Issue 21, 2024

Aggregation-induced enhanced fluorescence emission of chiral Zn(ii) complexes coordinated by Schiff-base type binaphthyl ligands

Abstract

A pair of novel chiral Zn(II) complexes coordinated by Schiff-base type ligands derived from BINOL (1,1′-bi-2-naphthol), R-/S-Zn, were synthesized. X-ray crystallography revealed the presence of two crystallographically independent complexes; one has a distorted trigonal–bipyramidal structure coordinated by two binaphthyl ligands and one disordered methanol molecule (molecule A), while the other has a distorted tetrahedral structure coordinated by two binaphthyl ligands (molecule B). Numerous CH⋯π and CH⋯O interactions were identified, contributing to the formation of a 3-dimensional rigid network structure. Both R-/S-Zn exhibited fluorescence in both CH2Cl2 solutions and powder samples, with the photoluminescence quantum yields (PLQYs) of powder samples being twice as large as those in solutions, indicating aggregation-induced enhanced emission (AIEE). The AIEE properties were attributed to the restraint of the molecular motion arising from the 3-dimensional intermolecular interactions. CD and CPL spectra were observed for R-/S-Zn in both solutions and powders. The dissymmetry factors, gabs and gCPL values, were within the order of 10−3 to 10−4 magnitudes, comparable to those reported for chiral Zn(II) complexes in previous studies.

Graphical abstract: Aggregation-induced enhanced fluorescence emission of chiral Zn(ii) complexes coordinated by Schiff-base type binaphthyl ligands

Supplementary files

Article information

Article type
Paper
Submitted
27 mar 2024
Accepted
23 apr 2024
First published
24 apr 2024

Dalton Trans., 2024,53, 8926-8933

Aggregation-induced enhanced fluorescence emission of chiral Zn(II) complexes coordinated by Schiff-base type binaphthyl ligands

D. Tauchi, K. Kanno, M. Hasegawa, Y. Mazaki, K. Tsubaki, K. Sugiura, T. Shiga, S. Mori and H. Nishikawa, Dalton Trans., 2024, 53, 8926 DOI: 10.1039/D4DT00903G

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