Silver cyanate
Chemical compound
From Wikipedia, the free encyclopedia
Silver cyanate is the cyanate salt of silver. It is a beige to gray powder.[contradictory]
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| Names | |
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| Systematic IUPAC name
Silver(I) cyanate | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.020.007 |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| AgOCN | |
| Molar mass | 149.885 g/mol |
| Appearance | colourless |
| Density | 4g/cm3 |
| Melting point | 652 °C (1,206 °F; 925 K) |
| Boiling point | 1,085 °C (1,985 °F; 1,358 K) |
| Soluble in ammonia, nitric acid, potassium cyanide, ammonium hydroxide. Insoluble in alcohol and dilute acids.[1] | |
| Hazards | |
| GHS labelling: | |
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| Warning | |
| H302+H312+H332 | |
| P261, P270, P280, P301+P312+P330, P302+P352+P312, P304+P340+P312, P362+P364, P501 | |
| NFPA 704 (fire diamond) | |
| Safety data sheet (SDS) | MSDS |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Structure
Silver cyanate crystallises in the monoclinic crystal system in space group P21/m with parameters a = 547.3 pm, b = 637.2 pm, c = 341.6 pm, and β = 91°. Each unit cell contains two cyanate ions and two silver ions. The silver ions are each equidistant from two nitrogen atoms forming a straight N–Ag–N group. The nitrogen atoms are each coordinated to two silver atoms, so that there are zigzag chains of alternating silver and nitrogen atoms going in the direction of the monoclinic "b" axis, with the cyanate ions perpendicular to that axis.[2]
Preparation
Silver cyanate can be made by the reaction of potassium cyanate with silver nitrate in aqueous solution, from which it precipitates as a solid:
- AgNO3 + KNCO → Ag(NCO) + K+ + NO−3
Alternatively, a reaction with urea, forming ammonium nitrate as a byproduct may be used:
- AgNO3 + CO(NH2)2 → AgNCO + NH4NO3
This is analogous to the reaction used for the industrial production of sodium cyanate.[3]
Reactions
Silver cyanate reacts with nitric acid to form silver nitrate, carbon dioxide, and ammonium nitrate:[4]
- AgNCO + 2 HNO3 + H2O → AgNO3 + CO2 + NH4NO3