Silver acetylide-hexanitrate

Silver acetylide-silver nitrate forms when acetylene is introduced into a neutral or slightly acidic aqueous solution of silver nitrate [5, 13, 31]. The concentration of silver nitrate solution must be lower than 10% wt. because in more concentrated solutions silver acetylide-hexanitrate forms [10, 27, 28]. Silver acetylide-silver nitrate precipitates from the solution in the form of a heavy white powder. Just as in the case of simple silver acetylide, use of unpurified acetylene results in a product with a grayish or brownish tinge [29]. 

Double salt of silver acetylide with six silver nitrate molecules (silver acetylide— hexanitrate) forms rhombohedral crystals if acetylene is introduced into a concentrated solution of silver nitrate (concentration higher than 25%) [28, 39, 40]. The product is very soluble in a solution of silver nitrate (mother liquor) and the solubility increases with the nitrate concentration [27, 28]. 

According to Shaw and Fisher silver acetylide-hexanitrate is, unlike and... 

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