The Preparation, Substantivity, and Fluorescence Intensity of some Benzoyl Derivatives of 4, 4‘–Diaminostilbene–3, 3’– and –2, 2 –Disulphonic Acids

The benzoyl, p–toluoyl, and p–aminobenzoyl derivatives of 4, 4′‐diaminostilbene‐3, 3′‐and‐2, 2′‐sulphonic acid have been prepared. Their substantivities (under equilibrium adsorption conditions) and fluorescence intensities have been compared. The 3, 3′‐derivatives have greater substantivity and, although this is not quite so marked, higher fluorescence intensity for the same amount adsorbed than the 2, 2′‐derivatives.