Abstract of Volume 18(3), 2007

Kinetics and mechanism of oxidation of methyl esters of substituted mandelic acids
Naomi P. Ndahi
phone: 08023552881
Abstract: Oxidation studies of methyl esters of substituted mandelic acids by Lead tetracetate (LTA) was carried out and kinetic study was done in case of methyl mandelate (a-H  and a-D). Kinetic isotopic effect and thermodynamic parameters were evaluated. The results obtained suggest a plausible mechanism of oxidation of substituted mandelic acid esters.

A novel route to synthesis silica hollow spheres having ZSM-5 structure in absence of template
N. Venkatathri
Abstract: A novel route to synthesize silica hollow spheres with thick walls having ZSM-5 structure without using template at 140°C was presented. X-ray diffraction (XRD), Scanning electron microscopy (SEM), TG/DTA, FT-IR and nitrogen adsorption were employed to characterize the morphology and microstructures of the as-prepared silica hollow spheres. Experimental results indicated that the hollow spheres had an average diameter of nearly 40 nm with a surface area of 342 m2/g.             
Key words: Silica hollow spheres; ZSM-5; Microstructure; Synthesis.

Synthesis, characterization and spectroscopic study of Cu (II) complex with Ciproflaxacin
Pawan Kumar, Veena Arora* and Ram Naresh Sharma
Abstract: The interaction of Cu (II) with quinolone drug ciprofloxacin has been investigated of formula [Cu2(CP)2(BPY)2(PIP)].6H2O (BPY = 2,2'-bipyridyl, CIP = 1-cyclopropyl-6-4­-oxo-1,4-dihydro quinoline-3-carboxylic acid, PIP = piperazinyl anion). The complex crystallizes in the triclinic system, space group P-l. Our result based on the elemental analysis, FTIR spectroscopy, crystall-ographic data’s. The Cu (II) ion displays a five coordinated square pyramidal coordination with two nitrogen doors from BPY, the 4- ­keto and 3-carboxylate oxygen donors of CIP, the third nitrogen atom of the PIP anion occupying the fifth site. The changes observed in some bands of interacted compound indicated that there is a weak interaction between two molecules.
Key words: Synthesis, charaeterization, ciprofloxacin, FTIR, quinolone, crystal structure.

Metal Complexes with 1,5-diamino 4- methyl 5-aza -4- penten 2-one (DMP) as ligand
R.R. Jha and P. Mukharjee
Abstract: Metal complexes of the type, [M3 (DMP)2 X6 (H2O)4] [where M= Ni2+, Co2+, Mn2+, DMP= 1,5- diamino 4- methyl 5-aza -4- penten 2-one X= Cl, NO3– & C1O4–] have been synthesised in neutral medium. The ligand is coordinated to metal ion through azomethin nitrogen as indicated from i.r. spectra. Octahedral geometry have been pro­posed for the complexes on the basis of magnetic susceptibility and electronic spectral study. Thermal analysis of all the complexes show similar pattern of decomposition. Weight loss takes place in one step, ~ l 75°C with exothermal peak in D.T.A. curve which corresponds to loss of four water molecules which show that water moleculs are coor­dinated to metal ions. Fungicidal screening of the complexes show them active against ASPERGILLUS NIGER, FUSARIUM ORYSPORIUM and HELMlNTHOS- PORIUM  ORYZAE. These complexes are less active then thio complexes.              

A novel synthesis procedure and its characterization of silica nanosphere
N. Venkatathri
Abstract: Three different procedures are reported for the synthesis of silica nanosphere. In all the method either agglomeration time, addition of hetero atom or use of surfactants plays a vital role. In absence of it give a full fledged crystal. This method is applicable to, irrespect of template, aluminium and silica source. The particles are in nanosphere with size in range from 100 to 500 nm. It is a convenient procedure than the conventional non-aqueous media synthesis.               
Key words: Aluminosilicate, Nanospheres, Hydrothermal synthesis, XRD, SEM, TG/DTA, FT-IR and MASNMR.     

