature phase transition of EuS4N complex].

Fluorescence spectrum of EuS4N complex at low temperature is very different from that at room temperature. When temperature changes, shapes of both excitation and emission spectra change dramatically at about 160 K, which is taken as an indicator of the structural change of EuS4N. Peak splitting of 5D0-->7F0 also indicates that there are two different types of coordination structure for Eu3+ ions at low temperature, while only one at room temperature.