A novel oligo-pyrazole-based thin film: synthesis, characterization, optical and morphological properties

Abstract

Pyrazole-3,4-dicarboxylic acid 2 was synthesized via the hydrolysis of pyrazole-3-carboxylic acid 1 and subsequently heated with thionyl chloride to give the novel pyrazole-3,4-dicarbonyl dichloride 3, which was easily converted into oligo-pyrazole 4 upon its reaction with p-phenylene-diamine. These newly synthesized compounds were characterized by 1H-NMR, 13C-NMR, and FT-IR spectroscopy, and gel permission chromatography (GPC). Three novel oligo-pyrazole thin films were prepared using oligo-pyrazole 4 with these respective values of thickness: 20, 21, and 24 μm. The optical properties of the films, including the absorbance, transmittance, and optical band gap, were determined using UV-vis spectroscopy. The Eg values of the films were found to be 1.426, 1.537, and 1.648 eV for the 20, 21, and 24 μm thick organic films, respectively. Atomic force microscopy (AFM) was used to examine the surface morphology and properties of the organic films. In the AFM images, a few black regions were observed and several yellow regions appeared over a large area, and the surface of the oligo-pyrazole films had an extremely low roughness value. The as-synthesized oligo-pyrazole has great potential in optoelectronic applications according to the optical properties of the as-prepared films. Graphical abstract Electronic supplementary materialThe online version of this article (10.1007/s00396-018-4342-7) contains supplementary material, which is available to authorized users.

Some pyrazoles derivatives: Potent carbonic anhydrase, α‐glycosidase, and cholinesterase enzymes inhibitors

“…In addition to these areas, pyrazole derivatives have been successfully used in many fields such as pharmacy, agriculture, electronic industry, etc. They are used in a wide variety of agriculture industry as pesticides and insecticides agents and as pharmaceutical designers in industrial fields such as pharmacy and also are used in the technology industries to optical properties . For example, polymers containing pyrazole group are too useful for optoelectronic devices such as light emitting diodes and transistors due to low band gap …”

“…They are used in a wide variety of agriculture industry as pesticides and insecticides agents [21] and as pharmaceutical designers [22] in industrial fields such as pharmacy and also are used in the technology industries to optical properties. [23] For example, polymers containing pyrazole group are too useful for optoelectronic devices such as light emitting diodes and transistors due to low band gap. [24] Diabetes mellitus (DM) is well defined as a main health difficulty associated with enhanced mortality and morbidity and wide health care costs.…”

Novel family of bis-pyrazole coordination complexes as potent antibacterial and antifungal agents

“… 11 The construction of these complexes depends on the effect of hydrogen bonding, 12 donor atoms, 13 counter anions, 14 solvent 15 and the topologies of the selected ligand. 16 In addition, such organic molecules were found to exhibit various properties, be pharmacological, 17 chemosensory and photophysical, 18 optical and morphological properties, 19 to name but a few. Thus, coordination complexes formed with pyrazole building blocks may offer excellent compounds for the exploration of new functionalities and investigation of chemical and electronic behaviours.…”

Experimental and Computational Validation of Structural Features and BSA Binding Tendency of 5‐Hydroxy‐5‐trifluoromethyl‐3‐arylpyrazolines**

“… [10–16] The applicability of this class is not only restricted to biological applications but also as chelating and extracting reagents for many metal ions [17] . Various fluorescent dyes, polymers, insecticides, antioxidants and liquid crystals consist of pyrazole as one of the building blocks [18–23] . Moreover, complex heterocycles have been designed using pyrazole based synthetic templates.…”