Cerium(iv) complexes with guanidinate ligands: intense colors and anomalous electronic structures.

ABSTRACT: A series of cerium(iv) mixed-ligand guanidinate-amide complexes, {[(Me₃Si)₂NC(N ⁱ Pr)₂] _x Ce^IV[N(SiMe₃)₂]_3-x }⁺ (x = 0-3), was prepared by chemical oxidation of the corresponding cerium(iii) complexes, where x = 1 and 2 represent novel complexes. The Ce(iv) complexes exhibited a range of intense colors, including red, black, cyan, and green. Notably, increasing the number of the guanidinate ligands from zero to three resulted in significant redshift of the absorption bands from 503 nm (2.48 eV) to 785 nm (1.58 eV) in THF. X-ray absorption near edge structure (XANES) spectra indicated increasing f occupancy (n _f) with more guanidi

SUBMITTER: Qiao Y 

PROVIDER: S-EPMC8179493 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature