Three inorganic–organic hybrids of bismuth(III) iodide complexes containing substituted 1,2,4-triazole organic components with charaterizations of diffuse reflectance spectra

The reactions of two kinds of substituted 1,2,4-triazoles with BiI3 yielded three inorganic–organic hybrids: [HL1]4[Bi6I22]·[L1]4·4H2O (1) (L1=3-(1,2,4-triazole-4-yl)-1H-1,2,4-triazole); [HL2]4[Bi6I22]·6H2O (2); [HL2]2[Bi2I8]·[L2]2 (3) (L2=(m-phenol)-1,2,4-triazole). Both 1 and 2 have polynuclear anions of [Bi6I22]4– to build up the inorganic layers and substituted 1,2,4-triazoles as the organic layers. Hybrid 3 consists of two BiI5 square pyramids as inorganic layers. There exist hydrogen bondings and I⋯I interactions in the structures of 1, 2 and 3. Optical absorption spectra of 1, 2 and 3 reveal the presence of sharp optical gaps of 1.77, 1.77 and 2.07 eV, respectively, suggesting that these materials behave as semiconductors.

Graphical abstractThe reactions of two kinds of the substituted 1,2,4-triazoles with BiI3 yielded three layered inorganic–organic hybrids [HL1]4[Bi6I22]·[L1]4·4H2O (1), [HL2]4[Bi6I22]·6H2O (2), [HL2]2[Bi2I8]·[L2]2 (3) with optical gaps of 1.77, 1.77 and 2.07 eV, respectively. The structures of 1–3 are constructed from inorganic layers of polynuclear anions of bismuth iodine and organic layers of the substituted 1,2,4-triazoles.Figure optionsDownload full-size imageDownload as PowerPoint slide