Anion Exchange Properties and Application of Layr Structured Basic Metal Salts

与一种可互换的分层晶体的变体相比，另一种可互换的晶体非常罕见。这很可能是因为动物被用作建造单元，将其构造成晶体结构的框架，并与电路有很强的联系。氢化物类型分层双羟基（LDhs）是[M^<ii>_&lt;1-x&gt;M^<iii>^x （OH） _2]^x+Y^&lt;z-&gt;_&lt;x/z&gt; nH_2O的一般公式，是一个罕见的可替代晶体的示例。通常被引用为非离子粘土，LDH是smectite cationic粘土的结构性补充;对分层的积极电荷是由八重地层中的三重线的替代物产生的。电荷平衡的动物位于羟基层之间，并容易与各种动物交换。在先前的研究中，我们展示了基本铜盐Cu_2（OH）_3（OCOCH_3）·H_2O与肉毒杆菌型层结构展示了有趣的动物交换属性;乙酸化合物直接协调到铜盐可以与各种动物交换。在这项研究中，一种新型的可互换分层混合基本盐已经开发出来。标题组合的分层化合物（0.15&lt;x&lt;0.25）是由镍和锌的混合乙酸溶液的羟基氢化物制成的。结构可以被表征为Zn_5 （OH） _8Cl_2·H_2O type ; Ni^2+ions are in the Octahedral sites of Ni（OH）_2 layr with vacancies， and Zn^2+ions are in tetrahedral sites above and below the hydroxide layers。新分层复合物的交错乙酸与各种各样的动物如Cl-、Br-、I-、NO_3-、ClO_4-、CO_3^&lt;2-&gt;和SO_4^&lt;2-&gt;。反应是可逆的。用[Si_8 O_<20>]^8-ions交换结果在两个维度硅层的形成中类似于2 ： 1类型粘土矿物与swelling Properties。

In contrast to a variety of cation-exchangeable layred crystals, anion-exchangeable ones are very rare. This is probably because anions are used as building units constructing the framework of crystal structures, and strongly bound to cations. Hydrotalcite-type layred double hydroxides (LDHs) with a general formula of[M^<ii>_<1-x>M^<iii>^x (OH) _2]^x+Y^<z->_<x/z> nH_2O are exceptionally rare examples of anion-exchangeable crystals. As often referred to as anionic clays, LDHs are structural complements of smectite cationic clays ; the positive charge of the layrs are created by the substitution of divalent cations with trivalent ones in the octahedral layrs. The charge-balancing anions are located between the hydroxy layrs, and easily exchanged with various anions.In a previous study, we showed that basic copper salt Cu_2(OH)_3(OCOCH_3)・H_2O with the botallackite type layr structure exhibited interesting anion exchange properties ; the acetate ions directly coordinated to the copper ions were exchangeable with various anions. In this study, a new type of anion-exchangeable layred mixed basic salts have been developed. The layred compound with the title composition(0.15<x<0.25)was prepared by a hydrothermal hydrolysis of a mixed acetate solution of nickel and zinc. The structure can be characterized as the Zn_5 (OH) _8Cl_2・H_2O type ; Ni^2+ions are in the octahedral sites of Ni(OH)_2 layr with vacancies, and Zn^2+ions are in tetrahedral sites above and below the vacancies of the hydroxide layrs. The interlayr acetate ions of the new layred compound were topochemically exchanged with a variety of anions such as Cl-, Br-, I-, NO_3-, ClO_4-, CO_3^<2->, and SO_4^<2->. The reactions were reversible. Exchanging with[Si_8O_<20>]^8-ions resulted in the formation of two-dimensional silicate layrs similar to a 2 : 1 type clay mineral with swelling properties.