A novel 3-D thioindate-thioantimonate based on the linkages of large heterometallic {In₂Sb₂S₉} clusters and 1-D [In₂Sb₂S₈⁴⁻]_n chains

A novel 3-D thioindate-thioantimonate [(Co(en)₃)]₃(en)In₆Sb₆S₂₁·H₂O (1, en = ethylenediamine) has been solvothermally synthesized and characterized by elemental analysis, thermogravimetric analysis, IR, UV/Vis, fluorescence spectroscopy, powder X-ray diffraction and single crystal X-ray diffraction. 1 contains large heterometallic {In₂Sb₂S₉} clusters and 1-D [In₂Sb₂S₈⁴⁻]_n chains, which are interconnected to form a new 3-D In–Sb–S framework with large 20-ring channels. 1 exhibits strong blue luminescence with the emission maximum occurring around 455 nm.