Rational design of the first closed coordination capsule with octahedral outer shape |
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Authors: | Müller Iris M Spillmann Susanne Franck Holger Pietschnig Rudolf |
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Institution: | Lehrstuhl für Analytische Chemie, NC 4/27, Ruhr-University Bochum, 44780 Bochum, Germany. iris.m.mueller@rub.de |
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Abstract: | The rational synthesis of an octahedral coordination capsule in which the triangular faces are covered by single ligands is described herein. Starting with tris(2-hydroxybenzylidene)triaminoguanidinium chloride H(6)L]Cl, we observed an oxidative cyclization of this ligand in the presence of PPh(4) (+) ions resulting in the complex Pd(H(2)L')(PPh(3))] (1). The use of 5,5-diethylbarbiturate (bar(2-)) as a bridging ligand in the presence of Co(en)(3)](3+) (en=ethylenediamine) leads to the formation of a rectangular box with the formula (Et(4)N)(6)Co(PdCl)(Pd)L](2)(mu-bar)](2)] (2). The analysis of the architecture of compounds 1 and 2 enables the development of a self-assembly strategy for the synthesis of an octahedral coordination cage 3 with the formula Na(4)(Et(3)NH)(12)(Pd(3)L)(8)mu-(bar)](12)].x H(2)O. Compound 3 was characterized by (13)C-MAS-NMR spectroscopy and single-crystal structure analysis. |
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Keywords: | cage compounds NMR spectroscopy octahedron self‐ assembly supramolecular chemistry |
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