organic compounds
Solvate-free bis(triphenylphosphine)iminium chloride
aInstitut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg i. Br., Germany
*Correspondence e-mail: carsten.knapp@ac.uni-freiburg.de
The title compound, C36H30NP2+·Cl−, crystallized in the solvate-free form from a CH3CN/OEt2 solution. The chloride anion and the N atom of the [(Ph3P)2N]+ cation are located on a twofold axis, yielding overall symmetry 2 for the cation. The central P—N—P angle [133.0 (3)°] is at the low end of the range of observed P—N—P angles.
Related literature
Several bis(triphenylphosphine)iminium chloride structures containing solvate molecules have been determined. For [(Ph3P)2N]Cl·B(OH)3, see: Andrews et al. (1983); for [(Ph3P)2N]Cl·CH3C6H5, see: Weller et al. (1993); for [(Ph3P)2N]Cl·CH2Cl2, see: Carroll et al. (1996); for [(Ph3P)2N]Cl·CH2Cl2·H2O, see: de Arellano (1997). Other bis(triphenylphosphine)iminium halide structures have been determined: for [(Ph3P)2N]Br·CH3CN, see: Knapp & Uzun (2010); for [(Ph3P)2N]I, see: Beckett et al. (2010). For a discussion of the [(Ph3P)2N]+ cation, see: Lewis & Dance (2000). For a description of the Cambridge Structural Database, see: Allen (2002). For the synthesis, see: Ruff & Schlientz (1974).
Experimental
Crystal data
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Refinement
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Data collection: CrystalClear (Rigaku, 2007); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2010); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536810046325/fi2099sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810046325/fi2099Isup2.hkl
[(Ph3P)2N]Cl has been synthesized according to a published method (Ruff et al., 1974). Single crystals suitable for X-ray diffraction were obtained by layering a CH3CN solution with diethyl ether.
The hydrogen atoms were positioned geometrically and refined using a riding model. The same Uiso value was used for all H atoms, which refined to 0.031 (3) Å2.
The title compound [(Ph3P)2N]Cl ([PNP]Cl) is a very important starting material and numerous crystal structures containing the [(Ph3P)2N]+ cation are known. The Cambridge Structural Database (Allen, 2002) currently contains more than 1200 structures containing the [(Ph3P)2N]+ cation. Usually this cation is partnered by a bulky cation, while crystal structures containing small anions and especially halides are rare. Very recently, the crystal structures of solvate-free [(Ph3P)2N]I (Beckett et al., 2010) and [(Ph3P)2N]Br.CH3CN (Knapp et al., 2010) were published.
Several crystal structures of [(Ph3P)2N]Cl containing solvate molecules have been determined, e.g. [(Ph3P)2N]Cl.B(OH)3 (Andrews et al. (1983)), [(Ph3P)2N]Cl.CH3C6H5, (Weller et al. (1993)), [(Ph3P)2N]Cl.CH2Cl2 (Carroll et al. (1996)), [(Ph3P)2N]Cl.CH2Cl2.H2O (de Arellano (1997)). Surprisingly, the
of the parent compound [(Ph3P)2N]Cl was still unknown.[(Ph3P)2N]Cl has been synthesized according to a published method (Ruff et al., 1974) and solvate-free single crystals suitable for X-ray diffraction were obtained by layering a CH3CN solution with diethyl ether. The chlorine anion and the [(Ph3P)2N]+ cation are located on a 2 axis, yielding overall symmetry 2 of the cation. The central P—N—P angle [133.1 (3)°] is on the low end of the range of observed P—N—P angles. The P-N (1.597 (2) Å) and P-C distances (179.3 (4)–180.8 (4) Å) are in the expected range.
