Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Recommanded Product: Sodium trifluoromethanesulfonate, Which mentioned a new discovery about 2926-30-9
Layered iron(II) spin crossover complex constructed by NH?Br – hydrogen bonds with 2 K wide thermal hysteresis, [Fe IIH3LMe]Br¡¤CF3SO3 (H3LMe = tris[2-(((2-methylimidazol-4-yl)methylidene) amino)ethyl]amine)
A series of compounds [FeIIH3LMe] Br¡¤Y¡¤nMeOH (Y=PF6- (1), AsF6- (2), SbF6- (3), CF3SO3- (4); n = 0 or 1) were synthesized, where H3LMe is a hexadentate N6 tripodal ligand of the neutral form, tris[2-(((2-methylimidazol-4- yl)methylidene)amino)ethyl]amine, and their structures and magnetic properties were investigated. The compounds 1-3 with counter anions Y=PF6-, AsF6-, and SbF6- contain methanol as a crystal solvent, and show no SCO behaviors, while the corresponding Cl- compounds have no crystal solvent and show a variety of SCO behaviors. The compound [FeIIH3L Me]Br¡¤CF3SO3 (4) has no crystal solvent and has isomorphous structure to the Cl- compounds, and shows an abrupt spin transition between the HS (S = 2) and LS (S = 0) states with a hysteresis about 2 K and large frozen-in effect below 72 K. The T 1/2? and T1/2? values are 98 and 96 K, whose values are higher than those of corresponding Cl- compound about 15 K and the width of hysteresis is narrower than that of corresponding Cl – compound about 2 K. The crystal structures of 4 were determined at 296 and 93 K, where the crystal system and space group showed no change between these temperatures. The structures at both temperatures have a same 2D layered structure, which is composed of NH?Br- hydrogen bonds between the Br- ion and the imidazole NH groups of three neighboring cations [FeIIH3LMe]2+. This network structure is the same as that of corresponding Cl- compound. The 600 nm light irradiation at 5 K induced the LIESST effect.
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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI