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Issue 41, 2012
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Synthesis and characterisation of cobalt(II) phosphonate cage complexes utilizing carboxylates and pyridonates as co-ligands

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Abstract

The synthesis and structures of fifteen new cobalt complexes containing phosphonate ligands are reported. The compounds also utilize carboxylates and 6-chloro-2-pyridonate (chp) as co-ligands. The majority of the compounds are decametallic: [Co10(chp)12(O3PPh)2(O2CPh)4(H2O)4], [Co10(chp)12(O3PPh)2(O2CtBu)4(H2O)4], [Co10(chp)12(O3PPh)2(O2CPhtBu)4(H2O)4], [Co10(chp)6(O3PCH2Ph)2(O2CPh)8(F)2 (H2O)2(EtOAc)2], [Co10(chp)8(O3PCH2Ph)2(O2CPh)8(F)2(MeCN)2](HNEt3)2, [Co10(chp)6(O3PCH2Ph)2(O2CtBu)8(F)2(H2O)2(MeCOMe)2], [Co10(chp)6(O3PMe)2 (O2CtBu)8(F)2(MeCN)4], [Co10(chp)6(O3PEt)2(O2CPh)8(F)2(MeCN)4], [Co10(chp)6(O3POct)2(O2CPh)8(F)2(MeCN)4], [Co10(chp)8(Hchp)2(O3PCH2Nap) (O2CPh)7(OH)3(H2O)], [Co10(chp)12(O3PPh)2(O2CPh-2-Ph)4(H2O)4] and [Co10(chp)12(O3PMe)2(O2CPh-2-Ph)4(H2O)4]. Two nine-metal cages and one hexametallic cage are also reported: [Co9(chp)9(O3PtBu)(O2CtBu)6(OH)], [Co9(chp)7(O3PCH2Ph)2(O3PCH2Ph)(O2CCPh3)5(OH)(H2O)2(MeCN)] and [Co6(chp)6(Hchp)2(O3PtBu)(O2CPh-2-Ph)3(F)(H2O)](HNEt3)(Cl). Magnetic studies show predominantly anti-ferromagnetic exchange interactions between the cobalt(II) sites, with diamagnetic ground states for most of the compounds studied.

Graphical abstract: Synthesis and characterisation of cobalt(ii) phosphonate cage complexes utilizing carboxylates and pyridonates as co-ligands

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Publication details

The article was received on 19 Jul 2012, accepted on 29 Aug 2012, published on 29 Aug 2012 and first published online on 29 Aug 2012


Article type: Paper
DOI: 10.1039/C2DT31612A
Citation: Dalton Trans., 2012,41, 12807-12817
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    Synthesis and characterisation of cobalt(II) phosphonate cage complexes utilizing carboxylates and pyridonates as co-ligands

    S. K. Langley, M. Helliwell, S. J. Teat and R. E. P. Winpenny, Dalton Trans., 2012, 41, 12807
    DOI: 10.1039/C2DT31612A

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