己二酸柱撑水滑石的制备及表征

水滑石（Layered Double Hydroxidex,简称LDHs）是一类具有层状结构的阴离子型粘土^1]。水滑石的一个重要性质是层间阴离子具有可交换性，引入不同的阴离子，能够得到不同结构和功能和柱撑水石滑，因而阴离子插层是水滑石研究的一个重要方向。各类阴离子如有机和无机阴离子、同多和杂多阴离子以及金属配合物阴离子的柱撑水滑石在文献中都有报道^2-5]。其中有机阴离子由于在结构上的多样性，使有机阴离子柱撑水滑石具有巨大的应用开发潜力，已经引起了人们的广泛关注^6-12]。

Synthesis and Characterization of Adipate-pillared LDHs

Layered double hydroxides (LDHs) or hydrotalcite-like materials of the type Mg1-xAlx(OH)2(Xn-)x/u·zH2O are most readily prepared when Xn- is the carbonate ion. Although many other LDHs undergo facile ion-exchange reactions, the carbonate ion in LDHs is known to be very difficult to replace by conventional ion-exchange. We have developed a simple synthesis of adipate-pillared LDHs of the type Mg4Al2 (OH)12O2C(CH2)4CO2]·4H2O by direct reaction of free adipic acid with an LDH carbonate precursor. The materials obtained have been characterized by XRD, FT-IR and DTA. It is shown that by appropriate choice of reaction conditions, the carbonate ions in the precursor can be completely replaced by adipate ions. The adipate-pillared LDHs retain a layered structure with an interlayer distance of 1.40nm. The interlayer adipate ions are lost on heating the material to 390℃.