Synthesis, FTIR, UV-Vis and Photoluminescence characterizations of triethanolamine passivated CdO nanostructures

In this study, triethanolamine (TEOA) capped CdO nanostructures had been synthesized by wet chemical method annealed at 648K were reported. The structural, morphological and optical properties of the samples were studied by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM) with energy dispersive spectra (EDS) analysis, Fourier transform infrared (FTIR) spectroscopy, UV-Vis spectroscopy and Photoluminescence (PL) techniques. The XRD spectrum showed that all the samples were cubic in structure. The presence of functional groups and chemical bonding had been confirmed by FTIR. UV-Vis measurements showed decreased band gap energy for TEOA capped CdO, when compared with uncapped CdO. The PL spectra of the CdO systems showed the red emission.

Structural, spectral, thermodynamical, NLO, HOMO, LUMO and NBO analysis of fluconazole

Fluconazole is an efficient antifungal drug used in the treatment and prevention of superficial and systemic fungal infections. The molecular structure, fundamental vibrational wavenumber and intensity of the vibrational bands are interpreted, aided by density functional theory method. The results of the calculations were applied to simulated spectra of the title compound, which show excellent agreement with observed spectra. The vibrational analysis of the title compound has been carried out using FT-IR and FT-Raman spectra. Stability of the molecule arising from hyperconjugative interactions and charge delocalization has been analyzed using natural bond orbital analysis. The present investigation is extended to calculate the HOMO-LUMO energy gap, polarizability, Mulliken charges and thermodynamical properties of fluconazole at different temperature. The calculated HOMO-LUMO energy gap shows that the charge transfer occurs within the molecule. The frontier orbital and molecular electrostatic potential surface studies have been employed to understand the active sites of fluconazole. Nonlinear optical properties related to polarizability and hyperpolarizability are also discussed. The absorption characteristics and solvent analysis of fluconazole have been made using UV-Vis spectroscopic method.

Investigation of silicate mineral sanidine by vibrational and NMR spectroscopic methods

Sanidine, a variety of feldspar minerals has been investigated through optical absorption, vibrational (IR and Raman), EPR and NMR spectroscopic techniques. The principal reflections occurring at the d-spacings, 3.2892, 3.2431, 2.9022 and 2.6041 A confirm the presence of sanidine structure in the mineral. Sanidine shows five prominent characteristic infrared absorption bands in the region 1200-950, 770-720, 590-540 and 650-640 cm(-1). The Raman spectrum shows the strongest band at 512 cm(-1) characteristic of the feldspar structure, which contains four membered rings of tetrahedra. The UV-vis-NIR absorption spectrum had strong absorption features at 6757, 5780 and 5181 cm(-1) due to the combination of fundamental OH- stretching. The bands at 11236 and 8196 cm(-1)and the strong, well-defined band at (30303 cm(-1) attest the presence of Fe(2+) and Fe(3+), respectively, in the sample. The signals at g = 4.3 and 3.7 are interpreted in terms of Fe(3+) at two distinct tetrahedral positions Tl and T2 of the monoclinic crystal structure The (29)Si NMR spectrum shows two peaks at -97 and -101 ppm corresponding to T2 and T1, respectively, and one peak in (27)Al NMR for Al(IV).

Vibrational spectra and normal coordinate analysis of diazepam, phenytoin and phenobarbitone

Vibrational spectroscopy is an important tool for the structural investigation of the organic molecules. In the present investigation, a normal coordinate analysis has been carried out on some anti-epileptic drugs, viz. diazepam, phenytoin and phenobarbitone. Diazepam is a derivative of benzodiazepine, phenytoin is a derivative of hydanation and pheonobarbitone is a barbiturate. The infrared spectra of the compounds are recorded in the region 4000-400 cm(-1) and Raman spectra are recorded in the region 3500-50 cm(-1). From the structural point of view, diazepam, phenytoin and phenobarbitone have been assumed to C(s) point group. A systematic set of symmetry coordinates has been constructed for these compounds and Wilson's FG matrix method has been applied for the normal coordinate analysis using general quadratic valance force field. The potential energy distribution is also calculated to check the vibrational band assignments.

Genetic analysis of familial myelodysplastic syndrome: absence of linkage to chromosomes 5q31 and 7q22

Myelodysplastic syndrome (MDS) is a hematological disorder that occurs primarily in the elderly as an acquired, sporadic disease. Familial cases of MDS are rare. We have identified a kindred with three affected individuals, with early age of onset, suggesting a possible inherited predisposition to this disease. Using a molecular genetic approach, we examined whether bands 5q31 or 7q22 or both, the chromosomal regions most frequently associated with sporadic MDS, are involved in familial expression of MDS in this pedigree. Linkage analysis using polymorphic microsatellite DNA markers demonstrated that neither 5q31 nor 7q22 cosegregated with MDS in this family. There was no history of common environmental or occupational exposure among family members with MDS. In addition, analysis of polymorphisms at two loci [glutathione S-transferase T1 and M1 (GSTT1 and GSTM1)] involved in carcinogen detoxification and associated with cancer susceptibility, including increased risk for MDS, showed no evidence for enhanced sensitivity to environmental carcinogens in affected family members. Taken together, our findings suggest that (1) there is an inherited predisposition to MDS in this kindred; and (2) genes at 5q31 and 7q22, the regions most commonly associated with sporadic MDS, are excluded from a causal role in this family's disease.