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A series of luminescent dinuclear gold(I) complexes with different crown ether pendants, [Au2(P∧P)(S-B15C5)2] [S-B15C5 = 4'-mercaptobenzo-15-crown-5, P∧P = bis(dicyclohexylphosphino)methane (dcpm) (1), bis(diphenylphosphino)methane (dppm) (2)] and [Au2(P∧P)(S-B18C6)2] [S-B18C6 = 4'-mercaptobenzo-18-crown-6, P∧P = dcpm (3), dppm (4)], and their related crown-free complexes, [Au2(P∧P)(SC6H3(OMe)2-3,4)2] [P∧P = dcpm (5), dppm (6)], were synthesized. The low-energy emission of the mercaptocrown ether-containing gold(I) complexes are tentatively assigned as originated from states derived from a S → Au ligand-to-metal charge transfer (LMCT) transition. The crown ether-containing gold(I) complexes showed specific binding abilities toward various metal cations according to the ring size of the crown pendants. Spectroscopic evidence was provided for the metal-ioninduced switching on of the gold···gold interactions upon the binding of particular metal ions in a sandwich binding mode. [ABSTRACT FROM AUTHOR]

Two novel ethynylcrown ether containing di- and tetranuclear gold(i) complexes have been synthesized and structurally characterized; their binding ability toward various metal ions has also been studied. [ABSTRACT FROM AUTHOR]

A series of platinum(ll) terpyridyl alkynyl complexes that have been derivatized with basic amino functionalities, [Pt(tpy)(C≡C-C6H4-NR2-4]X (X = Otf¯, R = CH3 1, R = CH2CH2OCH3 2, R = H 3; X = CI¯, R = CH3 4, R = CH2CH2OCH3 5, R = H 6) (tpy = 2,2′:6′,2″-terpyridine), have been synthesized and characterized. Their photophysical responses at various acid concentrations were studied. The abilities of the complexes to function as colorimetric and luminescence pH sensors were demonstrated with dramatic color changes and luminescence enhancement upon introduction of acid. [ABSTRACT FROM AUTHOR]