Direct Characterization of Metal鈥揗etal Bonds between Nuclei with Strong Quadrupolar Interactions via NMR Spectroscopy
详细信息 查看全文
- 作者：Fr茅d茅ric A. Perras ; David L. Bryce
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2014
- 出版时间：November 20, 2014
- 年：2014
- 卷：5
- 期：22
- 页码：4049-4054
- 全文大小：306K
- ISSN：1948-7185
文摘
Metal鈥搈etal bonds can be difficult to characterize directly. We demonstrate that J couplings between metal nuclei experiencing strong quadrupolar interactions can be easily measured from well-defined splittings in NMR spectra of powdered samples. Using 69/71Ga NMR, it is shown that homonuclear J coupling, which is four orders of magnitude smaller than the quadrupolar coupling in a series of compounds featuring gallium鈥揼allium bonds, can be extracted with a 2-D NMR experiment. The dependence of the multiplets on crystal symmetry reveals information on the structures of two Ga鈥揋a-bonded compounds for which diffraction data are unavailable. Interpretation of the data in a molecular orbital framework provides insight into the nature of the metal鈥搈etal bond.