Structures of three crystals containing approximately — linear chains of triiodide ions
Abstract
The structures of the ordered crystals of tetra(n-butyl)ammonium triiodide [I:a = 15.791(8),b = 15.993(8),c = 9.578(5)Å,α = 74.48(8)°,β = 101.52(9),γ = 96.63(9)°,P[unk],Z =4)] and (benzamide)2 · HI3; [II:a = 20.824(10),b = 9.874(5),c = 9.620(5) Å,α = 95.58(9),β = 102.10(10),γ = 94.72(9)°,P[unk],Z=4] have been fully refined, while that of caffeine · H2O · HI3 [III:a = 14.043(5),b = 12.202(5),c = 9.701(5)Å,β = 106.5(1),P21/a,Z = 4] has been determined in outline because of unresolved problems of disorder. Intensity measurements were made on a four-circle diffractometer using graphite-monochromated MoKα. The numbers of reflections used in the final refinement cycle were: 15370, II5295, III 2971.I has cations ofD2d symmetry (i.e. in the form of flattened crosses) which interleave to form channels of rectangular cross-section with axes along [001]; these channels containsingle, almost-linear chains of triiodide ions, with weak I[unk] – I[unk] interactions within the chains. II is a pseudo-Type A basic salt, with pairs of benzamide molecules, (joined by a short, presumably symmetrical, proton bond between carbonyl groups) forming the cations; these cations are arranged so as to leave channels (axes along [001]) of rectangular cross-section which containdouble, almost-linear chains of triiodide ions. In III the caffeine molecules are presumably protonated at N(9) and are hydrogen bondedvia water molecules to form corrugated sheets, the molecular plane being in the sheets. These sheets are so disposed as to leave channels of rectangular cross-section which containdouble chains of polyiodide ions. One of the three iodines is disordered along the chain direction and it was not possible to identify the nature of the chains ( –I[unk]
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Articles in the same Issue
- Die Kristallstruktur von synthetischem Ammoniumtetraboratdihydrat, (NH4)2[B4O5(OH)4]·2H2O
- Structures of three crystals containing approximately — linear chains of triiodide ions
- Graph-theoretic construction of periodic bond chains II. Ionic case
- Neutron diffraction study of alums L The crystal structure of hydroxylammonium aluminium alum L The crystal structure of hydroxylammonium aluminium alum
- Structure cristalline de l'octamolybdate de 3-ethyl pyridinium ápolyanions discrets [MO8O26]4−
- The structure of hydrohematite
- Verfeinerung der Kristallstrukturen von Li2SiO3 und Li2GeO3
- Crystal and molecular structures of (l)acetatobis(acetone S-methylthiosemicarbazone)cobalt(II) iodide and (2)acetato-bis(acetone S-methylthiosemicarbazone) nickel(II) iodide*
- The frameworks of sodalite-like structures and of tetrahedrite-like structures1
- Crystal structure of beryllium polyphosphate BeP2O6 III – a derivative of silica K (keatite)
- Optical, electrooptical and piezoelectric constants ofd( + )-camphoric acid acetone
- Beobachtung einer Wachstumsinstabilität durch Kathodolumineszenz
- The crystal structures of yttrium, holmium and erbium formate dihydrates*
- Gas-flame, high-temperature apparatus for single-crystal X-ray diffraction studies
- Crystal and molecular structure of bromobis(N,N’-dibenzylethylenediamine)copper(II) bromide
