A Porous Coordination‐Polymer Crystal Containing One‐Dimensional Water Chains Exhibits Guest‐Induced Lattice Distortion and a Dielectric Anomaly

Abstract

Ice one: A porous molecular crystal with guest water molecules in the channels—[La2Cu3{NH(CH2COO)2}6](H2O)n (see picture)—exhibits a distinct peak for the dielectric constant at 180 K (εr≈150) with the electric field parallel to the channel direction. This crystalline compound also shows a large enhancement of εr above 250 K and a characteristic antiferroelectric hysteresis coupled with a liquid–solid transition of the guest water molecules at around 350 K.

Anomalous Dielectric Behavior of Nanoconfined Electrolytic Solutions

“…The latter effect could also explain the interfacial increase in for a hydrophobic surface [17], as caused by a deficient HB network at the interface. The dielectric anisotropy of the confined water is supported by the recent dielectric measures carried out by Cui et al on metal organic frameworks (MOFs) [18][19][20]. They provided a protocol able to measure k and ?…”

“…However, in the Supplemental Material [10] we compare this with an overall calculation. This can be used for comparisons with experiments using the protocol proposed by Cui et al [18][19][20]. Thus, given the cylindrical symmetry of our silica mesoporous material and the possibility to get ordered mesoporous silica samples, it is possible to measure k and ?…”

Hierarchical Frameworks of Metal–Organic Cages with Axial Ferroelectric Anisotropy

“…Notably the higher e' values of 1 and 2 over the other frameworks 3 and 4 supports the ferroelectric nature of 1 and 2.T he broad nature of these anomaly peaks can be attributed to the motional dynamics of the looselyb ound anionsa nd solvate molecules within the pockets betweent he cages. [14] The dielectric maxima may be induced by the order-disorder-like process of theseh ydrogenbondeds olvates and anions. Further,t hesea nomaly peaks tend to take up relaxer-like behaviour at highert emperatures due to desolvation, which is well supported by TGA-DTA,V T-PXRD and FT-IR measurements (Supporting Information , Figure S42-S48).…”

Recent advances in CdII coordination polymers: Structural aspects, adaptable assemblies, and potential applications

“…As a rule, the rational construction of structurally-defined coordination polymers is primarily dependent on the foundation of coordination bonds for interconnecting the pre- selective building components, which can meet the requirement of metal-ligand binding preference and also, the energetic consideration of the overall crystal packing [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. That is to say, according to the node-and-spacer approach, the arrangement of organic ligands (spacers) can be maturely manipulated by the metal ions (nodes) in virtue of the direction of coordination bonds, which thus, provides the possibility for prediction and design of the final coordination networks [27][28][29][30][31][32][33].…”