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Abstract  

The dimeric compound [Pd(bzan)(μ-OOCCH3)]2 (1) (bzan=N-benzylideneaniline) reacts with KX, in methanol/acetone (2:1), affording the analogous dimeric pseudohalogen-bridged species [Pd(bzan)(μ-X)]2 [X=NCO(2),SCN(3), CN(4)]. The compounds were characterized by elemental analysis, infrared spectroscopy, NMR and thermogravimetric analysis. IR data for 2–4 showed bands typical of coordinated pseudohalogen ligands clearly indicating the occurrence of the exchange reaction. Their thermal behaviour was investigated and suggested that their stability is influenced by the bridging ligand. The thermal stability decreased in the order[Pd(bzan)(μ-CN)]2>[Pd(bzan)(μ-SCN)]2>[Pd(bzan)(μ-OOCCH3)]2>[Pd(bzan)(μ-NCO)]2. X-ray results showed the formation of Pd as final decomposition product.

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Abstract  

Synthesis, spectroscopic characterization and thermal analysis of the [Pd(dmba)(Cl)(iso)] (1), [Pd(dmba)(NCO)(iso)] (2), [Pd(dmba)(N3)(iso)] (3) and [Pd(dmba)(Br)(iso)] (4) (dmba = N,N′-dimethylbenzylamine; iso = isonicotinamide) compounds are described in this work. The complexes were investigated by infrared spectroscopy (IR), differential thermal analysis (DTA) and thermogravimetry (TG) and the residues of the thermal decomposition were identified as Pdo by X-ray powder diffraction. The thermal stability order of the complexes varied as [Pd(dmba)(Cl)(iso)] (1) > [Pd(dmba)(Br)(iso)] (4) > [Pd(dmba)(NCO)(iso)] (2) > [Pd(dmba)(N3)(iso)] (3).

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Thermal study of cyclopalladated complexes of the type [Pd2(dmba)2X2(bpe)]

(X=NO- 3, Cl-, N- 3, NCO-, NCS-; bpe=trans-1,2-bis(4-pyridyl)ethylene)

Journal of Thermal Analysis and Calorimetry
Authors: E. T. de Almeida, A. M. Santana, A. V. G. Netto, Claudia Torres, and A. E. Mauro

The synthesis, characterization and thermal analysis of the novel cyclometallated compounds [Pd2(dmba)2Cl2(μ-bpe)] (1), [Pd2(dmba)2(N3)2(μ-bpe)] (2), [Pd2(dmba)2(NCO)2(μ-bpe)] (3), [Pd2(dmba)2(SCN)2(μ-bpe)] (4), [Pd2(dmba)2(NO3)2(μ-bpe)] (5) (bpe=trans-1,2-bis(4-pyridyl)ethylene; dmba=N,N-dimethylbenzylamine) are described. The thermal stability of [Pd2(dmba)2X2(μ-bpe)] complexes varies in the sequence 1>4>3>2>5. The final residues of the thermal decompositions were characterized as metallic palladium by X-ray powder diffraction.

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Mono and dinuclear Pd(II) complexes with pyrazole and imidazole-type ligands

Synthesis, characterization and thermal behaviour

Journal of Thermal Analysis and Calorimetry
Authors: V. Lucca Neto, A. Mauro, A. Netto, A. Moro, and V. Nogueira

Abstract  

The cyanate-bridged cyclopalladated compound [Pd(C2,N-dmba)(μ-NCO)]2 (dmba=N,N-dimethylbenzylamine) reacts in acetone with pyrazole (pz), 3,5-dimethylpyrazole (dmpz), imidazole (imz) and 2-methylimidazole (mimz) to give [Pd2(C2,N-dmba)2(μ-NCO)(μ-pz)] (1), [Pd2(C2,N-dmba)2(μ-NCO)(μ-dmpz)] (2), [Pd(C2,N-dmba)(NCO)(imz)] (3) and [Pd(C2,N-dmba)(NCO)(mimz)] (4), respectively. The compounds were characterized by elemental analysis, IR spectroscopy and TG. The thermal decomposition of the compounds occurs in three consecutive steps and the final decomposition products were identified as Pd(0) by X-ray powder diffraction. The thermal stability order of the complexes is 2>3>1>4.

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Journal of Thermal Analysis and Calorimetry
Authors: Sahra C. Lemos, Silmar J. S. Franchi, Adelino V. G. Netto, Antonio E. Mauro, Oswaldo Treu-Filho, Regina C. G. Frem, Eduardo Tonon de Almeida, and Cláudia Torres

Introduction Cyclopalladated complexes represent an important branch in modern organometallic chemistry since they play important roles not only in organic synthesis [ 1 ], photochemistry [ 2 ], and homogeneous catalysis [ 3

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, Hörner , M 2009 Antitumor and antimycobacterial activities of cyclopalladated complexes: X-ray structure of [Pd(C 2 ,N-dmba)(Br)(tu)] (dmba = N,N-dimethylbenzylamine, tu = thiourea) . Eur J Med Chem 44 : 4611 – 4615 10.1016/j.ejmech.2009

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Journal of Thermal Analysis and Calorimetry
Authors: Francisco C. C. Arantes, Antonio C. Moro, Iolanda S. Klein, Cristiana da Silva, Adelino V. G. Netto, Antonio E. Mauro, and Vânia M. Nogueira

-40422006000400022 . 2. Moro , AC , Mauro , AE , Netto , AVG , Ananias , SR , Quilles , MB , Carlos , IZ et al. 2009 Antitumor and antimycobacterial activities of cyclopalladated complexes: X-ray structure of [Pd(C2, N

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New palladium(II) complexes with pyrazole ligands

Part I. Synthesis, spectral and thermal studies, and antitumor evaluation

Journal of Thermal Analysis and Calorimetry
Authors: Carolina V. Barra, Fillipe V. Rocha, Adelino V. G. Netto, B. Shimura, Regina C. G. Frem, Antonio E. Mauro, Iracilda Z. Carlos, Sandra R. Ananias, and Marcela B. Quilles

cyclopalladated complex, [PdCl(C 37 H 32 N)] . Acta Crystallogr C. 50 : 1872 – 1873 . 10.1107/S0108270194006475 . 15. Zukerman-Schpector , J , Castellano , EE , De Simone , CA , Oliva , G

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New palladium(II) complexes with pyrazole ligands

Part II. Synthesis, spectral and thermal studies, and antitumor evaluation

Journal of Thermal Analysis and Calorimetry
Authors: Carolina V. Barra, Fillipe V. Rocha, Adelino V. G. Netto, Regina C. G. Frem, Antonio E. Mauro, Iracilda Z. Carlos, Sandra R. Ananias, and Marcela B. Quilles

, ET , Santana , AM , Netto , AVG , Torres , C , Mauro , AE . 2005 Thermal study of cyclopalladated complexes of the type [Pd 2 (dmba)2X2(bpe)] (X=NO 3 − , Cl − , N 3 − , NCO − , NCS − ; bpe=trans-1,2-bis(4-pyridyl)ethylene) . J Therm Anal

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Journal of Thermal Analysis and Calorimetry
Authors: Fillipe V. Rocha, Carolina V. Barra, Silmar J. S. Franchi, Adelino V. G. Netto, Antonio E. Mauro, and Regina C. G. Frem

, AM , Netto , AVG , Torres , C , Mauro , AE 2005 Thermal study of cyclopalladated complexes of the type [Pd 2 (dmba) 2 X 2 (bpe)] . J Therm Anal Calorim 82 : 361 – 364 10.1007/s10973-005-0903-3 . 13

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