NICKEL(II) 1,10-PHENANTHROLINE COMPLEXES: cis-[AQUA(BROMO)bis(1,10-PHENANTHROLINE)- NICKEL(II)] BROMIDE TRIHYDRATE AND (tris(1,10-PHENANTHROLINE) NICKEL(II)] BROMIDE OCTAHYDRATE

摘要

[Ni(phen)_2(H_2O)Br]Br centre dot 3H_2O where phen is 1,10-phenanthroline, is a light-blue material which crystallizes in the monoclinic space group P2_1/c with Z = 4, a= 10.4300(4), 6 = 25.310(2), c = 9.7790(9)A and beta=102.932(6) deg. The structure was determined at ambient temperature from 5161 reflections with R = 0.0643 and R_2 = 0.1306. The structure consists of a complex cation, a bromide anion and three waters of hydration. The Ni atom is pseudo-octahedral with a cis arrangement of Br and H_2O. This cis geometry persists in solution, as evidenced by ~1H NMR spectroscopy, although the Br may be replaced by another H_2O. [Ni(phen)_3]Br_2 centre dot 8H_2O is a light-red material which crystallizes in the monoclinic space group C2/m with Z= 8, a = 23.6320(111), b = 21.4880(13), c = 15.5410(9) A and p= 107.927(3) deg. The structure was determined at 120K from 6820 reflections with R = 0.0733 and .R_w = 0.1022. The structure consists of a complex cation, two bromide anions and eight waters of hydration. The anions and waters are extensively disordered. The Ni atom is pseudo-octahedral.