Abstract
Cyclic digold(I) complexes, containing bridging diphosphine and diacetylide ligands and with 15- to 22-membered rings, are reported. Oligomeric complexes [C6H4(OCH2C⋮CAu)2]n were prepared from AuCl(SMe2) and o-, m-, or p-bis(propargyloxy)benzene and then reacted with the diphosphines Ph2P(CH2)nPPh2 (n = 1−6) to give the corresponding ring complexes [C6H4(OCH2C⋮CAu)2{μ-Ph2P(CH2)nPPh2}]. Alternatively, a two-step procedure in which the soluble isocyanide complex [p-C6H4(OCH2C⋮CAuCNtBu)2] was prepared, followed by displacement of the isocyanide ligands by the diphosphine, could be used. The complexes [m-C6H4(OCH2C⋮CAu)2(μ-Ph2PCH2PPh2)], [m-C6H4(OCH2C⋮CAu)2{μ-Ph2P(CH2)5PPh2}], [p-C6H4(OCH2C⋮CAu)2{μ-Ph2P(CH2)3PPh2}], and [p-C6H4(OCH2C⋮CAu)2{μ-Ph2P(CH2)5PPh2}] have been characterized by X-ray structure determinations. The ring complexes are emissive at room temperature and may exhibit either red or blue shifts between solution and the solid state.
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