Abstract
A hetero-hexanuclear Zn(II)-La(III) coordination compound, [{(ZnL)2La}2(bdc)2](NO3)2 (H2bdc = terephthalic acid) has been synthesized with a symmetric Salamo-like bisoxime, and characterized by elemental analyses, IR, UV-Vis, fluorescent spectroscopy, and single-crystal X-ray diffraction analysis. All of the Zn(II) ions are pentacoordinated by N2O2 donator atoms from the (L)2− unit and one oxygen atom from one terephthalate anion. The Zn(II) ions adopt trigonal bipyramidal geometries (τZn1 = 0.61, τZn2 = 0.56). The La(III) ions are decacoordinated in the Zn(II)-La(III) coordination compound and has a distorted bicapped square antiprism geometry. Meanwhile, the photophysical property of the Zn(II)-La(III) coordination compound was also measured and discussed.
Highlights
Salen-like (N,N-bis(salicylidene)ethylenediamine) N2 O2 compounds are a class of the most versatile multidentate chelating ligands and could form stable mono- or multi-nuclear metal coordination compounds with alkaline earth, rare earth, and d-block transition metal ions [1,2,3,4,5,6,7,8,9]
Salen-like ligands and their corresponding metal coordination compounds have been proverbially studied in recent decades [10,11,12,13,14,15,16], these metal coordination compounds are used as precursors to obtain a great deal of oligometallic coordination compounds own to the high coordination abilities [17,18,19,20,21]
Our research mostly concentrated on the syntheses, crystal structures and properties of Salamo-like (1,2-bis(salicylideneaminooxy)ethane) derivatives and their metal coordination compounds
Summary
Salen-like (N,N-bis(salicylidene)ethylenediamine) N2 O2 compounds are a class of the most versatile multidentate chelating ligands and could form stable mono- or multi-nuclear metal coordination compounds with alkaline earth, rare earth, and d-block transition metal ions [1,2,3,4,5,6,7,8,9]. The O4 site of 3-alkoxy Salamo-like derivatives is suitable for alkali metals, alkaline earth metals and rare earth metal ions to obtain heteromulti-nuclear coordination compounds [25,26,27,28]. These hetero-metallic Salamo-like coordination compounds have been studied for their catalytic activities [29,30], biological activities [31], and fluorescence properties [32,33,34]. The supra-molecular features and photophysical properties of the Zn(II)-La(III) coordination compound are discussed in detail
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