Di‐Benzo‐18‐Crown‐6 and its Derivatives as Ligands in the Search for Ion Channels

Abstract

Abstract. Based on the previously reported one-dimensional chan-, which is realized by stacking of crown ether molecules (DB18C6 ϭ dibenzo-18-crown-6), other synthetic approaches towards ionic channels and their results are presented in this paper. The "cutting out" approach using DB18C6 as scissor, applied on NaI, yields the compound [Naʚ(DB18C6)I(THF)]-[Naʚ(DB18C6)(H 2 O) 2 ]I(THF) 2 (CHI 3 ) (1), in high yield. It is based on a neutral and a cationic complex of sodium by DB18C6 linked via H-bonding to give short chain fragments. The anion exchange approach, trying to replace I 3 Ϫ by Br 3 Ϫ leads to the intercalation

Recent Discoveries of Polyhalogen Anions – from Bromine to Fluorine

“…The shortest distance is the bond contact of the interconnected bromine molecule with 230.8 and 235.4 pm in [BzPh 3 P] 2 [Br 8 ] and [Q] 2 [Br 8 ], respectively. Fromm et al also reported on a crown ether salt [H 3 O(Br 4 ‐dibenzo‐18‐crown‐6)][Br 3 · Br 2 ] 54. This description is not in accordance with the reported crystal structure and therefore better described as [H 3 O(Br 4 ‐dibenzo‐18‐crown‐6)] 2 [Br 8 ] 55…”

Polyhalogen and Polyinterhalogen Anions from Fluorine to Iodine

“…Later, Fromm et al. also reported the salt [H 3 O(Br4‐dibenzo‐18‐crown‐6][Br 3 ⋅Br 2 ] . Although the stoichiometry is correct, the polybromine dianion present in the crystal structure is clearly [Br 8 ] 2− .…”

Structural analysis of the microporous semiconductor K-SBC-1 during its reversible sorption of water

“…This distance is hence somewhat shorter than a standard intermolecular distance of 2.8 Å between oxygen atoms of two neighbouring water molecules (r(O) ¼ 1.4 Å ). However, a number of structures have been reported to show O-O distances between neighbouring water molecules in the range of 2.0-2.4 Å [11][12][13].…”