Three-dimensional space groups two-dimensional hyperbolic orbifolds and 'sponge' groups

S. T. Hyde, S. Ramsden, V. Robins
2011 Acta Crystallographica Section A Foundations of Crystallography  
The external perturbations can be temperature, light irradiation, pressure, and pulsed magnetic fields all may change the magnetic coupling interaction in transition metal systems. Here, we use pressure as external force to study magneto -structural correlation. We report here the structure and magnetic behavior of one 1-D helical chain iron complex [FeII(μ-bpt)(μ-COOC 5 H 4 N)‧1/2 H 2 O] n (bpt=3,5bis (pyrid-2-yl)-1,2,4-triazole), [1], in ambient conditions and under hydrostatic pressure. The
more » ... omplex was crystallized in a tetragonal space group I4 1 /a at ambient pressure, each iron atoms linked by one bpt and one isonicotinic acid legend, which form an infinite helical chain along the screw axis 4 1 at c-axis direction. The iron atoms are iron (2+) high spin state with distorted N4O2 coordinated shell. High-pressure powder X-ray diffraction experiments from 0.03GPa to 2.79GPa pressure were carried out to understand precisely the correlation between the structure and magnetic behavior. The careful analysis of a series high pressure structures showing a pressureinduced shrinking more than 10% along the chain direction, which can describe as spring compressed 10%. This make the iron-iron distance from 4.445(2) Å at ambient pressure change significantly to 4.083(6) Å at around 2GPa. Magneto -structural correlation will be discussed .The coordinated shells of Iron (N4O2) also decrease 0.11 Å about averagely. The spin state of iron and magnetic property of title compound also will be shown in this report [1] S-M Chen, Structure
doi:10.1107/s0108767311091641 fatcat:tnd425xr25bifagt4pdzcmba2y