Several bis(triphenylphosphine)iminium chloride structures containing solvate molecules have been determined. For [(Ph3P)2N]Cl.B(OH)3, see: Andrews et al. (1983); for [(Ph3P)2N]Cl.CH3C6H5, see: Weller et al. (1993); for [(Ph3P)2N]Cl.CH2Cl2, see: Carroll et al. (1996); for [(Ph3P)2N]Cl.CH2Cl2.H2O, see: de Arellano (1997). Other bis(triphenylphosphine)iminium halide structures have been determined: for [(Ph3P)2N]Br.CH3CN, see: Knapp et al. (2010); for [(Ph3P)2N]I, see: Beckett et al. (2010). For a discussion of the [(Ph3P)2N]+ cation, see: Lewis et al. (2000). For a description of the Cambridge Structural Database, see: Allen (2002). For the synthesis, see: Ruff & Schlientz (1974).
Data collection: CrystalClear (Rigaku, 2007); cell
CrystalClear (Rigaku, 2007); data reduction: CrystalClear (Rigaku, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2010); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C36H30NP2+·Cl− | F(000) = 1200 |
Mr = 574.00 | Dx = 1.309 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 1435 reflections |
a = 15.094 (3) Å | θ = 2.2–27.5° |
b = 10.499 (2) Å | µ = 0.27 mm−1 |
c = 18.615 (4) Å | T = 123 K |
β = 99.06 (3)° | Block, colourless |
V = 2913.0 (10) Å3 | 0.30 × 0.23 × 0.23 mm |
Z = 4 |
Rigaku R-AXIS Spider diffractometer | 2551 independent reflections |
Radiation source: sealed tube | 2296 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.043 |
Detector resolution: 10.0000 pixels mm-1 | θmax = 25.0°, θmin = 2.2° |
ω scans and/or φ scans | h = −17→17 |
Absorption correction: multi-scan (ABSCOR; Higashi, 2001) | k = −12→11 |
Tmin = 0.924, Tmax = 0.941 | l = −20→22 |
7362 measured reflections |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.049 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.135 | H-atom parameters constrained |
S = 1.24 | w = 1/[σ2(Fo2) + 10.5312P] where P = (Fo2 + 2Fc2)/3 |
2551 reflections | (Δ/σ)max < 0.001 |
183 parameters | Δρmax = 0.41 e Å−3 |
0 restraints | Δρmin = −0.42 e Å−3 |
C36H30NP2+·Cl− | V = 2913.0 (10) Å3 |
Mr = 574.00 | Z = 4 |
Monoclinic, C2/c | Mo Kα radiation |
a = 15.094 (3) Å | µ = 0.27 mm−1 |
b = 10.499 (2) Å | T = 123 K |
c = 18.615 (4) Å | 0.30 × 0.23 × 0.23 mm |
β = 99.06 (3)° |
Rigaku R-AXIS Spider diffractometer | 2551 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 2001) | 2296 reflections with I > 2σ(I) |
Tmin = 0.924, Tmax = 0.941 | Rint = 0.043 |
7362 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 0 restraints |
wR(F2) = 0.135 | H-atom parameters constrained |
