Magnesium cyanide
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| Mg(CN)2 | |
| Molar mass | 76.34 g/mol | 
| Appearance | White solid | 
| Melting point | 500 °C (932 °F; 773 K) (decomposes) | 
| Reacts to form magnesium hydroxide | |
| Solubility in ammonia | Slightly soluble | 
| Related compounds | |
| Other anions | Magnesium thiocyanate | 
| Other cations | Calcium cyanide | 
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references | |
Magnesium cyanide is a chemical compound with the formula Mg(CN)2. It is a toxic white solid. Unlike calcium isocyanide, the cyanide ligands prefer to coordinate at carbon, with a 0.3‑kcal/mol isomerization barrier. When this salt is heated to 500 °C, it decomposes to magnesium nitride.