Synthesis of heteroleptic phosphine–copper(i) complexes: fluorescence sensing and catalytic properties†
*ae
Abstract
Heteroleptic copper(I)–phosphine complexes have attracted considerable attention because of their diverse structures, and photophysical and catalytic properties. In this work, a series of heteroleptic diimine–diphosphine Cu(I) complexes (C1–C10) were synthesized quantitively using the designed bipyridine (L1–L4) and bidentate polyphosphine (L5–L8) as functional ligands. These mixed ligand–copper(I) complexes were fully characterized by 1H and 13C NMR spectroscopy, electrospray ionization mass spectrometry (ESI-MS) and elemental analysis. The detailed structures of complexes C1, C2, C5, C6, C9 and C10 were confirmed by single-crystal X-ray diffraction analysis. Moreover, these phosphine–Cu(I) complexes exhibited intense emissions either in the solid state or in solution under UV light excitation. The emissive complexes C1–C4 displayed highly sensitive luminescence sensing towards silver ions in a quenching fashion (turn-off). Furthermore, all the phosphine-protected copper(I) complexes exhibited high catalytic activity towards azide–alkyne cycloaddition (CuAAC) in water.
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