The integration of spin crossover (SCO) magnetic switching and electric polarization properties can engender intriguing correlated phenomena. However, achieving substantial SCO-induced change through rational molecular design remains a formidable challenge. Herein, we present polar Fe(II) compound that exhibits in response to thermally regulated low-spin ↔ high-spin transition. This large is realized by harnessing an unusual SCO-actuated displacement the ion, encapsulated within cage-like...

The development of molecular materials whose physical properties can be switched between different states has attracted significant attention for their potential application in sensing, information processing, spintronics, and smart actuators. Generally speaking, such functional bistability induced by the motion electrons or constituted molecules response to external stimuli. In this Feature Article, we will introduce how manipulate structural variations, including spin crossover,...

A pure organic single crystal, [H2dabco]·[2CB]2 ([H2dabco]2+ = diprotonated 1,4-diazabicyclo[2.2.2]octane, 2CB– 2-chlorobenzoate), which undergoes a ferroelectric-to-paraelectric phase transition above room temperature (∼323 K upon heating), was prepared and characterized. This ferroelectric crystal possesses distinctive supramolecular architecture composed of discrete H-bonded trimeric units (two anions bridged by one [H2dabco]2+ cation through N–H···O hydrogen bond interactions). In the...

Controlling molecular chirality by external stimuli is of great significance in both fundamental research and technological applications. Herein, we report a high-temperature (384 K) ferroelectric Cu(II) complex whose spontaneous polarization can be switched associated with flipping chirality. In this two-dimensional perovskite structure, the inorganic layer separated (NH3(CH2)2SS(CH2)2NH3)2+ organic cations skewed chiral conformation (P- or M-helicity an individual crystal). As...

The striking aesthetic appeal of fullerene-like clusters has captured the interest researchers. Nevertheless, assembly polyoxovadanadate (POV) cages remains a significant challenge due to scarcity suitable pentagonal motif. Herein, we have successfully synthesized first all-inorganic POV cage, {(V

Abstract Pyroelectric materials hold significant potential for energy harvesting, sensing, and imaging applications. However, achieving high‐performance pyroelectricity across a wide temperature range near room remains challenge. Herein, we demonstrate single crystal of Fe(II) spin‐crossover compound shows remarkable pyroelectric properties accompanied by thermally controlled spin transition. In this material, the uniaxial alignment polar molecules results in polarization lattice. As...

Abstract Harnessing molecular motion to reversibly control macroscopic properties, such as shape and size, is a fascinating challenging subject in materials science. Here we design crystalline cobalt(II) complex with an n -butyl group on its ligands, which exhibits reversible crystal deformation at structural phase transition temperature. In the low-temperature phase, of freezes. On heating, rotates ca. 100° around C–C bond resulting 6–7% expansion size along packing direction. Importantly,...

Abstract Flexible porous materials generally switch their structures in response to guest removal or incorporation. However, the design of with empty shape-switchable pores remains a formidable challenge. Here, we demonstrate that structural transition between an orthorhombic phase and tetragonal flexible dodecatuple intercatenated supramolecular organic framework can be controlled cooperatively through incorporation thermal treatment, thus inducing shape-memory nanopores. Moreover, was...

Abstract Heterometallic Prussian blue analogues are known to exhibit thermally induced charge transfer, resulting in switching of optical and magnetic properties. However, charge‐transfer phase transitions have not been reported for the simplest FeFe cyanide‐bridged systems. A mixed‐valence Fe II /Fe III coordination polymer, {[Fe(Tp)(CN) 3 ] 2 Fe(bpe)⋅5 H O} n , which demonstrates a transition, is described. As result transfer during this high‐spin state whole system does change low‐spin...

Host-guest interactions play critical roles in achieving switchable structures and functionalities porous materials, but design control remain challenging. Here, we report a two-dimensional magnetic compound, [FeII(prentrz)2PdII(CN)4] (prentrz = (1E,2E)-3-phenyl-N-(4H-1,2,4-triazol-4-yl)prop-2-en-1-imine), which exhibits an atypical pore transformation that directly entangles with spin state transition response to water adsorption. In this material, the adsorption-induced, non-uniform pedal...

