Sensitivity of a solid Eu(Ⅲ) complex towards acetonitrile vapor:Structural and spectroscopic characterization
来源期刊：Journal of Rare Earths2020年第5期
论文作者：Fabio Piccinelli Veronica Paterlini Magda Monari Marco Bettinelli
文章页码：571 - 576
摘 要：The Eu（Ⅲ） nitrate complex of the meso-N,N’-bis（2-pyridylmethylene）-1,2-（R,S）-cyclohexanediamine ligand was synthesized and characterized by single crystal and powder X-ray diffraction.The crystal lattice of the complex is capable of absorbing and desorbing selectively acetonitrile molecules,at 293 K upon an acetonitrile vapor pressure of ～0.1 × 105 Pa.This process,which is partially reversible,can be easily followed by both powder X-ray diffraction（P-XRD） and Eu（III） luminescence spectroscopy.The acetonitrile molecule,located in the outer coordination sphere of the metal ion,does not affect the radiative transition probability of 5 D0 level of Eu（Ⅲ） and also it does not activate further non-radiative channels from this level.On the other hand,this molecule is capable of affecting the energy position and intensities of the crystal field components of the 5 D0 →7 F2 transition.The complex in solid form can be considered a promising material for the optical sensing of acetonitrile vapors.
Fabio Piccinelli1，Veronica Paterlini1，Magda Monari2，Marco Bettinelli1
1. Luminescent Materials Laboratory,DB,Universita di Verona,and INSTM,UdR Verona2. Dipartimento di Chimica “G.Ciamician”,Universita di Bologna
摘 要：The Eu（Ⅲ） nitrate complex of the meso-N,N’-bis（2-pyridylmethylene）-1,2-（R,S）-cyclohexanediamine ligand was synthesized and characterized by single crystal and powder X-ray diffraction.The crystal lattice of the complex is capable of absorbing and desorbing selectively acetonitrile molecules,at 293 K upon an acetonitrile vapor pressure of ～0.1 × 105 Pa.This process,which is partially reversible,can be easily followed by both powder X-ray diffraction（P-XRD） and Eu（III） luminescence spectroscopy.The acetonitrile molecule,located in the outer coordination sphere of the metal ion,does not affect the radiative transition probability of 5 D0 level of Eu（Ⅲ） and also it does not activate further non-radiative channels from this level.On the other hand,this molecule is capable of affecting the energy position and intensities of the crystal field components of the 5 D0 →7 F2 transition.The complex in solid form can be considered a promising material for the optical sensing of acetonitrile vapors.
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