Showing papers on "Selenourea published in 1971"
TL;DR: In this article, a normal co-ordinate analysis of the planar vibrations of thiourea has been carried out, with reference to the results obtained for urea using 18O and 15N frequency shift data in addition to 1H and 2H frequency data.
Abstract: A normal co-ordinate analysis of the planar vibrations of thiourea has been carried out, with reference to the results obtained for urea using 18O and 15N frequency shift data in addition to 1H and 2H frequency data. The 21-parameter force field obtained is very similar to that for urea, or follows predictable trends for the co-ordinates involving the CS bond. The resulting normal co-ordinates are considered to be reliably determined, and are given in terms of the potential energy distribution in Table 3. By extending the calculations to [1H4]- and [2H4]-selenourea, an assignment of the planar vibrations is made. It seems that the vibration band at 735 cm–1 is due to an out-of-plane vibration and does not belong to the A1 species, as has been suggested by analogy with the almost coincident vibration band in thiourea. Our calculations favour assignment of the A1 species vibration to the band at 640 cm–1. This assignment is supported by the Raman spectrum of [1H4]selenourea.
35 citations
TL;DR: In this paper, a nucleophilic displacement of the chloro group from 2-amino-6-chloro-9-(β-D-ribofuranosyl)purine with either selenourea or sodium hydrogen selenide was shown to be easier under these conditions than the corresponding mercapto group.
15 citations
TL;DR: The anoxic sensitization appears to be due to colloidal selenium which is formed by radiation from selenourea, whereas this last seems to be a protector most active in the presence of oxygen.
Abstract: SummaryE. coli B/r irradiated in the presence of 5 × 10−2 M selenourea shows an increased survival when irradiated in air and the opposite effect in nitrogen.The anoxic sensitization appears to be due to colloidal selenium which is formed by radiation from selenourea, whereas this last seems to be a protector most active in the presence of oxygen. This statement is based on the following experimental results:1. 5 × 10−2 M selenourea solutions show the same effect when pre-irradiated with 150 krads before mixing with bacterial suspensions;2. colloidal selenium separated from a repeatedly-irradiated selenourea solution and resuspended in buffer is more active than the original selenourea solution in sensitizing anoxic bacteria and is completely ineffective on bacteria irradiated in air;3. the sensitization of anoxic bacteria is decreased by resuspending colloidal selenium in fresh selenourea solution.
10 citations
6 citations
TL;DR: In this article, 6-chloropurine 3-oxide with several amines led to 6-substituted purine 3oxides, including 6-methylthiopurine, which by treatment with chlorine was oxidized to 6methyl-sulfonylpurine 3oxide.
4 citations
Patent•
12 Jan 1971
TL;DR: In this article, the authors describe a color development process for a color SILVER HALIDE PHOTOGRAPHIC MATERIAL using a BLEACH-FIX ACCELERATOR.
Abstract: THIS APPLICATION DESCRIBES A COLOUR DEVELOPMENT PROCESS FOR COLOUR SILVER HALIDE PHOTOGRAPHIC MATERIAL, WHEREIN THE MATERIAL AFTER DEVELOPMENT IS TREATED WITH A BLEACHFIX SOLUTION WHICH CONTAINS A MILD OXIDISING AGENT, A SILVER HALIDE SOLVENT AND AS A BLEACH-FIX ACCELERATOR A WATERSOLUBLE COMPLEX CONSISTING OF A SPECIFIED METAL AND SELENOUREA A SPECIFIED N-ALKYL SUBSTITUTED SELENOUREA OR A SPECIFIED SELENOSEMICARBAZIDE.
2 citations
TL;DR: Some new compounds of selenourea with Sn(II), Sn(IV), Pb(II) and Bi(III) were obtained, which had the composition: SnCl2·2Seu, SnCl4·4Seu as mentioned in this paper.
Abstract: Some new compounds of selenourea with Sn(II), Sn(IV), Pb(II) and Bi(III) were obtained, which had the composition: SnCl2·2Seu, SnCl4·4Seu, PbCl2·2Seu, 2Pb(NO3)2·11Seu and Bi(NO3)3·6Seu.
2 citations
TL;DR: In this article, the IR spectra of the free selenourea and the obtained complexes of Co(II) and Ni(II), were compared and it was shown that the Seu is coordinated through the selenium atom.
Abstract: 1.
Compounds of selenourea (Seu) having the composition: Co(NO3)2·4Seu, Ni(NO3)2·4Seu, Ni(NO3)2·4Seu·4C3H6O, were synthesized and isolated in the pure state.
2.
By comparing the IR spectra of the free selenourea and the obtained complexes of Co(II) and Ni(II) it was shown that the Seu is coordinated through the selenium atom.
1 citations
TL;DR: In this paper, the decomposition temperatures of the obtained compounds were determined and it was shown that the thermal decomposition goes by a complex mechanism, which is the same mechanism used in the analysis of selenourea compounds.
Abstract: 1.
Compounds of selenourea with Tl(I) having the composition: TlCl·4Seu, TlClO4·4Seu, TlCH3COO·4Seu, TlBr·4Seu, TlCNS·3Seu, TlNO3·3Seu, Tl2SO4·6Seu, were isolated in the pure state.
2.
The decomposition temperatures of the obtained compounds were determined and it was shown that the thermal decomposition goes by a complex mechanism.
TL;DR: In this article, the coordination of selenourea with silver through the selenium atom was detected by the method of IR spectroscopy, and the thermal stability of the complexes increases with increasing number of SeU groups in the compound.
Abstract: 1.
Compounds of selenourea (SeU) with silver nitrate with the composition: Ag(NO3) · SeU, Ag(NO3) · 2SeU, and Ag(NO3) · 3SeU were synthesized and isolated in the individual states.
2.
The coordination of selenourea with silver through the selenium atom was detected by the method of IR spectroscopy.
3.
The thermal stability of the complexes increases with increasing number of selenourea groups in the compound.