Synthesis and characterization of some dibutylbis{5‐[(E)‐2‐(aryl)‐1‐diazenyl]‐2‐hydroxybenzoato}tin(IV) compounds. Toxicity studies of di‐ and tri‐organotin complexes on the second instar of Aedes aegyptimosquito larvae

The preparation and spectroscopic characterization of some complexes of the type Bu2Sn(LH)2(LH= 5‐[(E)‐2‐(aryl)‐1‐diazenyl]‐2‐hydroxybenzoate) are reported. On the basis of spectroscopic evidence (1H, 13C, 119Sn NMR, IR and 119mSn Mössbauer) the compounds were judged to adopt the usual dicarboxylato structural type with a skew trapezoidal arrangement. This was further confirmed by X‐ray crystallography in the case of Bu2Sn(L5H)2(L5H = 5‐[(E)‐2‐(4‐chlorophenyl)‐1‐diazenyl]‐2‐hydroxybenzoate). Toxicity studies of the di‐ and tri‐organotin compounds on the second larval instar of Aedes aegyptimosquito larvae are reported. Copyright © 2003 John Wiley & Sons, Ltd.