A. M. Butlerov Institute of Chemistry, Kazan Federal University, Kremlevskaya ul. 18, Kazan, 420008, Russia.
Kazan Zavoisky Physical-Technical Institute of the Kazan Scientific Center of the Russian Academy of Sciences, Sibirskii trakt 10/7, Kazan, 420029, Russia.
Phys Chem Chem Phys. 2017 May 31;19(21):13788-13797. doi: 10.1039/c7cp01393k.
The non-zeolitic behavior of l-leucyl-l-leucine and its self-organization in solid state and from solutions with the formation of different nanostructures are reported. This dipeptide forms porous crystals, but does not exhibit molecular sieve effects typical of classical zeolites and biozeolites. The specific sorption properties of l-leucyl-l-leucine result from a change in its crystal packing from channel-type to layered-type, when binding strong proton acceptors or proton donors of molecular size greater than 18-20 cm mol. The high sorption capacity of l-leucyl-l-leucine toward dichloromethane results from the self-organization of the dipeptide, by forming nanofibers or web-like structures. The low thermal stability of clathrates of the dipeptide containing large guest molecules and the selectivity of l-leucyl-l-leucine toward alcohols over nitriles can be used to separate organic mixtures such as methanol/n-butanol and methanol/acetonitrile.
本文报道了 L-亮氨酰-L-亮氨酸的非沸石行为及其在固态和溶液中自组装形成不同纳米结构的情况。这种二肽形成多孔晶体，但不表现出典型的沸石和生物沸石的分子筛效应。L-亮氨酰-L-亮氨酸的特殊吸附性能是由于其晶体堆积从通道型转变为层状型，当结合大于 18-20 cm mol 的分子尺寸的强质子受体或质子给体时。L-亮氨酰-L-亮氨酸对二氯甲烷的高吸附容量源于二肽的自组装，通过形成纳米纤维或网状结构。含有大客体分子的二肽包合物的低热稳定性和 L-亮氨酰-L-亮氨酸对醇的选择性高于腈，可以用于分离甲醇/正丁醇和甲醇/乙腈等有机混合物。
