The magnetic properties of many materials can be controlled by external stimuli. principal focus here is on the thermal, photochemical, electrochemical, and chemical control phase transitions that involve changes in magnetization. molecular compounds described herein range from metal complexes, through pure organic to composite materials. Most Review devoted valence-tautomeric compounds, magnets, spin-crossover which could find future application memory devices or optical switches.

Two photoluminescent two- and three-dimensional coordination polymers consisting of Zn4O [or Zn4(OH)2] cores, dicarboxylate (isophthalate or fumarate) 4,4′-bipyridine ligands as building blocks have been hydrothermally synthesized structurally characterized.

The long-sought-after crystal structure of Fe(tpa)(NCS)2 (1, tpa = tris(2-pyridylmethyl)amine), an otherwise well-studied spin-crossover (SCO) complex, has been obtained, and its one-step, incomplete spin transition was correlated to solid-state structures at different temperatures. Upon exposure methanol vapor, single-crystal-to-single-crystal transformation 1 a new SCO compound, 2, formulated as {[Fe(tpa)(NCS)2]·[Fe(tpa)(NCS)2·CH3OH]}, occurs with dramatic color change from yellow red....

Direct electrochemical nitrate reduction reaction (NITRR) is a promising strategy to alleviate the unbalanced nitrogen cycle while achieving electrosynthesis of ammonia. However, restructuration high-activity Cu-based electrocatalysts in NITRR process has hindered identification dynamical active sites and in-depth investigation catalytic mechanism. Herein, Cu species (single-atom, clusters, nanoparticles) with tunable loading supported on N-doped TiO2/C are successfully manufactured...

Abstract Mechanically interlocked molecules (MIMs) including famous catenanes show switchable physical properties and attract continuous research interest due to their potential application in molecular devices. The advantages of using spin crossover (SCO) materials here are enormous, allowing for control through diverse stimuli highly specific functions, enabling the transfer internal dynamics MIMs from solution solid state, leading macroscopic applications. Herein, we report efficient...

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...

Three new metal–organic co-ordination frameworks formulated as [M(tp)(4,4′-bipy)] [M = CoII1, CdII2 or ZnII3; tp terephthalate; 4,4′-bipy 4,4′-bipyridine] have been hydrothermally prepared and structurally characterized. Each pair of metal atoms in the three compounds are bridged by bis-bidentate chelating/bridging ligands to form a linear zigzag chain, adjacent chains further linked chelating monodentate two-dimensional rectangular parallelogram-like [M(tp)] sheets with dimensions 10.30 ×...

A photoluminescent inorganic−organic material formulated as [Zn3(μ3-OH)(μ2-OH)(4,4'-bpy)0.5(4,4'-oba)2]·0.5H2O (4,4'-bpy = 4,4'-bipyridine; 4,4'-oba 4,4'-oxybis(benzoate)), shown by X-ray diffraction, features a novel polynuclear zinc helical chain motif. Linkage of mixed organic ligands and chains results in 3-D network.

Abstract Man kennt eine Vielzahl magnetischer Materialien, deren magnetische Eigenschaften durch externe Stimuli geschaltet werden können. Das Hauptaugenmerk liegt auf der thermischen, photochemischen, elektrochemischen und chemischen Steuerung von Phasenübergängen, die mit einem Wechsel Magnetisierung einhergehen. Die Bandbreite beschriebenen Spezies reicht Metallkomplexen über rein organische Verbindungen bis zu Kompositmaterialien, wobei Schwerpunkt dieses Aufsatzes den valenztautomeren...

A novel coordination polymer of mixed-valence copper(I,II) with 4,4′-bipyridine and in situ oxidized isophthalate, [Cu2(ipO)(4,4′-bpy)] (ipOH = 2-hydroxyisophthalate), was hydrothermally synthesized crystallographically characterized to be a laminated structure via weak copper(II)–oxygen interactions.

Reaction of 5,5'-(1,4-phenylene)bis(1H-tetrazole), which was prepared in two steps, with cadmium nitrate DMF produced a three-dimensional framework one-dimensional channels (35% void volume), unprecedented hydrogen-bond-supported D2h tetrameric cyclic water clusters ranked.

A dinuclear complex, [(CoTPA)2(DHBQ)](PF6)3, has been successfully synthesized that exhibits a valence tautomeric transition with distinct hysteresis effect (13 K) around room temperature and photoinduced tautomerism under low temperature.

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Hybrid materials integrated with a variety of physical properties, such as spin crossover (SCO) and fluorescence, may show synergetic effects that find applications in many fields. Herein we demonstrate promising post-synthetic approach to achieve by grafting fluorophores (1-pyrenecarboxaldehyde Rhodamine B) on one-dimensional SCO Fe(II) structures. The resulting hybrid display expected one-step behavior fluorescent particular showing coupling between the transition temperature where...

High or low? A square FeII4 compound exhibits complete thermally and optically activated transition from four low-spin (LS) centers to high-spin (HS) in two steps (see plot of magnetic susceptibility). Reversible desorption resorption guest water molecules causes a single-crystal-to-single-crystal transformation. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited typeset. They made available submitted by...

By changing template cation but introducing trivalent iron ions in the known niccolite structural metal formate frameworks, three complexes formulated [NH2(CH3)2][FeIIIMII(HCOO)6] (M = Fe for 1, Mn 2, and Co 3) were synthesized magnetically characterized. The variation compositions of leads to different complexes: mixed-valent complex heterometallic with same spin state heterospin 3. magnetic behaviors are closely related divalent used. Complex 1 exhibits negative magnetization assigned as...

Correlation between molecular structures and slow relaxation of magnetization three mixed (phthalocyaninato)(porphyrinato) dysprosium(III) double-deckers clearly reveals the effect sandwich-type structure, in particular twist angle, on quantum tunneling (QT) at zero dc field these complexes, providing first direct evidence to theoretical inference.

Clusterfullerenes are capable of entrapping a variety metal clusters within carbon cage, for which the entrapped cluster generally keeps its geometric structure (e.g., bond distance and angle) upon changing isomeric fullerene whether properties is geometry-dependent remains unclear. Herein we report an unusual triangular monometallic in cage by isolating several novel terbium cyanide clusterfullerenes (TbNC@C82) with different structures. Upon varying C82 from C2(5) to Cs(6) C2v(9), TbNC...

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,...

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...

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...