Synthesis, characterization and photophysical properties of PPh2–C2–(C6H4)n–C2–PPh2 based bimetallic Au(i) complexes†
Abstract
A family of the diphosphines PPh2C2(C6H4)nC2PPh2 (n = 0–3), which possess a dialkynyl-arene spacer between the phosphorus atoms, was used for the synthesis of a series of bimetallic gold(I) complexes 1–7. Unlike the corresponding polynuclear Au(I) clusters, which show unique phosphorescence, 1–7 reveal dual emissions consisting of fluorescence and phosphorescence. The results are rationalized, in a semi-quantitative manner, by the trace (1–3) to zero (4–7) contribution of MLCT varying with the number of conjugated