Organic LEDs Based on Bis(8-hydroxyquinoline) Zinc Derivatives with a Styryl Group.

For the first time, organic light-emitting diodes (OLEDs) based on bis(8-hydroxyquinoline) zinc with a styryl group (ZnStq) dispersed in poly(N-vinylcarbazole) matrix (ZnStq_R:PVK, where R = H, Cl, OCH) were fabricated. The ZnStq_R:PVK films made via the spin-coating method were used as the active layer in these devices. The produced OLEDs showed strong electroluminescence with yellow emissions at 590, 587 and 578 nm for the ZnStq_H:PVK, ZnStq_Cl:PVK and ZnStq_OCH:PVK, respectively.

Spectroscopic Studies of Styrylquinoline Copolymers with Different Substituents.

The aim of the study was to present the influence of various styrylquinoline (StQ) substituents on the luminescence, structural, and optical properties of StQ-containing copolymers. StQ-containing copolymers were synthesized by free-radical thermoinitiated polymerization. The calculations of the copolymerization ratios for the obtained copolymers were based on the basis of the integrated peak areas of the H NMR spectra in CDCl.

Distance Effects of Phenylpiperazine-Containing Methacrylic Polymers on Optical and Structural Properties.

New materials based on methacrylic polymers modified with 1-(4-nitrophenyl)piperazine side chains, differing in the distance of the chromophore from the polymer main chain and/or the separation between the chromophoric units in the chain, are obtained and characterized in terms of their potential applications in optoelectronic devices. The surface, structural, and optical properties of the investigated materials are determined using atomic force microscopy, spectroscopic ellipsometry combined with transmission measurements, Raman and Fourier transform infrared spectroscopy, as well as cyclic voltammetry. The relevant model systems are additionally analyzed with quantum chemical density functional theory calculations in order to enable the generalization of the structure-photophysical property relationships for the optimization of the material features.

The effect of pyrazidol on the central serotonergic system.

Pyrazidol (PRZ), 10 mg/kg, stimulated the flexor reflex of hind paw of the spinal rat in approx. 40% of preparations. This stimulation was abolished by a central serotonin blocking agent, cyproheptadine, but unchanged by an agent inhibiting the uptake of 5-hydroxytryptamine, clomipramine.

Synthesis and pharmacological properties of N-aroyl-beta-(1-indanyl)-ethylamines.

Six new N-acyl derivatives of beta-(1-indanyl)ethylamine were obtained. The most active of them, N-(m-chlorobenzoyl/-beta-1-indanyl)-ethylamine (compound 2), decreased the 5-HTP-induced head twitches in mice and the tryptamine-induced syndrome in rats, attenuated the quipazine-induced stimulation of the hindlimb flexor reflex in spinal rats, and reduced the immobility time in mice in the behavioral despair test. All these effects might be indicative of the antidepressive properties of compound 2.