title: Anomalous dielectric behavior and thermal motion of water molecules confined in channels of porous coordination polymer crystals.
abstract: Guest water molecules confined in channels of porous coordination polymer crystals [Ln(2)Cu(3)(IDA)(6)]·nH(2)O (Ln = La, Nd, Sm, Gd, Ho, Er; IDA = [NH(CH(2)COO)(2)](2-); n ≈ 9) exhibited large dielectric constants (ε) and antiferroelectric behaviors at high temperatures (e.g., ε(Sm) ≈ 1300 at 400 K). In addition, plots of the temperature dependence of ε showed broad peaks at ∼170 K, below which ε became very small. These puzzling temperature dependences of ε are consistent with the results of molecular dynamics simulations, suggesting the "freezing of thermal motion" of water molecules at ∼170 K.
authors: Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan.
authors: Biao
authors: B
authors: Zhou
authors: Akiko
authors: A
authors: Kobayashi
authors: Heng-Bo
authors: HB
authors: Cui
authors: La-Sheng
authors: LS
authors: Long
authors: Hiroki
authors: H
authors: Fujimori
authors: Hayao
authors: H
authors: Kobayashi
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D009038:Motion; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D011108:Polymers; D014867:Water