Osmiamate, potassium

Potassium nitridorhenate, 6 167 Potassium nitridotrisulfate, 2 182 Potassium nitrocarbamate, potassium salt, 1 68, 70 Potassium V-nitrosohydroxylamine-V-sulfonate, 5 117 by metathesis, 6 120 Potassium octacyanomolybdate(IV) 2-hydrate, 3 160 Potassium osmiamate, 6 204... 

Potassium osmiamate, K[Os( VIII )03N], is prepared by the addition of aqueous ammonia to a solution of osmium tetroxide, 0s04, in caustic potash solution (6). X-ray studies show the molecule to be basically... 

Potassium osmiamate forms pale yellow crystals. 

Os(VI) complexes of type [Os(VI)NX5]2- or [0s(VI)NX4H20]-(X = Cl, Br, CN, ox) are made by the action of the appropriate acid HX on potassium osmiamate (6, 11). The tendency to lose the ligand trans to the nitride and to substitute a water molecule is some evidence of a trans labilizing effect of jr-donor ligands. X-ray studies show a distorted octahedral structure with the osmium atom slightly out of the plane of the equatorial X atoms towards the nitride (1). The Os=N stretching frequency is around 1080 cm-1 (11) in such complexes. 

Potassium Osmiamate, OsN03K, may be obtained 3 by the action of ammonia on a cold solution of osmium tetroxide in potassium hydroxide. Thus ... 

The osmiamate ion, Os03N, is isoelectronic with Os04. The yellow potassium salt is the most convenient one to prepare other, less soluble, salts, can be made by metathesis ... 

Reaction with ammonia in aqueous potassium hydroxide yields orange red crystalline osmiamate , K[N=0s03]. 

The osmiamate in is the source of most other osmium nitrido complexes. The free acid is said to be 0sN(0H)02 in the solid state and the Bu"4N, Ph4P+, Pli4As+, lithium, rhodium, potassium, rubidium, cesium, ammonium, silver, thallium, mercury, zinc, barium and lead salts are also known. The preparation of the potassium salt of OSO4 in concentrated KOH solution with NH4OH is a simple method for obtaining this useful starting material. ... 

---