Espécies moleculares e supramoleculares de 'PD'(II)' com ligantes mono, bi e polidentados : caracterização estrutural e atividades biológicas
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2011-02-09
Autores
Moro, Antonio Carlos [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Os ciclopaladados do tipo [Pd(dmba)(X)L] e [Pd2(dmba)2(μ-L)] (Hdmba = N,N-dimetilbenzilamina; X = haletos ou pseudo-haletos; L = ligantes mono ou bidentados) são compostos estáveis ao ar e empregados em vários estudos biológicos devido a seus potenciais antitumorais. Este trabalho contempla a síntese e caracterização estrutural dos ciclopaladados mononucleares [Pd(dmba)(X)tu] (tu = tiouréia; X = Br (8), I (9)), binucleares [Pd2(dmba)2(X)2(μ-bpp)] (bpp = 1,3-bis(4-piridil)propano; X = Cl (10), Br (11), NCO (12), N3 (13)), e poliméricos [{Pd(dmba)}2{μ-Fe(CN)5NO}]n (14), [{Pd(dmba)}2{μ-Pd(CN)4}]n (15), bem como das espécies [Pd2(Cl)4(PPh3)2(μ-ted)] (16), [Pd2(Br)2(Cl)2(PPh3)2(μ-ted)] (17) e [Pd2(N3)4(PPh3)2(μ-ted)] (18) (PPh3 = trifenilfosfina; ted = trietilenodiamina). As estruturas foram propostas com base em medidas de análise elementar, espectroscopia vibracional na região do infravermelho e espectroscopia de ressonância magnética nuclear. As estruturas de [Pd(dmba)(μ-Br)]2 (4), [Pd(dmba)(Br)tu] (8) e [Pd2(N3)4(PPh3)2(μ-ted)] (18) foram determinadas via difração de raios X por monocristal. Este estudo evidenciou também que as ligações hidrogênio são importantes para direcionar a auto-associação das espécies 8 e 18 durante a cristalização. O comportamento térmico dos compostos 10-12, 14-17 foi investigado por termogravimetria e análise térmica diferencial e os resíduos caracterizados por difração de raios X, método do pó. Além destes, foram sintetizadas as espécies conhecidas [Pd(dmba)(Cl)tu] (6) e [Pd(dmba)(N3)tu] (7), com o intuito de investigar suas atividades biológicas e compará-las com as de outras espécies que apresentam os mesmos ligantes (dmba e tu). As citotoxicidades in vitro dos ciclopaladados e da cisplatina...
Cyclopalladated complexes of the type [Pd(dmba)(X)L] and [Pd2(dmba)2(μ-L)] (Hdmba = N,N-dimethylbenzylamine; X = halides or pseudohalides; L = monodentate or bidentate ligands) are air stable compounds and nowadays employed in several biological studies because of their potential antitumour activities. This research deals with the synthesis and structural characterization of the mononuclear cyclopalladated compounds [Pd(dmba)(X)tu] (tu = thiourea; X = Br (8), I (9)), dinuclear [Pd2(dmba)2(X)2(μ-bpp)] (bpp = 1,3-bis(4-pyridyl)propane); X = Cl (10), Br (11), NCO (12), N3 (13)), and polymers [{Pd(dmba)}2{μ-Fe(CN)5NO}]n (14), [{Pd(dmba)}2{μ-Pd(CN)4}]n (15), as well of the species [Pd2(Cl)4(PPh3)2(μ-ted)] (16), [Pd2(Br)2(Cl)2(PPh3)2(μ-ted)] (17) and [Pd2(N3)4(PPh3)2(μ-ted)] (18) (PPh3 = triphenylphosphine; ted = triethylenediamine). The compounds structures were proposed on the basis of elemental analysis, infrared vibrational spectroscopy and nuclear magnetic resonance spectroscopy. The crystal and molecular structures of [Pd(dmba)(μ-Br)]2 (4), [Pd(dmba)(Br)tu] (8) and [Pd2(N3)4(PPh3)2(μ-ted)] (18) were determined by single-crystal X-ray diffraction measurements. This study also showed that the hydrogen bonds play an important role for directing self-assembly of 8 and 18 species during the crystallization. The thermal behavior of the compounds 10-12, 14-17 was studied by thermogravimetry and differential thermal analysis and the final decomposition products were identified by X-ray powder diffraction. In addition to these compounds, the known ones [Pd(dmba)(Cl)tu] (6) and [Pd(dmba)(N3)tu] (7) were prepared in order to have their biological activities studied and compared with other ones containing the same ligands (dmba and tu). In vitro cytotoxicity assays of cyclopalladated complexes and cisplatin (standard antitumour drug) were carried... (Complete abstract click electronic access below)
Cyclopalladated complexes of the type [Pd(dmba)(X)L] and [Pd2(dmba)2(μ-L)] (Hdmba = N,N-dimethylbenzylamine; X = halides or pseudohalides; L = monodentate or bidentate ligands) are air stable compounds and nowadays employed in several biological studies because of their potential antitumour activities. This research deals with the synthesis and structural characterization of the mononuclear cyclopalladated compounds [Pd(dmba)(X)tu] (tu = thiourea; X = Br (8), I (9)), dinuclear [Pd2(dmba)2(X)2(μ-bpp)] (bpp = 1,3-bis(4-pyridyl)propane); X = Cl (10), Br (11), NCO (12), N3 (13)), and polymers [{Pd(dmba)}2{μ-Fe(CN)5NO}]n (14), [{Pd(dmba)}2{μ-Pd(CN)4}]n (15), as well of the species [Pd2(Cl)4(PPh3)2(μ-ted)] (16), [Pd2(Br)2(Cl)2(PPh3)2(μ-ted)] (17) and [Pd2(N3)4(PPh3)2(μ-ted)] (18) (PPh3 = triphenylphosphine; ted = triethylenediamine). The compounds structures were proposed on the basis of elemental analysis, infrared vibrational spectroscopy and nuclear magnetic resonance spectroscopy. The crystal and molecular structures of [Pd(dmba)(μ-Br)]2 (4), [Pd(dmba)(Br)tu] (8) and [Pd2(N3)4(PPh3)2(μ-ted)] (18) were determined by single-crystal X-ray diffraction measurements. This study also showed that the hydrogen bonds play an important role for directing self-assembly of 8 and 18 species during the crystallization. The thermal behavior of the compounds 10-12, 14-17 was studied by thermogravimetry and differential thermal analysis and the final decomposition products were identified by X-ray powder diffraction. In addition to these compounds, the known ones [Pd(dmba)(Cl)tu] (6) and [Pd(dmba)(N3)tu] (7) were prepared in order to have their biological activities studied and compared with other ones containing the same ligands (dmba and tu). In vitro cytotoxicity assays of cyclopalladated complexes and cisplatin (standard antitumour drug) were carried... (Complete abstract click electronic access below)
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Química inorgânica, Química supramolecular, Supramolecular chemistry, Inorganic chemistry
Como citar
MORO, Antonio Carlos. Espécies moleculares e supramoleculares de 'PD'(II)' com ligantes mono, bi e polidentados : caracterização estrutural e atividades biológicas. 2011. 127 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Química de Araraquara, 2011.