Coordination chemistry of N-heterocyclic stannylenes: a combined synthetic and Mössbauer spectroscopy study.

Coordination chemistry of N-heterocyclic stannylenes: a combined synthetic and Mössbauer spectroscopy study.
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N-杂环锡烯的配位化学:综合合成和穆斯堡尔光谱研究。

DOI:
10.1021/ic101920x
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发表时间:
2011
影响因子:
4.6
通讯作者:
D. Wass
D. Wass
中科院分区:
化学2区
文献类型:
--
作者:
S. M. Mansell;R. Herber;I. Nowik;Douglas H Ross;C. A. Russell;D. Wass

文献摘要

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N-杂环亚锡烷基(NHSns),[(Dipp)N(CH(2))(n)N(Dipp)Sn](Dipp = 2,6-(i)Pr(2)C(6)H(3); n = 2,1; n = 3,5)和[((t)Bu)N(CHMe)(2)N((t)Bu)Sn](10)是与多种过渡金属中心配位的配体,如配合物[W(CO)(5)·1](2)所示,[(OC)(4)Fe(μ-1)(2)Fe(CO)(4)](3)、[(OC)(4)Fe(μ-1)Fe(CO)(4)](4)、[Fe(CO)(4)·5](n)(6,n = 1或2)、[(OC)(4)Fe(μ-5)Fe(CO)(4)](7)、[Ph(3)PPt(μ-1)(2)PtPPh(3)](8)、[Fe(CO)(4)·10](11)和[(η(5)-C(5)H(5))(OC)(2)Mn·10](12)。X射线晶体学研究表明,NHSns在结构上基本上不受干扰地与金属结合,但与母体NHC相反,NHSns通常采用跨双核金属单元的桥接位置。亚甲锡烷基的末端和桥接位置之间的平衡显然是紧密平衡的,如在固态和溶液中观察到的6的单体和二聚体所示。配合物的(119)Sn和(57)Fe穆斯堡尔谱表明,配合物中的锡原子与缺电子Sn(II)中心一致。
The N-heterocyclic stannylenes (NHSns), [(Dipp) N(CH(2))(n)N(Dipp)S n] (Dipp = 2,6- (i)Pr(2)C(6)H(3); n = 2, 1; n = 3, 5) and [((t)Bu) N(CHMe)(2)N((t)Bu)S n] (10) are competent ligands toward a variety of transition metal centers, as seen in the complexes [W(CO)(5)·1] (2), [(OC)(4)Fe(μ-1)(2)Fe(CO)(4)] (3), [(OC)(4)Fe(μ-1)Fe(CO)(4)] (4), [Fe(CO)(4)·5](n) (6, n = 1 or 2), [(OC)(4)Fe(μ-5)Fe(CO)(4)] (7), [Ph(3)PPt(μ-1)(2)PtPPh(3)] (8), [Fe(CO)(4)·10] (11), and [(η(5)-C(5)H(5))(OC)(2)Mn·10] (12). X-ray crystallographic studies show that the NHSns are structurally largely unperturbed binding to the metal, but in contrast to the parent NHCs, NHSns often adopt a bridging position across dinuclear metal units. The balance between terminal and bridging positions for the stannylene is evidently closely balanced as shown by the observation of both monomers and dimers for 6 in the solid state and in solution. (119)Sn and (57)Fe Mössbauer spectroscopy of the complexes shows the tin atoms in such complexes to be consistent with electron deficient Sn(II) centers.