STUDIES ON THE BASIC CARBONATES OF NICKEL Part VII: Formation and Configurations of Basic Nickel Carbonates

Abstract

A mechanism for the formation of basic nickel carbonates has been given on thebasisof the hydrolysis of [Ni(H2O)B]+ + cation and the olation of the resulting species into aggregates of various polynuclear units. The resulting configurations basedon coordination number 4 for nickel, are supported by the nature of the water molecules involved, the coordinated water molecules being lost in the first stage of the decomposition and hydroxyl water and carbondioxide during the second stage. At higher temperatures, the 01 bridges are partly replaced in the precipitates by 0x0 bridges and also by carbonate bridges. Possible methods whereby the different species of basic nickel carbonates form three-dimensional aggregates have been given and evidence for the same obtained from determination of surface areas of the basic carbonates and their decomposition products.