Designing a new vanillin Schiff base (Z)-4-((2-hydroxy-3-methoxy benzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one: Synthesis, characterization, crystal structure and biological studies

1110-1116Novel Schiff base containing antipyrine and o-vanillin has been synthesized and characterized by various physicochemical techniques such as FTIR, UV-Vis, CHN, 1Hand 13C NMR spectral studies. The thermal behavior of the title compound has been examined with Thermogravimetric-Differential thermal analysis (TG-DTA). The structural properties have been further examined by single crystal X-ray diffraction studies. The X-ray diffraction data shows that the compound contains four molecules in the asymmetric unit. Antifungal activity of the compound has been carried out for four different fungi Aspergillus niger, Aspergillus flavus, Aspergillus terrus and Fusarium Sp at three different concentrations, whereas the compound shows significant activity against the fungi Aspergillus niger

Designing a new vanillin Schiff base (Z)-4-((2-hydroxy-3-methoxy benzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one: Synthesis, characterization, crystal structure and biological studies

Novel Schiff base containing antipyrine and o-vanillin has been synthesized and characterized by various physicochemical techniques such as FTIR, UV-Vis, CHN, 1Hand 13C NMR spectral studies. The thermal behavior of the title compound has been examined with Thermogravimetric-Differential thermal analysis (TG-DTA). The structural properties have been further examined by single crystal X-ray diffraction studies. The X-ray diffraction data shows that the compound contains four molecules in the asymmetric unit. Antifungal activity of the compound has been carried out for four different fungi Aspergillus niger, Aspergillus flavus, Aspergillus terrus and Fusarium Sp at three different concentrations, whereas the compound shows significant activity against the fungi Aspergillus niger.

Ethyl 6-amino-5-cyano-2,4-bis­(4-methyl­phen­yl)-4H-pyran-3-carboxyl­ate

In the title compound, C23H22N2O3, the pyran ring adopts a twisted boat conformation. The tolyl rings and carboxyl­ate group are attached to the pyran ring with torsion angles of −77.1 (2), 59.5 (3) and 17.8 (3)°, respectively. The ethyl group is disordered over two orientations with a site-occupancy ratio of 0.508 (5):0.492 (5). In the crystal, mol­ecules are linked by N—H⋯N and N—H⋯O hydrogen bonds, generating a chain running the a axis. Weak C—H⋯O, C—H⋯N and C—H⋯π inter­actions are also observed

4-Chloro­anilinium 3-carb­oxy­prop-2-enoate

In the title compound, C6H7ClN+·C4H3O4 −, the cations and anions lie on mirror planes and hence only half of the mol­ecules are present in the asymmeric unit. The 4-chloro­anilinium cation and hydrogen maleate anion in the asymmetric unit are each planar and are oriented at an angle of 15.6 (1)° to one another and perpendicular to the b axis. A characterestic intra­molecular O—H⋯O hydrogen bond, forming an S(7) motif, is observed in the maleate anion. In the crystal, the cations and anions are linked by N—H⋯O hydrogen bonds, forming layers in the ab plane. The aromatic rings of the cations are sandwiched between hydrogen-bonded chains and rings formed through the amine group of the cation and maleate anions, leading to alternate hydro­phobic (z = 0 or 1) and hydro­philic layers (z = 1/2) along the c axis

Bis(2,6-diamino­pyridinium) bis­(hydrogen oxalate) monohydrate

The asymmetric unit of the title compound, 2C5H8N3 +·2C2HO4 −·H2O, contains two crystallographically independent 2,6-diamino­pyridinium cations, a pair of hydrogen oxalate anions and a water mol­ecule. Both 2,6-diamino­pyridinium cations are planar, with maximum deviations of 0.011 (2) and 0.015 (1) Å, and are protonated at the pyridine N atoms. The hydrogen oxalate anions adopt twisted conformations and the dihedral angles between the planes of their carboxyl groups are 31.01 (11) and 63.48 (11)°. In the crystal, the cations, anions and water mol­ecules are linked via O—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional network

Tensile behaviour and characterization of amine treated nanoclay reinforced epoxy/polyurethane blends and composites for shape memory applications

