(1-Acetyl-thio-urea-κS)bromido-bis(triphenyl-phosphane-κP)silver(I)

Controlling Molecular Organization by Using Phenyl Embraces of Multiple Trityl Groups

Sixfold phenyl embraces are well-established aromatic interactions that are strong and directional. In addition, functional groups that are able to participate, such as triphenylmethyl (trityl), are easily incorporated in molecular structures. As a result, embraces offer a possible way to control molecular organization in materials. To test this notion, we used a hybrid organic-inorganic strategy to make compounds with multiple trityl groups. Trityl-substituted alkynylpyridines 3-5 react with Pd(II) to form square-planar 4:1 complexes with multiple divergent trityl groups poised to engage in embraces. The complexes were crystallized, and their structures were determined by X-ray diffraction. Surprisingly, few structures in this set of compounds were found to incorporate sixfold embraces. Our observations suggest that predictable molecular organization cannot normally be achieved using these embraces, which must compete with alternative aromatic interactions of similar energy.

Crystal structure of (1,3-di-methyl-thio-urea-κS)tris-(tri-phenyl-phosphane-κP)silver(I) acetate

In the mononuclear title salt, [Ag(C₃H₈N₂S)(C₁₈H₁₅P)₃](CH₃COO), the Ag^I ion exhibits a distorted tetra­hedral coordination sphere defined by three P atoms from three tri­phenyl­phosphane ligands and one S atom from a 1,3-di­­methyl­thio­urea ligand. In the crystal, the acetate anion is linked with the complex cation via duplex N—H⋯O hydrogen bonds [graph-set motif R²₂(8)].

(N,N'-Di-ethyl-thio-urea-κS)tris-(triphenylphosphane-κP)silver(I) acetate methanol monosolvate

In the mononuclear title complex, [Ag(C5H12N2S)(C18H15P)3](CH3COO)·CH3OH, the Ag(I) ion is in a distorted tetra-hedral coordination geometry formed by three P atoms from three tri-phenyl-phosphane ligands and one S atom from an N,N'-di-ethyl-thio-urea ligand. In the crystal, the acetate anion is connected to the complex mol-ecule via a pair of N-H⋯O hydrogen bonds [graph-set motif R (2) 2(8)] and the solvent methanol mol-ecule is connected to the anion via an O-H⋯O hydrogen bond. This aggregate is further connected through a weak C-H⋯O hydrogen bond, forming a chain along [100]. In addition, sixfold phenyl embraces with inter-molecular distances of 6.6463 (13)-6.667 (2) Å are arranged in a chain along [001]. The combination of hydrogen bonding and phen-yl⋯phenyl inter-actions leads to the formation of a two-dimensional network parallel to (010).

[1H-1,2,4-Triazole-5(4H)-thione-κS]bis-(tri-phenyl-phosphane-κP)(nitrato-κO)silver(I) methanol monosolvate

In the title complex, [Ag(NO₃)(C₂H₃N₃S)(C₁₈H₁₅P)₂]·CH₃OH, the Ag^I ion exhibits a distorted tetra­hedral coordination geometry formed by two P atoms from two tri­phenyl­phosphine ligands, one S atom from a 1H-1,2,4-triazole-5(4H)-thione ligand and one O atom from a nitrate ion. In the crystal, complex and solvent mol­ecules are linked by O—H⋯O and N—H⋯O hydrogen bonds forming a chain along the b-axis direction. The chains are linked by weak C—H⋯O hydrogen bonds forming a two-dimensional supra­molecular architecture parallel to (001). In addition, an intra­molecular N—H⋯O hydrogen bond is observed.

Di-aqua-{μ2-N,N'-bis-[(cyclo-hexa-nyl-idene)amino]-oxamide}-bis-(tri-phenyl-phosphane)silver(I) dinitrate

The dinuclear title compound, [Ag₂(C₁₄H₂₂N₄O₂)(C₁₈H₁₅P)₂(H₂O)₂](NO₃)₂, lies across an inversion center and consists of two [Ag(H₂O)(PPh₃)] units bridged by a bis­(cyclo­hexa­none)oxalydihydrazone ligand. The charge-balance is supplied by two nitrate anions. The symmetry-unique Ag^I ion is in a distorted tetra­hedral geometry coordinated by a P atom from a tri­phenyl­phosphane ligand, an O atom from a water mol­ecule and a bis­(cyclo­hexa­none)oxalydihydrazone ligand bidentate chelating through the O atom and one of N atoms. In the crystal, O—H⋯O and N—H⋯O hydrogen bonds link the components, forming chains along the b-axis direction. These chains are connected through weak C—H⋯O hydrogen bonds, leading to the formation of a two-dimensional supra­molecular network parallel to (001).

Di-μ-thio-semicarbazide-κ(4)S:S-bis-[chlori-dobis(triphenyl-phosphane-κP)silver(I)]

The dinuclear title complex, [Ag₂Cl₂(CH₅N₃S)₂(C₁₈H₁₅P)₂], lies across an inversion center. The Ag^I ion exhibits a slightly distorted tetra­hedral coordination geometry formed by a P atom from a triphenyl­phosphane ligand, two metal-bridging S atoms from thio­semicabazide ligands and one chloride ion. The S atoms bridge two symmetry-related Ag^I ions, forming a strictly planar Ag₂S₂ core with an Ag⋯Ag separation of 2.7802 (7) Å. There is an intra­molecular N—H⋯Cl hydrogen bond. In the crystal, N—H⋯Cl and N—H⋯S hydrogen bonds link complex mol­ecules, forming layers parallel to (001). These layers are connected through π–π stacking inter­actions [centroid–centroid distance = 3.665 (2) Å], leading to the formation of a three-dimensional network.