Open AccessSolvent‐free synthesis and crystal structure of (Ph 3 PI)I 5 , the third member in the series Ph 3 P(I 2 ) n ( n = 1, 2 and 3)
Author(s) -
Pritchard Robin G.,
Moreland Lee
Publication year - 2006
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
eISSN - 1600-5759
pISSN - 0108-2701
DOI - 10.1107/s0108270106039825
Subject(s) - series (stratigraphy) , pi , chemistry , crystallography , crystal structure , solvent , inorganic chemistry , organic chemistry , geology , paleontology , biochemistry
Red crystals of iodotriphenylphosphonium pentaiodide, C 18 H 15 IP + ·I 5 − , appear on cooling the black melt formed by heating a mixture of the commonplace reagents triphenylphosphine and molecular iodine. The compound has the highest I:P ratio hitherto established for a crystalline iodophosphonium polyiodide and constitutes the third member of the series Ph 3 P(I 2 ) n ( n = 1, 2 and 3). All atoms occupy general positions in the triclinic space group P . Comparison of the bond lengths within the above series reveals a pattern of primary and secondary bonding that is highly reminiscent of the much studied polyiodides, I − 2 n +1 , where one of the I 2 moieties has been replaced by a P—I group.