Related Experiment Video
Updated: Dec 28, 2025
Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Multinary Halogenido Bismuthates beyond the Double Perovskite Motif
Natalie Dehnhardt1, Hayden Paneth2, Nikolas Hecht3
1Department of Chemistry and Material Sciences Center, Philipps-Universität Marburg, 35043 Marburg, Germany.
Abstract:
Both lead halide perovskites and bismuth-based double perovskites have generated intense research interest in the past few years. There is, however, a broader class of bismuthates that transcends the double perovskite motif. These multinary halogenido bismuthates remain severely underexplored and offer rich research opportunities with regard to new structure motifs and material properties. In this Forum Article, we want to provide both an overview of the work on this class of compounds that has been done in the last 2 decades and an example of how new compounds can be obtained and which challenges are associated with their synthesis. We present the synthesis and characterization of six new bismuthates, (PBz4)3Bi3Br12 (1) (PBz4)2(MeCN)2Cu2Bi2Br10 (2), (PBz4)Bi2I7 (3), (PBz4)2(MeCN)2Cu2Bi2I10 (4), (PBz4)2AgBi2I9 (5), and (PBz4)3Bi3I12·C4H8O (6), based on the tetrabenzylphosphonium cation PBz4+. 2, 4, and 5 represent new multinary bismuthates, featuring both a familiar anion motif with a new element combination in 2 and a previously unknown anionic chain in 5. We use this series of compounds to further elucidate the influence of the anion composition, nuclearity, and dimensionality on the compounds' onset of absorption and discover that an additional factor, the connectivity between coordination polyhedra, plays a role in copper iodido bismuthates.
More Related Videos
Related Concept Videos
02:42Valence Bond Theory
02:34Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
04:01VSEPR Theory and the Effect of Lone Pairs
02:46Halogenation of Alkenes
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
02:42Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...