Abstract
Two copper(I) iodide compounds with formula of {[Cu2I2(2-mna)]·DMA} (1) and {[CuI(6-mna)]·DMSO} (2) (2-mna = 2‑mercaptonanicotinic acid; 6-mna = 6‑mercaptonanicotinic acid; DMA = dimethylacetamide; DMSO = dimethyl sulfoxide) have been prepared by reaction and evaporation between CuI and 2-mna/6-mna at room temperature. Four Cu atoms in 1 are linked by I− ions and 2-mna ligands into [Cu4I4(2-mna)2] units which are further linked into a 1D inorganic-organic chain by sharing CuI bonds. In 2, thiolate sulfur of 6-mna adopts μ2-coordination modes to bridge two Cu atoms, forming [Cu2(6-mna)2] building units, which are further connected by I− ions into 1D chain structure. It is worth mentioning that the Cu⋯Cu distances in 1 and 2 are shorter than the sum of the van der Waals radii of copper(I) (2.80 Å), implying the metal-metal bonding interactions. Interestingly, compounds 1 and 2 display blue and red fluorescence emission bands in the solid state, respectively. In particular, compound 2 exhibits the capability to selectively detect Fe3+ ion as a fluorescence “turn-off” sensor.
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