Synthesis and M枚ssbauer Spectroscopy of Formal Tin(II) Dichloride and Dihydride Species Supported by Lewis Acids and Bases

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• 作者：S. M. Ibrahim Al-Rafia ; Olena Shynkaruk ; Sean M. McDonald ; Sean K. Liew ; Michael J. Ferguson ; Robert McDonald ; Rolfe H. Herber ; Eric Rivard
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：May 6, 2013
• 年：2013
• 卷：52
• 期：9
• 页码：5581-5589
• 全文大小：428K
• 年卷期：v.52,no.9(May 6, 2013)
• ISSN：1520-510X

文摘

¹¹⁹Sn M枚ssbauer spectroscopy was performed on a series of formal Sn(II) dichloride and dihydride adducts bound by either carbon- or phosphorus-based electron pair donors. Upon binding electron-withdrawing metal pentacarbonyl units to the tin centers in LB路SnCl₂路M(CO)₅ (LB = Lewis base; M = Cr or W), a significant decrease in isomer shift (IS) was noted relative to the unbound Sn(II) complexes, LB路SnCl₂, consistent with removal of nonbonding s-electron density from tin upon forming Sn-M linkages (M = Cr and W). Interestingly, when the nature of the Lewis base in the series LB路SnCl₂路W(CO)₅ was altered, very little change in the IS values was noted, implying that the LB-Sn bonds were constructed with tin-based orbitals of large p-character (as supported by prior theoretical studies). In addition, variable temperature M枚ssbauer measurements were used to determine the mean displacement of the tin atoms in the solid state, a parameter that can be correlated with the degree of covalent bonding involving tin in these species.