Lanthanum-based coordination polymers microplates using a “green ligand” EDTA with tailorable morphology and fluorescent property
作者:Zhurui Shen、Sisi He、Pengcheng Yao、Xun Lao、Bin Yang、Yejing Dai、Xiaohong Sun、Tiehong Chen
DOI:10.1039/c3ra46829a
日期:——
In this work, lanthanum (La)-based coordination polymers (CPs) microplates were fabricated in a simple bottom-up way by hydrothermal reaction of La3+ and a âgreen ligandâ EDTA (ethylenediamine-N,N,Nâ²,Nâ²-tetraacetate). Under similar conditions, cerium (Ce)âEDTA CPs microplates could also be fabricated, which had the same crystalline phase and similar chemical composition to the LaâEDTA CPs. The formation mechanism of the LaâEDTA CPs was investigated and proved to follow the Ostwald ripening process. Moreover, its morphology could be tuned facilely by varying the quantity of EDTA and the total concentrations of reactants, and several kinds of micro/nanostructures were produced such as nanoparticle clusters, nanofibers, large or uniform microplates. Furthermore, the as-prepared LaâEDTA CPs exhibited green light emission property after doping with Tb3+, and La2O3 nanorods as well as CeO2 microplates were also prepared by calcination of their corresponding CPs precursors.
在这项研究中,通过La3+与 "绿色配体 "EDTA(乙二胺-N,N,N²,N²-四乙酸酯)的水热反应,以自下而上的简单方法制备了基于镧(La)的配位聚合物(CPs)微板。在类似条件下,还可以制备铈(Ce)âEDTA CPs 微板,与 LaâEDTA CPs 具有相同的结晶相和相似的化学成分。对 LaâEDTA CPs 的形成机理进行了研究,证明其遵循奥斯特瓦尔德熟化过程。此外,通过改变乙二胺四乙酸(EDTA)的用量和反应物的总浓度,可以方便地调整其形态,并制备出多种微/纳米结构,如纳米颗粒团、纳米纤维、大型或均匀的微板。此外,制备的 LaâEDTA 氯化石蜡在掺杂 Tb3+ 后具有绿光发射特性,通过煅烧相应的氯化石蜡前驱体还制备了 La2O3 纳米棒和 CeO2 微板。