A cyclic I₁₀ ²⁻ anion in the layered crystal structure of theophyllinium pentaiodide, C₇H₉I₅N₄O₂

Abstract

C7H9I5N4O2, monoclinic, P21/c (no. 14), a = 9.46793(10) Å, b = 11.58276(12) Å, c = 16.41497(18) Å, β = 100.844(1)°, Z = 4, V = 1768.00(3) Å3, Rgt(F) = 0.0306, wRref(F2) = 0.0728, T = 130(2) K.

Crystal structure of bis(1,3-phenylenedimethanaminium) bis(triiodide) tetraiodide – water (1/2) , C8H16I5N2O

“…There are new considerations that suggest they might have anti-microbial properties [14]. A well established field of research is the synthesis of new polyiodide-containing salts based on organic cations [15]. We have already shown that the lengths and shapes of cations influence or even determine the topology of the embedded polyiodide anions [16][17][18][19] and the inclusion of neutral iodine molecules [20,21].…”

“…The asymmetric unit of the title structure contains one 1,3-phenylenedimethanaminium dication, one discrete triodide anion, one half of a I4 2− anion as well as a water molecule (left part of the figure). In order to avoid any confusion with true pentaiode salts [15] the more structured compound name bis(1,3-phenylenedimethanaminium) bis(triiodide) tetraiodide -water (1/2) is used. Bond lengths and angles in the cation are in the range of expectation [28][29][30].…”

Synthesis and structures of polyiodide radical cation salts of donors combining tetrathiafulvalene with multiple thiophene or oligo-thiophene substituents

“…Some similar cyclic "I 10 2− " units have been reported before but are closer to assemblies of triiodide and iodine. 21 In contrast, tetramethylammonium pentaiodide form a network containing "squares" with twelve iodine atoms. 22 Within the bithiophene units the thiophene rings are organised predominantly in trans mode with angles of 25.2 and 26.9°b etween the planes of the two rings, though one terminal ring has 72 : 28 trans : cis rotational disorder.…”

Hydrogen bonding versus packing effects in the crystal structure of 3-((1R,2S)-1-methylpyrrolidin-1-ium-2-yl)pyridin-1-ium tetraiodidozincate(II), C10H16I4ZnN2

“…As a result of the database survey specified above, only a limited number of examples of salt structures containing doubly protonated nicotinium cations have been reported so far [7][8][9][10][11][12]. This contribution is part of our continuing interest in synthesis, characterization and understanding of hydrogen-bonding schemes of salts of natural products [7,[11][12][13][14]. The choice of a [ZnI4] 2− counter anion is part of our general interest in halogen bonding interactions between iodine containing molecules and ions, regardless of whether they are attractive or repulsive [15][16][17].…”