Ammonium bis(sulfamato) chlorocuprate

Formula: (NH4)2[Cu(SO3NH2)2Cl2]

Ammonium bis(sulfamato) chlorocuprate

An unusual coordination complex of copper, producing dark blue crystals.

Similar compounds: + Potassium bis(sulfamato) chlorocuprate, K2[Cu(SO3NH2)2Cl2]. + Potassium bis(sulfamato) bromocuprate, K2[Cu(SO3NH2)2Br2].


  • Color: dark blue, almost black
  • Crystal shape: tabular, flat
  • Stability on air: stable


Preparation is essentially the same as of the potassium analog, with potassium replaced by ammonium. However, there is a complication: a solution containing stoichiometric mixture of [NH4]+, Cu2+, Cl-, NH2SO3- ions does not produce the desired compound upon crystallization. Instead, light blue crystals of ammonium tetrachlorocuprate appear. This can be solved by adding excess of copper sulfamate.


All copper compounds are moderately toxic.

More photos

Ammonium bis(sulfamato) chlorocuprate

Ammonium bis(sulfamato) chlorocuprate