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Template and pH-Mediated Synthesis of Tetrahedral Indium Complexes [Cs⊂{In4(L)4}]+ and [In4(HNL)4]4+: Breaking the Symmetry of N-Centered C3 (L)3− To Give Neutral [In4(L)4]


  • Chelate Complexes, Part 39. This work was supported by the Deutsche Forschungsgemeinschaft SPP 1137 “Molecular Magnetism” (SA 276/26-1–3), SA 276/29-1, SFB 583, GK 312, SPP 1178 “Experimental Charge Density” (STA 334/14-1 and 2), the Bayerisches Langzeitprogrammm Neue Werkstoffe, and the Fonds der Chemischen Industrie. The generous allocation of premises by Prof. Dr. K. Meyer at the Institut für Anorganische Chemie (Universität Erlangen-Nürnberg) is gratefully acknowledged. We also thank Dr. M. Engeser, Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität, Bonn, for recording ESI spectra. Bruker AXS, Karlsruhe, and INCOATEC, Geesthacht, is acknowledged for continuous support. Part 38: Ref. [9a].


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Molecular Kinder eggs are generated from N-centered tripodal heptadentate tris(1,3-diketonate) ions (L3−) in the presence of indium ions. The tetrahedral complexes host a cesium ion ([Cs⊂{In4(L)4}]+, see picture) or four protons. Deprotonation of the species [In4(HNL)4]4+ generates the empty cage compound [In4(L)4], which comes with a break of the symmetry in the initial C3-symmetric tripodal ligand.

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