Explain the following terms:
(a) coordination number
(b) counter ions.
a) coordination number : The coordination number of a metal ion in a complex can be defined as the number of ligand donor atoms to which the metal is directly bonded. For example, in the complex ions, [PtCl6]-2 and [Ni(NH3)4]2+, the coordination number of Pt and NI are 6 and 4 respectively.
b) Counter ion: The species with in the square bracket are coordination entities or complexes and the ions outside the square bracket are called counter ions.
A coordination compound has the formula CoCl3.4NH3. It does not liberate ammonia but forms a precipitate with AgNO3. Write the structure and IUPAC name of the complex compound.
Write the hybridization and magnetic behaviour of the complex [Ni(CO)4].
(At.no. of Ni = 28)
Which of the following is a more stable complex and why?
(i) [Co(NH3)6]3+
(ii) [Co(en)3]3+
Draw the structure of the following compounds:
(a) cis-[CrCl2(OX)2]3– (b) [Ni(CN)4]2–
(c) [Fe(CN)6]3– (d) Meridional [CrCl3(NH3)3]+
(e) trans-[PtCl2(en)2]2+.
On the basis of crystal field theory, write the electronic configuration for d4 ion if ∆o < P ?
Write the correct formulae for the following coordination compounds:
(a) CrCl3.6H2O (violet, with 3 chloride ions/unit formula)
(b) CrCl3.6H2O (light green, with 2 chloride ion/unit formula)
(c) CrCl3.5H2O (dark green, with 1 chloride ion/unit formula)
Write down the IUPAC name of the following complex:
[Cr(NH3)2Cl2(en)]Cl (en = ethylenediamine)
