Skip to main content
Chemistry LibreTexts

A systematic approach to drawing and naming coordination complexes.

  • Page ID
  • For the complex \(K_3[Cr(C_2O_4)_3] \cdot 3H_2O\)

    Q1) What is the central metal ion?

    Q2) What is its oxidation state?

    Q3) What is its electronic configuration?

    Q4) What is its coordination number?

    Q5) What is the shape of the ion?

    Q6) What is the magnetic moment?

    Q7) Can the structure have isomers?

    Q8) Draw one isomer.

    Q9) What is the IUPAC name of the complex?

    For the complex \(K_3[Cr(C_2O_4)_3] \cdot 3H_2O\)

    A1) Central metal is Chromium

    A2) O.S. is III, (Cr(III)

    A3) electronic configuration is d3 (t2g3 eg0)

    A4) C.N. is 6 (3 bidentate ligands present)

    A5) structure is octahedral

    A6) the calculated magnetic moment is 3.89 B.M.
    (based on 3 unpaired electrons)

    A7) Yes, optical isomers are possible

    A8) one isomer is shown below:

    A9) Potassium tris(oxalato)chromate(III) trihydrate
    or Potassium trioxalatochromate(III) trihydrate.


    Prof. Robert J. Lancashire (The Department of Chemistry, University of the West Indies)

    • Was this article helpful?