Abstract
Iron containing tellurostannates [Fe(dien)2]2Sn2Te6 (dien = diethylenetriamine) (1), [Fe(tepa)(N2H4)]2Sn2Te6 (tepa = tetraethylenepentamine) (2), and [{Fe(trien)}2(μ-1κ:2κ-SnTe4)] (trien = triethylenetetramine) (3) were solvothermally prepared in different ethylene polyamines with the assistance of hydrazine in lower temperature range. In 1 and 2, two SnTe4 tetrahedral units are joined via edge-sharing forming a free dimeric [Sn2Te6]4− anion with Fe(II) complex cation acting the counter ion. In compound 3, the SnTe4 tetrahedron connected two [Fe(trien)]2+ complex units as a bidentate μ-1κ:2κ bridging ligand, to generate the neutral binuclear complex [{Fe(trien)}2(SnTe4)]. The compounds 1–3 had narrow semiconducting band gaps of 1.76, 1.73 and 1.71 eV, respectively. They showed sensitive photocurrent response under Xe light irradiation with steadied current densities in the range of 0.45–0.76 μA·cm−2. They were catalytically active in the photodegradation of crystal violet (CV) with the degradation ratio varying between 59.5% and 93.5%. Compound 3 exhibited the highest photocatalytic activity, which was attributed to its highest strength of photocurrent response.
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