Heteroctanuclear Au4Ag4 Cluster Complexes of 4,5-Diethynylacridin-9-One with Luminescent Mechanochromism |
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| Authors: | Pei Xie Jin-Yun Wang Ya-Zi Huang Xue-Meng Wu Zhong-Ning Chen |
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| Institution: | 1.College of Chemistry, Fuzhou University, Fuzhou 350108, China;2.State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350100, China; (J.-Y.W.); (Y.-Z.H.); (X.-M.W.);3.Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China |
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| Abstract: | Two heteroctanuclear Au4Ag4 cluster complexes of 4,5-diethynylacridin-9-one (H2L) were prepared through the self-assembly reactions of Au(tht)2](CF3SO3), Ag(tht)(CF3SO3), H2L and PPh3 or PPh2Py (2-(diphenylphosphino)pyridine). The Au4Ag4 cluster consists of a Au4L4]4− and four Ag(PPh3)]+ or Ag(PPh2Py)]+ units with Au4L4 framework exhibiting a twisted paper clip structure. In CH2Cl2 solutions at ambient temperature, both compounds show ligand fluorescence at ca. 463 nm as well as phosphorescence at 650 nm for 1 and 630 nm for 2 resulting from admixture of 3IL (intraligand) of L ligand, 3LMCT (from L ligand to Au4Ag4) and 3MC (metal-cluster) triplet states. Crystals or crystalline powders manifest bright yellow-green phosphorescence with vibronic-structured emission bands at 530 (568sh) nm for complex 1 and 536 (576sh) nm for complex 2. 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. |
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| Keywords: | cluster gold heteronuclear luminescence mechanochromism silver |
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