Solvent effect on electronic transitions of 1-bromo-3-fluoro-4-iodobenzene
B.S. Yadav, I.A. Siddiqui, Seema* and Amit Kumar Yadav
Abstract: The present paper contains the electronic absorption spectra of 1-bromo-3-fluoro-4-iodobenzene.The effect of solvents viz (ethanol, methanol and water) is also been studied and discussed on the electronic transitions of the said molecule. The spectra has been recorded in the region 200-400 nm.               
Key words: Electronic spectra and solvent effect. 

Vibrational spectral studies of 4-Hydroxy -2- Methyl quinoline
B. S.  YADAV*, P. K. SHARMA* and NIDHI SHARMA
Abstract: The vibrational spectra (IR and Raman) of  4-hydroxy-2-methyl quinoline have been recorded in the region 400 - 4000 cm-1 and 40 - 4000 cm-1 respectively. The assignments of fundamentals are proposed and discussed by assuming the molecule under Cs point group symmetry. Hydrogen bonding and tautomeric behaviour of the molecule have also been discussed.    
Key words : Infrared and Raman spectroscopy, vibrational frequencies, 4-hydroxy-2-methyl quinoline.           

Analyzing the Effect of Four Wave Mixing Including First- and Second-order Dispersion Parameters in Wavelength Division Multiplexing (WDM) Systems
Amarpal Singh, Ajay K. Sharma#, T.S. Kamal* and Vishal
Abstract: In this paper a modified analysis of phase matching factor for Four Wave Mixing (FWM) by incorporating the higher order dispersion parameters have been reported. Further an intensity-dependent phase-matching factor has been calculated. With the help of modified formula for FWM crosstalk under the effect of first- and second-order dispersion parameters at different transmission length, effective fiber core areas and different input channel powers have been analyzed. It is also shown that under the combined effect of first- and second-order dispersion parameters, the cross talk introduced by FWM reduces. Our calculations are more accurate and feasible than that of the results reported earlier. Moreover in this paper we analyzed the effects of individual and combined first- and second-order dispersion parameters at linear phase matching factor and intensity-dependent phase-matching factor that has not been discussed earlier.               
Key words : FWM, Dispersion, Core effective area and channel spacing.            

Ftir and laser Raman spectrum of 1-bromo-4- chloro-2-nitrobenzene
B.S. Yadav, I.A. Siddiqui, Seema* and Sanjay Yadav
Abstract: The FTIR and Laser Raman Spectrum of 1-bromo-4-chloro-2- nitrobenzene have been recorded  in the region 4000-400 cm-1  and 4000-50 cm-1 respectively . Both the spectrum have been analyzed on the basis of Cs point group symmetry and the observed bands have been assigned to the different specific modes of vibrations.  The assignment of FTIR and Laser Raman bands of the said molecule are made on the basis of magnitude and relative intensities of the observed bands. The assignment made for complex molecule under investigation are in good agreement with the earlier work on some benzene derivatives.               
Key words: FTIR and Laser Raman spectra, 1-bromo-4-chloro-2- nitrobenzene, vibrational assignments.         

Dissociation constants of some schiff bases
Shipra Baluja, Nikunj Kachhadia, P. K. Kasundra and K. P. Vaishnani
Abstract: The proton ligand dissociation constants of some Schiff bases and the stability constants have been determined in dioxane-water (60:40 v/v) medium at 308.15 K. using Bjerrum-Calvin pH titration as extended by Irving and Rossotti. The stability constants are related to dissociation constants of these ligands, which depends on the substituents attached to the organic moiety.               

Study of the structure and properties of lightly crosslinked polyethylene crystallized from the melt under uniaxial compression
1B.B. Acharya, S. Tripathy2 and G.S. Roy3
Abstract:  “Structure and properties of lightly crosslinked polyethylene crystallized from the melt under uniaxial compression” have been studied. The observations indicate that if a lightly crosslinked polyethylene of adequate crosslink density is uniaxially compressed from the melt and cooled to room temperature a very unique orientation of the crystal planes appears. This crystallisation of molecular chains takes place in the absence of high pressure and shear. This is due to the intrinsic crystallographical structure of polymer.          
Key words : Uniaxial compression, Compression ratio, Small angle X-ray scattering.                         

