RESUMEN

Guggul is a gum oleo-resin, tapped from a data deficient plant- Commiphora wightii (Arnott.) Bhandari in India. It is extensively used in ayurvedic drugs and formulations since ages. Natural plant-based products; especially aromatic ones like guggul gum oleo-resin deteriorates, qualitatively during its storage and transits before reaching the industry for its value addition. This economical and ecological loss can be avoided if it is stored in proper containers. Physico-chemical degradation of guggul samples stored were analysed by scanned electron microscopy, fourier transformed infra red, thermogravimatric, Powdered X-ray diffraction and elemental analysis for carbon, hydrogen, nitrogen and sulphur. Physico-chemical degradation of guggul oleo-resin occurs with the age of storage and the type of storage containers used. Among the four storage containers (earthen pot, plastic jar, polythene bag, jute bag) evaluated, earthen pot was found to be the best in checking the qualitative loss of guggul even upto 24 months. The qualitative information generated in the study on guggul storage may be useful to the drug industry and guggul traders. It may encourage them practice storing guggul in earthen pots against current practice of using jute bags and polythene bags, to store it.

RESUMEN

The title compound, C16H16FNO3, exists in a trans configuration with respect to the C=N bond [1.258 (2) Å]. The central meth-oxy O atom deviates from the plane of the attached benzene ring by 0.0911 (14) Å. The dihedral angle between the aromatic rings is 47.58 (11)°. The crystal structure features C-H⋯N and C-H⋯O inter-actions.

RESUMEN

The mol-ecules of the title compound, C16H18N2, exists in a trans conformation with respect to the C=N bond [1.270 (3) Å]. The least-squares plane of the di-methyl-amino group makes a dihedral angle of 1.3 (2)° with the ring to which it is attached. The dihedral angle between the two aromatic rings is 11.70 (2)°. The crystal structure features weak C-H⋯π inter-actions.

RESUMEN

In the title salt, C16H18NO(+)·C10H7O3S(-), the substituents attached to the central C=C bond adopt a trans conformation and the benzene and pyridinium rings are nearly coplanar, making a dihedral angle of 6.01 (9)°. The crystal structure features weak C-H⋯O hydrogen bonds and C-H⋯π inter-actions .

RESUMEN

The near infrared vibrational overtone absorption spectra of liquid phase toluidines are reported. The analysis of the observed CH and NH local mode mechanical frequency values shows that there exists steric and electronic interaction between the amino and methyl groups in o-toluidine. This observation supports the conclusions drawn from structural studies of toluidines by resonance two-photon ionization (R2PI) spectroscopy, ab initio calculations and laser induced fluorescence studies reported earlier.

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RESUMEN

The near infrared overtone absorption spectrum of liquid phase nitromethane in the spectral region deltaV = 2-5 is reported. The observed spectrum is analysed using local mode model. It is shown that the observed CH local mode overtones and local-local combinations are well predicted by a C(3V) coupled oscillator Hamiltonian.

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RESUMEN

In aniline, the lone pair electrons on the nitrogen atom in the amino group interact with the pi electrons of the ring and the mechanical frequency of the ring CH oscillator shows a red shift from that of benzene. This happens because of the parallel orientation of the pi electrons in the two molecules. This effect is observed in N-methylaniline also. But in N,N-dimethylaniline, the addition of two alkyl group to the amino group changes the parallel orientation of pi electrons of the nitrogen. This changes the electron donating nature of the amino substituent and as a result, a blue shift is observed in the mechanical frequency of the ring CH oscillator from that of benzene. The same effect is observed in the ring CH oscillator frequency of N,N-diethylaniline also.

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