کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1411639 1501868 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural and property characterization of two new charge-transfer salts based on Keggin ions and ferrocene
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Structural and property characterization of two new charge-transfer salts based on Keggin ions and ferrocene
چکیده انگلیسی

Two new charge-transfer salts based on ferrocene and Keggin-type anions, [NBu4]6 [Fe(C5H5)2][HAsMo12O40]2 (1) and [NBu4]2[Fe(C5H5)2]2[HSiMo12O40]·2CH3CN (2), were synthesized and their structures were determined by X-ray diffraction analysis. There are different stoichiometries (Keggin anion: ferrocene cation) in 1 and 2, namely, 2:1 and 1:2. There exist complex interactions between the polyanions, and the framework oxygens of anions and the cyclopentadienyl rings of ferrocene. One of two crystallographic asymmetric Keggin ions in 1 is surrounded by four parallel ferrocene cations with the closest distance of framework oxygens of anions and the cyclopentadienyl rings of ferrocene moiety of 3.16 Ǻ. Each anion in 2 is surrounded by six parallel ferrocene cations with the close distance of framework oxygens of anion and the cyclopentadienyl rings of ferrocene moiety from 3.197 to 3.401 Ǻ. The bond valence sum of Mo atoms in compounds 1 and 2 is in the range of 6.234–6.623 and much larger than 6, which suggests that there is more covalent ingredient between Mo–O in the change-transfer salts owing to the delocalization of one unpaired electron in the reduced Keggin ion. The UV–visible spectra, EPR and CV properties of the salts were also discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 920, Issues 1–3, 28 February 2009, Pages 436–440
نویسندگان
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