Impurity concentration calculations in detector-grade silicon using Deep Level Transient Spectroscopy
M. AHMED1, S. J. WATTS2, ANDREW HOLMES-SIEDLE2, J. MATHESON2 and M.A. H.CHOWDHURY1
Abstract: Deep Level Transient Spectroscopy (DLTS ) is one of the most important technique by which defect with deep levels are characterized. Using the data  measured by DLTS technique we have calculated the concentration of oxygen and carbon in float zone and epitaxial  diodes. The calculated values were then compared with the values those measured by Infrared absorption (IR) and  Secondary Ion Mass Spectroscopy  (SIMS)  for these materials. A reasonable good agreement is obtained in all cases except in the epitaxial diodes. The results showed that the epitaxial material is compensating. Canberra epi-MACOM diode processed by MACOM Ltd., USA, seems to be highly compensated.              
Key words: Defects in Silicon, DLTS, Silicon Diodes and substrate, Radiation Damages.   

High temperature electrical conductivity, Seebeck coefficient and dielectric constant of ZnMoO4
A.N. Thakur, U.P. Singh S.C. Kumar and Akil Ahmad
Abstract: This paper reports the measurements of electrical conductivity, Seebeck coefficient and dielectric constant of Zinc molybdate in the temperature range 300 to 1200K. It is found that the compound is an n-type semiconductor with energy band gap 2.94eV. From electrical conductivity and Seebeck coefficient data, we have estimated the activation energy and charge carrier mobility which show that the conduction is of the normal band type.         

Physico-chemical and Bio-chemical Studies on some organic disulphide complexes with Manganese(II), Chromium(III) and Oxovanadium(IV) ions
R. N. Sharma*, Piyush Mishra (Mrs) Alpana Kumari and Rajnish Kumar Chauhan
Abstract: Some solid and air stable complexes of di-triazole-5,5’disulphide (TTDS) with manganese(II), chromium(III) And oxovanadium(IV) have been prepared and characterized using various physical and spectral method. They have also been screened for their antimicrobial activities.         
Key words : Coordination compound, magnetic moment, blue shift, red shift, antimicrobial activity, etc.                          

12C - 12C and 12C - 27A1 Total Reaction Cross Section in the Rigid Projectile Model
L. A. Al-Khattabi
Abstract: Working within the framework of Coulomb modified Glaubar theory we calcu­late 12C - 12C and 12C - 27Al total reaction cross sections in the energy range from 10 ~ 1000 MeV/nucleon in the rigid projectile model in terms of the phe­nomenological N - 12C amplitude parameters. A comparison of the predictions of the model with the available experimental data shows that it works quite sat­isfactorily at energies above about 20 MeV/nucleon.                     

Effect of pressure and temperature on complex of Zr (IV) with tetrathiazyl dihydrofluoride (TTA dhf)
h.k. sharma
Abstract: A complex of S4N4H2F2 with ZrOCl2 has been synthesized by refluxing ZrOCl2 and S4N4H2F2 in equimolar ratio in alcohol. The complex has composition (S4N4H2F2ZrOCl2)2. When it is kept at 373oK and 1.72x105dyn/cm2 in an autoclave a new species entirely different in structure and properties is obtained which has the composition (S4N4HFZrOCl2)3. From their quantitative estimation, IR, UV EPR spectra and XRD diffractometric analysis, it is concluded that the complex (S4N4H2F2ZrOCl2)2 is a N- coordinated dimer, while the (S4N4HFZrOClO2)3 is a permagnetic complex having covalently linked Zr (IV) with antipodal N atoms of S4N4H2F2 and triclinic unit cells Both complexes are semiconductors.                               

Opto-electrical studies of rare earth doped (Cd-Pb)S films
P. Bose
Abstract: The present paper reports some interesting observations on photoconductivity studies of different (Cd-Pb)S films prepared by simple techniques. The high gain ( Ipc/Idc ratio) observed for such materials show potential for future applications. Results of photoconductivity rise and decay, optical absorption and photoconductivity excitation spectra, XRD and SEM are presented for different (Cd-Pb)S films. The ratio of saturated photocurrent of rise curves (Ipc) to dark current (Idc) is found to be of the order of 105 for (Cd0.95-Pb0.05)S films. Band gaps determined from the optical absorptions and photoconductivity excitation spectra gave similar results. The direct band gap nature is found for mixed films. From the XRD studies a combination of cubic and hexagonal structure are found. Lattice constants calculated from XRD studies agree well with the standard data. The SEM studies show growth of cabbage and leafy structures.                 

