TY - JOUR
T1 - Synthesis, structure, and magnetic properties of a Tris[3-(2-pyridyl)-l,2,4triazole]iron(II) spin-crossover complex
AU - Stassen, Arno F.
AU - De Vos, Matthijs
AU - Van Koningsbruggen, Petra J.
AU - Renz, Franz
AU - Ensling, Jürgen
AU - Kooijman, Huub
AU - Spek, Anthony L.
AU - Haasnoot, Jaap G.
AU - Gütlich, Philipp
AU - Reedijk, Jan
PY - 2000
Y1 - 2000
N2 - The synthesis and characterization of tris[3-(pyridin-2-yl)1,2,4-triazole]iron{II) bis(tetrafluoroborate), obtained from the reaction of 3-(pyridin-2-yl)-1,2,4-triazole (Hpt) and hexaaquairon(II) tetrafluoroborate, [Fe(H2O)6](BF4)2, is described, together with its crystal structures at two temperatures. Xray crystallographic parameters are as follows: [Fe(Hpt)3](BF4)2-nH2O (n = 2) at 250 K: orthorhombic space group Pbam, a - 15.8068(18) A, b = 17.2800(14) A, c = 21.215(2) A, V = 5794.7(10) A3, and Z = 8. [Fe(Hpt)3](BF4)2-nH2O (n = 2) at 95 K: orthorhombic space group Pbam, a = 15.7080(12) A, b = 17.1023(16) A, c = 21.006(2) A, V= 5643.1(9) A3, and Z = 8. The Fe" ions are (at both temperatures) octahedrally surrounded in a mer-configuration. The complex has been subjected to both 57Fe Mössbauer spectroscopy and magnetic susceptibility measurements. The 57Fe Mössbauer spectrum shows the presence of two different iron(II) sites. The high-spin fraction vs. T curve of the crossover, obtained by SQUID measurements, is gradual and without hysteresis, with T1/2 = 135 K.
AB - The synthesis and characterization of tris[3-(pyridin-2-yl)1,2,4-triazole]iron{II) bis(tetrafluoroborate), obtained from the reaction of 3-(pyridin-2-yl)-1,2,4-triazole (Hpt) and hexaaquairon(II) tetrafluoroborate, [Fe(H2O)6](BF4)2, is described, together with its crystal structures at two temperatures. Xray crystallographic parameters are as follows: [Fe(Hpt)3](BF4)2-nH2O (n = 2) at 250 K: orthorhombic space group Pbam, a - 15.8068(18) A, b = 17.2800(14) A, c = 21.215(2) A, V = 5794.7(10) A3, and Z = 8. [Fe(Hpt)3](BF4)2-nH2O (n = 2) at 95 K: orthorhombic space group Pbam, a = 15.7080(12) A, b = 17.1023(16) A, c = 21.006(2) A, V= 5643.1(9) A3, and Z = 8. The Fe" ions are (at both temperatures) octahedrally surrounded in a mer-configuration. The complex has been subjected to both 57Fe Mössbauer spectroscopy and magnetic susceptibility measurements. The 57Fe Mössbauer spectrum shows the presence of two different iron(II) sites. The high-spin fraction vs. T curve of the crossover, obtained by SQUID measurements, is gradual and without hysteresis, with T1/2 = 135 K.
KW - Iron
KW - Magnetic properties
KW - Moessbauer spectroscopy
KW - N ligands
KW - Spin crossover
UR - https://www.scopus.com/pages/publications/0033774867
U2 - 10.1002/1099-0682(200010)2000:10<2231::AID-EJIC2231>3.0.CO;2-B
DO - 10.1002/1099-0682(200010)2000:10<2231::AID-EJIC2231>3.0.CO;2-B
M3 - Article
AN - SCOPUS:0033774867
SN - 1434-1948
SP - 2231
EP - 2237
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 10
ER -