96750-40-2Relevant academic research and scientific papers
Polyhalide anions in crystals. Part 2. I3- asymmetry and N-H...I bonding: Triiodides of the Me2NH2+, Ph2I+, tropanium, N,N,N′,N′-Me4-1,2-ethanediammonium, N,N,N′,N′-Me4-1,3-propanediammonium, N-Me-piperazinium(2+), and N,N′-Me2-piperazinium(2+) cations, and
Robertson,Cameron,Knop
, p. 1572 - 1591 (1996)
Crystal-structure determinations are reported for Me2NH2I3, (Ph2I)I3, tropanium·I3, [Me2HN(CH2)2NHMe2](I3)2, [Me2HN(CH2)3NHMe2](I3)2, (N-Me-piperazinium) (I3)2·H2O, (N,N′-Me2-piperazinium)(I3)2, and Me2NH2I. The features of these and relevant literature structures are used to (1) classify triiodide structures by their ion-packing types; (2) analyze the relationship between the two I-I bond lengths d and d* in the I3- anion; and (3) examine the effect of N-H(N)...I hydrogen bonding on the symmetry of the I3- anion. It is found that the d,d* relationship can be represented to a high degree of correlation by the power function d*-d0 = K(d-d0)-c (d*≥d, d0 = d(I-I) in I2(g)) based on the 3c4e model of the anion. An empirical correlation is shown to exist between the H(N)..I and N...I distances both for unbranched and branched N-H(N)...I bonds. Comparison of the degree of asymmetry of I3- in two samples, one containing H-bonded I3- anions, the other with H-bonding absent, leads to the conclusion that while H-bonding is a factor affecting I3- symmetry, it is not a preferential factor. The four 1:2 title triiodides have structures of, or related to, the CdI2 type, in which the anions form infinite pseudo-hexagonal channels. The positioning of the divalent cations on the axes of these channels gives rise to an interesting `vernier' effect governed by the cation length and H-bonding ability. Bonding in centrosymmetric I4 rings in (Ph2I)I3 and (Ph2I)I is examined.
Crystal and molecular structure of diphenyliodonium triiodide
Chernov'yants,Burykin,Starikova,Rostovskaya
, p. 193 - 196 (2012)
A new salt diphenyliodonium triiodide (C12H10I 4) was obtained. The [C12H10I +][I3-] compound was isolated as red brown crystals and studied by single-crystal X-ray diffraction. The structure of diphenyliodonium triiodide consists of separate, virtually linear I 3- anions and C12H10I+ cations. Strong intermolecular anion-anion (I3 -?I3-) and anion-cation (I 3- ?I+) interactions in the crystal structure leads to a change in the symmetry of triiodide ions. The complex formation in the system organic cation iodide-elementary iodine was studied by spectrophotometry. The complex composition was found (1:1), and the stability constant of the complex in chloroform was determined (logβ = 3.91). Pleiades Publishing, Ltd., 2012.
