The basic salts of this system were prepared and their structures and physico-chemical properties were studies by electron microscopy, chemical analysis, X-ray powder diffraction, thermal analysis, i.r. absorption spectra, BET absorption, and acidity-basicity measurements. The salts were found to be new compounds analogous to hydrotalcite. They can be expressed by the formula; [M
 2+
 M
 3+
 (OH)2(x+y))]y+ [A
 1
 −
 , Az2- · mH2O]-(z1 + 2z2) where M2+ and M3+ denote di- and trivalent cations, A− and A2− denote mono- and divalent anions, respectively, and y = z1 + 2z2; z1 ≫ z2. The structures consist of positively charged Cd(OH)2-like basic layers and intermediate layers formed from anions and water molecules with the solid solution of divalent cation (M2+) and trivalent cation (M3+) being formed in the range of 0.6 > x/(x + y) > 0.9. The anions of Cl−, NO
 3
 −
 and ClO
 4
 −
 are easily substituted by CO
 3
 2−
 . A large part of the NO
 3
 −
 makes a monodentate-type bond and the ClO
 4
 −
 a bridge-type bond.

The Syntheses of Hydrotalcite-Like Compounds and Their Structures and Physico-Chemical Properties I: The Systems Mg2+-Al3+-NO3-, Mg2+-Al3+-Cl-, Mg2+-Al3+-ClO4-, Ni2+-Al3+-Cl- and Zn2+-Al3+-Cl-

Infrared spectroscopic identification of species arising from reactive adsorption of carbon oxides on metal oxide surfaces

The Synthesis and Ion Bindings of Synthetic Multidentate Macrocyclic Compounds.

Macrocyclic coordination compounds formed by condensation of metal-amine complexes with aliphatic carbonyl compounds

Metal complexes of aromatic amine n-oxides

Some Nitrato-Amine Nickel(II) Compounds with Monodentate and Bidentate Nitrate Ions

Addition of cyanide to aqueous solutions of some copper(II) and nickel(II) tetramine complexes causes an immediate colour change, from mauve to blue for the copper compounds and orange to pink for the nickel compounds, these colours then slowly fading to colourless [Cu(CN)4]3- and pale yellow [Ni(CN)4]2- respectively as the amine complexes decompose. Spectrophotometric studies on the solutions indicate that the immediate colour change is caused by the formation of a monocyanide adduct, the formation constant being of the order of 102 for the copper(II) compounds and 10 for the nickel(II) compound studied. Measurements of the absorption spectrum and magnetic susceptibility show that the nickel(II) cyanide adduct has a triplet ground state.

N. F. Curtis

Papers

Some Nitrato-Amine Nickel(II) Compounds with Monodentate and Bidentate Nitrate Ions

Some copper(II) and nickel(II) amine-cyanide derivatives. I. Solution equilibria