Magnetic order in urea-based Mn2-Nb(CN)8 chiral molecular magnetand in its non-chiral counterpart
The proposal considers two 3D molecular magnets: optically active chiral [Mn(urea)2(H2O)]2[Nb(CN)8], Tc = 43 K (sample A) and the non-chiral [Mn(H2O)2]2[Nb(CN)8].4H2O of Tc = 47 K (sample B). The compounds belong to the TII-L-[Nb(CN)8] family, (T = Mn, Fe Ni, L = nonmagnetic organic ligand) which shows various type of functionalities. The structure is tetragonal, space group for A is P41 and for B - I4/m. A and B are soft ferrimagnets with magnetization of saturation at T= 2 K equal to 9 Bohr magnetons permol. Our plan is to determine the order of magnetic moments below the transition temperature for both compounds. We apply for 2 days at the D20 diffractometer, lambda=2.4 Å, T=300 K, 2 K, 20 K, 30 K, 40 K, 50 K and 150 K. Due to the crystallographic complexity, data should be taken with the Soller collimator to assure good resolution. For the neutron diffraction experiment samples A and B will be prepared in the deuterated form and checked with XRD, magnetic and IR measurements.
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BALANDA Maria; BUDZIAK Andrzej; FITTA Magdalena; Thomas C. Hansen and KONIECZNY Piotr. (2013). Magnetic order in urea-based Mn2-Nb(CN)8 chiral molecular magnetand in its non-chiral counterpart. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2284
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