Structural characterization, vibrational and optical properties of a novel one-dimensional organic–inorganic hybrid based-iodobismuthate(III) material, [C10H7NH3]BiI4

Structural characterization, vibrational studies and optical properties of a new luminescent organic-inorganic material [C6H20N3]BiI6·H2O

“…The absorption peaks found in the absorption spectrum are very similar to those observed in other organice inorganic hybrid materials containing [BiI 6 ] 3À anions described in literature [7,24,25]. The absorption peak at 2.78 eV is consigned to an electronic transition between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) [31,32], while the second absorption band at 2.27 eV is due to the exciton created in the inorganic [BiI 6 ] 3À anions [33].…”

“…Actually, it shows two red luminescence bands, that could be observed even with the naked eye, at room temperature; a broad one with a peak at 2.05 eV(604 nm) and a weak one with a peak at 1.87 eV (662 nm). These emission peaks may be attributed to the electronic transitions within the iodobismuthate inorganic part [BiI 6 ] 3À [31,34,35]. In the halobismuthate (III) based hybrids, the lowest exciton state arises from excitations between the valence band consisting of mixture of Bi(6s) and I(5p) states and the conduction band which derives primarily from Bi(6p) states.…”

“…The recombination of the electron and a hole in the exciton yields a red emission at 604 nm. The Stokes shift between absorption at 2.27 eV and the emission at 2.05 eV is rather large (220 meV) [31,35,36] and mainly due to the exciton binding energy and the low dimensional (0D) structure.…”

“…It can be clearly seen that the band gap energies of zero-dimensional isolated octahedron takes place at a higher energy (E g ¼ 2.78 eV) in (C 6 H 20 N 3 )BiI 6 $H 2 O and (E g ¼ 2.90 eV) in (CH 3 NH 3 ) 3 Bi 2 I 9 [29] than those of the corresponding octahedra which may share corners, edges or faces (C 10 H 7 NH 3 )BiI 4 (E g ¼ 2.32) [31] and (C 6 H 18 N 2 )BiI 5 (E g ¼ 2.48 eV) [37]. Besides, the band gap energies occurs at substantially weaker energy compared to those found in the homologous bromide compound which has the same organic molecules as our (C 6 H 20 N 3 )BiBr 6 $H 2 O (E g ¼ 3.10 eV) [9].…”

Synthesis, crystal structure, thermal analysis, and electrical properties of bis tetrapropylammonium hexachloro-dizincate compound

“…The prospect of creating new functional materials with tunable properties gives a strong motivation on the research of organic-inorganic hybrids [1,2]. Interest in these compounds has grown due to their remarkable structural and physical properties like ferro-electricity, ferro-elasticity, and low-dimensional magnetism [3][4][5].…”