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以1,4-丁二胺(BDA,C4H12N2)为结构导向剂,在水热条件下合成了一例新型三维阴离子开放骨架磷酸铝化合物[C4H14N2][Al4P5O19OH](AlPO-BDA),用单晶X-射线衍射确定了其结构,并用X-射线粉末衍射(XRD)、扫描电子显微镜(SEM),热重以及元素分析等进行了表征。该开放骨架在[100]和[010]方向上分别具有8和12元环的椭圆形孔道,并相互交叉形成联通的二维孔道系统。以1,6-己二胺(HDA)、1,5-戊二胺(PDA)或2-甲基1,5-戊二胺(MPMD)为结构导向剂,在水热条件下也可得到与AlPO-BDA非常类似的开放骨架拓扑结构,表明这些有机胺在一定的条件下和1,4-丁二胺具有相同的拓扑结构导向作用,但有机胺的尺寸和形状对开放骨架的结晶学对称性及孔道形状有显著的影响,有机胺分子中N-N之间的距离同开放骨架的理论表面积和孔自由体积存在明确的相关性。
A new type of three-dimensional anionic open framework aluminum phosphate [C4H14N2] [Al4P5O19OH] (AlPO-BDA) was synthesized under hydrothermal conditions using 1,4-butanediamine (BDA, C4H12N2) The structures were confirmed by X-ray diffraction and characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry and elemental analysis. The open framework has eight- and twelve-membered elliptical cells in the [100] and [010] directions, respectively, and intersects each other to form a two-dimensional communicative cellular system. Hexamethylenediamine (HDA), 1,5-pentamethylenediamine (PDA) or 2-methylpentamethylenediamine (MPMD) as the structure-directing agent can also be obtained under hydrothermal conditions The open framework topologies, which are very similar to AlPO-BDA, show that these organic amines have the same topological orientation as 1,4-butanediamine under certain conditions, but the size and shape of the organic amine affect the crystallinity of the open framework Symmetry and pore shape have a significant impact, the distance between the NN molecules in organic amine molecules is clearly related to the theoretical open area of the open framework and pore free volume.