Barrel- and Crown-Shaped Dodecanuclear Copper(II) Cages Built from Phosphonate, Pyrazole, and Hydroxide Ligands Article - 2008

Vadapalli Chandrasekhar, Loganathan Nagarajan, Rodolphe Clérac, Surajit Ghosh, Tapas Senapati, Sandeep Verma

Vadapalli Chandrasekhar, Loganathan Nagarajan, Rodolphe Clérac, Surajit Ghosh, Tapas Senapati, Sandeep Verma, « Barrel- and Crown-Shaped Dodecanuclear Copper(II) Cages Built from Phosphonate, Pyrazole, and Hydroxide Ligands  », Inorganic Chemistry, 2008, pp. 5347-5354. ISSN 0020-1669

Abstract

The reaction of Cu(ClO4)2 * 6H2O with t-BuP(O)(OH)2 and 3,5-(CF3)2PzH in the presence of triethylamine afforded the dodecanuclear cage [Et3NH]2[Cu12(μ-3,5-(CF3)2Pz)6(μ3-OH)6(μ-OH)3(μ3-t-BuPO3)2(μ6-t-BuPO3)3][t-BuPO2OH]- [C6H5CH3]2 (2). The molecular structure of this cage revealed that it possesses a barrel-shaped architechture. The cage structure is built by the cumulative coordination action of phosphonate, hydroxide, and pyrazolyl ligands. A similar reaction involving Cu(NO3)2 * 3H2O, t-BuP(O)(OH)2, 3,5-dimethylpyrazole, and triethylamine afforded another dodecanuclear cage [Cu12(μ-DMPz)8(η1-DMPzH)2(μ4-O)2(μ3-OH)4(μ3-t-BuPO3)4] * 3MeOH (3). The latter is crownshaped and is built by the coordination of pyrazole, pyrazolyl, phosphonate, hydroxide, oxide, and methanol ligands. Both of the dodecanuclear cages are efficient nucleases in the presence of magnesium monoperoxyphthalate.

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