A Tetranuclear Cu<sup>II</sup>-Based 2D Aggregate with an Unprecedented Tetradentate μ<sub>4</sub>-N1,N3,N7,N9-Adeninate Nucleobase
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A unique tetranuclear CuII-based 2D aggregate containing 26-membered CuIIade macrocycles, [Cu4(DMF)6(μ4-ade)2(μ2-Cl)2Cl4]n (1; Hade = adenine, DMF = N,N-dimethylformamide), was isolated by the reaction of CuCl2 and Hade in a mixed DMF−methanol medium and structurally characterized by X-ray crystallography, elemental analysis, Fourier transform infrared, fluorescence spectroscopy, and thermogravimetry−differential thermal analysis techniques. Unexpectedly, the adeninate in 1 represents an unprecedented tetradentate μ4-N1,N3,N7,N9-bridging mode, which significantly contributes to both the aggregate of four CuII cores within the subunit and the extension of the 2D covalent framework. Additionally, 1 displays the intense Hade-based fluorescence emission in solution at room temperature.
