Synthesis, structure and spectroscopic properties of [Cu3(μ-dpnapy)3-(CH3CN)][ClO4]3·CH3CN(dpnapy = 7-diphenylphosphino-2,4-dimethyl-1,8-naphthyridine) with a linear copper atom array

Abstract

The co-ordination chemistry of 7-diphenylphosphino-2,4-dimethyl-1,8-naphthyridine (dpnapy) with Cu I has been examined. Reaction of [Cu(CH 3CN) 4][ClO 4] with dpnapy in CH 3CN afforded [Cu 3(μ-dpnapy) 3(CH 3CN)][ClO 4] 3 1[ClO 4] 3. The crystal structure of 1[ClO 4] 3·CH 3CN reveals a linear Cu-Cu-Cu array with both trigonal and tetrahedral co-ordination modes for the copper atoms. The intramolecular Cu-Cu distances of 2.449(2) and 2.721(2) Å suggest that only two of the copper atoms have a bonding interaction. Complex 1 reacts with triphenylphosphine (PPh 3) and 2,2′-bipyridine (bpy) to give [Cu(bpy)(dpnapy) 2][ClO 4] 2[ClO 4] and [Cu 2(μ-dpnapy) 3][ClO 4] 2 3[ClO 4] 2, respectively. Spectroscopic properties of the complexes have been examined.