Recognition and Luminescence Properties of N^C^N Pt(II) Complexes with Macrocyclic Host Cucurbit[10]uril
Received date: 2022-02-20
Online published: 2022-04-01
Supported by
National Natural Science Foundation of China(21871216); National Natural Science Foundation of China(21901194)
Transition metal complexes have been widely studied due to their unique photophysical and chemical properties. In order to further explore the influence of host-guest interaction on luminescent property of Pt complexes, three different substituted water-soluble Pt complexes were designed and synthesized. Cucurbit[10]uril (CB[10]), with the largest cavity among the cucurbit[n]uril family, was selected as the host molecule. The 1H NMR titration experiments proved CB[10] binded three guests with 1∶2 stoichiometry, and the 1,3-di(2-pyridyl)benzene (N^C^N) ligand part on the guest molecule was encapsulated antiparallelly in the cavity of CB[10] in a head-to-tail manner. Mass spectrometry characterization further proved the binding between host and guest with 1∶2 stoichiometry. The low-energy absorption peaks of N^C^N Pt(II) complexes at >400 nm attributed to metal-metal-to-ligand charge transfer (MMLCT) were enhanced upon binding with CB[10]. Compared to free [2,6-di(2-pyridinyl)phenyl][3-(trimethylammonio)-1-propyn-1-yl]platinum(II) chloride (Pt-1), the 3IL emission intensity of its complex with CB[10] was enhanced dominantly. The [methyl 3,5-di(2-pyridyl)benzoato][3-(tri- methylammonio)-1-propyn-1-yl]platinum(II) chloride (Pt-2) showed visible red phosphorescence emission at 648 nm which was attributed to 3MMLCT in aqueous solution. Interestingly, binding with CB[10] led to a red-shift to 667 nm, which was closer to near-infrared emission. Besides, the phosphorescence lifetime is enhanced by 1.5 times (14.64 to 23.74 μs), and the quantum yield is enhanced by 15.6 times (2.7% to 42%) upon the host-guest complexation. The luminescent property of [4-methoxy-2,6-di(2-pyridinyl)phenyl][3-(trimethylammonio)-1-propyn-1-yl]platinum(II) chloride (Pt-3) was similar to that of Pt-2. Further research on the luminescence changes of Pt complexes before and after grinding in solid state indicated that the host-guest complex showed bigger red-shift of emission wavelength than free guest. The above results showed that the host-guest interactions based on CB[10] could shorten the distance between the platinum atoms of the two included guest molecules, thus enhancing metal-metal interaction and π-π interaction of the host-guest complexes.
Shimin Zhu , Xin Huang , Xie Han , Simin Liu . Recognition and Luminescence Properties of N^C^N Pt(II) Complexes with Macrocyclic Host Cucurbit[10]uril[J]. Acta Chimica Sinica, 2022 , 80(8) : 1066 -1070 . DOI: 10.6023/A22020078
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