首页> 外文期刊>Chemistry: A European journal >Reversible Transformation of Zn~(II)Coordination Geometry in a Single Crystal of Porous Metal-Organic Framework[Zn3(ntb)2(EtOH)2]·4EtOH
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Reversible Transformation of Zn~(II)Coordination Geometry in a Single Crystal of Porous Metal-Organic Framework[Zn3(ntb)2(EtOH)2]·4EtOH

机译:多孔金属-有机骨架[Zn3(ntb)2(EtOH)2]·4EtOH单晶中Zn〜(II)配位几何的可逆转变

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摘要

A 3D porous metal-organic framework[Zn3(ntb)2(EtOH)2]_n·4nEt-OH(1)that generates 1D channels of honeycomb aperture has been pre pared by the solvothermal reaction of Zn(NO3)2·6H2O and 4,4',4"-nitrilotris-benzoic acid(H3NTB)in EtOH at 110 deg C.Framework 1 exhibits reversible single-crystal-to-single-crystal transfor mations upon removal and rebinding of the coordinating EtOH as well as the EtOH guest molecules,which give rise to desolvated crystal[Zn3(ntb)2]_n(1')and resolvated crystal[Zn3(ntb)2-(EtOH)2]_n·4nEtOH(1").The X-ray structures indicate that 3D host frame work is retained during the transforma tions from 1 to 1'and from 1'to 1",but the coordination geometry of Zn~(II)ions changes from/to trigonal bipyramid to/from tetrahedron,concomitant with the rotational rearrangement of a car-boxylate plane of the NTB3 relative to its associated phenyl ring.To retain the single crystal integrity,extensive coop erative motions must exist between the molecular components throughout the crystal.Framework Y exhibits perma nent porosity,thermal stability up to 400 deg C,and blue luminescence,and high storage capabilities for N2,H2,CO2,and CH4.
机译:通过Zn(NO3)2·6H2O与溶剂的热反应制备了3D多孔金属有机骨架[Zn3(ntb)2(EtOH)2] _n·4nEt-OH(1),产生了蜂窝孔的一维通道。 110℃下的EtOH中的4,4',4“-硝化苯甲酸(H3NTB)。框架1在除去和重新结合配位EtOH和EtOH后显示出可逆的单晶至单晶转化客体分子,产生去溶剂化的晶体[Zn3(ntb)2] _n(1')和再溶解的晶体[Zn3(ntb)2-(EtOH)2] _n·4nEtOH(1“)。X射线结构表明在从1到1'和从1'到1“的转换过程中保留了3D主体框架,但是Zn〜(II)离子的配位几何形状从/向三角双锥体转变为/从四面体转变,伴随着旋转NTB3的羧基平面相对于其相关联的苯环的重排。要保持单晶的完整性,在整个哭声中分子成分之间必须存在广泛的协同运动tal.Y框架显示出永久的孔隙率,高达400摄氏度的热稳定性,蓝色发光以及对N2,H2,CO2和CH4的高存储能力。

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