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Laser microprobe mass analysis (LAMMA) of pyridine adsorbed on some clay minerals from Turkey
No full textUsing laser microproble mass analysis (LAMMA), it is possible to characterize the inorganic composition of clays and to study adsorption phenomena. Natural sepiolite, (Na-sepiolite), montmorillonite and saponite samples from Anatolia (Turkey) have been investigated. All the clays gave different fingerprint mass spectra which allowed a quick estimation of the relative amounts of exchangeable cations as well as the trace contaminants and the homogeneity of their distribution. The adsorption behaviour of these clays for pyridine was also studied and it appeared that pyridine molecules penetrated the inner layers, as well as being adsorbed on the external surface
An Infrared and Raman Spectroscopic Study of Metal II Di 2 Methylpyridine Tetracyanonickelate Complexes
No full textThe results of an infrared and Raman spectroscopic study are reported for two new metal 2-methylpyridine tetracyanonickelate complexes, M(C6H7N)2Ni(CN)4, M=Ni or Cd. Their structure consists of corrugated polymeric layers of {M-Ni(CN)4}∞ with 2-methylpyridine molecules bound directly to the metal (M). These complexes can act as host lattices in the formation of inclusion compounds with dioxane guest molecules
Mutagenic efficiency of gamma irradiation in two soybean varieties
No full textEfficiency of gamma irradiation on certain characteristics such as seedling height and dry weight of Amsoy-71 and Calland soybean varieties has been measured considering to use this mutagen effectively in mutation breeding. A greenhouse experiment was conducted using different doses of gamma irradiation (0 to 70 krad) and two soybean varieties. All treatments were carried out in 5 replications and consisted of 50 seeds. Seeds were sown in pots and plants were grown under climatically controlled conditions. Seedling height measurements were made 14 days after the emergence when the first leaf has stopped its growth and dry weights were measured after 5 weeks of growth. ED50 (Effective Dose) values were also calculated in order to find out the suitable irradiation doses to be used in mutation induction for both varieties. The results showed clearly that seedling height and dry weight were affected by γ-irradiation and, as compared with the control, both of them were reduced as the dose was increased with some differences between the varieties. The soybean varieties also showed differences in terms of ED50 (Effective Dose) values and this value was found for Amsoy-71 as 16 krad, whereas for Calland as 20 krad. These results were in agreement with the literature values
Solid-state vibrational spectroscopy: Part 11. An infrared and raman vibrational spectroscopic study of metal(II) halide aniline complexes
No full textInfrared (4000−200 cm−1) and Raman (3500−50 cm−1) spectra are reported for metal(II) halide aniline complexes of the following stoichiometries: (MX2an2) (M Co, Ni or Hg, X Cl; M Mn, X Cl or Br; M Zn or Cd, X Cl, Br or I); (MX2an3) (M Mn, X Cl or Br; M Ni, X Cl); (CdCl2an) and an assignment is proposed for all the observed bands. Low-temperature (83 K) IR spectra are also reported and it is noted that whilst the aniline ring and CH mode values are virtually insensitive to temperature, the NH2 rocking and metal-ligand stretching mode values increase with decreasing temperature, whilst the NH2 stretching mode values decrease with decreasing temperature