{2}-Metallocryptands of Iron and Gallium: Synthesis, Structure, and Properties [1]

Abstract

Starting from CH-acidic tetradentate ligands H2L (1) and triethylamine, the synthesis and characterisation of four,dinuclear iron(III) and gallium(III) cryptands [M-2(L)(3)] (3, 4) are reported. The structures of the ligand H2L (1a) and the triple helicate 3b were determined by X-ray diffraction analysis. The ferric complexes 3 were further characterised by Mossbauer spectroscopy and cyclic voltammetry. NMR spectroscopy proved the diamagnetic gallium(III) cryptands 4 to remain stable in solution for several days.