摘要:
The heteropolynuclear complex [Tl{Au(C6Cl5)(2)}(n) reacts with sterically demanding diamines as tetramethylenediamine (TMDA), 2,2'-(ethylenedioxy)bis(ethylamine) (NOON), or triethylenetetramine (trien) in 1:1 molar ratio in tetrahydrofuran (THF), leading to products of stoichiometry [Tl{Au(C6Cl5)2}(L)] (L = TM-DA (1), NOON (2), or trien (3)) or [Tl-2{Au(C6Cl5)2}2(L)] (L = tfien (4)) when the solvent used is toluene. Addition of acetylacetone to the diamine complexes in 1:1 molar ratio generates [Tl{Au(C6Cl5)(2)}{O=C(CH3)CHC(CH3)NH(CH2)(4)NH2}](n) (5) and in 1:2 molar ratio [Tl{Au(C6Cl5)(2)}(L-x)](n) (L-x= {O=C(CH3)CHC(CH3)NHCH2CH2}(2) (6), {O=C(CH3)CHC(CH3)NHCH2CH2OCH2}(2) (7)). When the molar ratio is 1:2, with the exception of 3, all these complexes display luminescence in the solid state at room temperature and at 77 K. The origin of the luminescence could be assigned to a delocalizated exciton along the heterometallic chain formed by Au center dot center dot center dot Tl interactions. In addition, a red shift is observed when the temperature decreases, which is attributed to the shortening of the Au-Tl distance at lower temperatures. The emissive properties of solutions of 5-7 and [Tl{Au(C6Cl5)(2)}](n) in THF were studied after adding increasing amounts of different metal ions (Zn2+, Cd2+, Hg2+, Pb2+, Al3+, Ni2+, Ag+, Mn2+, Bi3+) and anions (F-, Cl-, Br-, I-, H2PO4-, ClO4-, Bz(-), Ac-, HSO4-, NO3-). Interestingly, an enhancement of the fluorescence emission intensity was observed for the complexes considered only upon addition of Br-, Cl-, and Ac-.