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Yellow-Emitting, Pseudo-Octahedral Zinc Complexes of Benzannulated N^N^O Pincer-Type Ligands

Lozada, Issiah B.; Braun, Jason D.; Williams, J.A. Gareth; Herbert, David E.

Yellow-Emitting, Pseudo-Octahedral Zinc Complexes of Benzannulated N^N^O Pincer-Type Ligands Thumbnail


Authors

Issiah B. Lozada

Jason D. Braun

David E. Herbert



Abstract

A series of yellow-emitting, pseudo-octahedral Zn(II) complexes supported by monoanionic, tridentate acetylacetone-derived N^N–^O ligands incorporating phenanthridine (benzo[c]quinoline) units is presented. These species emit weakly in solution but exhibit extended millisecond luminescence lifetimes in the solid state at room temperature, and in a frozen glass at 77 K, indicative of phosphorescence from low-lying triplet excited states. Excitation spectra indicate a role for aggregation in enhancing emission in the solid state. In contrast to four-coordinate phenanthridinyl amide-supported tetradentate Zn(II) complexes which are nonemissive in fluid solution, solid-state X-ray crystallographic structures, solution IR spectroscopy, and computational analysis all indicate a delocalized character for the central deprotonated NH which tempers the amido character of the ligand. This design provides a mechanism for “turning on” long-lived luminescence from N-heterocycle/amido-supported Zn(II) coordination compounds.

Citation

Lozada, I. B., Braun, J. D., Williams, J. G., & Herbert, D. E. (2022). Yellow-Emitting, Pseudo-Octahedral Zinc Complexes of Benzannulated N^N^O Pincer-Type Ligands. Inorganic Chemistry, 61(44), 17568-17578. https://doi.org/10.1021/acs.inorgchem.2c02585

Journal Article Type Article
Acceptance Date Oct 12, 2022
Online Publication Date Oct 27, 2022
Publication Date Nov 7, 2022
Deposit Date Oct 31, 2022
Publicly Available Date Oct 28, 2023
Journal Inorganic Chemistry
Print ISSN 0020-1669
Electronic ISSN 1520-510X
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 61
Issue 44
Pages 17568-17578
DOI https://doi.org/10.1021/acs.inorgchem.2c02585
Public URL https://durham-repository.worktribe.com/output/1187516

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.inorgchem.2c02585







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