In the coordination compound [Cr(en)_3]Cl_2, the Cr is octahedrally coordinated. Based on the fact that en is a strong-field ligand, predict whether this compound is diamagnetic or paramagnetic. If it is paramagnetic, tell how many unpaired electrons it has. If it is diamagnetic enter zero. Number unpaired electrons = Determine the d electron configuration of the chromium in this compound. (t_2 g)^n (e_g)^m, n = m = Name this compound.
Expert Answer
Answer
For the compound [Cr(en)3]Cl2, the central metal ion is Cr2+ and the configuration is d4.
For strong field ligand, the compound is paramagnetic. The number of unpaired ligands = 2.
The d electron configuration of Cr is (t2g)4(eg)0. m=4 and n=0
Name of the compound Tris(ethylenediamine)chromium(ii) chloride.