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Reference

Absorption and Raman spectra of Se8-ring clusters in zeolite 5A

Absorption and Raman spectra of Se8-ring clusters in zeolite 5A. Lin, Z.; Wang, Z.; Chen, W.; Lin, L.; Li, G.; Liu, Z.; Han, H.; Wang, Z. ( Lab. Semiconductor Materials Sciences, Inst. Semiconductors, Chinese Academy Sciences, Beijing 100083, Peop.There are some reagents like 12597-33-0 is used in this study. Rep. China). Solid State Communications, 100(12), 841-843 (English) 1996 Elsevier. CODEN: SSCOA4. ISSN: 0038-1098. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Samples with different wt. ratio of Se to zeolite 5A (Se compn.) were prepd. by loading Se into the cages of zeolite 5A and the measurements of the absorption and Raman spectra were carried out for the prepd. samples. The measured absorption edges of the samples are close and blue shifted to the value for monoclinic Se contg. Se8-ring, suggesting the formation of Se8-ring clusters in the cages. The continuous and broadening features of the absorption spectra are interpreted by the strong electron-phonon coupling in Se8-ring clusters. The sample with high Se compn. has a red shift of the absorption band edge relative to the samples with less Se compn. It is tentatively attributed to the reason that with different Se compn., single Se8-ring clusters and double Se8-ring clusters are formed in the cages of zeolite 5A. A single broad band at ~262 cm-1 is obsd. in the Raman spectra, that gives the further support of the formation of Se8-ring clusters. .

Correlation between reversed-phase retention and solute molecular surface type and area

Correlation between reversed-phase retention and solute molecular surface type and area. II. Retention of low polarity nonhydrocarbonaceous surfaces. Moeckel, H. J.; Hoefler, F.; Melzer, H. (Hahn-Meitner-Inst.Chemicals with cas numbers 107976-07-8 and 12597-33-0 also play role., Berlin G.m.b.H., Berlin D-1000/39, Fed. Rep. Ger.). J. Chromatogr., 388(2), 267-74 (English) 1987. CODEN: JOCRAM. ISSN: 0021-9673. DOCUMENT TYPE: Journal CA Section: 80 (Organic Analytical Chemistry) Section cross-reference(s): 22, 79 In octadecylsilica (ODS) systems with pure MeOH as eluent, the retention of homonuclear proton-free solutes such as P4, As4, S9, Se8, and sulfur homocycles Sn, with n > 9, appears to depend only on their resp. total mol. surface area (TSA). When plotted vs. TSA, their ln k' values lie on one straight line. The retention of these solutes is distinctly higher than that of n-alkanes having equal TSA. In terms of retention index, IK, the difference is about +500 units. It is proposed that the lower alkane retention is due to an addnl. interaction with the eluent MeOH. The retention increments produced by chalcogen atoms in RSnR, RSenR, and RTenR chains are also proportional to their resp. surface areas, and are influenced to a certain degree by the length of the terminal alkyl groups R. The retention of proton-free heteronuclear solutes such as SnSe8-n, hexachlorobenzene, hexabromobenzene and CS2 is lower than with homonuclear proton-free solutes, but higher than with alkanes if normalized to equal TSA. This is explained by the existence of stronger bond dipoles and an increased polarizability. .