Design and Synthesis of Calixarene‐Based Bis‐alkynyl‐Bridged Dinuclear AuI Isonitrile Complexes as Luminescent Ion Probes by the Modulation of Au⋅⋅⋅Au Interactions |
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| Authors: | Xiaoming He Wai Han Lam Nianyong Zhu Vivian Wing‐Wah Yam |
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| Institution: | Centre for Carbon‐Rich Molecular and Nano‐Scale Metal‐Based Materials Research, Department of Chemistry and HKU‐CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong (China) |
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| Abstract: | Two calixarene‐based bis‐alkynyl‐bridged AuI isonitrile complexes with two different crown ether pendants, {calix4]arene‐(OCH2CONH‐C6H4C≡C)2}{Au(CNR)}2] (R=benzo15]crown‐5 ( 1 ); R=benzo18]crown‐6 ( 2 )), together with their related crown‐free analogue 3 (R=C6H3(OMe)2‐3,4) and a mononuclear gold(I) complex 4 with benzo15]crown‐5 pendant, have been designed and synthesized, and their photophysical properties have been studied. The X‐ray structure of the ligand, calix4]arene‐(OCH2CONH‐C6H4C?CH)2 has been determined. The cation‐binding properties of these complexes with various metal ions have been studied using UV/Vis, emission, 1H NMR, and ESI‐MS techniques, and DFT calculations. A new low‐energy emission band associated with Au???Au interaction could be switched on upon formation of the metal ion‐bound adduct in a sandwich fashion. |
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| Keywords: | aurophilicity calixarenes crown compounds luminescence sensors |
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