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Inorganic cyanides contain the group (CN)-; a general formula may be MeCN.
Column chromatography does separate polar compounds. Use EtOAc : MeCN : MeOH : water (relative volumes, not percentages) 60 : 20 : 20 : 20 60 : 15 : 15 : 15 60 : 10 : 10 : 10 70 : 10 : 5 : 5 70 : 5 : 2.5 : 2.5 70 : 2.5 : 1.25 : 1.25 If streaking occurs, or if you are trying to purify an acid with limited solubility in these systems, it sometimes helps to add 0.5% triethylamine. Reference: external link