کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1411898 | 1501908 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vapor complexation in the ACl-CrCl3 (AÂ =Â Li, Cs) system up to 1400Â K and the tetrahedral ligand field states of chromium (III)
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Vapor complexation in the ACl-CrCl3 (AÂ =Â Li, Cs) system up to 1400Â K and the tetrahedral ligand field states of chromium (III) Vapor complexation in the ACl-CrCl3 (AÂ =Â Li, Cs) system up to 1400Â K and the tetrahedral ligand field states of chromium (III)](/preview/png/1411898.png)
چکیده انگلیسی
Electronic absorption spectroscopy is used in the temperature range 800-1400 K, to study the vapor species, over molten CrCl3-ACl (A = Li, Cs) mixtures and solid CrCl3. The observed Vis/near IR bands are assigned to d â d transitions of Cr3+ in distorted “tetrahedral” coordination (CrCl4-). Spectra of “octahedral” CrCl63- in molten alkali chlorides were also measured and used to estimate the spectroscopic constants (Dq, B, C) of Cr3+ in all chloride tetrahedral and octahedral environments. Composition and temperature-dependent measurements suggest that the predominant vapor species is the 1:1 monomer ACrCl4 and that an equilibrium is established:  ACrCl4 (g) â CrCl3 (g) + ACl (g)Due to vapor complexation the apparent vapor pressure of CrCl3 increases. The volatility enhancement is higher for the LiCl-CrCl3 than the CsCl-CrCl3 system reaching values near 60, at â¼950 K. Based on the preferential octahedral ligand field stabilization energy of Cr(III) it is argued that dimeric and/or trimeric 1:1 species may be also present as minor components in the vapor phase. Finally, the vapor complexation and volatility enhancement for the MX3-AX (M = rare earth, Cr; X = halide) systems are discussed and correlated to the melt structure of the corresponding binary melts.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 828, Issues 1â3, 28 February 2007, Pages 102-110
Journal: Journal of Molecular Structure - Volume 828, Issues 1â3, 28 February 2007, Pages 102-110
نویسندگان
G.N. Papatheodorou,