# How do we know cyclopentadienylmolybdenum tricarbonyl occurs as a dimer?

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

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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?

• Asking in general, makes it broad-ish - there are various crystallographic, spectroscopic and "traditional" methods, to check out the structure. Sep 21 '18 at 21:59
• $\ce{^{95}Mo}$ NMR?
– A.K.
Sep 22 '18 at 19:15