Coordination-Driven Self-Assembled ZnII6-LnIII3 Metallocycles Based on a Salicylamide Imine Ligand: Synthesis, Structure, and Selective Luminescence Enhancement Induced by OAc–
| Autor: | Xue-Qin Song, Ali Alhafeez Abdulrheem Shamshoom, Cai-Yun Wang, Weisheng Liu, Huan-Huan Meng |
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| Rok vydání: | 2018 |
| Předmět: |
Denticity
010405 organic chemistry Chemistry Ligand Electrospray ionization Imine Salicylamide 010402 general chemistry 01 natural sciences 0104 chemical sciences Ion Inorganic Chemistry Crystallography chemistry.chemical_compound medicine Physical and Theoretical Chemistry Spectroscopy Luminescence medicine.drug |
| Zdroj: | Inorganic Chemistry. 57:10873-10880 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.8b01525 |
| Popis: | Five heterometallic ZnII6-LnIII3 macrocycles based on a salicylamide imine multidentate unsymmetrical ligand H2L [1-(2-hydroxy-3-methoxy-benzamido)-2-(2-hydroxy-3-methoxy-benzylideneamino)-ethane] have been prepared via a coordination-driven self-assembly strategy. Single-crystal X-ray diffraction analysis reveals that the five metallocycles are isomorphic with a formula of [Zn6Ln3L6(OH)2(NO3)4(H2O)]·3NO3· nCH3CN (ZnLn-1, where Ln = Pr, Nd, Eu, Tb, or Yb; for ZnPr-1, n = 4; for ZnNd-1, ZnEu-1, and ZnTb-1, n = 2; for ZnYb-1, n = 3), where six octadentate ligands L2- and two in situ-formed μ2-OH- ions bridged the alternating ZnII-LnIII-ZnII subunits into a macrocycle. Along with the structural novelty, ZnNd-1 shows distinctive enhanced emission in the visible and near-infrared range upon addition of OAc-. On the basis of ultraviolet-visible spectroscopy, 1H nuclear magnetic resonance, single-crystal X-ray diffraction, and high-resolution electrospray ionization mass spectrometry, we deduced that this emission enhancement could be attributed to the synergistic effect of TICT and the absent nonradiative transition of μ2-OH- induced distinctively by OAc- bridging. Our results demonstrate that the NdIII-containing heterometallic macrocycle can act as a host for anion exchanging and provide a nice example of heterometallic macrocycles with interesting properties and potential applications. |
| Databáze: | OpenAIRE |
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