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Àý×Ó1£ºProtolitic complexing properties of acylhydrazones of substituted salicylaldehydes and stability constants of their cooper(II) complexes
Àý×Ó2£ºThe herein presented results clearly show that minute water contents, especially in highly lipophilic, nonpolar solvents like hexadecane, can be determined with high sensitivity due to protolitic reaction of 4-methylumbelliferone with water, acting as a base. The emission intensity of deprotonated 4-MU anion well correlates with water contents in the nonpolar solvent. For low concentrations, this system offers higher sensitivity compared to Karl Fischer titration. Moreover, presence of organic acid and especially organic base leads to further increase of sensitivity, with increasing concentration of this additive in the solvent. This effect can be attributed to formation of structures resembling reversed micelle within the low-polarity solvent ¨C with water core and stabilized with protonated (in the case of amine) or deprotonated (in the case of acid) organic ion located at the water ¨C solvent interface. This spontaneous process in the case of added base (amine) supports partition of ionized 4-MU into the minute water phase. Protoliticprotolitic

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