Hydration, hydrolysis, and dissociation of a nickel(II) bromide–quinoline complex

Abstract

The tetrahedral complex [NiBr₂(quin)₂](quin = quinoline) will reversibly add two molecules of water or methanol on cooling to ca.–80 °C in chloroform or dichloromethane solution. In the presence of water there is an accompanying slow hydrolysis reaction, but anhydrous solutions maintained at room temperature slowly deposit the polymeric 1 : 1 complex, [{NiBr₂(quin)}_n], previously only obtained by thermal degradation reactions.