Solid-State NMR Structure Characterization of a 13CO-Labeled Ir(I) Complex with a P,N-Donor Ligand Including Ultrafast MAS Methods

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• 作者：Andrey A. Tregubov ; Rasmus Linser ; Khuong Q. Vuong ; Aditiya Rawal ; John D. Gehman ; Barbara A. Messerle
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：July 21, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：7146-7153
• 全文大小：428K
• ISSN：1520-510X

文摘

The structural characterization of a p>13p>CO-labeled Ir(I) complex bearing an P,N-donor ligand (1-[2-(diphenylphosphino)ethyl]pyrazole), [Ir(PyP)(p>13p>CO)Cl] is demonstrated using a series of tailored solid-state NMR techniques based on ultrafast (60 kHz) Magic Angle Spinning (MAS), which facilitates correlations with narrow proton line-widths. Our 1D p>1p>H MAS and 2D p>13p>C and p>31p>P CP-MAS NMR spectra provided structural information similar to that obtained using NMR spectroscopy in solution. We employed high-resolution 2D solid-state correlation spectroscopy (p>1p>H鈥?sup>13p>C HETCOR, p>1p>H鈥?sup>31p>P correlation) to characterize the networks of dipolar couplings between protons and carbon/phosphorus. p>1p>H鈥?sup>1p>H SQ鈥揝Q correlation spectra showed the dipolar contacts between all protons in a similar fashion to its solution counterpart, NOESY. The use of the p>1p>H single quantum/double quantum experiments made it possible to observe the dipolar-coupling contacts between immediately adjacent protons. Additionally, internuclear p>13p>CO鈥?sup>31p>P distance measurements were performed using REDOR. The combination of all of these techniques made it possible to obtain comprehensive structural information on the molecule [Ir(PyP)(p>13p>CO)Cl] in the solid state, which is in excellent agreement with the single crystal X-ray structure of the complex, and demonstrates the enormous value of ultrafast MAS NMR techniques for a broad range of future applications.