Synthesis, Crystal Structure and Hirshfeld Surface Analysis of a Novel Yb(III) Coordination Polymer Based on 5,5′-Methylenebis(2,4,6-Trimethylisophthalic Acid)
摘要
A new ytterbium-based coordination polymer, [Yb(HBTMIPA)(H2O)4]n (1) (H4BTMIPA = 5,5′-methylenebis(2,4,6-trimethylisophthalic acid)), was synthesized via the solvothermal reaction of Yb(NO3)3·6H2O and H4BTMIPA in a mixture of N,N-dimethylformamide (DMF) and water. Complex 1 crystallizes in the monoclinic space group C2/c and features a rare infinite 1D wavy chain structure constructed by eight-coordinate YbO8 dodecahedra and triply deprotonated HBTMIPA3⁻ ligands, with the latter adopting a novel μ2-bridging coordination mode distinct from its previously reported behavior in other Ln-based frameworks. Adjacent 1D chains are linked via O–H⋯O hydrogen bonds into two-dimensional (2D) supramolecular sheets and further connected by interlayer O–H⋯O interactions to form a three-dimensional (3D) framework. The Hirshfeld surface analysis reveals that O⋯H/H⋯O hydrogen bonds (31.9%) and H⋯H contacts (44.6%) are the dominant intermolecular interactions contributing to the crystal packing. This work is the first report on H4BTMIPA-based Yb(III) coordination polymer, which enriches the structural diversity of lanthanide-based coordination polymers derived from semi-rigid polycarboxylic acid ligands and provides a new structural model for the rational design of low-dimensional Yb-based coordination materials.
Graphical Abstract