该论文报道了式[Fe(bpp)2 ](C 6 H 8 O 4)·4H 2 O(1 ·4H 2 O),[ Fe(bpp)2 ](C 8 H 4 O 4)·2CH 3 OH·H 2 O(2 ·2MeOH·H 2 O)和[Fe(bpp)2 ](C 8 H 4 O 4)·5H 2 O(2 ·5小时2O)(bpp = 2,6-双(吡唑-3基)吡啶; C 6 H 8 O 4=己二酸二阴离子; C 8 H 4 O 4=对苯二甲酸二阴离子)。这些盐在低旋转铁(II)配合物和羧酸二价阴离子之间显示出复杂的氢键网络,溶剂分子位于空隙中。去溶剂化伴随着材料中的从低旋转(LS)到高旋转(HS)的转变。脱水相2经历两步过渡,第二步显示出热滞现象(T 1/2 ↑= 139 K,T 1/2 ↓= 118 K)。2个显示定量的LS到HS的光磁转换,T(LIESST)值为63 K.
Mechanochemical Synthesis and Characterization of Alkaline Earth Metal Terephthalates:<i>M</i>(C<sub>8</sub>H<sub>4</sub>O<sub>4</sub>)·<i>n</i>H<sub>2</sub>O (<i>M</i>= Ca, Sr, Ba)
The mechanochemicalsynthesis offers an easy access to obtain alkalineearthmetalterephthalatesM(C8H4O4)·nH2O (M = Ca, Sr, Ba). In the presented study we describe for the first time the mechanochemicalsynthesis of powders of Ca(C8H4O4)·3H2O, Ca(C8H4O4), Sr(C8H4O4)·H2O, and Ba(C8H4O4), which so far were only synthesized as single crystals from aqueous solutions or by reactions in an autoclave. Furthermore
机械化学合成提供了一种容易获得碱土金属对苯二甲酸盐 M(C8H4O4)·n (M = Ca, Sr, Ba) 的途径。在本研究中,我们首次描述了 Ca( )·3 、Ca( )、Sr( )·H2O 和 Ba( ) 粉末的机械化学合成,这些粉末迄今为止仅以单晶形式合成来自水溶液或通过高压釜中的反应。此外,制备了一种新的水合物 Ba( )·2(1.5) ,目前文献中没有描述过。所有化合物均通过 X 射线粉末衍射、热分析、元素分析、FT-IR 和 MAS NMR 光谱测量进行表征。
Proton conduction in a highly stable BaII coordination polymer constructed by p-phthalic acid
作者:Ning-Ning Ji、Zhi-Qiang Shi、Yin-Xia Liu、Gang Li
DOI:10.1016/j.poly.2020.114642
日期:2020.9
The design of new crystalline porous proton-conducing materials becomes an urgent demand because of the increasing demand of energy. Metal-organic frameworks (MOFs), or porous coordination polymers (PCPs), have been proved to be ideal candidates for proton-conducting materials in recent years due to their tailorable structures, good crystallinity, and functionalizable porosity. In order to search for new crystalline porous proton-conducing material with high proton conductivity, a new Ba-II coordination polymer based on a simple ligand p-phthalic acid, namely, [Ba(p-BDC)](n) (1) [p-H2BDC = 1,4-benzenedicarboxylic acid], has been successfully synthesized under solvothermal conditions and structurally characterized. 1 exhibits a three-dimensional framework with a pillared-layered structure. 1 was found to be stable in aqueous solution with pH values ranging from 1 to 11 as well as in (boiling) water. 1 shows a high proton conductivity value of 2.5 x 10(-4) S.cm(1) at 98% RH and 100 degrees C. In addition, through structural analysis and calculated E-a values, the proton conducting mechanism was highlighted. (C) 2020 Elsevier Ltd. All rights reserved.