Abstract
Spectrophotometry was employed to study the aggregation of Mordant Black 11 (MB-11) in aqueous solution. The aggregation number and constant were determined using the maximum slope method. The aggregation characteristics obtained by this method were then compared with other methods. In addition, the spectral change as a result of dimerization of MB-11 was interpreted in terms of the usual cluster model of water exerting hydrophobic interaction around the dye ions.
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