No abstract

An X-ray diffraction study of [(THF)(C2H3)GaFe(CO)4]2 (THF = tetrahydrofuran) reveals a dimeric, planar, four-membered, metal-metal-bonded ring structure analogous to the isoelectronic [(bpy)ZnFe(CO)4]2 and [(C2H5)2GeFe(CO)4]2 structures (bpy = 2,2'-bipyridine). Several distortions are observed in the structure that can be attributed to partial ionic character and the resultant bending of the axial carbonyl ligands over the metal ring. These distortions are intermediate in degree between those observed in the above-mentioned isoelectronic dimers and include a contraction of the M-Fe-M bond angle and a twisting of the idealized Fe(CO)4 tetrahedra to opposite sides of the centrosymmetric dimers. The distortions arise in order to help maintain Oax---Oax nonbonded contacts at no less than ca. 3.04 A. A number of comparisons have been made between the isoelectronic dimers. Other parameters of interest include Ga-Fe = 2.516 (3) Á, Ga-C = 2.069 (5) A, Ga-O = 2.129 (4) A, Fe-C(ax) = 1.775 (4) A, Fe-C(eq) = 1.788 (3) A, /Ga-Fe-Ga = 71.55 (4)°, ZFe-Ga-Fe = 108.45 (4)°, and zCax-Fe-Cax = 156.85 (21)°. The structure has been refined (Mo Ka radiation) to a conventional R index (on F) of 0.036 for 2650 unique reflections having I > 3

The molecule exhibits axial substitution of the ligand. N atoms in the ligand display planar geometry, with P-N bond lengths notably shortened.

No abstract

IR‐Untersuchungen an bekanntem(NH3)3‐ ZnFe(CO)4 bestätigen seine monomere Natur.