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

Date
2020-12-18
Authors
Walz Mitra, Kendahl
Chang, Christine
Hanrahan, Michael
Yang, Jiaying
Tofan, Daniel
Holden, William
Govind, Niranjan
Seidler, Gerald
Rossini, Aaron
Velian, Alexandra
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Ames Laboratory
Organizational Unit
Chemistry
Organizational Unit
Journal Issue
Series
Abstract

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.

Description

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.

Keywords
Black phosphorus, surface modification, 15N isotopic labeling, ambient stability, nitrene functionalization
Citation
DOI
Collections