Reproducible Synthesis of a Monofluorinated Trimesate: A Versatile Linking Ligand for the Construction of Lanthanide Coordination Polymers

摘要

> The synthesis of monofluorinated trimesic acid (H ₃ mfBTC = 2‐fluoro‐1,3,5‐benzene‐tricarboxylic acid) described in the literature leads in fact to its monopotassium salt K(H ₂ mfBTC) ( 1 ), which was identified by a single crystal structure analysis ( Pc, Z = 2). It is obtained as a single‐phase product and shows good solubility in water so that from aqueous solutions fourteen new coordination polymers with Ln III cations were synthesized and structurally characterized. Depending on the size of the cations three different structure types with different water contents were observed. For Ln III = La 3+ – Nd 3+ and Sm 3+ – Gd 3+ the composition 1 _∞ [ Ln III (mfBTC) _3/3 (H ₂ O) ₆ ] was found and confirmed by a structural analysis ( Cc, Z = 4; CN = 9). For Ln III = Tb 3+ – Ho 3+ the composition 2 _∞ [ Ln III (mfBTC) _3/3 (H ₂ O) ₃ ] · H ₂ O was obtained and confirmed by X‐ray single crystal structure analysis ( C 2/ c, Z = 8; CN = 9). Finally, for Ln III = Er 3+