Bis(dicyclohexylphenylphosphine)silver(I) nitrate

The title compound, [Ag(C18H27P)2]NO3, is a mononuclear salt species in which the Ag atom is coordinated by two phosphine ligands, forming a cation, with the nitrate as the counter-anion, weakly interacting with the Ag atom, resulting in Ag⋯O distances of 2.602 (6) and 2.679 (6) Å. The cationic silver–phosphine complex has a non-linear geometry in which the P—Ag—P angle is 154.662 (19)°. The Ag—P bond lengths are 2.4303 (6) and 2.4046 (5) Å.

The title compound, [Ag(C 18 H 27 P) 2 ]NO 3 , is a mononuclear salt species in which the Ag atom is coordinated by two phosphine ligands, forming a cation, with the nitrate as the counter-anion, weakly interacting with the Ag atom, resulting in AgÁ Á ÁO distances of 2.602 (6) and 2.679 (6) Å . The cationic silver-phosphine complex has a non-linear geometry in which the P-Ag-P angle is 154.662 (19) . The Ag-P bond lengths are 2.4303 (6) and 2.4046 (5) Å .

Experimental
Crystal data [Ag(C 18  ARB thanks the Research Academy for Undergraduates, University of Johannesburg, for financial support. Financial assistance from the South African National Research Foundation and University of Johannesburg is gratefully acknowledged. Opinions, findings, conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NRF. phosphine ligand often leads to the formation of two-or three-coordinate complexes. The difference between two-and three-coordinate complexes is hinged on the correlation between increasing Ag-P bond distance and decreasing P-Ag-P angle which is determined by the donor properties of the anion (Bowmaker et al., 1996).
The longer the interaction between the anion atom/s and the Ag atom, the more linear (closer to 180°) the P-Ag-P angle will be, although the presence of bulky phosphine ligands (such as tricyclohexylphosphine or phenyldicyclohexylphosphine) would also influence the P-Ag-P angle.
The title compound (I) crystallizes in the monoclinic noncentrosymmetric space group P2 1 and the asymmetric unit contains one Ag(I) cation and one nitrate anionic ligand. The crystal structure of the title compound [Ag{PPh(C 6 H 11 ) 2 ].NO 3 ( Fig. 1) shows that the complex contains well resolved [Ag{PPh(C 6 H 11 ) 2 } 2 ] + cation and NO 3 anion. Examination of the structure with PLATON (Spek, 2009) showed that there were no solvent accessible voids in the crystal lattice.
As shown in Fig. 1, the cation shows a nonlinear coordination sphere in which the P-Ag-P angle is 154.662 (

Refinement
All hydrogen atoms were positioned geometrically, with C-H = 0.98 Å for methine Hydrogens, 0.97 Å for methylene hydrogen and 0.93 Å for aromatic hydrogens, and allowed to ride on their parent atoms with U iso (H) = 1.2U eq (C).

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.