Spin Crossover between the High-Spin and Low-Spin States and Dielectric Switching in the Ionic Crystals of a Fe(II) [2 × 2] Molecular Grid

Abstract

We synthesized an Fe(II) [2 × 2] molecular grid with pyridyl-substituted bis-terdentate ligands. The molecular grid showed abrupt spin crossover between fully high-spin and fully low-spin states in a narrow temperature width of ∼10 K. The spin crossover event also included a first-order structural phase transition, in which the dielectric constant jumped atypically toward a low-spin state.

Thermal‐induced dielectric response in mechanically durable polyvinylidene fluoride–kapok encapsulated polyethylene glycol composite films

“…Thermally responsive dielectric materials have received increasing attention in the last decade because of their ability to undergo dielectric transitions in response to temperature stimuli. [1][2][3][4] These materials can undergo transitions from high to low dielectric states or vice versa in a narrow temperature interval, [5][6][7][8][9] exhibit a distinct bistability, [10][11][12] and thus have a wide range of applications in new smart Yutie Gong and Zhenzhen Li contributed equally to this work. devices, sensors, switches, actuators, etc.…”

Thermal-induced dielectric response in mechanically durable polyvinylidene fluoride/kapok encapsulated polyethylene glycol composite films

“…Thermally responsive dielectric materials have received increasing attention in the last decade because of their ability to undergo dielectric transitions in response to temperature stimuli. [1][2][3][4] These materials can undergo transitions from high to low dielectric states or vice versa in a narrow temperature interval, [5][6][7][8][9] and exhibit a distinct bistability, [10][11][12] having a wide range of applications in new smart devices, sensors, switches, actuators, etc. Among these materials, porous molecular materials containing guest small molecules or ions have become a research hotspot.…”

“…[13] When the temperature reaches a certain temperature, the ordered-disordered transition produced by the guest molecules within the system allows the appearance of two or more signi cantly different dielectric states. [12,14] Despite the excellent dielectric properties of such materials, the complicated design and preparation process, as well as the intrinsic defects in the mechanical properties of the materials, make them a major obstacle in their applications. Moreover, the mechanical properties of thermo-responsive dielectric materials have rarely been reported.…”

Thermal-Induced Dielectric Response In Mechanically Durable Polyvinylidene Fluoride/Tubular Kapok Fiber Encapsulated Polyethylene Glycol Composite Films

“…Thermally responsive dielectric materials have received increasing attention in the last decade because of their ability to undergo dielectric transitions in response to temperature stimuli (Rullyani et Uezu et al, 2020), having a wide range of applications in new smart devices, sensors, switches, actuators, etc. Among these materials, porous molecular materials containing guest small molecules or ions have become a research hotspot (Xu, Zhang, Huang, & Liu, 2021).…”

“…Among these materials, porous molecular materials containing guest small molecules or ions have become a research hotspot (Xu, Zhang, Huang, & Liu, 2021). When the temperature reaches a certain temperature, the ordered-disordered transition produced by the guest molecules within the system allows the appearance of two or more signi cantly different dielectric states (Uezu et al, 2020;Zhang et al, 2014). Despite the excellent dielectric properties of such materials, the complicated design and preparation process, as well as the intrinsic defects in the mechanical properties of the materials, make them a major obstacle in their applications.…”