التفاصيل البيبلوغرافية
| العنوان: |
Synthesis, Structural Characterization, and Magnetic Properties of a New Charge-Transfer Salt Composed of Polyoxotungstate Acceptors [WVWVI5O19]3- and Cationic Ferrocenyl CpFe+Cp Donors. |
| المؤلفون: |
Wen-Bin Yang, Can-Zhong Lu, Chuan-De Wu, Ya-Qin Yu, Quan-Zheng Zhang, Shu-Mei Chen |
| المصدر: |
Journal of Cluster Science; Sep2003, Vol. 14 Issue 3, p421-430, 10p |
| مصطلحات موضوعية: |
CRYSTALS, CHARGE transfer, ELECTRONS, SALT, OPTICAL diffraction, SPACE groups |
| مستخلص: |
The crystal structure of the charge-transfer slat (CpFe+Cp)3[WVW5VIO19] (CpFeCp=Fe(C5H5)2), synthesized from the reaction of Na2WO4·2H2O with ferrocene under acid conditions, has been determined by single-crystal X-ray diffraction. The crystal is of triclinic space group P(-1) with a = 13.0374(3), b = 15.0406(3), c = 16.8239(1) Å, α = 91.417(1), β = 98.931(1), γ = 115.294(1)°, V = 2931.20(9) ų, Z = 1, Mr = 5895.57, F(000) = 2652, µ = 18.735 mm-1, and Dc = 3.340 g·cm-3. The final R factor is 0.0502 for 10173 (Rint = 0.0563) unique reflections and 770 parameters. The structural analysis reveals that there are two crystallographically distinct [WVW5VIO19]3- polyoxoanions and six independent ferrocene cations per unit cell. Each polyoxoanion consists of six WO6 octahedra with three types of W-O bond lengths. Interestingly, CpFe+Cp moieties are stacked to form octagonal channels that incorporate the polyanions. The closest Fe···Fe distances between the neighboring ferrocenyl cations are more than 6.49 Å, therefore, a good magnetic isolation between the iron centers is expected. KEY WORDS: Polyoxotungstate; charge-transfer salt; crystal structure; magnetic properties. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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