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A series of dihydroxamic acid ligands of the formula [RN(OH)C(O)] 2 (CH 2 ) n , (n = 2, 4, 6, 7, 8; R = CH 3 , H) has been studied in 2.0 M aqueous sodium perchlorate at 25.0 °C. These ligands may be considered as synthetic analogs to the siderophore rhodotorulic acid. Acid dissociation constants (pK a ) have been determined for the ligands and for N-methylacetohydroxamic...