Speciation of technetium-99 incorporated into metal oxide matrices

该奖项支持纽约市立大学亨特学院的Lynn C. Francesconi教授确定金属氧化物材料中锝的化学键、氧化还原化学和形态。多金属氧酸盐（POMs）将作为固态材料的模型，以获得有关99Tc在金属氧化物宿主中的化学和氧化还原稳定性和形态的关键信息。具体目标是：1)检查1-和2-威尔斯-道森POM异构体的空间和电子差异对锝的结合强度和氧化还原性能的影响。(2)以多金属氧酸盐结合特定低价锝核的空间和电子特性为函数，确定了锝-聚甲醛材料的稳定性。3)开发了一种还原高技术酸盐和稳定生成的低价Tc的新方法。该策略采用可调谐的还原POMs来转移电子，以使还原Tc高技术化和稳定。这个项目的一个更广泛的影响将是培养放射化学和放射性物质处理方面的博士后和研究生。这项研究还将利用亨特大学和纽约市立大学理科专业的大量少数族裔学生，为放射化学家的队伍带来多样性。通过与内华达大学拉斯维加斯分校和劳伦斯伯克利国家实验室的合作，该项目的培训部分得到了加强。

This award supports Professor Lynn C. Francesconi at CUNY Hunter College to determine the chemical bonding, redox chemistry, and speciation of technetium in metal-oxide materials. Polyoxometalates (POMs) will serve as models for solid-state materials to garner critical information concerning the chemical and redox stability and speciation of 99Tc in metal oxide hosts. The specific objectives are: 1) An examination of the impact of the steric and electronic differences of the 1- and 2- Wells-Dawson POM isomers on the binding strength and redox properties of technetium. 2) A determination of the stability of a technetium-POM materials as a function of the steric and electronic features of the polyoxometalate combined with specific low valent technetium cores. 3) Development of a new approach for the reduction of pertechnetate and stabilization of the generated low valent Tc. This strategy employs tunable reduced POMs to transfer electrons to pertechnetate and stabilize the reduced Tc. A broader impact of this project will be the training of postdocs and graduate students in radiochemistry and in the handling of radioactive materials. The research will also draw on the large pool of minority students in the sciences at Hunter and CUNY to bring diversity into the pool of radiochemists. The training component of this project is enhanced through collaborations with the University of Nevada-Las Vegas and Lawrence Berkeley National Laboratory.