First 3D 3d−4f Interpenetrating Structure: Synthesis, Reaction, and Characterization of {[LnCr(IDA)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)]}<i><sub>n</sub></i>
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The hydrothermal reaction of Cr(NO3)3, Ln2O3, and iminodiacetate acid (H2IDA) in the molar ratio of 1:1:3 produced {[LnCr(IDA)2(C2O4)]}n (Ln = Eu, 1; Sm, 2), which represent the first 3D 3d−4f interpenetrating coordination polymers. In the reaction, the H2IDA ligands partly decompose into oxalate anions (ox), which connect LnIII ions to form 1D {Ln(ox)}n chains. Each of the CrIII ions is tridentate-coordinated by two IDA ligands, which act as tetradentate metalloligands to link {Ln(ox)}n chains to form 3D open networks. The two open networks interpenetrate each other to form nonporous products. 1 and 2 are thermally stable up to 327 and 360 °C, respectively. Both of complexes show normally paramagnetic behavior. The luminescent results imply that the energy transfers from LnIII to CrIII are strong.
