A manganese(Il) cyanide complex has been isolated and its six line epr spectrum

Question

A manganese(Il) cyanide complex has been isolated and its six line epr spectrum due to hyperfine coupling with the 100%abundant 55Mn nucleus with I-5/2 is shown below: a=71 G This complex is believed to have four cyanide ligands, [Mn(CN)4]2. One way to establish this coordination number, is to use a labeled CN, which we could enrich in either 13C or 15N, and both these nuclei are spin ½. Ignore any differences in the cost of the enriched cyanide since you have an unlimited budget. Which isotope would you suggest enriching all the cyanide ligands with and explain your choice. (a) (b) In this thought experiment, what results would you expect to observe after enriching to confirm a coordination number of four? Assuming you actually were to observe what you expect, would it establish a tetrahedral or square planar geometry for this complex?

Explanation / Answer

A manganese(Il) cyanide complex has been isolated and its six line epr spectrum

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