S = 1.24 | w = 1/[σ2(Fo2) + 10.5312P] where P = (Fo2 + 2Fc2)/3 |
2551 reflections | Δρmax = 0.41 e Å−3 |
183 parameters | Δρmin = −0.42 e Å−3 |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
Cl1 | 0.5000 | 0.80128 (11) | 0.7500 | 0.0264 (3) | |
P1 | 0.53916 (5) | 0.32003 (8) | 0.82724 (4) | 0.0175 (2) | |
N1 | 0.5000 | 0.2594 (4) | 0.7500 | 0.0200 (8) | |
C1 | 0.45695 (19) | 0.4133 (3) | 0.86442 (16) | 0.0177 (6) | |
C2 | 0.4358 (2) | 0.5349 (3) | 0.83690 (17) | 0.0206 (7) | |
H2 | 0.4700 | 0.5724 | 0.8038 | 0.030 (3)* | |
C3 | 0.3645 (2) | 0.6011 (3) | 0.85815 (19) | 0.0262 (8) | |
H3 | 0.3505 | 0.6844 | 0.8399 | 0.030 (3)* | |
C4 | 0.3135 (2) | 0.5461 (4) | 0.90596 (19) | 0.0293 (8) | |
H4 | 0.2639 | 0.5908 | 0.9193 | 0.030 (3)* | |
C5 | 0.3353 (2) | 0.4258 (3) | 0.9342 (2) | 0.0288 (8) | |
H5 | 0.3009 | 0.3891 | 0.9675 | 0.030 (3)* | |
C6 | 0.4070 (2) | 0.3582 (3) | 0.91427 (18) | 0.0258 (7) | |
H6 | 0.4220 | 0.2761 | 0.9340 | 0.030 (3)* | |
C7 | 0.57029 (19) | 0.1897 (3) | 0.88839 (17) | 0.0182 (7) | |
C8 | 0.6079 (2) | 0.2160 (3) | 0.96055 (18) | 0.0247 (7) | |
H8 | 0.6183 | 0.3018 | 0.9758 | 0.030 (3)* | |
C9 | 0.6297 (2) | 0.1184 (3) | 1.00954 (18) | 0.0260 (7) | |
H9 | 0.6548 | 0.1365 | 1.0585 | 0.030 (3)* | |
C10 | 0.6148 (2) | −0.0064 (3) | 0.98669 (19) | 0.0261 (8) | |
H10 | 0.6298 | −0.0738 | 1.0204 | 0.030 (3)* | |
C11 | 0.5784 (2) | −0.0344 (3) | 0.91551 (19) | 0.0242 (7) | |
H11 | 0.5685 | −0.1204 | 0.9005 | 0.030 (3)* | |
C12 | 0.5563 (2) | 0.0643 (3) | 0.86618 (18) | 0.0224 (7) | |
H12 | 0.5316 | 0.0457 | 0.8171 | 0.030 (3)* | |
C13 | 0.6391 (2) | 0.4148 (3) | 0.82560 (17) | 0.0216 (7) | |
C14 | 0.6520 (2) | 0.5357 (3) | 0.85535 (18) | 0.0232 (7) | |
H14 | 0.6081 | 0.5726 | 0.8804 | 0.030 (3)* | |
C15 | 0.7303 (2) | 0.6030 (3) | 0.8482 (2) | 0.0299 (8) | |
H15 | 0.7385 | 0.6868 | 0.8674 | 0.030 (3)* | |
C16 | 0.7957 (2) | 0.5487 (4) | 0.8137 (2) | 0.0314 (9) | |
H16 | 0.8488 | 0.5950 | 0.8098 | 0.030 (3)* | |
C17 | 0.7839 (2) | 0.4266 (3) | 0.78468 (19) | 0.0275 (8) | |
H17 | 0.8292 | 0.3888 | 0.7616 | 0.030 (3)* | |
C18 | 0.7054 (2) | 0.3602 (3) | 0.78966 (18) | 0.0249 (7) | |
H18 | 0.6964 | 0.2777 | 0.7688 | 0.030 (3)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0250 (6) | 0.0205 (6) | 0.0352 (7) | 0.000 | 0.0095 (5) | 0.000 |
P1 | 0.0157 (4) | 0.0178 (4) | 0.0194 (4) | 0.0007 (3) | 0.0037 (3) | 0.0004 (3) |
N1 | 0.0140 (17) | 0.026 (2) | 0.0199 (19) | 0.000 | 0.0030 (14) | 0.000 |
C1 | 0.0184 (15) | 0.0189 (16) | 0.0147 (14) | 0.0012 (12) | −0.0006 (12) | −0.0041 (13) |
