In coordination chemistry there are a variety of methods applied to find out the structure of complexes. One method involves treating the complex with known reagents and from the nature of reaction, the formula of the complex can be predicted. An isomer of the complex Co(en) 2 (H 2 O)Cl 2 Br, on reaction with concentrated H 2 SO 4 (dehydrating agent) it suffers loss in weight and on reaction with AgNO 3 solution it gives a white precipitate which is soluble in NH 3 (aq).
(i) The correct formula of the complex is :
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(i) Water present in ionisation sphere is absorbed by conc. H 2 SO 4 (dehydrating agent). If Cl – present as counter ion then reacts with, AgNO 3 to give white precipitate of AgCl.
(ii) With F – ligand, metal ion has electron configuration, t 2g 2, 1, 1 e g 1,1 .
So, μ = 
≈ 4.9 BM; where n = number of unpaired electrons.
(iii) With NO 2 ¯ ligand, electron configuration in crystal field splitting for Co 3+ will be t 2g 2,2,2 e g 0 i.e. no unpaired electrons.
(iv) Complex contains one Cl – as counter ion.
One mole of complex = one mole of Cl –
As two mole of Cl – gives one mole of PbCl 2 .
∴ One mole of Cl – will give ½mole of PbCl 2 .
(v) Only two geometrical isomers are possible of [CoBrCl(en) 2 ] + .
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