[Ba(Benzo-15-Krone-5)2](In)2: Darstellung und strukturelle Charakterisierung eines Triiodids (n = 3) und eines Heptaiodids (n = 7)

Abstract

Inhaltsübersicht. [Ba(Benzo-15-Krone-5) 2 ](I 3 ) 2 und [Ba(Benzo-15-Krone-5) 2 ](I 7 ) 2 lassen sich durch Umsetzung von Benzo-15-Krone-5 (C 14 H 20 O 5 ), Bariumiodid (BaI 2 ) und Iod (I 2 ) in Ethanol/Dichlormethan in kristalliner Form gewinnen. Das Triiodid besteht aus einem sandwichartigen Kation [Ba(Benzo-15-Krone-5) 2 ] 2ϩ und einem linear symmetrischen Anion I 3 Ϫ , das als isolierte Einheit vorliegt. Das ungewöhnliche I 7 Ϫ -Anion im Heptaiodid entspricht in [Ba(benzo-15-crown-5) 2 ](I n ) 2 : Synthesis and Crystal Structure of a Triiodide (n ‫؍‬ 3) and a Heptaiodide (n ‫؍‬ 7) Abstract. [Ba(benzo-15-crown-5) 2 ](I 3 ) 2 and [Ba(benzo-15-crown-5) 2 ](I 7 ) 2 can be obtained in crystalline form by reacting benzo-15-crown-5 (C 14 H 20 O 5 ), barium iodide (BaI 2 ), and iodine (I 2 ) in ethanole /dichloromethane. The triiodide consists of a sandwich-like cation [Ba(benzo-15-crown-5) 2 ] 2ϩ and an isolated symmetrically linear I 3Ϫ anion. The unusual I 7 Ϫ anion in the heptaiodide can be described as a V-shaped pentaiodide unit, which is connected with a Einleitung

Perfluorocarbon-hydrocarbons self-assembly: halogen bonding mediated intermolecular recognition

“…The I À Á Á Á IÀCÀ angle is 177.3(1)8 and the I À Á Á Á IÀPFC halogen bonding length is 3.391(1) Å , longer than the average covalent IÀI bond (2.666 Å ) and once again approximately 0.8 times the sum of van der Waals radii for iodine atom and iodide ion. A strictly related crystalline organisation has been recently described by Pantenburg et al [63] for the complex [Ba(benzo-15-crown-5) 2 2þ ](I 3 À ) 2 . This confirms the suggestion the tecton Á Á Á IðCF 2 Þ n I Á Á Á I À functions as a fluorous analogue of the triiodide building block.…”

Bis(benzo-15-crown-5-κ5O)strontium bis(triiodide)

“…For related literature, see: Pantenburg et al (2002); Walbaum et al (2007) and references cited therein. For bond-length data, see: Allen et al (1987).…”

“…[Sr(benzo-15-crown-5) 2 ](I 3 ) 2 is isotypic with the respective Ba compound (Pantenburg et al, 2002). The Sr 2+ ion (2a; 1,0,1) is located slightly above the centre of two benzo-15-crown ligands and coordinated in a sandwich-like manner by ten O atoms.…”