Issue 10, 2021

Diversifying the luminescence of phenanthro-diimine ligands in zinc complexes

Abstract

Strongly blue fluorescent 1-phenyl-2-(pyridin-2-yl)-1H-phenanthro[9,10-d]imidazole (L1) is a facile block for the construction of multichromophore organic molecules, and simultaneously serves as a chelating diimine ligand. The coordination of L1 to zinc halides enhances the intraligand charge transfer and decreases the emission energy. For the iodide derivative, intra- and intermolecular heavy atom effects lead to a dual singlet–triplet emission with a temperature-dependent ratio of fluorescence and phosphorescence bands in the crystalline state. Decoration of the anthracene core with pyridyl-phenanthroimidazole units (L2 and L3) changes the localization of the lowest energy electronic transitions to the former polyaromatic motif. The solid-state photophysical characteristics of L2 and L3-based compounds strongly depend on the intermolecular interactions between the constituting π-systems (phenanthrene and anthracene), which are perturbed by the ZnX2 coordinated fragments. Modulation of π-stacking contacts in these molecular materials containing L2 and L3 chromophores forms a basis for dynamic optical properties, responsive to mechanical, thermal, or chemical stimuli.

Graphical abstract: Diversifying the luminescence of phenanthro-diimine ligands in zinc complexes

Supplementary files

Article information

Article type
Research Article
Submitted
02 feb 2021
Accepted
12 mrt 2021
First published
07 apr 2021
This article is Open Access
Creative Commons BY-NC license

Inorg. Chem. Front., 2021,8, 2549-2560

Diversifying the luminescence of phenanthro-diimine ligands in zinc complexes

D. Temerova, K. S. Kisel, T. Eskelinen, A. S. Melnikov, N. Kinnunen, P. Hirva, J. R. Shakirova, S. P. Tunik, E. V. Grachova and I. O. Koshevoy, Inorg. Chem. Front., 2021, 8, 2549 DOI: 10.1039/D1QI00149C

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