IOSR-JAP   Volume-4 ~ Issue-1 ~ May–June 2013

Abstract: Sulphanilamide is the parent compound of all the sulpha-durgs which is important in urinary tract infections and meningococcal meningitis profilaxes. Ultrasonic velocity measurements are highly sensitive to molecular interactions and used to provide qualitative informations about the physical nature and strength of the molecular ∕inter-ionic interactions. In the present work, non-aqueous solutions of Sulphanilamide have been prepared with different concentrations and the experiments were carried out from a low temperature of 50c to a high temperature of 550c. The ultrasonic velocity data combined with density and viscosity provides the standard means for determining the internal pressure, free volume and acoustical parameters. The various interactions occurring in the solutions are interpreted interms of ion-ion and ion-solvent interactions. An attempt is made to identify the entry of solvate into the samples and the entry of drug molecules into the solvate which supports to identify the molecular structure.

Keywords : Acoustical parameters, free volume, Internal pressure, ion-solvent interactions ,ion-ion interactions.

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Abstract: The spectroscopic methods of the different regions of the Electromagnetic spectrum are the most powerful and useful techniques available for the understanding of molecular structure, nature of bonding between atoms, confirmation analysis, symmetry of molecules, ions in crystals and so forth. The high resolution IR spectroscopic studies have recently received a great thrust due to the advent of advanced Fourier transform spectrometers. In the present investigation the spectral changes are studied in the vibrational spectra of thiourea, thiosemi carbazide in non aqueous solvent. The H2N stretching vibrations observed at 3371cm¯¹, 3259cm¯¹, & 3156cm¯¹ indicated that 3 different types of NH2 groups arising out of tautomeric form. The results obtained from the present study confirm that the solute – solvent interactions occurring in the solution is through intermolecular H- bonding.

Keywords – Dimeric structure, Hydrogen bonding, Thiosemicarbazide, Thiourea.

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Abstract: In this paper a linear relationship in stellar optical spectra has been found by using a spectroscopical method used on optical light sources where it is possible to organize atomic and ionic data. This method is based on a new intensity formula in optical emission spectroscopy (OES). Like the HR-diagram , it seems to be possible to organize the luminosity of stars from different spectral classes. From that organization it is possible to determine the temperature , density and mass of stars by using the new intensity formula. These temperature, density and mass values agree well with literature values. It is also possible to determine the mean electron temperature of the optical layers (photospheres) of the stars as it is for atoms in the for laboratory plasmas. The mean value of the ionization energies of the different elements of the stars has shown to be very significant for each star. This paper also shows that the hydrogen Balmer absorption lines in the stars follow the new intensity formula.

Keywords: Astrophysics, Emission Spectroscopy Linear, Relationships

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