4AB › Chemistry PYQ › CSIR-NET › June 2017 › Q45Q45 · CSIR-NET Chemistry, June 2017 Paper: CSIR-NET June 2017 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: 18 Electron Rule · Marks: 2 · Difficulty: Medium
The $\mu_{\mathrm{eff}}$ $\left[\mathrm{Fe}(\mathrm{S}_{2}\mathrm{CNEt}_{2})_{3}\right]$ changes with temperature with the involvement of two electronic states. The states are
(a) low spin ${ }^{2} \mathrm{T}_{2 \mathrm{g}}$ and high-spin ${ }^{6} \mathrm{A}_{1 \mathrm{g}}$
(b) low spin ${}^{2}\mathrm{E}_{g}$ and high-spin ${}^{6}\mathrm{A}_{1g}$
(d) low spin ${ }^{2} \mathrm{T}_{2 g}$ and high-spin ${ }^{4} \mathrm{T}_{1 g}$
(c) low spin ${}^{1}\mathrm{A}_{1g}$ and high-spin ${}^{3}\mathrm{T}_{2g}$
Answer Answer: A ✓ checked by 4AB · confidence high
Explanation Fe(III) dithiocarbamates show spin crossover between low-spin t₂g⁵ (²T₂g) and high-spin t₂g³e_g² (⁶A₁g).
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