AI Article Synopsis
- There are examples of lanthanide NIR-emitting materials that utilize different ligands or metal-ligand complexes as antennas to enhance emission properties.
- The study focuses on two series of [Zn-Ln] complexes that differ slightly in their chemical structure (ethoxy vs. methoxy substitution), which resulted in unexpected changes in their photophysical properties, particularly concerning the f-f transition.
- Detailed structural analyses using single-crystal X-ray diffraction and X-ray photoelectron spectroscopy showed important differences in crystal packing for the two complexes, while this structural variation did not impact their behavior in solution.
Article Abstract
There have been numerous instances of lanthanide NIR emitting material where one or more types of ligands or metal ion-ligand complexes operate as antennas. The antenna's role in NIR emission has also been thoroughly investigated and validated. The emission properties of the different antennae are predicted to differ. Here we describe the structural and photophysical properties of two series of [Zn-Ln] complexes, where a minor difference between the two series (ethoxy vs methoxy substitution) affected the photophysical properties, particularly the f-f transition, in an unprecedented manner. Both steady-state and time-resolved luminescence spectra were affected by this change. Detailed single-crystal X-ray diffraction (SCXRD) and X-ray photoelectron spectroscopy (XPS) studies of both complexes revealed the crucial structural differences in crystal packing, which astonishingly remains unaffected in solution.
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| http://dx.doi.org/10.1021/acs.jpcb.3c01674 | DOI Listing |
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