European Journal of Inorganic Chemistry
European Journal of Inorganic Chemistry
3 years ago

Synthesis, Characterization, and Selective Sr2+ Sensing Study of Copper(I)-Bridged Calix[4]arene-Based Binuclear Alkynylplatinum(II) Complexes

Synthesis, Characterization, and Selective Sr2+ Sensing Study of Copper(I)-Bridged Calix[4]arene-Based Binuclear Alkynylplatinum(II) Complexes
Yu-Zhe Chen, Li-Zhu Wu, Chen-Ho Tung, Bin Chen, Ge-Xia Wang, Dun Pan
Three copper(I)-bridged p-tert-butylcalix[4]arene-tethered binuclear 6-aryl-2,2′-bipyridine (C^N^N) alkynylplatinum(II) complexes were designed and synthesized. Their photophysical properties and sensing ability to strontium ions (Sr2+) were investigated in terms of UV/Vis absorption, emission, and 1H NMR spectroscopy and MS. The binuclear complex bearing aza[15]crown-5 pendants exhibited a unique emission enhancement at ca. 750 nm toward Sr2+ ions, a result of altering the lowest excited state from the nonemissive ligand-to-ligand charge-transfer state to the emissive metal–metal-to-ligand charge-transfer state. A 1:1 sandwiched binding mode between Sr2+ and the two aza[15]crown-5 moieties in the complex was proposed.Copper-bridged calix[4]arene-based binuclear alkynylplatinum(II) complexes are designed. The binuclear complex bearing aza[15]crown-5 pendants exhibits a unique emission enhancement at ca. 750 nm toward Sr2+ ions, a result of altering the lowest excited state from the nonemissive ligand-to-ligand charge-transfer (LLCT) state to the emissive metal–metal-to-ligand charge-transfer (MMLCT) state.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700672

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