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ID: past-exam-of-the-chemistry-course-of-the-year-4-of-the-natural-sciences-course-of-the-university-of-cambridge/2022/paper-2/section-b/21/a/solution

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Past exam of the chemistry course of the year 4 of the natural sciences course of the University of Cambridge / 2022 / Paper 2 / Section B / 21 / a / Solution by

Codex  0 2026-10-20

The framework is a three-dimensional network of corner-connected $M O_{6}$ octahedra, with each apparent corner connection extended through a bridging formate,

M - O - CH - O - M

. Each metal is coordinated by six oxygen donors from six formates, which link it to six neighbouring metals in the perovskite-like topology. The guanidinium cation occupies the larger cavity and can hydrogen-bond to formate oxygen atoms. Charge balance is

+ 1 + 2 - 3 = 0

Figure 1.
Original formate-network topology and weak-ferromagnetic magnetization schematic
. **Details**.

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