Quantitative separation of halonitrobenzenes, anisoles and toluenes was studied on polyethyleneglycol, polyethyleneglycol succinate, polyoxyethylenesorbitan monostearate, silicone oil and squalane as liquid phases. The interactions and forces that affected the separation of the isomers and their elution sequences were discussed. It was found that polyethyleneglycol succinate and polyoxyethylenesorbitan monostearate could selectively separate all the isomers studied. INTROI>UCTLON The separation and study of the dichlorobenzene isomers were presented in Part I (ref. I). The present work concerns the study of fluoro-, chloro-, and bromonitrobenzenes, fluoro-, chloro-, bromo-, and nitroanisoles, and fluoro-, chloro-, bromo-, iodo-, cyano-, and nitrotoluenes. HABBOUSH AND NORMAN~ recorded the retention data for nineteen sets of o-, m-, and $-isomers on Apiezon L, dinonyl phthalate, polyethyleneglycol-stearic acid, tritolyl phosphate, 2,4,7-trinifirofluorenone and silicone gum rubber. Nitrotoluenes were resolved by NORMANS on 2,4,7-trinitrofluorenone, by COURTIER et aZ.* on cyanated silicone oil, and by PARSON et al.5 using Apiezon L, BOMBAUGH~ examined chloronitrobenzene on Carbowax (1000) and other liquid phases. RATUSKY AND BASTER' studied chloronitrotcnzenes, nitroanisoles and other solutes on r,2,3,4-tetrakis(z-cyanoethoxy)butane.
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Most of the reported work did not discuss mechanisms for the separations and interactions involved, but few suggestions for the efficiencies of some systems were given. General quantitative separations and mechanisms of interactions for the isomers dealt with in this study are not available.
The selectivity of stationary liquid phases was studied by several workers+13, and others?*-20 discussed the role of stationary phases in gas-liquid chromatography (GLC), aiming to evaluate quantitatively the interactions of the solutes with liquid J, Chromatog.,