# For "pentamminechlorochromium(III+) nitrate"...can you...?

## $\text{a. Give the d-electron count at the transition metal centre.}$ $\text{b. Predict the spin state of the d-electrons.}$ $\text{c. Identify the outer sphere ions?}$ $\text{d. Predict whether the complex is paramagnetic,}$ $\text{e. Give a possible coordination sphere isomer.}$

Jan 8, 2016

We start with a $C {r}^{3 +}$ metal ion, that is surrounded by (coordinated to) 6 ligands in an octahedral array, to give ${\left[C r {\left(N {H}_{3}\right)}_{5} C l\right]}^{2 +} {\left(N {O}_{3}^{-}\right)}_{2}$
a. The transition metal ion $C {r}^{3 +}$ has a ${d}^{3}$ electron count at the metal centre.
b. These ${d}^{3}$ electrons are all unpaired.
e. For a coordination sphere isomer, simply replace one of the octahedrally coordinate ligands (ammine or chloro) with the counter ion, nitrato: i.e. ${\left[C r {\left(N {H}_{3}\right)}_{5} \left(N {O}_{3}\right)\right]}^{2 +}$.