4-Tetrafluoropyridyl Silver(I), AgC5F4N, in Redox Transmetalations with Selenium and Tellurium

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• 作者：Said Aboulkacem ; Dieter Naumann ; Wieland Tyrra ; Ingo Pantenburg
• 刊名：Organometallics
• 出版年：2012
• 出版时间：February 27, 2012
• 年：2012
• 卷：31
• 期：4
• 页码：1559-1565
• 全文大小：352K
• 年卷期：v.31,no.4(February 27, 2012)
• ISSN：1520-6041

文摘

Se(C₅F₄N)₂ and Te(C₅F₄N)₂ were prepared via redox transmetalations of AgC₅F₄N and the corresponding elements in good yields. The crystal structures of both derivatives exhibit infinite chains caused by a weak intermolecular contact between the chalcogen and one nitrogen atom with a T-shaped (蠄-pentagonal-bipyramidal) ligand arrangement. Crystallization of both reagents from dimethylsulfoxide gave single crystals of the corresponding 1:1 adducts that crystallize in infinite chains best expressed by the formula [E(C₅F₄N)₂路(渭-DMSO)]_{鈭?/sub> (E = Se, Te). In these cases, the coordination spheres of selenium and tellurium are square-planar (蠄-octahedral). Similar effects are found in the molecular structures of [Te(C5F4N)2路TMTU]鈭?/sub> and [Te(C6F5)2路TMTU]鈭?/sub> (TMTU = tetramethylthiourea). Differences in the Te鈥揝 interatomic distances clearly indicate the C5F4N ligand being significantly more electron-withdrawing in comparison with the C6F5 group; that is, Te(C5F4N)2 is the stronger Lewis acid.}