Synthesis of Trinuclear, Dinuclear and Mononuclear Carbamato-Zinc Complexes from Tetranuclear Precursors: A Top-Down Synthetic Approach to New Carbamates
✍ Scribed by Dan Domide; Christiane Neuhäuser; Elisabeth Kaifer; Hubert Wadepohl; Hans-Jörg Himmel
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 651 KB
- Volume
- 2009
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
In this work we report on the synthesis of new mono‐, bi‐ and trinuclear carbamato‐Zn complexes by reaction of the tetranuclear precursor [ZnEt(O~2~CNR~2~)]~4~ (R = __i__Pr and __i__Bu) with the nitrogen bases pyridine, N,N,N′,N′‐tetramethylguanidine (tmg) and bis(N,N,N′,N′‐tetramethylguanidino)naphthalene (btmgn). The only reaction product obtained with pyridine is the dinuclear complex [(py)ZnEt(O~2~CNR~2~)]~2~. In the case of reaction of [ZnEt(O~2~CNR~2~)]~4~ with tmg, the dinuclear species [(tmg)ZnEt(O~2~CNR~2~)]~2~ (for molar ratios of 1:4) and the mononuclear bis‐carbamato complex [(tmg)~2~Zn(O~2~CNR~2~)~2~] (for molar ratios of 1:8) were obtained. Finally, the mono‐ and trinuclear carbamates [(btmgn)ZnEt(O~2~CNR~2~)] and [(btmgn)Zn~3~Et~3~(O~2~CNR~2~)~3~] were formed in the reaction between [ZnEt(O~2~CNR~2~)]~4~ and btmgn (molar ratios 1:4 and 1:2, respectively). All products were structurally characterized by X‐ray diffraction. Using this top‐down approach the synthesis of a variety of oligonuclear carbamato‐Zn complexes becomes possible. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)