Syntheses and characterization of luminescent dinuclear and polynuclear Cu(I) complexes containing 4,4′-bis(diphenylphosphino)biphenylene bridge

The dinuclear complex [Cu2(dpbp)2(NCMe)4][BF4]2 (1) has been prepared by treating [Cu(NCMe)4][BF4] with 4,4′-bis(diphenylphosphino)biphenylene (abbreviated as dpbp). Reactions of 1 with 2,2′-bipyridine and 1,1′-bis(diphenylphosphino)ferrocene (abbreviated as dppf) afford [Cu2(dpbp)2(2,2′-bipy)2][BF4]2 (2) and [Cu2(dpbp)(dppf)2][BF4]2 (3), respectively. In contrast, compound 1 reacts with tetra(2-pyridyl)ethyl-1,4-diaminobutane (abbreviated as tpyda) to produce the polymeric complex {[Cu2(dpbp)(tpyda)][BF4]2}n (4). Compounds 1–4 are photoluminescent with the emission band (λmax) in the range 510–554 nm. The crystal structures of 1 and 4 have been determined by an X-ray diffraction study.