C2 | 0.0217 (16) | 0.0205 (17) | 0.0194 (16) | −0.0022 (13) | 0.0028 (13) | −0.0014 (14) |
C3 | 0.0228 (16) | 0.0240 (18) | 0.0309 (18) | 0.0045 (14) | 0.0014 (14) | −0.0018 (15) |
C4 | 0.0186 (16) | 0.036 (2) | 0.033 (2) | 0.0056 (14) | 0.0048 (14) | −0.0104 (17) |
C5 | 0.0274 (18) | 0.0265 (18) | 0.036 (2) | −0.0023 (15) | 0.0161 (15) | −0.0018 (17) |
C6 | 0.0232 (17) | 0.0279 (18) | 0.0270 (18) | 0.0008 (14) | 0.0057 (14) | 0.0038 (15) |
C7 | 0.0161 (15) | 0.0199 (16) | 0.0192 (16) | 0.0005 (12) | 0.0044 (12) | 0.0004 (13) |
C8 | 0.0263 (17) | 0.0210 (17) | 0.0272 (18) | −0.0010 (14) | 0.0055 (14) | 0.0006 (15) |
C9 | 0.0280 (18) | 0.0304 (19) | 0.0188 (16) | 0.0008 (14) | 0.0012 (13) | 0.0025 (15) |
C10 | 0.0230 (17) | 0.0273 (18) | 0.0287 (19) | 0.0028 (14) | 0.0062 (14) | 0.0135 (15) |
C11 | 0.0252 (17) | 0.0151 (16) | 0.0330 (19) | 0.0000 (13) | 0.0072 (14) | 0.0033 (14) |
C12 | 0.0177 (15) | 0.0261 (18) | 0.0236 (17) | −0.0016 (13) | 0.0036 (13) | −0.0018 (15) |
C13 | 0.0163 (15) | 0.0246 (17) | 0.0238 (17) | 0.0001 (13) | 0.0026 (12) | 0.0033 (14) |
C14 | 0.0235 (17) | 0.0186 (16) | 0.0276 (18) | −0.0014 (13) | 0.0040 (13) | −0.0024 (14) |
C15 | 0.0240 (17) | 0.0280 (19) | 0.036 (2) | −0.0052 (15) | −0.0003 (15) | −0.0018 (16) |
C16 | 0.0163 (16) | 0.043 (2) | 0.033 (2) | −0.0046 (15) | −0.0021 (14) | 0.0123 (17) |
C17 | 0.0205 (16) | 0.032 (2) | 0.0305 (19) | 0.0033 (14) | 0.0050 (14) | 0.0089 (16) |
C18 | 0.0195 (16) | 0.0311 (19) | 0.0237 (17) | 0.0026 (14) | 0.0020 (13) | −0.0027 (15) |
P1—N1 | 1.5984 (18) | C8—H8 | 0.9500 |
P1—C7 | 1.795 (3) | C9—C10 | 1.385 (5) |
P1—C1 | 1.802 (3) | C9—H9 | 0.9500 |
P1—C13 | 1.811 (3) | C10—C11 | 1.384 (5) |
N1—P1i | 1.5984 (18) | C10—H10 | 0.9500 |
C1—C2 | 1.394 (4) | C11—C12 | 1.390 (5) |
C1—C6 | 1.409 (5) | C11—H11 | 0.9500 |
C2—C3 | 1.390 (5) | C12—H12 | 0.9500 |
C2—H2 | 0.9500 | C13—C14 | 1.386 (5) |
C3—C4 | 1.390 (5) | C13—C18 | 1.410 (4) |
C3—H3 | 0.9500 | C14—C15 | 1.401 (5) |
C4—C5 | 1.387 (5) | C14—H14 | 0.9500 |
C4—H4 | 0.9500 | C15—C16 | 1.383 (5) |
C5—C6 | 1.392 (5) | C15—H15 | 0.9500 |
C5—H5 | 0.9500 | C16—C17 | 1.392 (5) |
C6—H6 | 0.9500 | C16—H16 | 0.9500 |
C7—C12 | 1.386 (4) | C17—C18 | 1.391 (5) |
C7—C8 | 1.401 (4) | C17—H17 | 0.9500 |
C8—C9 | 1.377 (5) | C18—H18 | 0.9500 |
N1—P1—C7 | 106.82 (17) | C8—C9—C10 | 119.3 (3) |
N1—P1—C1 | 112.50 (12) | C8—C9—H9 | 120.3 |
C7—P1—C1 | 107.33 (15) | C10—C9—H9 | 120.3 |
N1—P1—C13 | 113.24 (13) | C11—C10—C9 | 121.1 (3) |
C7—P1—C13 | 107.11 (14) | C11—C10—H10 | 119.5 |
C1—P1—C13 | 109.49 (15) | C9—C10—H10 | 119.5 |
