Do you know inorganic substances with refractive index > 4.5 ?
OR - what is the maximum refractive index of ANY chemical substance you know ? ( Ge has refractive index 4.0-4.07 - the highest I could find ).
By using FTIR-ATR-method (IRE - diamond n=2.4) in order to study the reaction between two simple substances dissolved in water - we observed several peaks with negative absorbance - substantially intensifying in the course of reaction. [The strongest among negative peaks lies at 1740 cm-1 the frequency typical for esters, BUT - there are no groups in the reaction mixture which can form any type of carbonyl groups]
Depends on the wavelength obviously. I think a little search may find the odd metal at a particular wavelength with a RI higher than 4.0 Again for some III-V or II-VI compounds. You have carbon and oxygen in the system - so you can form carbonyl groups.
Try 38.6....:
http://physicsworld.com/cws/article/news/2011/feb/16/metamaterial-breaks-refraction-record
At 10 microns Au has an RI of 12.1 and it increases as the wavelength increases. At 286 um, it's stated to be 447....
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