The piperazine ring is an indispensable part of many biomolecules and can be easily modified through substitution on the ring nitrogen for desired application in pharmacology as well as metal binding studies.
Abstract Metal complexes with heterocyclic Schiff bases are of substantial curiosity for the chemists. Ligand modifications are easily accessible due to preparative simplicity, structural variability and tunable electronic properties. Hetero atoms like N and O when incorporated in Schiff bases play a key role at binding sites in metallobiomolecules Transition metals form an integral part of biological system and their mixed ligand complexes with Schiff bases have established their remarkable application in biocidal fields as antibacterial, antifungal, antiinflammatory and as anticancerous agents. Keeping in mind their marked biological activity, this work reports the synthesis and characterization of mixed ligand complexes of zinc and copper with Schiff base (obtained by the condensation of glyoxal with ortho and para anisidine) as primary and N, N’ donor molecules as secondary ligands.
Lignin is a significant renewable natural energy resource these days, used as an environmentally acceptable and sustainable alternative fossil fuel feedstock in a huge possibility of value-added products. Lignin is a polymeric molecule that possesses an aromatic unit structure, together with cellulose, and is a main component of the cell walls of plants. It is the byproduct of agriculture residues and biorefinery products and can be extracted from paper-pulp industries. Properties of lignin may differ depending on the extraction method and source and also on an aromatic ring as the main constituent of lignin in the structure. This rare composition of lignin makes it more valuable, allowing for value-added applications such as in the field of storage devices and energy harvesters. This review focuses on derivatives of lignin, structure and composition sources and characteristics, and its sustainable emerging application in various fields are discussed.
Abstract The present work reports the preparation and adsorption kinetics of a Zeolite@TiO 2 multifunctional adsorbent for the removal of heavy metal (Pb(II)) and organic pollutants (methylene blue) from wastewater. The design of the material is a core‐shell having a porous core of zeolite and the surface is supported with the growth of nano TiO 2 for a tunable surface and interface designing for efficient wastewater treatment. The formation of Zeolite@TiO 2 core‐shell has been characterized by XRD, XPS, SEM, TEM, and DRS spectroscopic techniques. BET surface analysis indicated increased surface area for efficient adsorption. The design of multifunctional adsorbent acts as a charged crossing point for quick adsorption and breakdown of pollutants in water. The adsorption of Pb(II) and methylene blue (MB) dye follows the Freundlich adsorption isotherm confirming presence of multilayer of TiO 2 in the adsorption process. Complete adsorption for Pb(II) is achieved in 25 minutes whereas MB dye is completely adsorbed within 15 minutes with high adsorption capacities. Photocatalytic degradation activity for MB dye were also analyzed and indicated 30 mg/l was degraded in 10 min. The DRS and photoluminescence life time study support good photocatalytic activity. The regeneration and recyclability of the core‐shell material have also been studied and reported.
Abstract This paper describes the synthesise of copper complexes of phenylpiperazine ring-based ligands and characterization via physical and spectroscopic methods. Structure of complexes has been proposed on the basis of UV-vis, IR and Mass fragmentation pattern and additionally supported by electrochemical and thermogravimetric analysis. Low molar conductance value of metal complexes in water and DMSO suggest non-ionic nature of complexes which is in agreement of proposed structure. TGA curve, where loss of coordinated solvent molecules starts early followed by loss of ligand itself also support the proposed structures. Percentage ash content analysis also indicate that only one copper metal is binding to the ligands reported here. Antibacterial activity of metal complexes has been performed by agar well diffusion method and indicated these metal complexes possess higher activity than the corresponding ligands. Binding interaction of these complexes were studied with BSA protein by UV-vis spectroscopic methods and binding constant was calculated which indicated that the complexes are having moderate affinity. Some complexes were also geometrically optimized to lowest energy ground state by using DFT calculations. Docking study of these optimized structures with BSA protein revealed these metal complexes exhibit hydrophobic interaction owing to the aromatic bulk in the ligand.
Abstract In human body, drug‐neurotransmitter interactions have been the most significant process. Whereas, adverse reactions may be accompanied by unexpected interaction, which puts an individual in danger of life. Thus, the interactions between adenosine (ADN) and sodium valproate (SV) with caffeine (CAF), theophylline (TPY) and γ‐amino butyric acid (GABA) have been studied. Various properties like densities, ρ and speed of sound, u , have been used to calculate apparent molar volumes ( V 2,ϕ ) and apparent molar isentropic compression ( K s,2,ϕ ) for ADN and SV in aqueous (5, 10, 15 and 20 mmol kg −1 ) CAF, TPY and GABA solutions at T = (288.15–318.15) K and at pressure p = 1 × 10 5 Pa. The results of various interactions that occurred by mixing the solutions have been interpreted. Exothermicity is indicated by the negative values of standard molar enthalpy of transfer, Δ tr Δ dil H 0 , obtained from the calorimetry. UV‐absorption and 1 H NMR studies suggest that there is a dominance of solute‐cosolute interactions due to hyperchromic shift and shielding effect.
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