http://nopr.niscair.res.in/handle/123456789/9015 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/9616 Title: Infrared spectra of charge transfer complexes of bis(N-phenylsalicylaldiminato) Cu^II <br/> <br/>Authors: Prajapati, J H; Patel, S G; Oza, A T <br/> <br/>Abstract: The charge transfer complexes of bis(N-phenylsalicylaldiminato) Cu^II with organic acceptors like TCNQ, TCNE, TNF, DDQ, chloranil, and iodine are prepared and studied with Fourier transform infrared spectroscopy. The spectrum of the donor chelate shows systematic steps in transmission above 2500 cm^-1, which are analyzed by its first-derivative. Fine structure is also seen pronounced in the charge transfer complexes. Two or three electronic absorption envelopes are identified in all the complexes. The nature of transitions (whether direct or indirect), band tailing effects and free-carrier absorption are also analyzed. TNF complex shows free-carrier absorptions in a very wide range above 1800 cm^-1. <br/> <br/>Page(s): 572-580 http://nopr.niscair.res.in/handle/123456789/9615 Title: Ultrasonic study of human cerebrospinal fluid <br/> <br/>Authors: Palaniappan, L; Velusamy, V <br/> <br/>Abstract: Human cerebrospinal fluid (CSF) has been is collected from various individuals of both sex including infants. Sound velocity and density have been measured in these samples and acoustical properties such as adiabatic compressibility and acoustic impedance have been calculated. The observed variations have been used to interpret the possible interaction among the components of CSF. It has been found that age and sex play an important role in deciding the sound velocity in CSF. The restriction in wave propagation is observed due to the change of structure of protein molecules of CSF. A specific reduction in sound velocity is observed in aged female subjects, which has been attributed to the increase in specific protein AZ 68. lack of estrogen is reflected in CSF analysis. <br/> <br/>Page(s): 591-594 http://nopr.niscair.res.in/handle/123456789/9614 Title: Spectroscopic and transport studies of Cu²⁺doped in (30-<i>x</i>)Na₂O-<i>x</i>NaF-50B₂O₃-20Bi₂O₃ glass system<b style=""></b> <br/> <br/>Authors: Suresh, Swapna S; Chandramouli, V <br/> <br/>Abstract: ESR, optical absorption, IR and dc electrical conductivity of (30-<i>x</i>)Na₂O-<i>x</i>NaF-50B₂O₃-20 Bi₂O₃ glass system have been investigated. From infrared results, it is observed that the glass is made up of [BO₃] and [BO₄] units and in fluorine rich glass B-F bonds are formed. ESR results show that Cu²⁺ has tetragonal distortedoctahedral coordination and its ground state is d_x²_-y². The observed changes in spin-Hamiltonian parameters with increasing concentration of NaF can be attributed to the decrease in the field strength at Cu²⁺ ion site .The decrease in a value can be attributed to decreasing ionic character of the glass. The existence of maxima of optical absorption at <i>x</i> =18 mole% of NaF is attributed to the formation of BO₂F₂ structural units. The dc electrtrical conductivity studies show that mobile ions are Na⁺ and the activation energy is attaining a maximum value at <i>x</i> =18 mole% of NaF characterizing a mixed anion effect. <br/> <br/>Page(s): 560-564 http://nopr.niscair.res.in/handle/123456789/9613 Title: FT-Raman, FTIR spectra and normal coordinate analysis of 5-bromo-2-nitropyridine <br/> <br/>Authors: Sundaraganesan, N; Ilakiamani, S; Saleem, H; Mohan, S <br/> <br/>Abstract: The Fourier Transform-Raman and Fourier Transform-Infrared spectra of 5-bromo-2-nitropyridine have been recorded. The observed frequencies were assigned to various modes of vibrations on the basis of normal coordinate calculations, assuming C_S point group symmetry. The potential energy distribution associated with normal modes is also reported here. The assignment of fundamental vibrations agrees well with the calculated frequencies. <br/> <br/>Page(s): 585-590