435-442Polymer nanocomposites are the better choice for most of the applications because of its less weight and tailorability to suit different applications. Several nanocomposites have been fabricated with nanoparticles reinforcement and fibre reinforcement. But most of them were made to satisfy few criteria or one or two functions. Shape memory polymers composites (SMPCs) and blends exhibit novel properties that are different from the conventional materials and thus can be utilized in various applications. These composites are needed for applications such as smart clothing, flexible displays, stretchable circuits, strain gauges, implantable devices, high-stroke microelectromechanical systems (MEMS), and actuators where both mechanical properties and shape memory properties are important. The processing and characterization of these materials with nanoparticles produces better mechanical properties. Epoxy is the resin having good mechanical properties, when blended with polyurethane and nanoparticles fillers exhibit shape memory properties. This paper gives the fabrication and characterization methods for shape memory polymer composites developed with amine treated nanoclay as reinforcement and analyses tensile behaviour and moisture absorption and surface characteristics. Fourier transform infrared spectroscopy (FTIR) is used to identify the bond and functional groups and thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC) are done to identify the glass transition temperature and scanning electron microscope (SEM) analysis for studying the morphology and tensile test is done to test the stress-strain behaviour. The reinforcement has shown significant improvement in glass transition temperature and mechanical properties compared to pure shape memory polymers

Evaluation of drug likeliness of (Z)-4-((4-hydroxy-3-methoxy benzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one by computational analysis against coronavirus and T-cells of immune system

559-567The Schiff base (Z)-4-((4-hydroxy-3-methoxy benzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazole-3- one (VAP) has been synthesized by the condensation of 4-aminoantipyrine with vanillin and and characterized by FT-IR, 1H and 13C NMR spectroscopy. The structure of the synthesized compound has been confirmed by single-crystal X-ray diffraction studies, which shows that four units of the compound are in an asymmetric part of the crystal structure. The potential activity of synthesized Schiff base compound has been determined by molecular docking with T-cells (6bnk) and against Coronavirus (6lu7)

Structural, optical, thermal, dielectric and mechanical studies of a new organic NLO material: L-isoleucinium p-toluenesulfonate monohydrate (LIPT)

In the present work, a new organic second order NLO material: L-isoleucinium p-toluenesulfonate monohydrate (LIPT) is synthesized and reported for the first time. The LIPT is crystallized in a non-centrosymmetric monoclinic space group P21. Structural and hydrogen bond nature of the compound is analyzed using single crystal X-ray diffraction studies. The crystal exhibits very good optical properties such as wide optical transparency in the region of 210 nm to 1100 nm and the ultraviolet wavelength emission (λ = 283 nm). The second harmonic generation efficiency is found to be 1.7 times the standard KDP. Good thermal, mechanical properties and low dielectric constant at high frequency range show that the material may be a potential candidate for optoelectronic applications

2-Nitroanilinium bromide

The title compound, C6H7N2O2+·Br−, is isomorphous with 2-nitroanilinium chloride and contains an characteristic intramolecular N—H...O hydrogen bond, forming an S(6) motif. Intermolecular N—H...Br hydrogen bonds occur in the crystal structure. Two zigzag chains of C21(4) motifs extend along the b-axis direction. These primary chain motifs intersect like a double helix structure, leading to R63(12) ring motifs, which are arranged in tandem along the b axis. Hence, hydrophilic layers are generated at z = 1/4 and 3/4, which are sandwiched between alternate hydrophobic layers across z = 0 and 1/2

4-Sulfamoylanilinium perchlorate

In the crystal of the title salt, C6H9N2O2S+·ClO4−, the components are linked by N—H...O hydrogen bonds, forming a three-dimensional network. The cations are connected along a and b axes, leading to linear and zigzag C(3) and C(8) chain motifs, respectively. A cation–anion interaction along the c axis leads to a C22(12) chain motif. R33(18) and R33(20) ring motifs are observed as cation–anion-type interactions. These hydrogen-bonding ring and chain motifs are localized at z = 0 or 1, leading to alternate hydrophilic and hydrophobic regions along the c axis as a result of the stacking of anions and the aromatic cationic parts