Synthesis, Characterization and Antimicrobial studies on VO2(I), VO(II), V(V) and ZrO(II) Complexes with 4-Amino-3-propyl-5-Mercapto-S-Triazine
R.N. Sharma*, Rajnish Kumar Chauhan, Yogesh Kumar Pandey and Alpana Kumari
Abstract Some solid and air stable complexes of 4-amino-3-propyl-5-mercapto-S-triazine with VO2I, VO2II, VV and ZrOII have been prepared and characterized. They have also been tested for their antimicrobial activities.         
Key words : Complex compound, thioamide band, antimicrobial activity, magnetic moment etc.)                      

Electrical characterization of inorganic actfel Devices via spice
N.M. Qureshi, Virendra Kumar Gautam1, Sanjay Tiwari2 and R.C. Agrawal3
Abstract Inorganic ACTFEL (Alternating current thin film Electro-luminescence) devices are complex optoelectronic display devices. This paper presents the electrical characterization of space charge of ZnS:Mn  phosphor via both SPICE two sheet and SPICE Fowler-Nordheim diode. Simulation results show that  both models are capable of explaining the electrical characterization of the phosphor.          

Soil mapping a part of Datia Block, Datia District, Madhya Pradesh, India with reference remote sensing techniques
Satish Kumar Chakravarty and D.R. Tiwari*
Abstract: Soil is a very precious natural resources gifted to man by nature. Soil is a natural body developed by natural force acting on natural (Tambane, 1964). All forms of life derive their nutrition either directly from the soil or through other life supporting systems controlled by the soil. According to Gawande (1990)" Soil and land form a natural resource base which sustains most of the life forms. "Experts like Chatterjee et al. (1990) feel that soil is a component of land Karale et al.(1978). Singh and Das (1990), emphasized on soil for scientific planned development especially, watershed management, irrigation project planning etc.               

Study of structure of lightly crosslinked polypropylene crystallized from the melt under uniaxial compression
1B.B. Acharya,  2S. Mohanty and 3G. S. Roy
Abstract: When a cross linked sample is uniaxially compressed in the melt, the crystallization occurs and when cooled a unique orientation of crystallites takes place. These crystallites are randomly distributed about the normal to the film surface. This random distribution of crystallites are independent for all compression ratios and with the increase in compression ratio, the molecular chain axes in the crystallites orient more parallel to the film surface.        
Key words : Crosslinked, Uniaxial Compression, Wide anlge X-ray Diffraction.                 

Dielectric Constant for <100> tunneling model by applying the electric field in <100>, <110> & <111> crystallographic Directions
Raj Kumar* Mukesh Upadhyay, S.R. Shukla and D.N. Pandey
Abstract: In the present paper we have investigated theoretically the variation of dielectric constant with respect to temperature for <100> tunneling model by applying electric field in <100>. <110> & <111> directions with k=1.38´10–23 J/K, N=4´1025 m–3 & 4´1026 m–3 , m=3 Debye for temperature range from 10 K to 300 K which may be used to explains various experimentally available data and may be also used for further theoretical investigations.
Key words : Dielectric constant, Tunneling model, Potential barrier.                   

Cohesive energies in ammonium halides (NH4C1,NH4C11-x Br x)
Deepak Rawat, I.A. Khan  and  Sadhna singh*
Abstract: The Three body potential (TBP) model applied to explain the cohesive properties of (NH4C1,NH4C11-x Br x) and the associated volume collapse. The charge transfer effects, arising from the overlapping or deformation of the electron shells of the adjacent ions leading to the many body's interactions are included explicitly in the crystal potential. The present TBP calculations of cohesive energies are in good agreement with experimental data.               

The theoretical analysis of antenna gain for a ring micro-strip patch antenna
RAJ KUMAR TIWARI* and AMBIKESH TRIPATHI
Abstract: In the present communication we have investigated the expression of antenna gain for a ring micro-strip antenna and plotted gain vs frequency graph for X-band.  
Key words: Patch Radius, Effective aperture, Antenna Gain.