Structural Phase Transition without Accompanied Spin Transition of Complex t-{Fe(abpt)(2)[N(CN)(2)](2)}
Resource
JOURNAL OF THE CHINESE CHEMICAL SOCIETY, 57, 783-789
Journal
Journal of the Chinese Chemical Society
Pages
783-789
Date Issued
2010
Date
2010
Author(s)
Sheu, Chou-Fu
Chuang, Yu-Chun
Liu, Yi-Hung
Sheu, Hwo-Shuenn
Wang, Yu
Abstract
A reversible crystal-to-crystal structural phase transition is found in one of the polymorphs (A) of complex t-{Fe(abpt)2[N(CN) 2]2} (abpt = 4-Amino-3,5-bis (pyridin-2-yl)-1,2,4- triazole). The crystal at 25 K remains unchanged as triclinic space group P -1 from that of the ambient temperature, but with different cell parameters: a = 8.7960(6), b = 8.8110(9), c = 10.1020(7) Å, α = 94.146(8)°, β = 93.296(6)°, γ = 114.460(7)°, V = 707.48(10) Å3. Thermal-dependent powder X-ray diffraction reveals a first order phase transition with transition temperature, T 1/2, at 270 K, which coincides with the change in cell parameters monitored by single crystal diffraction experiment. The molecular structure does vary on the orientation of the axial ligand, N(CN)2, during the phase transition, however the Fe-N bond distance and the octahedron distortion parameters around Fe indicate that Fe remains at high spin state even after the phase transition which is in accord with the observed thermal-dependent magnetic measurement.
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journal article
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