The immune responses are mediated by a variety of cells that, when activated, produce a number of molecules. Macrophages are the first cells to take part in the immune response releasing many compounds in the extracellular environment such as H2O2. Taking into account this aspect we evaluated the activation of an immunological system, in vitro, by determining the H2O2 released in cultures of peritoneal macrophage cells from Swiss mice in the presence of organopalladated compounds of the type [Pd(dmba)(X)(dppp)], dmba = N,N-dimethylbenzylamine, dppp = 1,3-bis(diphenylphosphine)propane, X = Cl, N3, NCO, NCS. An excellent activation of macrophages by the [Pd(dmba)(X)(dppp)] compounds was observed and the influence of the X ligand on the immune response could be verified.

The present paper deals with the bis-insertion reactions of 1,2-diphenylacetylene into Pd-C bond of the cyclopalladated complexes [Pd(dmba)(µ-NCO)]2 (1) and [Pd(dmba)(MeCN)2](NO3) (2) (dmba = N,N-dimethylbenzylamine, MeCN = acetonitrile). Two new complexes [Pd{PhC=CPh-CPh=CPhC6H4CH2N(CH 3)2}(NCO)] (3) and [Pd{PhC=CPh-CPh=CPhC6H4CH2N(CH 3)2}(NO3 )] (4) were obtained and characterized by IR and NMR spectroscopy and elemental analysis.

No presente trabalho é descrita a investigação do comportamento térmico de uma nova série de complexos ciclopaladados, obtidos a partir de reações do azido-complexo [Pd(dmba)(mi-N3)]2 (1) (dmba = N,N-dimetilbenzilamina) com os azo-ligantes aniônicos pirazolato (pz), imidazolato (imz) e 3,5-dimetil-pirazolato (3,5-dmpz). Os compostos binucleares [Pd(dmba)(mi-pz)]2 (2), [Pd(dmba)(mi-imz)]2 (3) e [Pd(dmba)(mi-3,5-dmpz)]2 (4) foram caracterizados por análise elementar, espectroscopia de absorção na região do infravermelho, espectroscopia de RMN de 13C{¹H} e ¹H e análise termogravimétrica. O produto final de decomposição térmica, paládio metálico, foi caracterizado pela difratometria de raios-X, método do pó.

The present paper deals with the thermal behavior study of cyclopalladated complexes obtained from reactions of [Pd(dmba)N3]2 (1), dmba = N,N-dimethylbenzylamine, with azole-compunds, such as, the anionic ligands pyrazolate (pz), imidazolate(imz) and 3,5-dimethyl-pyrazolate (3,5-dmpz). The characterization of the binuclear complexes [Pd(dmba)(mu-pz)]2 (2), [Pd(dmba)(mu-imz)]2 (3) and [Pd(dmba)(mu-3,5-dmpz)]2 (4) was carried out by elemental analysis, IR and NMR spectroscopy. Their thermal behaviour has been investigated and the final product was identified by X-ray powder diffractometry which showed the formation of Pd(0) as final decomposition product.