Concentration dependence of lH n.m.r. spectra appears to have been made to correlate this concentration suggests that benzylpenicillin ions aggregate in aqueous dependence with association properties of penicillins. solution primarily through hydrophobic interactions of Controversial reports have been made regarding the state the benzyl side chains.of penicillin salts in aqueous solutions ; on the one hand they are said to behave as simple 1 : 1 electrolytes;% and on the other, to behave as colloidal electrolytes and to form micellar aggregate^.^,^ We report a 1H n.m.r. study that ALTHOUGH n.m.r. spectra of aqueous solutions of penicillins are known to be concentration dependent,l no attempt
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