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Atomically Defined Monocarborane Copper(I) Acetylides with Structural and Luminescence Properties Tuned by Ligand
Kang Zhang1, Yunjun Shen1, Xiaoli Yang1
1Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027, Hangzhou, P. R. China.
Abstract:
The weakly coordinating cluster [CB11 H12 ]- is used as a versatile building block for the preparation of luminescent copper(I) complexes. Treatment of [CB11 H11 -12-C≡CH]- with CuI and ammonia affords {(CB11 H11 -12-C≡C)2 Cu4 (NH3 )3 }n (2). Addition of selected phosphine and pyridine ligands transforms 2 to a range of homometallic products 3-13. All compounds have been characterized by X-ray crystallography, which reveals a surprising variety of structural complexity featuring cores with two to ten Cu+ centers. In the solid state, products 3-13 exhibit room-temperature phosphorescence across the visible spectrum in colors from blue to deep red. Lifetimes at room temperature are in the microsecond regime, and quantum yields of up to Φ=0.99 are observed.
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