Compartmental ligands. Part 5. Copper(II) complexes of Schiff bases derived from 1-(pyrrol-2-yl)butane-1,3-dione: crystal and molecular structure of [3,11-dimethyl-1,13-bis(pyrrol-2-yl)-7-oxa-4,10-diazatrideca-2,11-diene-1,13-dionato(2–)-N,N′,O,O′]copper(II)

Abstract

Mononuclear copper(II) complexes of acyclic, compartmental Schiff bases derived from 1-(pyrrol2-yl)butane-1,3-dione and alkane-α,ω-diamines have been synthesised. The metal site occupancy has been shown to depend on the length of the alkane bridge. A three-dimensional X-ray crystal structure has been carried out on [3,11-dimethyl-1,13-bis(pyrrol-2-yl)-7-oxa-4,10-diazatrideca-2,11-diene-1,13-dionato(2–)-N,N′,O,O′]copper(II)–chloroform (1/0.5). The complex has Z= 4 in a triclinic cell with space group P and dimensions a= 12.144(4), b= 12.315(7), c= 16.063(8)Å, α= 97.13(4), β= 106.92(4), γ= 100.01(4)°; R= 0.058 for 2 189 reflections.