Question #44274

The octahedral complex $\ce{[Fe(phen)2(NCS)2]}$ (where phen = 1,10-phenanthroline) exhibits a thermally induced Spin Crossover (SCO) because its crystal field splitting energy ($\Delta_o$) is approximately equal to the pairing energy ($P$). At $77\text{ K}$, the complex exists in an enthalpy-minimized state, while at $298\text{ K}$, it transitions to an entropy-maximized state. What are the spin-only magnetic moments ($\mu$) of the complex at $77\text{ K}$ and $298\text{ K}$, respectively, and what is the theoretical electronic spin entropy change ($\Delta S_{el}$) for the transition from $77\text{ K}$ to $298\text{ K}$ per mole of the complex?