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Luminescent Chains Formed from Neutral, Triangular Gold Complexes Sandwiching Tl I and Ag I . Structures of {Ag([Au(μ-C 2 ,N 3 -bzim)] 3 ) 2 }BF 4 ·CH 2 Cl 2 , {Tl([Au(μ-C 2 ,N 3 -bzim)] 3 ) 2 }PF 6 ·0.5THF (bzim = 1-Benzylimidazolate), and {Tl([Au(μ-C(OEt)═NC 6 H 4 CH 3 )] 3 ) 2 }PF 6 ·THF, with MAu 6 (M…

2000; American Chemical Society; Volume: 39; Issue: 15 Linguagem: Inglês

10.1021/ic991492n

1520-510X

Alfredo Burini, Rita Bravi, John P. Fackler, Rossana Galassi, Tiffany A. Grant, Mohammad A. Omary, Bianca Rosa Pietroni, Richard J. Staples,

Magnetism in coordination complexes

It has been found that several trinuclear complexes of AuI interact with silver and thallium salts to intercalate Ag+ and Tl+ cations, thereby forming chains. The resulting sandwich clusters center the cations between the planar trinuclear moieties producing structures in which six AuI atoms interact with each cation in a distorted trigonal prismatic coordination. The resultant (B3AB3B3AB3)infinity pattern of metal atoms also shows short (approximately 3.0 A) aurophilic interactions between BAB molecular centers. These compounds display a strong visible luminescence, under UV excitation, which is sensitive to temperature and the metal ion interacting with the gold. X-ray crystal structures are reported for Ag([Au(mu-C2,N3-bzim)]3)2BF4CH2Cl2 (P1, Z = 2, a = 14.4505(1) A; b = 15.098(2)A; c = 15.957(1)A; alpha = 106.189(3) degrees; beta = 103.551(5) degrees; gamma = 101.310(5) degrees); Tl([Au(mu-C2,N3-bzim)]3)2PF(6)05C4H8O (P1, Z = 2, a = 15.2093(1)A; b = 15.3931(4)A; c = 16.1599(4)A; alpha = 106.018(1) degrees; beta = 101.585(2) degrees; gamma = 102.068(2) degrees); and Tl([Au(mu-C(OEt)=NC6H4CH3)]3)2PF6.C4H8O (P2(1)/n, Z = 4, a = 16.4136(3)A; b = 27.6277(4)A; c = 16.7182(1)A; beta = 105.644(1) degrees). Each compound shows that the intercalated cation, Ag+ or Tl+, coordinates to a distorted trigonal prism of six AuI atoms. The counteranions reside well apart from the cations between the cluster chains.