Synthesis and crystal structures of [Ph3PCH2PPh3]I2 dichloromethane disolvate and [Ph3PCH2PPh3](BI4)2
Date of Issue2017
School of Physical and Mathematical Sciences
Reaction of BI3 with carbodiphosphorane, C(PPh3)2, gives a mixture of the dicationic compounds, methylenebis(triphenylphosphonium) diiodide dichloromethane disolvate, C37H32P22+·2I−·2CH2Cl2 or [Ph3PCH2PPh3]I2·2CH2Cl2 (I), methylenebis(triphenylphosphonium) bis(tetraiodoborate), C37H32P22+·2BI4− or [Ph3PCH2PPh3](BI4)2 (II). Solvents are the source of the protons at the ylidic C atom. The P—C—P angle is 124.1 (2)° for (I) and 121.7 (3)° for (II), while the two P—C bond lengths are 1.804 (4) and 1.807 (5) Å in (I), and 1.817 (5) and 1.829 (5) Å in (II). In the crystal of (I), the protons of the central P—CH2—P C atom exhibit weak C—H...I hydrogen bonds with the respective anions. The anions in turn are linked to the dichloromethane solvent molecules by C—H...I hydrogen bonds. In the crystal of (II), one of the BI4− anions is linked to a phenyl H atom via a weak C—H...I hydrogen bond.
Acta Crystallographica Section E: Crystallographic Communications
© 2017 The Author(s) (published by International Union of Crystallography). This paper was published in Acta Crystallographica Section E: Crystallographic Communications and is made available as an electronic reprint (preprint) with permission of International Union of Crystallography. The published version is available at: [http://dx.doi.org/10.1107/S2056989017010295]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.