Gashigullin Ruslan, Kendin Mikhail, Martynova Irina, Tsymbarenko Dmitry
Department of Materials Science, Lomonosov Moscow State University, Moscow 119991, Russia.
Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
Molecules. 2023 Aug 5;28(15):5896. doi: 10.3390/molecules28155896.
Rare-earth (RE, Ln) carboxylates are widely studied as precursors of RE oxide-based nanomaterials; however, no systematic studies of RE L-lactates (HLact = 2-hydroxypropanoic acid) have been reported to date. In the present work, a profound structural investigation of RE L-lactates is carried out. A family of RE lactate complexes of the general formula LnLact∙nHO (Ln = La, Ce-Nd, Sm-Lu, Y; = 2-3) are synthesized and characterized by CHN, TGA, and FTIR as well as by powder and single-crystal XRD methods.The existence of four novel structural types (-) is revealed. Compounds of the type (Ln = La, Ce, Pr) exhibit a chain polymeric structure, whereas - compounds are molecular crystals consisting of dimeric (; Ln = La, Ce-Nd) or monomeric (-Ln = Sm-Lu, Y; -Ln = Sm-Gd, Y) species. The crystal structures of - compounds are discussed in terms of their coordination geometry and supramolecular arrangement. Solutions of yttrium and lanthanum lactates with diethylenetriamine are applied for the chemical deposition of YO and LaO thin films.
稀土羧酸盐作为稀土氧化物基纳米材料的前驱体受到广泛研究；然而，迄今为止，尚未见有关稀土L-乳酸盐（HLact = 2-羟基丙酸）的系统研究报道。在本工作中，对稀土L-乳酸盐进行了深入的结构研究。合成了通式为LnLact∙nHO（Ln = La、Ce-Nd、Sm-Lu、Y；n = 2-3）的一系列稀土乳酸配合物，并通过CHN、TGA、FTIR以及粉末和单晶XRD方法对其进行了表征。揭示了四种新型结构类型（-）的存在。型化合物（Ln = La、Ce、Pr）呈现链状聚合结构，而-型化合物是由二聚体（；Ln = La、Ce-Nd）或单体（-Ln = Sm-Lu、Y；-Ln = Sm-Gd、Y）物种组成的分子晶体。从配位几何和超分子排列的角度讨论了-型化合物的晶体结构。将钇和镧乳酸盐与二亚乙基三胺的溶液用于YO和LaO薄膜的化学沉积。
