Derivatized and Nanoscale Polyoxometalate Cluster Anions

Michael T.乔治敦大学化学系的波普是 由无机，生物无机和有机化学 程序，以研究聚氧乙烯酸盐物种的化学。 这 研究方向是开发坚固的，水稳定的， （a）聚钨酸盐阴离子的官能化有机衍生物， 10-30个钨原子和一个到几个可以使用的其他原子类型 作为进一步衍生化的位点，和（B）大量的、可溶的离散的 含有100+个金属原子的纳米级尺寸的多氧阴离子。的 衍生化含铑的（a）型络合物的能力 铑将用于将聚氧乙烯酸盐偶联到核糖体上， X射线数据的定相。将制备额外的（a）类物种， 衍生化的多个位点。这些物种可用于 将催化活性多氧阴离子附着到聚合物上的载体 用于选择性电子密度成像的基底，以及其他 应用.类型（B）络合物的例子是76-阴离子 含有12个As，16个Ln，148个W，524个O原子和36个水分子。 这种阴离子是水溶性的，并且已经在晶体学上被证明是水溶性的。 表征了合成策略将被设计用于类似物的 其中As被其他第15族原子取代并且 含有多种镧系元素的那些。甚至， 将设计更大的集群。水解稳定性，结构， 电化学和其他性质将在溶液中进行研究 对于这些大的阴离子。将设计方法来耦合这些集群 阴离子到设计的扩展组件中。 聚氧乙烯酸盐是由金属和氧组成的大离子 原子的它们是有趣的，因为它们完全是无机的，因此 在很多情况下都是非常强大的。这次调查将 探索这两类离子的化学性质。第一个包含 10-30个金属原子，并且具有可以与其他化学物质连接的中心。 物种第二类是由质量很大的离子组成， 有数百个原子，而且是纳米级的这两类都是不寻常的， 因为它们溶于水并且在水中稳定。他们有潜力 作为离子交换和主体/客体材料，催化剂， 导电和磁性材料以及显示装置。

Dr Michael T. Pope, Chemistry Department, Georgetown University, is supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program, to investigate the chemistry of polyoxometalate species. This research is directed towards developing robust, water-stable, functionalized organic derivatives of (a) polytungstate anions containing 10-30 tungsten atoms and one to several other atom types that can be used as sites of further derivatization and (b) massive, soluble discrete polyoxoanions of nanoscale dimensions that contain 100+ metal atoms. The ability to derivatize rhodium containing type (a) complexes at the rhodium will be used to couple the polyoxometalate to ribosomes for phasing of x-ray data. Additional type (a) species will be prepared with multiple sites for derivatization. These species can be utilized for supporting agents to attach catalytically active polyoxoanions to polymer substrates, for selective electron-density imaging, and other applications. Type (b) complexes are exemplified by a 76- anion containing 12 As, 16 Ln, 148 W, and 524 O atoms plus 36 water molecules. This anion is water soluble and has been crystallographically characterized. Synthetic strategies will be designed for analogues of this species in which As is substituted by other group 15 atoms and for those that contain a variety of lanthanides. The preparation of even larger clusters will be devised. The hydrolytic stability, structures, electrochemistry and other properties will be investigated in solution for these large anions. Methods will be designed to couple these clusters anions into designed, extended assemblies. The polyoxometalates are a large ions composed of metal and oxygen atoms. They are of interest because they are wholly inorganic, and thus should be quite robust under many conditions. This investigation will explore the chemistry of two classes of these ions. The first contains 10-30 metal atoms and has centers that can be linked to other chemical species. The second class is composed of very massive ions that contain hundreds of atoms and are nano-sized. Both classes are unusual for because they dissolve in and are stable in water. They have potential applications as ion-exchange and host/guest materials, catalysts, conducting and magnetic materials, and display devices.