New discotic-shaped azomethines with triphenylamine moieties: Thermal, structural behaviors and opto-electrical properties

Crystal Structure Determination of 4-[(Di-p-tolyl-amino)-benzylidene]-(5-pyridin-4-yl-[1,3,4]thiadiazol-2-yl)-imine along with Selected Properties of Imine in Neutral and Protonated Form with Camforosulphonic Acid: Theoretical and Experimental Studies

The crystal structure was determined for the first time for 4-[(di-p-tolyl-amino)benzylidene]-(5-pyridin-4-yl-[1,3,4]thiadiazol-2-yl)-imine (trans-PPL9) by X-ray diffraction. The imine crystallized in the monoclinic P21/n space group with a = 18.9567(7) Å, b = 6.18597(17) Å, c = 22.5897(7) Å, and β = 114.009(4)°. Intermolecular interactions in the PPL9 crystal were only weak C-H⋯N hydrogen bonds investigated using the Hirshfeld surface. The electronic and geometric structure of the imine were investigated by the density functional theory and the time-dependent density-functional theory. The properties of the imine in neutral and protonated form with camforosulphonic acid (CSA) were investigated using cyclic voltammetry, UV-vis and 1H NMR spectroscopy. Theoretical and experimental studies showed that for the 1:1 molar ratio the protonation occured on nitrogen in pyridine in the PPL9 structure, as an effect of Brönsted acid-base interactions. Thermographic camera was used to defined defects in constructed simple devices with ITO/PPL9 (or PPL9:CSA)/Ag/ITO architecture. In conclusion, a thermally stable imine was synthesized in crystalline form and by CSA doping, a modification of absorption spectra together with reduction of overheating process was observed, suggesting its potential application in optoelectronics.

Cyclohexadienone core 3,6-di-tert-butylcarbazole decorated triazole bridged dendrimers: synthesis, photophysical and electrochemical properties and application as an additive in dye-sensitized solar cells

An enhanced efficiency of 9.01% was realized for G₂ dendrimer based DSSC.

The development of the spatially correlated adjustment wavelet filter for atomic force microscopy data

In this paper a novel approach for the practical utilization of the 2D wavelet filter in terms of the artifacts removal from atomic force microscopy measurements results is presented. The utilization of additional data such as summary photodiode signal map is implemented in terms of the identification of the areas requiring the data processing, filtering settings optimization and the verification of the process performance. Such an approach allows to perform the filtering parameters adjustment by average user, while the straightforward method requires an expertise in this field. The procedure was developed as the function of the Gwyddion software. The examples of filtering the phase imaging and Electrostatic Force Microscopy measurement result are presented. As the wavelet filtering feature may remove a local artifacts, its superior efficiency over similar approach with 2D Fast Fourier Transformate based filter (2D FFT) can be noticed.

Substituted triphenylamines as building blocks for star shaped organic electronic materials

A series of star shaped organic semiconductors was synthesized and characterized. The applicability of these materials in organic electronic devices was demonstrated.

AFM study of the mechanical wear phenomena of the polyazomethine with thiophene rings: Tapping mode, phase imaging mode and force spectroscopy

Self-assembling molecules, which include polymers, copolymers, dendrimers, and hydrogen bonded complexes are widely studied for their great potential as advanced functional materials. This article presents an atomic force microscopy (AFM) study of polyazomethine with thiophene rings and ester groups (PAZ-Th). The specific morphological and mechanical properties of the polymer, such as ordered structures, as well as energy dissipation in scanning the tip-surface system related to those structures were found by using various AFM measurement techniques such as tapping mode, phase imaging mode and force spectroscopy. Moreover, changes in the long-range and short-range tip-sample interactions were observed by utilizing force spectroscopy mode. In addition, for the investigated polymer self-organized fiber-like structures showing mechanical wear properties were observed.