EXP.2 Preparation of Bis(ethylenediamine)copper(II) Nitrate [Cu(en)2](NO3)2

Reaction Equation: Cu(NO3)2 + 2(en) → [Cu(en)2](NO3O)2 Where en = H2N—CH2—CH2—NH2 Suggested Structure: Coordination no: The shape of the complex:

Reaction Equation: Cu(NO3)2 + 2(en) → [Cu(en)2](NO3O)2 Where en = H2N—CH2—CH2—NH2

Experimental Procedure: 1- Dissolve approximately 6 g of well pulverized Cu(NO3)2⋅3H2O, weighed to the nearest 0.01 g, in 38 ml 95% ethanol in a 250-ml beaker. . 2- Cool the solution in an ice bath for 15 min. . 3- Add, with constant stirring, about 4.0 ml anhydrous ethylenediamine, C2H4(NH2)2, to the ice cold solution (ethylenediamine stinks and is very hard on skin, therefore use under the hood and take care!). 4- Suction-filter off the violet-blue product, using a Büchner funnel

5- Wash the product with 25 -ml portions of ether (CAUTION: ether is very flammable, make certain no open flames are in the vicinity). 6- Weigh the air-dried crystals.

Experimental Calculations: