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Compare two IR spectrums of [bmim]Br and [bmim]PF6. How are they different? How are they the...

Compare two IR spectrums of [bmim]Br and [bmim]PF6. How are they different? How are they the same?

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The IR spectra of both these ionic liquids will be quite similar except for some characteristics peaks. In the structure of BMIM cation, the carbon atom between two N-centers have the most acidic H-atom due to the electron deficit to the C=N pi-bond. Frequance of (C(2)–H) for [BMIM]PF6 comes near 3110 cm-1 which is around 100 cm-1 blue-shifted from the [BMIM]Br. This difference can be attributed to the weaker hydrogen bonding within the [BMIM]PF6 than the [BMIM]Br.

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