Introduction to Crossover Properties

What is/are Crossover Properties?

Crossover Properties - We show that the crossover properties are given by tunneling through an effective single barrier described by the boundary sine-Gordon model. ^[1] However, the study of the influence of ligand symmetry on the spin crossover properties is still limited due to the shortage of suitable structural systems. ^[2] Interestingly, the different pillar–ligands showed a significant influence on the structural assembly and spin-crossover properties. ^[3] Our observations indicate that these peculiar spin-crossover properties (slow switching kinetics, scan-rate-dependent transition temperatures) are presumably related to the presence of numerous microstructural defects in the crystals, which is an intrinsic characteristic of this compound. ^[4] With the exception of di- and tetra-3-NO2 substituted complexes, all derivatives display spin crossover properties in the solid state, with transition temperatures ranging from 180 to 380 K and showing different degree of abruptness, but no hysteresis. ^[5] Thus, with the presented system the spin crossover properties are controlled by small alterations of the ligand structures. ^[6] Thus, the spin‐crossover properties can be shifted towards the properties of the related bulk material. ^[7] We discuss the effects that the solvent and counterion had on the crystal packing and spin crossover properties. ^[8] All tris(pyrazolyl)borate complexes retain the spin crossover properties of their parent compound, with spin crossover temperatures ranging from 350 to 430 K. ^[9] However, when these compounds lose the methanol molecules, the magnetic behavior changes drastically giving place to gradual spin conversions evidencing the relevant influence of the guest molecules on the spin-crossover properties. ^[10] Fine control and direct monitoring of the spin crossover properties driven by pressure at room temperature are reported for the porous three-dimensional coordination polymer {Fe(pz)[Pt(CN)4]} by using a homemade pressure cell that transforms a DC voltage into pressure. ^[11] The post-synthetic SCO complexes obtained were studied by magnetometry, powder X-ray diffraction (PXRD), elemental analysis, solid state NMR and IR and compared with the corresponding compounds obtained by direct synthetic routes, revealing new spin crossover properties. ^[12] Our work demonstrates that chirality is a feasible factor to modulate and influence the molecular geometry and thus the spin-crossover properties of complexes. ^[13] Using grazing incidence X-ray diffraction, atomic force microscopy, and variable-temperature UV spectrophotometry, we show how the crystallinity, morphology, and spin crossover properties of the resulting films are altered by exposure to vapors of five different solvents: diethyl ether, acetone, dichloromethane, ethanol, and water. ^[14] All tris(pyrazolyl)borate complexes retain the spin crossover properties of their parent compound, with spin crossover temperatures ranging from 350 to 430 K. ^[15] Therefore, to capture this kind of spread one needs to use differential operators that posses crossover properties and fading memory. ^[16]

Spin Crossover Properties

However, the study of the influence of ligand symmetry on the spin crossover properties is still limited due to the shortage of suitable structural systems. ^[1] With the exception of di- and tetra-3-NO2 substituted complexes, all derivatives display spin crossover properties in the solid state, with transition temperatures ranging from 180 to 380 K and showing different degree of abruptness, but no hysteresis. ^[2] Thus, with the presented system the spin crossover properties are controlled by small alterations of the ligand structures. ^[3] We discuss the effects that the solvent and counterion had on the crystal packing and spin crossover properties. ^[4] All tris(pyrazolyl)borate complexes retain the spin crossover properties of their parent compound, with spin crossover temperatures ranging from 350 to 430 K. ^[5] Fine control and direct monitoring of the spin crossover properties driven by pressure at room temperature are reported for the porous three-dimensional coordination polymer {Fe(pz)[Pt(CN)4]} by using a homemade pressure cell that transforms a DC voltage into pressure. ^[6] The post-synthetic SCO complexes obtained were studied by magnetometry, powder X-ray diffraction (PXRD), elemental analysis, solid state NMR and IR and compared with the corresponding compounds obtained by direct synthetic routes, revealing new spin crossover properties. ^[7] Using grazing incidence X-ray diffraction, atomic force microscopy, and variable-temperature UV spectrophotometry, we show how the crystallinity, morphology, and spin crossover properties of the resulting films are altered by exposure to vapors of five different solvents: diethyl ether, acetone, dichloromethane, ethanol, and water. ^[8] All tris(pyrazolyl)borate complexes retain the spin crossover properties of their parent compound, with spin crossover temperatures ranging from 350 to 430 K. ^[9]