New molecular composites: Pyridine derivatives as guest molecules encapsulated within the cavities of the three-dimensional supramolecular complexes - [(R3Sn)(3)Fe(CN)(6)](n), R = Ph or n-Bu

Spontaneous self assembly reaction of [-Fe(CN)(6)](3-) building blocks and R3Sn+ ions (R = alkyl or aryl) affords three-dimensional (3D) supramolecula r [(R3Sn)(3)Fe(CN)(6)](n) products, which were confirmed by different spect ral data. The architecture of these supramolecular complexes involve guest- free cyanide-bridged 3D neutral networks They are composed of nearly planna r R3Sn+ units, linked together with slightly distorted octahedral building blocks [-Fe(CN)(6)](3-) through the cyanide N atoms. Pyridine compounds, ac ting as guest donors, have been successfully encapsulated within the expand able wide cavities of the 3D-supramolecular complexes by tribochemical reac tions. This produces novel charge transfer molecular composites. The proper ties of the resulting molecular composites were investigated by elemental a nalyses, IR, UV-visible, X-ray powder diffraction, EPR and magnetic moments . The interesting feature of these molecular composites are their semicondu ctive properties.