1. Investigations of stable penta- and hexa-coordinate polynuclear Zn(II) and Cd(II) complexes derived from a single-armed salamo-based ligand.
- Author
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Li, Shi-Zhen, Li, Wen-Da, Yan, Yi-Bin, Zhang, Yang, and Dong, Wen-Kui
- Subjects
TRANSITION metal complexes ,SURFACE analysis ,TRANSITION metals ,SINGLE crystals ,ELEMENTAL analysis ,X-ray diffraction ,ETHANOL ,SCHIFF bases - Abstract
A penta-coordinated dinuclear Zn(II) complex, [Zn
2 (L)(μ-PhCOO)(EtOH)] (1), and a hexa-coordinate tetranuclear Cd(II) complex, [{Cd2 (L)(EtOH)(η-OAc)}2 ]·2CH2 Cl2 (2), have been synthesized by reactions of a single-armed salamo-based ligand, H3 L, and two kinds of transition metal salts, (Zn(NO3 )2 ·6H2 O and Cd(OAc)2 ·2H2 O), respectively. Complexes 1 and 2 have been characterized by elemental analyses, single crystal X-ray diffraction, IR spectra and UV-Vis spectra. Complex 1 is composed of a totally deprotonated ligand (L)3- moiety, two Zn(II) ions, one μ-PhCOO- counter-anion and one coordinated ethanol molecule. The (L)3- unit packages two Zn(II) ions, the μ-PhCOO- counter-anion bridges two adjacent Zn(II) ions and one ethanol molecule coordinates with the Zn2 ion, so that both Zn(II) ions are penta-coordinated with slightly distorted trigonal bipyramidal configurations, and the τ5 values of Zn1 and Zn2 are 0.86 and 0.65, respectively. Complex 2 consists of two discrete and similar electroneutral tetra-nuclear units, 2 A and 2B, and two crystallized dichloromethane molecules. Each unit has a symmetric structure that is made up of two completely deprotonated ligand (L)3- moieties, four Cd(II) ions, two η-OAc- counter-anions and two coordinated ethanol molecules. Fluorescence properties and Hirshfeld surfaces analyses have been studied as well. [ABSTRACT FROM AUTHOR]- Published
- 2023
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