The geometry/shape of the Fe₄ core of the cluster [Fe₄ C(CO)₁₂]²⁻ is · ABC26IN1500
Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Cluster Compounds Wade Rules · Exam: CSIR NET DEC 2019 · Marks: 2 · Difficulty: Easy
The geometry/shape of the $\mathrm{Fe_{4}}$ core of the cluster $\left[\mathrm{Fe}_{4} \mathrm{C}(\mathrm{CO})_{12}\right]^{2-}$ is
(a)tetrahedron
(b)square pyramid
(c)butterfly
(d)trigonal bipyramid
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
[Fe₄C(CO)₁₂]²⁻: 4×8 + 4 + 24 + 2 = 62 = 14n + 6 for n = 4 — two pairs beyond a closo tetrahedron — the open butterfly with the carbide in the hinge.
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