HYDROTHERMAL SYNTHESIS AND CRYSTAL-STRUCTURES OF THE NOVEL MANGANESE(II) THIOANTIMONATES(III) MN2SB2S5(CH3NH2)(2) AND MN2SB2S5(NH2(CH2)(3)NH2) - LAYER COMPOUNDS EXHIBITING HETERO-CUBANE LIKE BUILDING UNITS

The two new manganese(II) thioantimonates(III) Mn2Sb2S5(CH3NH2)(2) and Mn2Sb2S5(NH2(CH2)(3)NH2) were prepared under mild hydrothermal condit ions. The crystal structures of both compounds are characterized by Mn 2Sb2S4 hetero-cubane like building units developed by the interconnect ion of SbSx polyhedra and MnX(6) octahedra. The linkage of ten hetero- cubanes leads to the formation of large rings with an ellipsoidal shap e. The diameters of these rings are 4.869 Angstrom x 7.696 Angstrom an d 5.159 Angstrom x 7.526 Angstrom, respectively. The rings are joined to form layers in the (100) plane. Channels running parallel to the a axis are developed by stacking the layers onto each other. Due to the geometrical requirements, distinct bonding properties and spatial dema nds of the amine ligands one of the two crystallographically independe nt MnX(6) octahedra is drastically distorted, and in the 1,3-diaminopr opane compound a 5+1 coordination for the Mn center results.