Department of Nanoscience, Faculty of Engineering, Sojo University, 4-22-1 Ikeda, Nishi-ku, Kumamoto 860-0082, Japan.
Molecules. 2022 May 19;27(10):3262. doi: 10.3390/molecules27103262.
The self-assembly of discrete cyanometallates has attracted significant interest due to the potential of these materials to undergo soft metallophilic interactions as well as their optical properties. Diblock copolypeptide amphiphiles have also been investigated concerning their capacity for self-assembly into morphologies such as nanostructures. The present work combined these two concepts by examining supramolecular hybrids comprising cyanometallates with diblock copolypeptide amphiphiles in aqueous solutions. Discrete cyanometallates such as [Au(CN)], [Ag(CN)], and [Pt(CN)] dispersed at the molecular level in water cannot interact with each other at low concentrations. However, the results of this work demonstrate that the addition of diblock copolypeptide amphiphiles such as poly-(L-lysine)--(L-cysteine) (Lys--Cys) to solutions of these complexes induces the supramolecular assembly of the discrete cyanometallates, resulting in photoluminescence originating from multinuclear complexes with metal-metal interactions. Electron microscopy images confirmed the formation of nanostructures of several hundred nanometers in size that grew to form advanced nanoarchitectures, including those resembling the original nanostructures. This concept of combining diblock copolypeptide amphiphiles with discrete cyanometallates allows the design of flexible and functional supramolecular hybrid systems in water.
由于这些材料具有进行软金属亲合相互作用以及光学性质的潜力，离散氰金属配合物的自组装引起了人们的极大兴趣。关于二嵌段多肽两亲物自组装成纳米结构等形态的能力也进行了研究。本工作通过在水溶液中检查由离散氰金属配合物与二嵌段多肽两亲物组成的超分子杂化物，将这两个概念结合在一起。在低浓度下，以分子水平分散在水中的离散氰金属配合物如[Au(CN)]、[Ag(CN)]和[Pt(CN)]不能相互作用。然而，这项工作的结果表明，向这些配合物的溶液中添加二嵌段多肽两亲物，如聚（L-赖氨酸）-（L-半胱氨酸）（Lys-Cys），会诱导离散氰金属配合物的超分子组装，从而产生源自具有金属-金属相互作用的多核配合物的光致发光。电子显微镜图像证实了形成了数百纳米大小的纳米结构，这些纳米结构生长形成了先进的纳米结构，包括那些类似于原始纳米结构的结构。将二嵌段多肽两亲物与离散氰金属配合物结合的这种概念允许在水中设计灵活且功能强大的超分子杂化系统。
