Question

Using the ligand ethylenediamine indicate and draw the structures of the possible complexes synthesized from CuSO_{4 *} 5H₂O

Answer 1

CuSO4 .H2O occurs as a aqua complex of the form [Cu(H2O)5]SO4

with ethylene diammine it can form chelate by stepwise displacement of H2O molecules

[Cu(H2O)5]²⁺ + H2NCH2CH2NH2 [Cu(H2O)4 en]²⁺ +H2O

[Cu(H2O)4 en]²⁺ + en[Cu(H2O)2 (en)2]²⁺ + 2H2O

[Cu(H2O)2 (en)2]²⁺ + en [Cu (en)3]²⁺ + 2H2O

                                         (very unstable)

[Cu(H2O)2 (en)2]²⁺ cis form

[Cu (en)3]²⁺ highly strained ring