Core-Hole Excitation Spectra of the Oxides and Hydrates of Fullerene C and Azafullerene CN
Affiliations
The interaction of fullerenes and their derivatives with environmental molecules such as oxygen or water was crucial for the rational design of low-dimensional materials and devices. In this paper, the near-edge X-ray absorption fine structure (NEXAFS), X-ray emission spectroscopy (XES) and X-ray photoelectron spectroscopy (XPS) shake-up satellites were employed to distinguish the oxides and hydrates of the fullerene C and azafullerene CN families. The study includes various isomers, such as the open [5,6] and closed [6,6] isomers of CO, CH(OH), C-O-C, CH-O-CH, CN(OH) and CN-O-CN, based on density functional theory. These soft X-ray spectra offered comprehensive insights into the molecular orbitals of these azafullerene molecular groups. The oxygen -edge NEXAFS, carbon and oxygen -edge XPS shake-up satellite spectra provided valuable tools for distinguishing oxides or hydrates of fullerene C and azafullerene CN. Our findings could significantly benefit the development of fullerene functional molecular materials and expand the application scope of soft X-ray spectroscopy as a molecular fingerprinting tool for the fullerene family.