Three 18-Electron Tantalum(I) Compounds, TaCl(CO)2(dppe)2, [TaCl(CO)2(dppe)2]2x, and TaCl(CO)4(dppe) (dppe = 1,2-Bis(diphenylph
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- 作者：Mary Ann D. Koeslag ; Brian K. Hunter ; Joseph H. MacNeil ; Aleksander W. Roszak ; and Michael C. Baird
- 刊名：Inorganic Chemistry
- 出版年：1996
- 出版时间：November 20, 1996
- 年：1996
- 卷：35
- 期：24
- 页码：6937 - 6943
- 全文大小：169K
- 年卷期：v.35,no.24(November 20, 1996)
- ISSN：1520-510X
文摘
Reductive carbonylation of TaCl5 in the presence of1,2-bis(diphenylphosphino)ethane (dppe) under theappropriateconditions results in the formation ofTaCl(CO)2(dppe)2 (1), asthe major product, and the possibly cyclic oligomer[TaCl(CO)2(dppe)2]2x(2, 2x 
4) as a minor product.Carbonylation of 1 (1 atm) results in the rapid butreversibleformation of TaCl(CO)4(dppe) (3).Solutions of all three compounds exhibit low levels ofparamagnetism, possiblyattributable to thermal population of low-lying triplet excited states.Crystal data for the toluene solvate of 1,C68H64ClO2P4Ta:triclinic, P
(No. 2), a =13.937(12) Å, b = 14.811(7) Å, c= 14.929(9) Å, 
= 102.30(5)
,
= 95.60(7), 
= 98.41(5), Z =2.
4) as a minor product.Carbonylation of 1 (1 atm) results in the rapid butreversibleformation of TaCl(CO)4(dppe) (3).Solutions of all three compounds exhibit low levels ofparamagnetism, possiblyattributable to thermal population of low-lying triplet excited states.Crystal data for the toluene solvate of 1,C68H64ClO2P4Ta:triclinic, P (No. 2), a =13.937(12) Å, b = 14.811(7) Å, c= 14.929(9) Å, = 102.30(5), = 95.60(7), = 98.41(5), Z =2.