Síntese e caracterização de complexos de estanho com ditiocarbimatos derivados de sulfonamidas, e estudo de sua atividade antifúngica para Colletotrichum gloeosporioides

• Autor(a) principal: Reis, João Paulo Barolli
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2111
• topic: Complexos de estanho (IV); Ditiocarbimatos; Atividade fungicida; Colletotrichum gloeosporioides; Tin complexes(IV); Dithiocarbimates; Fungal activity; Colletotrichum gloeosporioides; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA INORGANICA

This work describes the syntheses of tin(IV) complexes with dithiocarbimates derived from sulfonamides and their characterization by elemental analyses, Mössbauer, infrared, 1H and 13C NMR spectroscopies. Eight complexes of the general formula: [Sn(RSO2N=CS2)3]2- (R = CH3, CH3CH2, CH3(CH2)3, CH3(CH2)7, C6H5, o-CH3C6H4, p-CH3C6H4, p-ClC6H4), were synthesized and isolated as their tetraphenylphosphonium salts. Six complexes of the general formula: [Sn(Bu)2(RSO2N=CS2)2]2- (Bu = Butyl, R = CH3, CH3CH2, CH3(CH2)3, C6H5, p-CH3C6H4, p-ClC6H4), were synthesized and isolated as their tetraphenylphosphonium salts. The three complexes of general formula: [Sn(RSO2N=CS2)3]2- (R = C6H5, p-CH3C6H4 and p-ClC6H4), were also isolated as their tetrabutylammonium salts. Elemental analyses were consistent with the proposed formulae. Spectroscopic data confirmed the coordination of the metal by the two sulfur atoms of the dithiocarbimate anions. Mössbauer spectroscopic data confirmed a distorted octahedral geometry around the tin atom. All the dithiocarbimato potassium salts and their tin(IV) complexes were tested in vitro against Colletotrichum gloeosporioides isolated from infected tissues of papaya. All the compounds were active at 1,00 mmol.L-1 e 2,00 mmol.L-1. The potassium dithiocarbimate containing the R groups CH3, CH3CH2 and C6H5 and the tetraphenylphosphonium salts of their complexes were also tested in the concentrations of 3.00, 4.00 and 5.50 mmol.L-1. The compounds containing the anions [Sn(Bu)2RSO2N=CS2)2]2- were the most active at 4.00 mmol.L-1. Above this concentration no improvement of the activity was observed for any of the compounds.