Synthesis, structure and fungicidal activity of organotin 2-(3-pyridylmethylthio)benzoate and (2-pyridylthio)acetate

Three dimeric complexes {[2-(3-PyCH2S)C6H4CO2SnR2](2)O}(2) and {[(2-PySCH2CO2)SnR2](2)O}(2) (Py=pyridyl) as well as two monomeric complexes (2-PySCH,CO2)SnPh3 and [2-(3-PyCH2S)CH4CO2]SnPh3 have been synthesized by the reaction of 2-(3-pyridylmethylthio)benzoic acid or (2-pyridylthio)acetic acid with R2SnO (R=Et or Bu-n) and (Ph3Sn)(2)O. Their structures have also been confirmed by X-ray single crystal diffraction. Preliminary in vitro tests for fungicidal activity show that complexes {[(2-PySCH2CO2)SnBu ''(2)](2)O}(2) and [2-(3-PyCH2S)C6H4CO2]SnPh3 display high activity to Colletotrichum lagenarium, Cercospora arachidicola and Physolospora piricola in a low concentration. CCDC: 685778, 2; 685777, 4.