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Spin crossover in metallomesogens
Coordination Chemistry Reviews, 2009Abstract In this review article are illustrated the strategies developed in order to achieve interplay/synergy between spin transition and liquid crystal transition. The synthesised Fe(II) metallomesogens exhibit different types of interplay between both phase transitions. A classification according to the analysis of the magnetic and structural data
A.B. Gaspar, M. Seredyuk, P. Gütlich
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Macrocycle-Based Spin-Crossover Materials
Inorganic Chemistry, 2009New iron(II) complexes of formula [Fe(L1)](BF(4))(2) (1) and [Fe(L2)](BF(4))(2) x H(2)O (2) (L1 = 1,7-bis(2'-pyridylmethyl)-1,4,7,10-tetraazacyclododecane; L2 = 1,8-bis(2'-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane) have been synthesized and characterized by infrared spectroscopy, variable-temperature single-crystal X-ray diffraction, and ...
El Hajj, Fatima +9 more
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Heisenberg-Ising crossover in spin glasses
Physical Review B, 1986The small anisotropy always present in real spin glasses induces a finite-temperature phase transition of Ising character. We argue that the width of the Ising-like critical regime should be comparable with teh transition temperature itself. Furthermore, for realistic values of the anisotropy there is no well-defined Heisenberg-like critical regime at ...
, Bray, , Moore
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Nanoparticles of iron(ii) spin-crossover
Chemical Communications, 2008We report the synthesis of spin crossover 69 nm spherical nanoparticles of [Fe(NH2-trz)3](Br)2.3H2O.0.03(surfactant) (NH2trz = 4-amino-1,2,4-triazole, surfactant = Lauropal), prepared by the reverse micelle technique, which exhibit at room temperature a thermal hysteresis characterized by magnetic, diffuse reflectivity and Raman studies.
Thibaut, Forestier +8 more
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Dynamical crossover in hot spin ice
Journal of Physics: Condensed Matter, 2002The magnetic dynamics of the spin ice material Ho2Ti2O7 in its paramagnetic ('hot') phase have been investigated by a combination of neutron spin echo and ac-susceptibility techniques. Relaxation at high temperatures ( 15$>T > 15 K) is proved to occur by a thermally activated single-ion process that is distinct from the process that dominates at lower ...
Ehlers, G. +6 more
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Light-induced spin-crossover magnet
Nature Chemistry, 2011The light-induced phase transition between the low-spin (LS) and high-spin (HS) states of some transition-metal ions has been extensively studied in the fields of chemistry and materials science. In a crystalline extended system, magnetically ordering the HS sites of such transition-metal ions by irradiation should lead to spontaneous magnetization ...
Shin-Ichi, Ohkoshi +4 more
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Spin Crossover in a Catenane Supramolecular System
Science, 1995The compound [Fe(tvp) 2 (NCS) 2 ] ⋅ CH 3 OH, where tvp is 1,2-di-(4-pyridyl)-ethylene, has been synthesized and characterized by x-ray single-crystal diffraction. It consists of two perpendicular, two-dimensional networks organized in parallel stacks of sheets made up ...
J A, Real +6 more
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Inducing hysteretic spin crossover in solution
Dalton Transactions, 2012A hysteretic spin transition is induced in a solution assembly of a mononuclear Fe(III) amphiphilic complex which exhibits only gradual spin crossover in the solid state. The hysteretic behavior is dependent on dynamic solution assembly and removal of solvent causes reversion to the original bulk solid magnetic response.
Paulo N, Martinho +7 more
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Non-isothermal kinetics of spin crossover
Physical Chemistry Chemical Physics, 2017Non-isothermal magnetic studies can be used to estimate the activation energy of cooperative spin transition.
Mark B. Bushuev +2 more
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