Abstract
Sulphur homocycles up to S25 can be separated on C8 and C18 bonded phases using methanol/water eluents. For rings larger than about S15 methanol-alkane eluents should be used. In 100% MeOH the retention of S-rings is larger than that of alkanes having the same molecular surface area, which can be explained by an additional interaction of the alkanes with the methyl groups of the eluent. If water is added to the eluent, the sulphur and alkane retentions approach each other. The heat of sorption of S-rings and alkanes are more negative the higher the eluent water content. The sorption entropies are mostly negative which indicates the existence of a highly ordered “sorbed complex” which is thought to consist of bonded phase, sorbed solutes and eluent molecules.
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