College of Chemistry, Fuzhou University, Fuzhou 350108, China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350100, China.
Molecules. 2022 Mar 25;27(7):2127. doi: 10.3390/molecules27072127.
Two heteroctanuclear AuAg cluster complexes of 4,5-diethynylacridin-9-one (HL) were prepared through the self-assembly reactions of Au(tht), Ag(tht)(CFSO), HL and PPh or PPhPy (2-(diphenylphosphino)pyridine). The AuAg cluster consists of a [AuL] and four [Ag(PPh)] or [Ag(PPhPy)] units with AuL framework exhibiting a twisted paper clip structure. In CHCl solutions at ambient temperature, both compounds show ligand fluorescence at ca. 463 nm as well as phosphorescence at 650 nm for and 630 nm for resulting from admixture of IL (intraligand) of L ligand, LMCT (from L ligand to AuAg) and MC (metal-cluster) triplet states. Crystals or crystalline powders manifest bright yellow-green phosphorescence with vibronic-structured emission bands at 530 (568sh) nm for complex and 536 (576sh) nm for complex . Upon mechanical grinding, yellow-green emission in the crystalline state is dramatically converted to red luminescence centered at ca. 610 nm with a drastic redshift of the emission after crystal packing is destroyed.
两个异核 AuAg 簇配合物的 4,5-二乙炔基吖啶-9-酮 (HL) 通过自组装反应 [Au(tht)] (CFSO), Ag(tht)(CFSO), HL 和 PPh 或 PPhPy(2-(二苯基膦基)吡啶)。AuAg 簇由一个 [AuL] 和四个 [Ag(PPh)] 或 [Ag(PPhPy)] 单元组成，AuL 骨架呈现扭曲的回形针结构。在室温下的 CHCl 溶液中，两种化合物均显示出约 463nm 的配体荧光以及 650nm 的磷光（对于 ）和 630nm 的磷光（对于 ），这归因于 L 配体的 IL（内配体）、L 配体到 AuAg 的 LMCT（配体到金属簇的三重态）和 MC 混合。晶体或结晶粉末表现出明亮的黄绿光磷光，在 530（568sh）nm 处有带振动结构的发射带（对于配合物 ）和 536（576sh）nm 处有带振动结构的发射带（对于配合物 ）。在机械研磨过程中，结晶态下的黄绿光发射被显著转化为约 610nm 处的红光发光，在晶体堆积破坏后发射发生急剧红移。
