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Coordination Networks with Carborane Anions: Ag(i) and Nitrogen Bridging Ligands

Luís Cunha-Silva ^A , Ruksanna Ahmad ^A and Michaele J. Hardie ^A ^B

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^A School of Chemistry, University of Leeds, Leeds LS2 9JT, UK.

^B Corresponding author. Email: m.j.hardie@leeds.ac.uk

Australian Journal of Chemistry 59(1) 40-48 https://doi.org/10.1071/CH05325
Submitted: 9 December 2005 Accepted: 9 January 2005 Published: 31 January 2006

Abstract

New crystalline coordination networks based on Ag(i) and N-bridging ligands — pyrazine (pyz), 4,4′-bipyridine (bpy), and 2,3-bis-(2-pyridyl)pyrazine (bppz) — incorporating carborane monoanions (CB₁₁H₁₂)⁻ or [Co(C₂B₉H₁₁)₂]⁻ were isolated and characterized using single crystal X-ray diffraction, microanalysis, and infrared spectroscopy. All the complexes with the bpy and bppz ligands reveal 1D coordination infinite chains involving the Ag(i) and the ligands, and layered extended structures with rows of carborane anions between the layers of chains. Interestingly, two polymorphs of the complex [Ag(bpy)(CH₃CN)][Co(C₂B₉H₁₁)₂] were observed. The complex [Ag(pyz)(CH₃CN)₂][Co(C₂B₉H₁₁)₂] shows a 1D coordination polymer, while the pyz complex with the smaller carborane anion {[Ag(pyz)](CB₁₁H₁₂)} exhibits a 3D coordination network structure with four Ag···H−B interactions between the silver centre and carborane anions.

Acknowledgments

We thank the Fundação para a Ciência e a Tecnologia, Ministério da Ciência, Tecnologia e Ensino Superior, Portugal, for a fellowship for L.C.S. (SFRH/BPD/14410/2003), the EPSRC for equipment funding, and the University of Leeds for additional funding.

References

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