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copper 1 nitride is a brownish-green colored compound which is used in natural patination of metals. It is used in the green coating on copper statues like The Statue of Liberty and also in decorative paints and powdered dyes. It is fairly soluble in water and has been used as a pigment for green colorants since ancient times. It is also a component of copper (II) sulfate, copper carbonate, and copper chloride.
The oxidation state of Copper depends on the environmental conditions which leads to various patination reactions based on the concentration of Oxygen, Hydrogen, and Nitrogen. When oxygen is present the Oxidation state of copper changes to +1 or +2. The Copper then combines with Oxygen to form copper oxide which in turn reacts with Carbon dioxide to form Copper carbonate (CuCO3). When this happens the surface of the Copper becomes green, this is called Corrosion.
When the oxidation state is changed to +2 the metal is known as Cuprous or Curic. The chemistry of copper 1 nitride is similar to that of the other Cu 1 nitrides which are the yellow and green nitrides.
DFT calculations show that the Cu-on-Cu3N support modulates the partial oxidation state of the catalyst to favor C2+ products over the competing C1 route during CO2 reduction. This effect is attributed to the weak electrostatic interaction between the copper and nitrides. This is the first time that the use of a transition metal nitride has been reported to enhance CO2 reduction to multi-carbon products.