THE CRYSTAL-STRUCTURE OF 1,4,8,11-TETRAMETHYL-1,4,8,11-TETRAAZACYCLOTETRA-DECANE NICKEL(II) BISPERCHLORATE AT 155-K

Abstract

The crystal structure of the complex 1, 4, 8, 11-tetramethyl-1,4,8,11-tetraazacyclotetradecane nickel(II) bisperchlorate has been determined by an X-ray diffraction study conducted at 155 K. The monoclinic crystals have the space group Cc with a = 16.960(5), b = 36.651(8), c =18.681(5) Å, β = 112.06° and Z = 20. A combination of Patterson and direct methods were used to solve the structure which was refined by a least squares procedure with R = 0.078 and Rw = 0.079, employing 7242 unique reflections with I ≥ 2.5 σ(I). The asymmetric unit consists of five independent complex nickel cations and ten independent perchlorate anions. Of the five nickel centres, three are well resolved and of these..