Bis[2-(diphenylphosphanyl-κP)benzaldehyde]iodidogold(I)

In the title compound, [AuI(C19H15OP)2], the complete molecule is generated by the application of twofold symmetry. The AuI atom is in a trigonal–planar geometry within an IP2 donor set with the greatest distortion seen in the P—Au—P angle [128.49 (3) °]. Close intramolecular Au⋯O interactions [3.172 (3) Å] are observed. No specific intermolecular interactions are noted in the crystal packing.

In the title compound, [AuI(C 19 H 15 OP) 2 ], the complete molecule is generated by the application of twofold symmetry. The Au I atom is in a trigonal-planar geometry within an IP 2 donor set with the greatest distortion seen in the P-Au-P angle [128.49 (3) ]. Close intramolecular AuÁ Á ÁO interactions
We thank Griffith University for support of this work. We also thank the Ministry of Higher Education (Malaysia) for funding structural studies through the High-Impact Research scheme (UM.C/HIR/MOHE/SC/12).
In (I), Fig. 1, the complete molecule is generated by the application of twofold symmetry. The Au atom is in a trigonal planar geometry within a IP 2 donor set, Table 1, with the greatest distortion manifested in the angle, i.e. 128.49 (3)°, subtended by the phosphine ligands, Table 1. The Au-I and Au-P bond lengths in the comparable (Ph 3 P) 2 AuI complex, which also has crystallographic twofold symmetry are 2.754 (1) and 2.333 (2) Å, respectively (Bowmaker et al., 1987); the P-Au-P angle is 132.13 (7)°.
No specific intermolecular interactions are noted in the crystal packing. Globally, molecules are arranged in layers that stack along the c axis.

Refinement
The H atoms were geometrically placed (C-H = 0.94-0.99 Å) and refined as riding with U iso (H) = 1.2U eq (C). The maximum and minimum residual electron density peaks of 1.47 and 1.34 e Å -3 , respectively, were located 0.82 Å and 0.86 Å from the Au atom.  Molecular structure of (I) showing atom-labelling scheme and displacement ellipsoids at the 50% probability level. The molecule has twofold symmetry and unlabelled atoms are related by the symmetry operation 2 -x, y, 1/2 -z.

Figure 2
A view in projection down the a axis of the unit-cell contents of (I). where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max = 0.001 Δρ max = 1.47 e Å −3 Δρ min = −1.34 e Å −3 Special details Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq