A copper(II)–oxalate compound resulting from the fixation of carbon dioxide: μ-oxalato-bis­[bis­(1-benzyl-1H-pyrazole)(trifluoro­methane­sulfonato)copper(II)]

Reductive coupling of adventitious CO₂ by Cu^I has afforded the title compound, μ-oxalato-1κ²O¹,O²:2κ²O^1′,O^2′-bis­[bis­(1-benzyl-1H-pyrazole-κN²)(trifluoro­methane­sulfonato-κO)copper(II)], [Cu₂(CF₃O₃S)₂(C₂O₄)(C₁₀H₁₀N₂)₄], which contains centrosymmetric mol­ecules in which the Cu^II ions, bridged by a planar oxalate ligand, exhibit a distorted square-pyramidal N₂(pyrazole)O₂(oxalato)O(trifluoro­methane­sulf­on­ate) coordination geometry, with the trifluoro­methane­sulfonate ligand coordinated axially. The mol­ecule exhibits five intra­molecular C—H...O,F hydrogen bonds per asymmetric unit, which help to stabilize the mol­ecule and to orient the benzyl and trifluoro­methane­sulfonate groups. Inter­molecular C—H...O hydrogen bonds link the mol­ecules to form two-dimensional layers.

Bis[(S,S)-1,2-dimethoxy-1,2-bis­(1-methyl-1H-benzimidazol-2-yl)ethane]palladium(II) dichloride

Chiral crystals of the title salt, [Pd(C₂₀H₂₂N₄O₂)₂]Cl₂, contain [Pd(L1)₂]²⁺ cations [L1 is (S,S)-1,2-dimethoxy-1,2-bis­(1-methyl-1H-benzimidazol-2-yl)ethane] separated by disordered Cl^- anions. Two geometrically constraining L1 ligands coordinate each Pd^II ion facially to yield a distorted tetra­gonal N₄(imine)+O₂(meth­oxy) coordination geometry.