Síntese, caracterização e atividade antifúngica de complexos de estanho(IV) com ditiocarbimatos e dimetilestanho

• Autor(a) principal: Miranda, Liany Divina Lima
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2132
• topic: Síntese; Caracterização; Atividade antifúngica de complexos de estanho; Synthesis; Characterization; Antifungal activity of tin(IV); CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA INORGANICA

This work involved the synthesis of ten new tin compounds derived from sulfonildithiocarbimates, being five anionic complexes and five neutral complexes. The anionic complexes (Ph4P)2[Sn(CH3)2(RSO2N=CS2)2] (Ph4P = tetraphenylphosphonium, R = phenyl, 4-fluorophenyl, 4-chlorophenyl, 2- methylphenyl, 4- methylphenyl) were obtained by the reaction of the dithiocarbimates with dichlorodimethyltin(IV) and tetraphenylphosphonium chloride in water in 2:1:2 molar ratio. The neutral complexes [Sn(CH3)2(RSO2N=CS2)] (R = phenyl, 4-fluorophenyl, 4-chlorophenyl, 2-methylphenyl, 4- methylphenyl) were obtained by the reaction of the dithiocarbimates with dichlorodimethyltin(IV) in water in 1:1 molar ratio. The elemental analyses (CHN), vibrational spectra, 1H, 13C and 119Sn Nuclear Magnetic Ressonance spectra and Mössbauer 119Sn data were consistent with the proposed formulae. X-ray diffraction experiments for the compounds (Ph4P)2[Sn(CH3)2(4-FC6H4SO2N=CS2)2] and (Ph4P)2[Sn(CH3)2(4- ClC6H4SO2N=CS2)2] showed that two dithiocarbimate anions and two methyl groups are coordinated to the tin atom forming a distorted octahedral geometry. The ditiocarbimate anions are coordinated to the metal by sulfur and nitrogen atoms. The antifungal activity of the complexes were tested in vitro against Fusarium solani, the causal agent of wilt and root rot in a number of crops including cotton, peas, ornamentals, fruits and cucurbits. All complexes were active, but less active than the commercial fungicide bis(diethyldithiocarbamato)zinc(II).