The matrix model was used to analyze the distribution diagrams and formation functions of ammonia complexes [M(NH3) n ] 2+ (n = 0-4) of Group II metal ions (Mg2+, Ca 2+, Zn2+, Cd2+, and Hg2+) in solution. Intrinsic binding constants of the ligand (K in) and mutual influence corrections (ω) for complex formation with aqua ions in solution were calculated. The equilibrium constants were calculated by the matrix method. The coordination sphere of Mg2+, Ca2+, and Zn2+ by ammonia in a cooperative manner; with Cd2+ and Hg2+, both cooperative and anticooperative binding occur concurrently. Possibilities for differentiation between tetrahedral and square planar coordination polyhedra on the basis of the characteristic features of ligand binding, determined by the matrix model, are discussed.
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