Macrobicyclic d-metal tris-dioximates obtained by cross-linking with p-block elements—V. Synthesis and properties of polymeric germanium-containing iron(II) dioximates

Template condensation on the Fe 2+ ion and exchange reactions of cross-linking groups were used to obtain macrobicyclic germanium-containing iron(II) tris-dioximates, which were isolated as polymeric compounds of the composition [H 2 FeD 3 (Ge 2 O 3 )· x (solvent)] n . IR, UV-vis and ( 57 Fe) Mossbauer spectra have been obtained. The coordination polyhedron of iron(II) atoms has a trigonal antiprismatic geometry close to octahedral according to the Mossbauer spectroscopic data. The “macrocyclic” ligand field-force increase effect in germanium-containing complexes is close to that in boron-containing clathrochelates and is much more pronounced than in their tin-containing analogues. The polymeric structure was formed through the bridging oxygen atoms of the cross-linking groups.