μ-Oxalato-bis­[bis­(triphenyl­phosphine)copper(I)] dichloro­methane disolvate

The dinuclear molecule of the title compound, [Cu₂(C₂O₄)(C₁₈H₁₅P)₄]·2CH₂Cl₂, lies across an inversion center with a strictly planar bridging oxalate ligand coordinating two Cu^I ions via two pairs of O atoms. Two triphenyl­phosphine ligands also coordinate each symmetry-related Cu^I ion, resulting in a distorted tetra­hedral geometry [O—Cu—O = 80.57 (5)° and P—Cu—P = 125.72 (2)°]. In the crystal, there are two dichloro­methane solvent mol­ecules for each dinuclear complex.

Dimethyl 2-amino­biphenyl-4,4′-di­carboxyl­ate

The title compound, C₁₆H₁₅NO₄, exhibits two near-planar aromatic ester groups with a maximum aryl–ester torsion angle of 1.9 (2)°. The dihedral angle between the benzene rings is 44.7 (1)°. In the crystal, N—H...O hydrogen bonding is observed along with C—H...O contacts, forming chanins along [101]. No π–π inter­actions were noted between the benzene rings.

4,4′-Oxybis(2,6-di­methyl­pyridinium) bis­(tri­fluoro­methane­sulfonate)

In the asymmetric unit of the title salt, C₁₄H₁₈N₂O²⁺·2CF₃O₃S⁻, the components are linked by two N—H...O and one C—H...O hydrogen bonds. The dipyridinium salt demonstrates a skew conformation based upon C—O—C—C torsion angles of 61.5 (3) and 15.1 (4)°. A C—O—C angle of 119.3 (2)° and C—O bond distances of 1.364 (3) and 1.389 (3) Å are consistent with other dipyridyl ethers. The planes of the pyridyl rings exhibit a twist angle of 67.89 (8)°. One of the tri­fluoro­methane­sulfonate ions shows disorder of the F atoms [in a 0.52 (7):0.48 (7) occupancy ratio] and an O atom [0.64 (8):0.36 (8) occupancy ratio]. In the crystal, the components are linked by C—H...O inter­actions, which form chains along [101].