Synthesis and characterization of poly(pyrazolyl)borate tantalum amide complexes and their reactivities toward oxygen |
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| Authors: | ShuJian Chen Glenn P A Yap ZiLing Xue |
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| Institution: | CHEN ShuJian1,Glenn P. A. YAP2 & XUE ZiLing1 1 Department of Chemistry,The University of Tennessee,Knoxville,TN 37996-1600,USA,2 Department of Chemistry & Biochemistry,The University of Delaware,Newark,Delaware 19716 |
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| Abstract: | Reaction of TaCl(NMe2)4 (1) with KTp* Tp* = tris(3,5-dimethylpyrazolyl)borohydride] yields two products: Tp*Ta(NMe2)4 (2), in which one N atom of the Tp* ligand binds to Ta, and Tp*Ta(NMe2)4]·2KTp* (3) where three N atoms of the Tp* ligand in Tp*Ta(NMe2)4] (2a) bind to Ta. Addition of excess 1 to 3 did not exclude KTp*. Further reaction of 2 with oxygen affords Tp*BH(NMe2) (4). TpTa(NMe2)4 (5) has been synthesized by a similar procedure through the reaction of 1 with TpK Tp = tris(pyrazolyl)borohydride]. Reactions
of 3 and 5 with oxygen were also studied. 2, 4, and 5 were characterized by NMR, EA, and single-crystal X-ray diffraction. |
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| Keywords: | polypyrazolyborate tantalum amide oxygen |
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