Three derivatives of phenacyldiphenylphosphine oxide: influence of aromatic and alkyl substituents on the luminescence sensitization of four Ln(NO3)3 salts

Georgia G Sands; Alyssa K Cook; Angelina Delabbio; Tim Fuhrer; Matthew D Bailey; Erin G Leach; Isabella R Purosky; Shannon M Biros

doi:10.1039/d3dt03556e

Three derivatives of phenacyldiphenylphosphine oxide: influence of aromatic and alkyl substituents on the luminescence sensitization of four Ln(NO₃)₃ salts

Dalton Trans. 2024 Feb 13;53(7):3118-3131. doi: 10.1039/d3dt03556e.

Authors

Georgia G Sands¹, Alyssa K Cook¹, Angelina Delabbio¹, Tim Fuhrer², Matthew D Bailey³, Erin G Leach¹, Isabella R Purosky¹, Shannon M Biros¹

Affiliations

¹ Department of Chemistry, Grand Valley State University, Allendale, MI 49401, USA. biross@gvsu.edu.
² Department of Chemistry, Radford University, Radford, VA 24142, USA.
³ Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.

PMID: 38236132
DOI: 10.1039/d3dt03556e

Abstract

A series of four β-carbonylphosphine oxide compounds have been synthesized, and their complexes with the nitrate salts of Sm³⁺, Eu³⁺, Tb³⁺ and Dy³⁺ have been characterized in solution and in the solid state. Analysis of the complexes using IR and NMR suggests that metal-ligand binding occurs mainly through the phosphine oxide group of the ligand, with some involvement of the carbonyl group. All 16 complexes luminesce in solutions of acetonitrile, albeit with varying degrees of intensity. The highest quantum yield values obtained for this series are those where the ligand contains an aryl carbonyl group paired with an electron rich phosphine oxide group (29.8 and 11% for the Tb³⁺ and Eu³⁺ complexes, respectively). In contrast, the longest emission lifetime values were found for complexes where the ligand contains a bulky substituent on the carbonyl group paired with an electron rich phosphine oxide (1.86, 1.402, 0.045 ms for the Tb³⁺, Eu³⁺ and Sm³⁺ complexes, respectively).