The use of naphthalene derivatives in inorganic analysis : The effect of substituents in the naphthalene nucleus on the fluorimetric detection of tin

Abstract

Fourteen substituted nitronaphthalene derivatives have been examined as reagents for the fluorimetric detection of tin. The compounds investigated included dinitronaphthalenes, dinitronaphthylamines, halogen substituted mononitronaphthylamines, mononitroso- and dinitro-naphthols and their sulphonic acid derivatives. Four of these reagents have been found to exhibit strong fluorescence and another four to give moderate fluorescence with stannous tin. All reagents are capable of detecting l0 -4 g stannous tin and with four of them, 10 -5 g is capable of detection in 0.01 ml of solution. The results indicate that two of the most important factors relating structure of reagent to intensity of fluorescence are (a) the position of the nitro group in the naphthalene nucleus, i.e., whether it is α- or β- or whether it is sterically hindered and (b) the electropositive or electronegative character of other substituent groups in the reagent