Magnetic Study Of Hybrid Cyanide-bridged Compounds

The molecule-based magnetic materials are the useful molecule-framed complexes consisting of the molecular or electrified molecular. People have synthesized a lot of Prussian Blue analogues which refer to a series of complexes with the formula of CnAP[B(CN)₆]_q·xH₂O. people gain different structural complexes with the hybrid method is that using transition metal Ion complex MLⁿ⁺ (L organic ligand) instead of simple metal ions reacting with components B(CN)₆^m-(collectively refer to hybrid cyanide-bridged compounds). The advantages of such methods are given as follows: on the one hand because the organic groups have increased with the solubility, we easily gain the crystal expediently with magnetic and relevant study. On the other hand, with the transformation of the L type organic ligand, the change of the environment around metal ions can easily regulate the lattice-magnetic interaction between the ions. In the design of hybrid Prussian Blue analogue molecular magnets we can synthesize novel, soluble, easily processing and crystal practical molecular magnets with organic and inorganic chemical methods through changing the organic ligand. While Prussian blue molecule-based magnets can not be achieved. In the present paper, the M?ssbauer measurements, magnetic measurements and structural measurements are performed to study the magnetic properties, microstructure and magnetic coupling mechanism in molecular magnets based on hybrid cyanide-bridged compounds. The main results are given as follows:(1)A bimetallic rope-ladder chain structure compound [Ni(en)₂]₃[Fe(CN)₆]₂·2H₂O was synthesized, which was investigated by Mossbau spectroscopy in the cooling processes. Mossbauer studies show that the electronic state of iron is mostly low-spin er Fe³⁺ ,big QS value in the low temperature indicates the occurrence of the distortion of [Fe(CN)₆]^3- symmetrical structure unit in this compound, the magnetic relaxation M?ssbauer spectra in the low temperature testifies the ferromagnetic coupling between metal ions.(2)A two-dimensional network layer compound [{Fe(Salen)}₃{Fe(CN)₆}(MeOH)₂]_n 3H2O was synthesized by the solution method. The magnetic study(field-cooled magnetization and zero-field cooled magnetization VS T, effective moment VS T) indicates the onset of a magnetic ordering. Comparing with the magnetic of two other two-dimensional network layer compounds, it is concluded that the magnetic properties of this kind of layer compound is affected greatly by interlayer separation.Eventually, we summarize the work of the paper and envisage the coming study of molecular magnets based on hybrid cyanide-bridged compounds.