Molecular Design and Catalysis of Layred Zirconium Phosphonate

有机膦酸锆的化合物通式为Zr(O_3PR)_2，可以得到具有不同层状结构的结晶形式。研究了二维膦酸锆衍生物的制备和表征。用X射线衍射仪、~(13)t；13&gt；C~-和~(31)t；~(31)gt；P-MASNMR研究和表征了单晶相中的两种复合型磷酸锆盐(悬垂型和柱层型)，这些化合物是由磷酸锆盐或有机磷酸盐组成的片层结构。每一层都由通过膦酸基连接的锆平面组成，这些基团在Zr原子平面的上下交替，在层间区域以双层方式远离基面。通过乙酸酯化反应考察了该催化剂在磷酸锆上的催化性能。当复合膦酸锆单晶相具有酸性功能和疏水功能时，催化剂在反应介质中不发生溶胀，表现出较高的催化活性。该复合材料可与任何反应物分子接触，并改善疏水性。

Zirconium organophosphonates, whose compounds have the general formula Zr(O_3PR)_2 can be obtained in crystalline forms with various layred structures. The preparation and characterization of two-dimensional zirconium phosphonate derivatives have been investigated. Two composite zirconium phosphonates (pendant and pillared) in single crystal phase have also been invesigated and characterized by XRD,_<13>C-, and _<31>P-MASNMR.These compounds are lamellar structures comprising zirconium phosphated or organophosphonates. Each layr consists of planes of zirconium bridged through phosphonate groups that alternate above and below the Zr atom planes, oriented away from the basal surfaces in a bilayred fashion in the interlayr region. The catalytic performance over zirconium phosphonate is evaluated by esterification of acetic acid. When the composite zirconium phosphonate is composed with an acidic function and with a hydrophobic function in single crystal phase, the catalytic activity showed a higher activity without swelling of the catalyst in the reaction media. The composite materials become accessible to any reactant molecule and improve hydrophobicity.