The compound trans–Fe(o–phen)2 (NCS)2 has a magnetic moment of 0.65 Bohr magneton at 80 K, increasing with temperature to 5.2 Bohr magnetons at 300 K.
a. Assuming a spin-only magnetic moment, calculate the number of unpaired electrons at these two temperatures.
b. How can the increase in magnetic moment with temperature be explained? (Hint: There is also a significant change in the UV- visible spectrum with temperature.)
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