Abstract
Two newly designed complexes, [Zn(L1)(EtOH)] (1) and [{Zn(L2)(OAc)2}2Zn]·CHCl3 (2) derived from salamo and half-salamo chelating ligands (H2L1 and HL2) have been synthesized and characterized by elemental analyses, IR and UV-VIS spectra, fluorescence spectra, and X-ray crystallography. Complex 1 shows a slightly distorted tetragonal pyramid and forms an infinite 3D supramolecular structure. All of the Zn(II) ions in complex 2 are hexa-coordinated with slightly distorted octahedral geometries. Complex 2 possesses an infinite 2D space structure. The fluorescence titration experiments were used to characterize fluorescence properties of complexes 1 and 2. And the normalized fluorescent spectra exhibit that complexes 1 and 2 have favourable fluorescent emissions in different solvents.
Highlights
Salen-type ligands (R–CH=N–(CH2 )2 –N=CH–R) and their metal complexes have been extensively investigated in modern coordination chemistry for several decades [1,2,3,4,5], which have been extensively investigated in potential application in biological fields [6,7,8,9,10,11,12,13], electrochemical conducts [14,15], nonlinear optical materials [16,17,18,19,20], magnetic materials [21,22,23,24,25], luminescence properties [26,27,28,29,30,31,32], and supramolecular architecture [33,34,35,36,37], and so on
Chemical modifications of substituent or functional groups in the Salen N2 O2 ligands are effective in exchanging the structures or the main functions of complexes, such as salamo ligand, a Salen analogue, (R–CH=N–O–(CH)n –O–N=CH–R) is one of the most versatile ligands and the large electronegativity of oxygen atoms is expected to strongly affect the electronic properties of the N2 O2 coordination sphere, which can lead to different and novel structures and properties of the resulting complexes [38]
Half-salen ligands and their metal complexes have been extensively investigated in modern coordination chemistry for a long time [42,43], but at present, no literature has shown that half-salamo ligands and their metal complexes have been synthesized
Summary
Salen-type ligands (R–CH=N–(CH2 )2 –N=CH–R) and their metal complexes have been extensively investigated in modern coordination chemistry for several decades [1,2,3,4,5], which have been extensively investigated in potential application in biological fields [6,7,8,9,10,11,12,13], electrochemical conducts [14,15], nonlinear optical materials [16,17,18,19,20], magnetic materials [21,22,23,24,25], luminescence properties [26,27,28,29,30,31,32], and supramolecular architecture [33,34,35,36,37], and so on. The Zn(II) ion does not produce spectroscopic or magnetic signals because of its 3d10 4s0 electronic configuration, when the Zn(II) ion forms complexes with ligands, the complexes generally have fluorescence properties [40,41]. Half-salen ligands and their metal complexes have been extensively investigated in modern coordination chemistry for a long time [42,43], but at present, no literature has shown that half-salamo ligands and their metal complexes have been synthesized
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