ChemInform Abstract: Anion‐Exchange Reactions of Hydroxy Double Salts.

Abstract

Anion-Exchange Reactions of Hydroxy Double Salts. -Hydroxy double salts (HDS) are prepared by reaction of a solid divalent metal oxide (MeO) with a solution of a divalent metal nitrate M(NO3)2 such as ZnO with M(NO3)2·6 H2O (M: Ni or Co), CuO with Zn(NO3)2·6 H2O, NiO with Cu(NO3)2·H2O. These layered salts of typical compositions ((Me,M)2(OH,NO3)4) and ((Me,M)5(OH)8)(NO3)2 easily exchange anionic surfactants for the interlayer nitrate anions. The anion exchange capacity is due to the exchange of anions in the hydroxide layer as in (Cu2(OH)3NO3) or of anions bound as gegenions of the positively charged hydroxide layer originating from an excess of the divalent metal ions as in (Zn5(OH)8)(NO3)2·2 H2O or Zn5(OH) 8Cl2·H2O. -(MEYN, M.; BENEKE, K.; LAGALY, G.; Inorg.