Pd(II) and Pt(II) Coordination Chemistry with Hybrid Pyridine-Pyrazole Ligands: from 3D-Frameworks Structures in Molecular Complexes

Miguel Guerrero; José A. Pérez; Teresa Calvet; Mercè Font-Bardía; Josefina Pons

doi:10.1071/CH13021

RESEARCH ARTICLE

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Pd(II) and Pt(II) Coordination Chemistry with Hybrid Pyridine-Pyrazole Ligands: from 3D-Frameworks Structures in Molecular Complexes

Miguel Guerrero ^A , José A. Pérez ^A , Teresa Calvet ^B , Mercè Font-Bardía ^C and Josefina Pons ^A ^D

+ Author Affiliations

- Author Affiliations

^A Departament de Química, Unitat de Química Inorgànica, Universitat Autònoma de Barcelona, 08193-Bellaterra, Barcelona, Spain.

^B Cristal•lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, Martí i Franquès s/n, 08028-Barcelona, Spain.

^C Unitat de Difracció de RX. Centres Científics i Tecnològics de la Universitat de Barcelona (CCiTUB), Universitat de Barcelona, Solé i Sabarís 1-3, 08028-Barcelona, Spain.

^D Corresponding author. Email: Josefina.Pons@uab.es

Australian Journal of Chemistry 66(6) 685-691 https://doi.org/10.1071/CH13021
Submitted: 13 January 2013 Accepted: 22 March 2013 Published: 13 June 2013

Abstract

In this paper we studied the reaction of ligands 2-[5-phenyl-1-(3,6,9-trioxodecane)-1H-pyrazol-3-yl]pyridine (L1) and 3,5-bis(2-pyridyl)-1-(3,6,9-trioxodecane)-1H-pyrazole (L2) with [MCl₂(CH₃CN)₂] (M = Pd(ii), Pt(ii)), to obtain monomeric complexes [MCl₂(L)] (M = Pd(ii): L = L1 (1), L = L2 (2); M = Pt(ii): L = L1 (3), L = L2 (4)). Additionally, the reaction of [Pd(CH₃COO)₂] with L1 (5) and L2 (6) was also studied pointing out dimeric structures with bridged acetates between the Pd(ii) atoms. All complexes were characterised by elemental analyses, conductivity measurements, infrared spectroscopy (IR), ¹H, ¹³C{¹H}, and ¹⁹⁵Pt{¹H} NMR spectroscopies, and electrospray ionisation mass spectrometry (MS-ESI(+)). The crystal structure of complex [PtCl₂(L1)] (3) was determined by X-ray diffraction methods; it consists of a mononuclear complex where L1 acts as a bidentate chelate ligand. Moreover, we also studied the extended structure observing that the ether, present in the alkyl chain of the ligand, chlorine, and platinum moieties play a fundamental role in the final disposition of the supramolecular structure. All these results show how the design of an appropriate hybrid ligand can strongly influence the structural control of the molecular packing.

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Pd(II) and Pt(II) Coordination Chemistry with Hybrid Pyridine-Pyrazole Ligands: from 3D-Frameworks Structures in Molecular Complexes

Abstract

References

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