Related Experiment Video
Updated: Jan 16, 2026
Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers
Published on: September 27, 2018
(C7H10N)3Bi2I9·I2: Synergistic Cooperation of π-Conjugated Cations and Distorted [BiI6] Octahedra Enabling a Large
Dingxuan Zhao1, Shihui Ma1, Jiajia Wang2
1State Key Laboratory of Crystal Materials, Institute of Functional Crystal, Tianjin University of Technology, Tianjin 300384, China.
None:
Birefringent crystals can modulate the polarization of light and have important applications in optoelectronic and photonic fields in the infrared optical communication band. However, existing birefringent crystals exhibit a significant decrease in birefringence (Δn ≤ 0.26) in the infrared waveband due to the dispersion effect. Herein, we designed a new organic-inorganic hybrid halide (C7H10N)3Bi2I9·I2, which possesses a layered structure with π-conjugation cations. Though the structure has a stereochemical inert lone pair Bi3+, the compound exhibits a large birefringence of 0.39@589 nm (sodium D-line), which is consistent with the theoretical calculations of 0.386@589 nm. Remarkably, first-principles calculations reveal that it still maintains a large birefringence of 0.42@1064 nm and 0.32@1550 nm. This can be attributed to the highly distorted nature of the π-conjugated 1-ethylpyridinium cation and the significant distortion of the BiI6 octahedra. This work highlights the persistently neglected potential of organic-inorganic hybrid halide materials as birefringent crystals.
More Related Videos
06:44From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
09:09A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
Published on: March 29, 2019
Related Concept Videos
02:42Valence Bond Theory
02:52Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
03:24Hybridization of Atomic Orbitals I
03:35Hybridization of Atomic Orbitals II
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...
01:27¹H NMR: Long-Range Coupling
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...