P1—N1—P1i | 133.0 (3) | C10—C11—C12 | 119.5 (3) |
C2—C1—C6 | 120.2 (3) | C10—C11—H11 | 120.3 |
C2—C1—P1 | 119.2 (2) | C12—C11—H11 | 120.3 |
C6—C1—P1 | 120.2 (2) | C7—C12—C11 | 120.1 (3) |
C3—C2—C1 | 119.7 (3) | C7—C12—H12 | 119.9 |
C3—C2—H2 | 120.1 | C11—C12—H12 | 119.9 |
C1—C2—H2 | 120.1 | C14—C13—C18 | 119.7 (3) |
C4—C3—C2 | 120.4 (3) | C14—C13—P1 | 124.1 (2) |
C4—C3—H3 | 119.8 | C18—C13—P1 | 116.1 (3) |
C2—C3—H3 | 119.8 | C13—C14—C15 | 119.5 (3) |
C5—C4—C3 | 119.9 (3) | C13—C14—H14 | 120.3 |
C5—C4—H4 | 120.0 | C15—C14—H14 | 120.3 |
C3—C4—H4 | 120.0 | C16—C15—C14 | 120.7 (3) |
C4—C5—C6 | 120.7 (3) | C16—C15—H15 | 119.6 |
C4—C5—H5 | 119.6 | C14—C15—H15 | 119.6 |
C6—C5—H5 | 119.6 | C15—C16—C17 | 120.2 (3) |
C5—C6—C1 | 119.0 (3) | C15—C16—H16 | 119.9 |
C5—C6—H6 | 120.5 | C17—C16—H16 | 119.9 |
C1—C6—H6 | 120.5 | C18—C17—C16 | 119.6 (3) |
C12—C7—C8 | 119.5 (3) | C18—C17—H17 | 120.2 |
C12—C7—P1 | 121.5 (2) | C16—C17—H17 | 120.2 |
C8—C7—P1 | 118.9 (2) | C17—C18—C13 | 120.3 (3) |
C9—C8—C7 | 120.5 (3) | C17—C18—H18 | 119.9 |
C9—C8—H8 | 119.8 | C13—C18—H18 | 119.9 |
C7—C8—H8 | 119.8 | ||
C7—P1—N1—P1i | −179.94 (11) | C12—C7—C8—C9 | −0.9 (5) |
C1—P1—N1—P1i | 62.54 (12) | P1—C7—C8—C9 | 177.8 (2) |
C13—P1—N1—P1i | −62.27 (13) | C7—C8—C9—C10 | 0.4 (5) |
N1—P1—C1—C2 | −76.9 (3) | C8—C9—C10—C11 | 0.1 (5) |
C7—P1—C1—C2 | 165.9 (2) | C9—C10—C11—C12 | −0.1 (5) |
C13—P1—C1—C2 | 50.0 (3) | C8—C7—C12—C11 | 0.9 (5) |
N1—P1—C1—C6 | 95.5 (3) | P1—C7—C12—C11 | −177.8 (2) |
C7—P1—C1—C6 | −21.7 (3) | C10—C11—C12—C7 | −0.4 (5) |
C13—P1—C1—C6 | −137.7 (3) | N1—P1—C13—C14 | 132.3 (3) |
C6—C1—C2—C3 | −0.8 (5) | C7—P1—C13—C14 | −110.2 (3) |
P1—C1—C2—C3 | 171.6 (2) | C1—P1—C13—C14 | 5.9 (3) |
C1—C2—C3—C4 | −0.8 (5) | N1—P1—C13—C18 | −46.0 (3) |
C2—C3—C4—C5 | 1.7 (5) | C7—P1—C13—C18 | 71.5 (3) |
C3—C4—C5—C6 | −1.0 (5) | C1—P1—C13—C18 | −172.5 (2) |
C4—C5—C6—C1 | −0.5 (5) | C18—C13—C14—C15 | 1.1 (5) |
C2—C1—C6—C5 | 1.4 (5) | P1—C13—C14—C15 | −177.2 (3) |
P1—C1—C6—C5 | −170.9 (3) | C13—C14—C15—C16 | −1.8 (5) |
N1—P1—C7—C12 | −2.0 (3) | C14—C15—C16—C17 | 0.8 (5) |
C1—P1—C7—C12 | 118.9 (3) | C15—C16—C17—C18 | 1.0 (5) |
C13—P1—C7—C12 | −123.6 (3) | C16—C17—C18—C13 | −1.7 (5) |
N1—P1—C7—C8 | 179.3 (2) | C14—C13—C18—C17 | 0.7 (5) |
C1—P1—C7—C8 | −59.8 (3) | P1—C13—C18—C17 | 179.1 (3) |
C13—P1—C7—C8 | 57.7 (3) |
Symmetry code: (i) −x+1, y, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | C36H30NP2+·Cl− |
Mr | 574.00 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 123 |
a, b, c (Å) | 15.094 (3), 10.499 (2), 18.615 (4) |
