A new polymorph telluridoindate [In(en)3][In5Te9(en)2] with photocatalytic properties

Abstract: A new polymorph telluridoindate [In(en)3][In5Te9(en)2] (denoted as β-type, en=ethylenediamine) has been solvothermally synthesized and characterized. The crystal data for the β-type are listed as follows: monoclinic, space group Cc (No. 9), a =11.642(2), b =20.421(4), c =17.577(4)Å, β =92.20(3)°, V =4175.7(14)Å3, Z=4. The β-type contains organic-decorated [In4Te9(en)]6− supertetrahedral cluster and [InTe3(en)]3− tetrahedron, which are interconnected to form an organic-decorated 2-D telluridoindate layer of [In5Te9(en)2 3−]n with 9-membered rings. Two relevant conformers of telluridoindates are compared with each other. The β-type indicates absorption edge at 2.23eV and exhibits photocatalytic activity for degradation of methyl orange (MO). [Copyright &y& Elsevier]