0000000001301021
AUTHOR
G. Bravic
Synthesis, crystal structure, magnetic properties and 57Fe Mossbauer spectroscopy of the new trinuclear [Fe3(4-(2'-hydroxyethyl)-1,2,4- triazole)6(H2O)6](CF3SO3)6 spin crossover compound
Hyetrz = 4-(2prime-hydroxyethyl)-1,2,4-triazole represents the first structurally characterized iron(II) spin crossover compound for which the structure has been solved above and below room temperature in both spin states. The compound crystallizes in the trigonal system, space group R3, a = 12.763(1) b= 67.144(1), V = 1684.3(1) 3, Z = 6 at 120K. At 330K the space group is retained and a = 13.0183(3) b=67.376(3), V = 1805.8(1) 3. The molecular structure consists of trinuclear FeII entities linked together by an unprecedented three-dimensional network of hydrogen bonds. This compound shows a gradual spin crossover behavior centered around room temperature, which has been followed by temperat…
A spin transition molecular material with a wide bistability domain.
International audience; [Fe(hyptrz)3](4-chloro-3-nitrophenylsulfonate)22 H2O (1; hyptrz=4-(3-hydroxypropyl)-1,2,4-triazole) has been synthesized and its physical properties have been investigated by several physical techniques including magnetic susceptibility measurements, calorimetry, and Mössbauer, optical, and EXAFS spectroscopy. Compound 1 exhibits a spin transition below room temperature, together with a very wide thermal hysteresis of about 50 K. This represents the widest hysteresis loop ever observed for an FeII-1,2,4-triazole spin transition material. The cooperativity is discussed on the basis of temperature-dependent EXAFS studies and of the structural features of a CuII analogu…
Crystal structure and physical properties of the new linear chain compound [Cu(1,2-bis(tetrazol-1-yl)ethane)3](ClO4)2
The synthesis and crystal structure of a novel one-dimensional Cu(II) compound [Cu(1,2-bis(tetrazol-1-yl)ethane)3](ClO4)2 are described. The single-crystal X-ray structure determination was carried out at 298 K. The molecular structure consists of a linear chain in which the Cu(II) ions are linked by three N4,N4' coordinating bis(tetrazole) ligands in syn conformation. The Cu(II) ions are in a Jahn-Teller distorted octahedral environment (Cu(1)-N(11)=2.034(2) A, Cu(1)-N(21)=2.041(2) A and Cu(1)-N(31)=2.391(2) A). The Cu⋯Cu separations are 7.420(3) A.
CCDC 134367: Experimental Crystal Structure Determination
Related Article: Y.Garcia, P.Guionneau, G.Bravic, D.Chasseau, J.A.K.Howard, O.Khan, V.Ksenofontov, S.Reiman, P.Gutlich|2000|Eur.J.Inorg.Chem.||1531|doi:10.1002/1099-0682(200007)2000:7<1531::AID-EJIC1531>3.0.CO;2-C
CCDC 134366: Experimental Crystal Structure Determination
Related Article: Y.Garcia, P.Guionneau, G.Bravic, D.Chasseau, J.A.K.Howard, O.Khan, V.Ksenofontov, S.Reiman, P.Gutlich|2000|Eur.J.Inorg.Chem.||1531|doi:10.1002/1099-0682(200007)2000:7<1531::AID-EJIC1531>3.0.CO;2-C
CCDC 161006: Experimental Crystal Structure Determination
Related Article: P.J.van Koningsbruggen, Y.Garcia, G.Bravic, D.Chasseau, O.Kahn|2001|Inorg.Chim.Acta|326|101|doi:10.1016/S0020-1693(01)00645-4
CCDC 180978: Experimental Crystal Structure Determination
Related Article: Y.Garcia, J.Moscovici, A.Michalowicz, V.Ksenofontov, G.Levchenko, G.Bravic, D.Chasseau, P.Gutlich|2002|Chem.-Eur.J.|8|4992|doi:10.1002/1521-3765(20021104)8:21<4992::AID-CHEM4992>3.0.CO;2-8