β (°) | 99.06 (3) |
V (Å3) | 2913.0 (10) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.27 |
Crystal size (mm) | 0.30 × 0.23 × 0.23 |
Data collection | |
Diffractometer | Rigaku R-AXIS Spider |
Absorption correction | Multi-scan (ABSCOR; Higashi, 2001) |
Tmin, Tmax | 0.924, 0.941 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7362, 2551, 2296 |
Rint | 0.043 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.049, 0.135, 1.24 |
No. of reflections | 2551 |
No. of parameters | 183 |
H-atom treatment | H-atom parameters constrained |
w = 1/[σ2(Fo2) + 10.5312P] where P = (Fo2 + 2Fc2)/3 | |
Δρmax, Δρmin (e Å−3) | 0.41, −0.42 |
Computer programs: CrystalClear (Rigaku, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg & Putz, 2010).
P1—N1 | 1.5984 (18) | P1—C1 | 1.802 (3) |
P1—C7 | 1.795 (3) | P1—C13 | 1.811 (3) |
P1—N1—P1i | 133.0 (3) |
Symmetry code: (i) −x+1, y, −z+3/2. |
Acknowledgements
Financial support by the Deutsche Forschungsgemeinschaft (DFG) and the Universität Freiburg is gratefully acknowledged.
References
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The title compound [(Ph3P)2N]Cl ([PNP]Cl) is a very important starting material and numerous crystal structures containing the [(Ph3P)2N]+ cation are known. The Cambridge Structural Database (Allen, 2002) currently contains more than 1200 structures containing the [(Ph3P)2N]+ cation. Usually this cation is partnered by a bulky cation, while crystal structures containing small anions and especially halides are rare. Very recently, the crystal structures of solvate-free [(Ph3P)2N]I (Beckett et al., 2010) and [(Ph3P)2N]Br.CH3CN (Knapp et al., 2010) were published.
Several crystal structures of [(Ph3P)2N]Cl containing solvate molecules have been determined, e.g. [(Ph3P)2N]Cl.B(OH)3 (Andrews et al. (1983)), [(Ph3P)2N]Cl.CH3C6H5, (Weller et al. (1993)), [(Ph3P)2N]Cl.CH2Cl2 (Carroll et al. (1996)), [(Ph3P)2N]Cl.CH2Cl2.H2O (de Arellano (1997)). Surprisingly, the crystal structure of the parent compound [(Ph3P)2N]Cl was still unknown.
[(Ph3P)2N]Cl has been synthesized according to a published method (Ruff et al., 1974) and solvate-free single crystals suitable for X-ray diffraction were obtained by layering a CH3CN solution with diethyl ether. The chlorine anion and the [(Ph3P)2N]+ cation are located on a 2 axis, yielding overall symmetry 2 of the cation. The central P—N—P angle [133.1 (3)°] is on the low end of the range of observed P—N—P angles. The P-N (1.597 (2) Å) and P-C distances (179.3 (4)–180.8 (4) Å) are in the expected range.