Recent advances in guest effects on spin-crossover behavior in Hofmann-type metal-organic frameworks

Confined Crystallization of Spin‐Crossover Nanoparticles in Block‐Copolymer Micelles

“…[2][3][4][5][6] SCO complexes can be switched between two states,the high-spin (HS) and the low-spin (LS) state,by aw ide range of external stimuli [7] such as temperature, pressure,l ight irradiation or the inclusion of guest molecules. [4,8] Furthermore,t he physical properties of either the complex itself (e.g.c olor,m agnetism, structure) [5,9] or associated properties in multifunctional systems (e.g. conductivity, [10] luminescence [11] )change upon switching and raise their interest for applications,e specially as sensors.…”

“…[1] Ah ighly relevant aspect to consider is the stability of the obtained NPs,t he conservation of their functional properties down to very small sizes (if possible the observation of additional size-dependent properties) and the suitability for integration into devices.T he spin crossover (SCO) phenomenon has gained interest in many different fields over the last decades. [2][3][4][5][6] SCO complexes can be switched between two states,the high-spin (HS) and the low-spin (LS) state,by aw ide range of external stimuli [7] such as temperature, pressure,l ight irradiation or the inclusion of guest molecules. [4,8] Furthermore,t he physical properties of either the complex itself (e.g.c olor,m agnetism, structure) [5,9] or associated properties in multifunctional systems (e.g.…”

Switching in Metal–Organic Frameworks

“…[67][68][69] Modulation of hysteresis may be accomplished using powerful intermolecular interactions such as hydrogen bonding and p-p interactions. [69][70][71] SCO compounds which demonstrate thermal hysteresis at room temperature are most useful for application as memory devices. [67] Spin states may be indirectly tracked on account of observable structural changes accompanying the spin transitions.B ecause electron distribution, and consequently quadrupole moment, at the nuclei changes,M çssbauer spectroscopy is as uitable characterization method for these compounds.U V/Vis,I R, Raman spectroscopies and differential scanning calorimetry (DSC) are also appropriate methods for identification through to the variations in optical properties,b ond vibrations,a nd heat content of the states, respectively.…”

Tuning the Spin States of Two Apical Iron(II) Ions in a Pentanuclear Iron(II) Cluster Helicate through the Choice of Anions

“…Hence, one key to preparing SCO compounds is to select a ligand that can provide appropriate cooperativity and field strength [3][4][5]. However, it is difficult to design and regulate SCO phenomenon at a molecular level as the coordination environment of the metal ions in compounds and any tiny structural change will probably result in the radical disappearance of the whole compound's SCO behavior because the influence of the spin transition nature on un-coordinated solvent molecules [6][7][8][9], counterions [10][11][12], and polymorphisms [13][14][15] is quite sensitive. Hence, up to now, it is still very difficult to realize directed regulation of an iron(II) ion's spin state and to carry out more in-depth studies of the relationship between magnetism and structure so as to understand and regulate the influence of the supermolecular effect on SCO behavior.…”