Bis{1-[2-(diphenyl­phosphan­yl)eth­yl]-3-ethyl­imidazol-2-yl­idene}nickel(II) diiodide acetonitrile disolvate

The mol­ecular structure of the title compound, [Ni(C₁₉H₂₁N₂P)₂]I₂·2CH₃CN, shows two six-membered N-heterocyclic carbene/phosphane chelate rings that form a nearly square-planar coordination geometry around the Ni^II atom, which lies 0.190 (1) Å above the C₂P₂ plane. The sum of the bond angles at the Ni^II atom is 358.68 (6)°, with C-Ni-P bite angles of 82.89 (5) and 84.08 (6)°. The two carbene rings make a dihedral angle of 52.65 (8)°.

Tricarbonyl­bis­(1,3-diisopropyl-4,5-dimethyl­imidazol-2-yl­idene)iron

In the title compound, [Fe(C₁₁H₂₀N₂)₂(CO)₃], the Fe atom shows a distorted trigonal–bipyramidal geometry with three carbonyl and two carbene ligands. The latter have a cis arrangement, with a C—Fe—C angle of 90.60 (7)°. The Fe atom lies 0.007 (1) Å above the basal plane defined by two carbonyl and one carbene C atoms. The mol­ecular structure is closely related to that of the isomolecular but not isotypic Ru complex with an identical cis arrangement, so, in general, bond geometries lie in expected ranges. In the crystal, C—H...O hydrogen bonds link the mol­ecules into infinite zigzag chains extending along [010].