Synthesis and Characterization of New Palladium(II) Complexes Containing N-Alkylamino-3,5-diphenylpyrazole Ligands. Crystal Structure of [PdCl(L2)](BF4) {L2 = Bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine}

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doi:10.1071/CH08521

Synthesis and Characterization of New Palladium(ii) Complexes Containing N-Alkylamino-3,5-diphenylpyrazole Ligands. Crystal Structure of [PdCl(L2)](BF₄) {L2 = Bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine}

Gemma Aragay ^A, Josefina Pons ^A ^D, Jordi García-Antón ^A, Ángeles Mendoza ^A ^B, Guillermo Mendoza-Díaz ^B, Teresa Calvet ^C, Mercè Font-Bardia ^C, Josep Ros ^A

^A Departament de Química, Unitat de Química Inorgànica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
^B Facultad de Química, Universidad de Guanajuato, 36050 Guanajuato, Mexico.
^C Cristal.lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain.
^D Corresponding author. Email: Josefina.Pons@uab.es





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Australian Journal of Chemistry 62(5) 475–482 http://dx.doi.org/10.1071/CH08521
Submitted: 27 November 2008 Accepted: 20 January 2009 Published online: 15 May 2009

Abstract

In this paper, the synthesis of two new N,N′,N-ligands, bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]amine (L1) and bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine (L2) is reported. These ligands form complexes with the formula [PdCl(N,N′,N)]Cl when reacting with [PdCl₂(CH₃CN)₂] in a 1:1 metal-to-ligand molar ratio. Treatment of these ligands with [PdCl₂(CH₃CN)₂] in a 1:1 metal-to-ligand molar ratio in the presence of AgBF₄ or NaBF₄ gave [PdCl(N,N′,N)](BF₄) complexes. These Pd^II complexes were characterized by elemental analyses, conductivity measurements, mass spectrometry, and IR, ¹H, and ¹³C{¹H} NMR spectroscopies. The X-ray structure of the complex [PdCl(L2)](BF₄) has been determined. The metal atom is coordinated by two azine nitrogen atoms and one amine nitrogen atom of the aminopyrazole ligand. The distorted square planar coordination is completed by one chlorine atom. In this complex, intermolecular π–π stacking interactions are present.