(HPy)₂(Py)CuBi₃I₁₂, a low bandgap metal halide photoconductor

Abstract

A new copper iodido bismuthate with a low band gap of 1.59 eV and good thermal and air stability was prepared via a simple solution-based route.

Copper- and Silver-Containing Heterometallic Iodobismuthates: Features of Thermochromic Behavior

“…A comparison of the structural types of one-dimensional copper and silver iodobismuthates is presented in Figure 5 . The most common isomer of [{Bi 2 Ag 2 I 10 } n ] 2n− is represented by six compounds [ 25 , 26 , 41 , 42 ], while the least common types are represented by only one example each [ 20 , 28 ].…”

“… Overview of one-dimensional anions of copper and silver iodobismuthates and their band gaps in eV taken from literature (Feldmann, 2001 [ 20 ]; Chai, 2007 [ 25 ]; Chai, 2007 [ 26 ]; Möbs, 2020 [ 28 ], Möbs, 2022 [ 27 ]; Shentseva, 2022 [ 41 ], Shentseva, 2022 [ 42 ]). In compound from [ 20 ] ( top left ), the band gap for copper iodobismuthate was not provided.…”

“…Amongst the wide variety in the studied materials, prepared through various approaches, one promising method for altering electronic properties and developing new materials should be particularly emphasized: the combination of p - and d -elements ( d -elements typically being copper and silver) in the anion. According to this strategy, heterometallic copper- and silver-containing iodobismuthates with zero-dimensional [ 19 , 20 , 21 , 22 , 23 , 24 ], one-dimensional [ 20 , 25 , 26 , 27 , 28 ] ( Figure S1 ) or two-dimensional [ 29 , 30 ] anionic motifs have been characterized previously. However, the overall number of known heterometallic iodometallates remains lower than that of homometallic ones, but this trend can change, as recent works clearly demonstrate [ 27 , 31 , 32 , 33 , 34 ].…”

Synthesis and Characterisation of Iodobismuthates Containing N-substituted 1,4-Diazabicyclo[2.2.2]octane

“…Examples include [MV][BiI 5 ] (where MV 2+ = methyl viologen), which contains one-dimensional chains of corner-sharing [BiI 6 ] 3− octahedra and exhibits a band gap of 1.48 eV [34], and [C 3 H 5 N 2 S][BiI 4 ], which has a band gap of 1.78 eV and contains one-dimensional chains of edgesharing octahedra [52]. Incorporation of additional metals to form ternary iodobismuthates, such as [HPy] 2 [Py][CuBi 3 I 12 ] (where Py = pyridine) which has a band gap of 1.59 eV [53], may provide an alternative approach to achieve significant reductions in the band gap [54].…”

Copper and silver heterometallic iodoantimonates: structure, thermal stability, and optical properties

“…26 This topic is covered in many studies specifically focused on Bi(III) compounds. [27][28][29][30][31][32][33][34] Unfortunately, known examples of heterometallic halide iodoantimonates are quite scarce. A brief search in Cambridge Crystallographic Data Centre (CCDC) gives eight examples: six Sb/Cu heteroleptic heterometallic hybrids [35][36][37] three tris-o-(tolyl)phosphine-templated compounds with the anion formula [Sb a I b (Cu(P(o-Tol) 3 ) c )], 35 two solvent-coordinated compounds [PPh 4 ] 2 [SbCu 2 I 7 (L)] 36 (L = acetonitrile, propionitrile), and four-centered [SbCu 3 I 6 (PPh 3 ) 6 ].…”