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Design and Synthesis of Calixarene‐Based Bis‐alkynyl‐Bridged Dinuclear Au I Isonitrile Complexes as Luminescent Ion Probes by the Modulation of Au⋅⋅⋅Au Interactions
Author(s) -
He Xiaoming,
Lam Wai Han,
Zhu Nianyong,
Yam Vivian WingWah
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200900422
Subject(s) - calixarene , chemistry , adduct , crown ether , luminescence , ligand (biochemistry) , metal , ion , stereochemistry , crystallography , ether , metal ions in aqueous solution , medicinal chemistry , molecule , materials science , organic chemistry , receptor , biochemistry , optoelectronics
Two calixarene‐based bis‐alkynyl‐bridged Au I isonitrile complexes with two different crown ether pendants, [{calix[4]arene‐(OCH 2 CONH‐C 6 H 4 C≡C) 2 }{Au(CNR)} 2 ] (R=benzo[15]crown‐5 ( 1 ); R=benzo[18]crown‐6 ( 2 )), together with their related crown‐free analogue 3 (R=C 6 H 3 (OMe) 2 ‐3,4) and a mononuclear gold(I) complex 4 with benzo[15]crown‐5 pendant, have been designed and synthesized, and their photophysical properties have been studied. The X‐ray structure of the ligand, calix[4]arene‐(OCH 2 CONH‐C 6 H 4 CCH) 2 has been determined. The cation‐binding properties of these complexes with various metal ions have been studied using UV/Vis, emission, 1 H 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.