Shenfu coal (SFC), its liquefaction residue (RL), and carbon disulfide (CS2)/tetrahydrofuran (THF)-inextractable matter (RE) were subject to ruthenium ion-catalyzed oxidation understand the differences in structural features among above three samples. The results suggest that SFC is rich long-chain arylalkanes α,ω-diarylalkanes (DAAs) with number of methylene linkage from 2 4 DAAs are reactive toward hydroliquefaction soluble a CS2/THF mixed solvent, whereas highly condensed aromatic species...

Shenfu coal (SFC) oxidation with RuO4 and NaOCl were studied compared. Most of organic matter in SFC was converted into soluble species either the oxidants. Benzene polycarboxylic acids (BPCAs) alkanoic (AAs) are main products from reactions. The rich long-chain AAs, whereas those predominantly consist chloro-substituted short-chain AAs BPCAs. related reaction mechanisms discussed according to experimental results.

Abstract Materials demonstrating unusual large positive and negative thermal expansion are fascinating for their potential applications as high-precision microscale actuators compensators normal solids. However, manipulating molecular motion to execute huge of materials remains a formidable challenge. Here, we report single-crystal Cu(II) complex exhibiting giant actuated by collective reorientation imidazoliums. The circular cations, which rotationally disordered at high temperature...

The molecular crystals that manifest unusual mechanical properties have attracted growing attention. Herein, we prepared an organic single crystal shows bidirectional superelastic transformation in response to shear stress. Single-crystal X-ray diffractions revealed this crystal-twinning related shape change is owed a stress-controlled 90° rotation of 4,4'-bipyridine around the hydrogen bonds chiral trimer. As consequence shift aromatic plane, interconversion crystallographic a-, b-axes...

Abstract The grafts of fluorophores 9‐anthraldehyde (AD) and 9‐phenanthrenecarboxaldehyde (PD), respectively, on the one‐dimensional spin‐crossover compound [Fe(L) 3 ](ClO 4 ) 2 (FeL, L=4‐amino‐1,2,4‐triazole) by post‐synthetic aldimine condensation reactions produced two (SCO)–fluorescent hybrid materials, that is, FeL‐AD FeL‐PD. critical temperatures materials both centered at T c ↓=254 ↑=256 K, whereas fluorescence intensities featured functions temperature strictly synchronized with...

Responsive spin-crossover (SCO) metal–organic cages (MOCs) are emerging dynamic platforms with potential for advanced applications in magnetic sensing and molecular switching. Among these, FeIII-based MOCs particularly noteworthy their air stability, yet they remain largely unexplored. Herein, we report the synthesis of two novel FeIII using a bis-bidentate ligand approach, which exhibit SCO activity above room temperature. These represent first SCO-active feature an atypical {FeN6}-type...

Abstract Atypically anisotropic and large changes in magnetic susceptibility, along with a change crystalline shape, were observed Co II complex at near room temperature. This was achieved by combining oxalate molecules, acting as rotor, ion unquenched orbital angular momentum. A thermally controlled 90° rotation of the counter anion triggered symmetry‐breaking ferroelastic phase transition, accompanied contraction–expansion behavior (ca. 4.5 %) long axis rod‐like single crystal. The...

Abstract The development of magnetic molecules with long spin reversal/decoherence times highly depends on the understanding relaxation behavior under different external conditions. Herein, a study Ru III complex ( 1 ) is presented. Detailed analysis time and magneto‐heat capacity data suggests that resonant phonon trapping process dominates in crystalline sample , slowing down rate, as further confirmed by measurements ground frozen solution. Thus, it provides rare example showing 4d...

Numerous single crystals that exhibit single-crystal-to-single-crystal (SCSC) transformations have been reported, and some of them show great promise for application to advanced adsorption materials, magnetic switches, smart actuators. However, the development with super-adaptive crystal lattices capable huge reversible structural change remains a challenge. In this study, we report ZnII complex undergoes giant SCSC transformation induced by two-step thermal elimination ethylene glycol...

Materials that demonstrate a multichannel controllable color change in response to external stimuli are fascinating for their potential applications sensoring and displaying devices. Herein we report FeII spin-crossover (SCO) compound exhibits both solvatochromism thermochromism under an ambient environment. This Hofmann-type possesses two different pores where the solvent guests can be removed two-step process. Because loss of modifies spin state magnetic centers, unusual yellow–red–yellow...

Homochiral and racemic polymorphs show different spin-crossover behaviours due to intermolecular interactions, reversible LIESST effects can be realized on homochiral complexes.