The title compound, C18H14O2, is almost planar with a dihedral angle of 1.24 (2)° between the phenyl­ethynyl and styryl groups. The acet­oxy group is tilted by 82.46 (2) and 82.26 (3)° with respect to the benzene ring planes.

INTRODUCTIONThe solvent mixtures of water and dimethyl sulphoxide (DMSO) have special importance because of their unique physical and chemical 1,2 properties. With respect to the chemical properties, the formation of water-DMSO mixtures is exothermic with the magnitude of the heat of mixing showing a strong negative 3 deviation from ideality. Such as density, viscosity, refractive index 4-6 permittivity and surface tension show positive deviations from ideality. The solvation of sodium chloride and other electrolytes in several one component solvents has been a subject of detailed investigations, both theoretically and through simulations, for a considerably long time. Molecular dynamical simulation studies on NaCl in the presence of model 7-9 polar solvents, water, methanol and DMSO 10 have been reported.To our best of knowledge, dielectric study for this most 11 commonly used electrolyte (NaCl) has not been reported in mixed solvents such as water-DMSO. The objectives of the present work were to study the dielectric properties of three solutions of NaCl in mixtures of water and DMSO as a function of temperature and concentration. The information on dielectric properties of DMSO NaCl aqueous solution would be helpful to process industries to develop DMSO based polar solvents using microwave technology. EXPERIMENTAL DMSO (99.5 %) and NaCl (99.5 %) were purchased from the Chengdu Kelong Chemical Factory. A vector network analyzer Agilent N5230A, with an Agilent open-ended coaxial Dielectric properties of DMSO+NaCl aqueous solution were measured at the selected microwave frequency range (2.45 and 5.8GHz) by the open-ended coaxial probe method using a network analyzer. The effects of temperature (293-353K) and concentration (0.1-0.5 mol/L) on dielectric properties were investigated. Temperature and concentration significantly contributed on dielectric characteristics of DMSO dispersion and ion exhibited the electric conductivity dispersion effect.cable connected to a Agilent 85070E dielectric probe was employed to measure dielectric properties of DMSO + NaCl aqueous solution. The instrument was calibrated by measuring the properties of air, short-circuit block and water at 293 K. The instrument was turned on at least 2 h before the calibration to obtain precise results and measurements were made. The sample (ca. 40 mL) was placed in a wide glass tube (50 mL) and the open coaxial probe (probe diameter ≈ 20 mm) was inserted into the tube. The sample holder was dipped into a temperature controlled water bath with agitation. The network analyzer probe and the cable were fixed together so that there could be no movement during sample measurement and data acquisition. The sample was heated from 293-363 K and dielectric properties were measured while samples achieved the required temperatures (293-353 K). A temperature controller system with a water bath and thermostat was used to maintain the temperature constant within ± 0.5 K. The sample cell was surrounded by a heat insulating container through which the constant tempe...

Nonequilibrium molecular dynamics simulations are performed to investigate the effects of an external microwave field on aqueous solution of NaCl + methanol at different temperatures. The microwave wave propagates in the z-axis direction with a frequency of 2.45 GHz and the intensity of the microwave field is 3 × 10 5 V/m. The results indicate that as the temperature of the electrolyte solution increased, the diffusion coefficient gradually decreased, but the electric conductivity gradually increased. In addition, all three will be increased, when the temperature increased. But the value of them will be reduced when microwave field is applied.