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Cyclopentadienylmolybdenum tricarbonyl, $\ce{MoC8H5O3}$, dimerizes to form the cyclopentadienylmolybednum tricarbonyl dimer, $\ce{(MoC8H5O3)2}$.

$\hspace{3cm}$Cyclopentadienylmolybednum tricarbonyl dimer

How was it discovered that it does this?

If you had an sample of a pure substance, but didn't know if it had dimerized or polymerized, what information would you need to find out if it had?

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  • $\begingroup$ Asking in general, makes it broad-ish - there are various crystallographic, spectroscopic and "traditional" methods, to check out the structure. $\endgroup$ – Mithoron Sep 21 '18 at 21:59
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    $\begingroup$ $\ce{^{95}Mo}$ NMR? $\endgroup$ – A.K. Sep 22 '18 at 19:15
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The suggested answers from the textbook are to look at the output of a mass spectrometer, or to observe the macroscopic crystal structure.

However, NMR spectroscopy is also a perfectly acceptable way to go about it.

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