Synthesis, characterization, and cytotoxic activity of some new 1,3,4-trisubstituted pyrazoles against diverse tumor cell lines

Study of physiochemical properties of trisubstituted pyrazole derivatives using polar aprotic solvents

Pyrazole derivatives are aromatic heterocyclic compounds endowed with multifaceted applications. In the present study 1,3,4-trisubstituted pyrazoles derivatives have been synthesized for the purpose of studying their physical properties and their characterization was done by FTIR, 1H NMR and 13C NMR spectroscopic technique. The measurement of densities (ρ) and viscosities (η) of solutions of substituted pyrazole derivative in polar aprotic solvent i.e., Dimethyl sulfoxide (DMSO), nitromethane (NM) as well as in their 1:1 binary mixture (DMSO + NM) was done at 310 K over a wide range of solute concentration (5-100) × 10-4 mol dm-3. The experimental results were used to determine the excess molar volumes ( V m E ) . The data of density-viscosity revealed the dipole-dipole interactions occurred between the pyrazole derivative (solute) and the solvent (DMSO, NM). Excess molar studies ( V m E ) revealed that solute-solvent interaction was found to be stronger in case of nitromethane solvent.

Synthesis, structural and antimicrobial studies of binary and ternary complexes of a new tridentate thiosemicarbazone

A new thiosemicarbazone ligand was synthesized and characterized using spectroscopic techniques (UV-Vis and IR) and synchrotron x-ray powder diffraction. With M²⁺ = Mn²⁺, Zn²⁺ and Cd²⁺, coordination compounds of the type (M[L]₂) were isolated. In the presence of sodium dithiocarbamate salts (NadiEtdtc.3H₂O = sodium diethyldithiocarbamate trihydrate and Napipdtc = sodium piperidinedithiocarbamate), Zn²⁺ and Cd²⁺ were able to form ternary octahedral complexes where each metal binds a deprotonated (thiosemicarbazone) ligand, a monobasic dithiocarbamate ligand and a water molecule. In vitro biological evaluation tests of the free HL ligand and its metal complexes against selected fungal and bacterial cultures were performed. Compared with HL, the complexes displayed enhanced biological activities and ternary Zn (II) complexes displayed comparable antibacterial activities to the chloramphenicol standard.