Tellurium as a bridging ligand in cluster synthesis

Mathur, Pradeep and Mavunkal, Ipe J and Thimmappa, B H S and Rugmini, V and Shastri, B B S (1990) Tellurium as a bridging ligand in cluster synthesis. Proceedings Indian Academyof Science, 102 (3). pp. 395-402.

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The compounds Fe2(CO)6(p2-Te2) and F%(CO)9(#~-Te)2 have served as useful starting materials for the synthesis of several new tellurium bridged complexes. Addition across the Te-Te bond occurs readily. For instance, the room temperature reaction of Fe2(CO)6(p2-Te2) with Ru(CO)4(C2H4) leads to an immediate and almost quantitative formation of the novel mixed-metal cluster Fe2Ru(CO)9(/~a-Te)2. The formation of this cluster most likely proceeds via the initial formation of an Fe-Ru bond to give Fe2Ru(CO)9(P3-Te)2. On treatment of the mixed-metal cluster with NaOMe and acidification of the solution, Fe2(CO)6(/.t2-Te2) is obtained, suggesting that during the formation of Fe2Ru(CO)9(P3-Te)2 from Fe2(CO)6(/.t2-Te2), the Fe-Fe bond is retained intact. Also, Fe2Ru(CO)9(u3-Te)2 reacts at room temperature with Pt(PPh3), to give (CO)6Fe2(ju3-Te)2Pt(PPh3)2. Reflux of a benzene solution of Fe2(CO)9(~%-Te)2 within Ru3(COh 2 forms the novel cluster Ru4(CO)Io(/~-CO)(~4-Te)2. This electron-deficient cluster reacts with various phosphines to give substituted derivatives. With PPh3, the tris(triphenylphosphine) derivative Ru3(CO)6(PPha)a(/~3-Te)2 is also obtained at room temperature.

Item Type: Article
Uncontrolled Keywords: Bridging ligand; cluster synthesis; tellurium bridged complexes
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 25 Aug 2016 09:40
Last Modified: 25 Aug 2016 09:40

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