Abstract
A new tetranuclear zinc(II) complex with an asymmetrical Salamo-type chelating ligand, H3L (5-methoxy-6′-hydroxy-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol), was synthesized and characterized using FT-IR, elemental analyses, X-ray single crystal diffraction method, UV-Vis, and fluorescence spectra. The zinc(II) complex possesses the cell parameters a = 8.1960(7) Å, b = 9.8127(8) Å, c = 16.5428(15) Å, Z = 1, V = 1172.5(2) Å3, R1 = 0.0722, and wR2 = 0.1558, and crystallizes in the triclinic system, with space group P-1. X-ray crystal structure analysis reveals that Zn1 and Zn2 atoms are all pentacoordinated and adopt slightly twisted tetragonal pyramidal and trigonal bipyramidal geometries. The zinc(II) complex forms a 1D supramolecular chain via intermolecular hydrogen bonds along the b axis. Besides, the fluorescence properties have been discussed.
Highlights
Over the past years, research has shown the Salen-type [1,2,3,4,5,6,7,8] and Salamo-type [9,10,11,12,13,14,15,16,17] compounds to be exceptionally good chelating ligands in in the fields of organometallic chemistry and coordination chemistry
Drastic changes in characteristics of the previous complexes, and novel properties could be obtained through the asymmetric configuration
The zinc(II) complex crystal structure is depicted in Figure 2, while Table 3 shows the list of important bond distances and bond angles
Summary
Research has shown the Salen-type [1,2,3,4,5,6,7,8] and Salamo-type [9,10,11,12,13,14,15,16,17] compounds to be exceptionally good chelating ligands in in the fields of organometallic chemistry and coordination chemistry. Research on Salen-type compounds has yet to be fully explored. Their complexes often form supramolecular systems that have unique structures, a novel bonding pattern, a specific microstructure, and excellent macroscopic properties by the intermolecular association of the weak non-covalent bonding [43,44,45]. Drastic changes in characteristics of the previous complexes, and novel properties could be obtained through the asymmetric configuration. A new asymmetrical Salamo-type compound, 5-methoxy-60 -hydroxy-2,20 -(ethylenedioxybis(nitrilomethylidyne))diphenol (H3 L) and its zinc(II) complex, were designed and synthesized and structurally characterized
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