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.
Dalton Transactions
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