Surface Functionalization of Black Phosphorus with Nitrenes: Identification of P=N Bonds Using Isotopic Labeling

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Walz Mitra, Kendahl
Chang, Christine
Hanrahan, Michael
Yang, Jiaying
Tofan, Daniel
Holden, William
Govind, Niranjan
Seidler, Gerald
Velian, Alexandra
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Rossini, Aaron
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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The Department of Chemistry was founded in 1880.

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Surface functionalization of two‐dimensional crystals is a key path to tuning their intrinsic physical and chemical properties. However, synthetic protocols and experimental strategies to directly probe chemical bonding in modified surfaces are scarce. Introduced here is a mild, surface‐specific protocol for the surface functionalization of few‐layer black phosphorus nanosheets using a family of photolytically generated nitrenes (RN) from the corresponding azides. By embedding spectroscopic tags in the organic backbone, a multitude of characterization techniques are employed to investigate in detail the chemical structure of the modified nanosheets, including vibrational, X‐ray photoelectron, solid state 31 P NMR, and UV‐vis spectroscopy . To directly probe the functional groups introduced on the surface, R fragments were selected such that in conjunction with vibrational spectroscopy, 15 N‐labeling experiments, and DFT methods, diagnostic P=N vibrational modes indicative of iminophosphorane units on the nanosheet surface could be conclusively identified.


This is the peer-reviewed version of the following article: Walz Mitra, Kendahl, Christine H. Chang, Michael P. Hanrahan, Jiaying Yang, Daniel Tofan, William M. Holden, Niranjan Govind, Gerald Seidler, Aaron J. Rossini, and Alexandra Velian. "Surface Functionalization of Black Phosphorus with Nitrenes: Identification of P= N Bonds Using Isotopic Labeling." Angewandte Chemie International Edition (2020), which has been published in final form at DOI: 10.1002/anie.202016033. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Posted with permission.

Wed Jan 01 00:00:00 UTC 2020