“…The coordination polyhedra are often classified as trigonal, tetrahedral, trigonal bipyramidal or References: 1, Hg(CI,Br)2 (Scholten & Bijvoet, 1941); 2, CH3CN.3HgBr2 (Leligny, Frey & Monier, 1972); 3, C4HsO.HgBr2 (Frey, Leligny & Ledrsert, 1971); 4, KHgBrzCN.2H20 (Brodersen & Frohring, 1981); 5, HgBr2 (Braekken, 1932); 6, T14HgBr6 (Brodersen, Thiele & G6rz, 1973); 7, Hg2Br2 (Ewald & Hermann, 1931). octahedral and are mostly described as heavily distorted.…”