Crystal structure of aqua-bis{(1,10-phenanthroline)-[(E)-5-bromo-2- oxidobenzylideneamino]ethanesulfonato}dinickel(II) – ethanol (1:1), Nì 2 (H 2 O)(C 12 H 8 N 2 ) 2 (C 9 H 10 BrN0 5 S) 2 · C 2 H 5 OH