Work

Luminescent Carbazole-Based Eu III and Yb III Complexes with a High Two-Photon Absorption Cross-Section Enable Viscosity Sensing in the Visible and Near IR with One- and Two-Photon Excitation

Year: 2020

Type: article

Abstract: The newly synthesized Eu III and Yb III complexes with the new carbazole-based ligands CPAD 2– and CPAP 4– display the characteristic long-lived metal-centered emission upon one- and two-photon excitation. The Eu III complexes show the expected narrow emission bands in the red region, with emission lifetimes between 0.382 and 1.464 ms and quantum yields between 2.7% and 35.8%, while the Yb III complexes show the expected emission in the NIR region, with emission lifetimes between 0.52 and 37.86 μs and quantum yields between 0.028% and 1.12%. Two-photon absorption cross sections (σ 2PA ) as high as 857 GM were measured for the two ligands. The complexes showed a strong dependence of the one- and two-photon sensitized emission intensity on solvent viscosity in the range of 0.5–200 cP in the visible and NIR region.

Source: Inorganic Chemistry

DOI: 10.1021/acs.inorgchem.9b03561

Authors: Jorge H. S. K. Monteiro, Natalie R. Fetto, Matthew J. Tucker, Ana de Bettencourt-Dias

Institution: University of Nevada, Reno

Language: English

Topic: Lanthanide and Transition Metal Complexes

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Institute of General Medical Sciences, Division of Chemistry

Awards: Developing Infrared 'FRET' Analogs to Capture Molecular Snapshots through Non-equilibrium 2D IR Spectroscopy of Recognition and Self-Assembly in Biologically Relevant Systems, G1836437976, G2187314184