A New Metastable Three-Dimensional Bismuth Sulfide with Large Tunnels: Synthesis, Structural Characterization, Ion-Exchange Properties, and Reactivity of KBi3S5

Generation and Trapping Reactions of a Formal 1:1 Complex between Singlet Carbon and 2,2′-Bipyridine

“…This coupling constant almost corresponds to sp hybridization of the C atom in this bond (the exact value is sp 1.15 ). [8] A PM3 calculation, combined with an NBO analysis, [9] provided a hybridization of sp 1.23 . This unprecedented result can also be reached qualitatively by applying Bents rules: [10] The carbon atom bridging the sixmembered rings in 4 (ªbridging C atomº) has two strongly electronegative substituents (the N centers), which should induce a higher p character in the C hybrid orbitals associated with them.…”

“…The 1 H ± 13 C coupling constant of 170.65 Hz for the geminal C À H bonds corresponds to sp 1.93 hybridization in these bonds, which is highly unusual for a saturated C atom. [8] Salt 4-Br was deprotonated to the neutral species 5 in a fast and quantitative reaction with KOtBu in THF at À 30 8C (Scheme 2). Under these reaction conditions, 5 was stable for several hours.…”

LiBi3S5—A lithium bismuth sulfide with strong cation disorder

“…This class of compounds has proven to be remarkably large and has contributed many complex compositions and structures favorable for high thermoelectric performance [3], e.g., K 2.5 Bi 8.5 Se 14 [4], β-K 2 Bi 8 Se 13 [4], A 2 Bi 8 Se 13 (A = Rb, Cs) [5], and CsBi 4 Te 6 [6]. In comparison to selenides and tellurides, most of the alkali-metal bismuth sulfides exhibit wide energy band gaps and strong ionic interactions between the alkali-metal ions and the [Bi x S y ] z-framework, e.g., in β-and γ-CsBiS 2 [7], γ-RbBi 3 S 5 [8], and KBi 3 S 5 [9]. Because of these characteristics, further compounds of this class are sought after.…”

KCu0.9Bi2.7S5: New Semiconducting Quaternary Bismuth Sulfide

“…5,6 Furthermore, fundamental interest in these compounds is growing due to their structural diversity they exhibit. For example, the compounds of a general formula of ABi 3 Q 5 (A=K, Rb, Cs; Q=S, Se, Te) [7][8][9][10][11] are known to have six different structure types. The polymorphism is made possible by subtle changes in the edge-sharing modes between the infinite BiQ 6 (Q=S, Se) octahedral chains found in the frameworks.…”