TY - JOUR
T1 - O-Phenylenebis(Dimethylarsine)Decacarbonyltriiron. Preparation and Structure of a Compound with Two Semibridging Carbonyl Ligands
AU - Bino, Avi
AU - Cotton, F. Albert
AU - Lahuerta, Pascual
AU - Puebla, P.
AU - Uson, R.
PY - 1980
Y1 - 1980
N2 - The reaction of Fe2(CO)9 with o-phenylenebis(dimethylarsine) (diars) under a dynamic atmosphere of argon (to sweep out CO) allows the isolation of the title compound, (diars) Fe3(CO)10. The structure of this dark brown crystalline compound has been investigated by X-ray crystallography. The crystals are monoclinic, and a unit cell in space group P21/n has dimensions of a = 9.538 (2) Å, b = 11.101 (2) Å, c = 21.070 (3) Å, β = 99.81 (1)°, V= 2580 (1) Å3, and Z = 4. The molecules consist of triangular Fe3 clusters with the diars chelated to Fe(l). There are no symmetrically bridging CO groups, but one CO group from Fe(2) and one from Fe(3) lean toward Fe(l) and may be described as semibridging CO groups with Fe(l)-C distances of 2.23 ± 0.01 Å. These two semibridging CO groups may be assigned the role of accepting electron density from the electron-rich Fe(l) atom. The two semibridging CO groups are on opposite sides of the Fe3 plane, and there is a concerted twist of all other ligand atoms so that the only symmetry element retained by the molecule is a twofold axis passing through Fe(l) and bisecting the Fe(2)-Fe(3) bond. The Fe-Fe bonds with the semibridging CO groups are appreciably shorter, 2.602 (1) and 2.597 (1) Å, than the third one, 2.662 (1) Å, between Fe(2) and Fe(3).
AB - The reaction of Fe2(CO)9 with o-phenylenebis(dimethylarsine) (diars) under a dynamic atmosphere of argon (to sweep out CO) allows the isolation of the title compound, (diars) Fe3(CO)10. The structure of this dark brown crystalline compound has been investigated by X-ray crystallography. The crystals are monoclinic, and a unit cell in space group P21/n has dimensions of a = 9.538 (2) Å, b = 11.101 (2) Å, c = 21.070 (3) Å, β = 99.81 (1)°, V= 2580 (1) Å3, and Z = 4. The molecules consist of triangular Fe3 clusters with the diars chelated to Fe(l). There are no symmetrically bridging CO groups, but one CO group from Fe(2) and one from Fe(3) lean toward Fe(l) and may be described as semibridging CO groups with Fe(l)-C distances of 2.23 ± 0.01 Å. These two semibridging CO groups may be assigned the role of accepting electron density from the electron-rich Fe(l) atom. The two semibridging CO groups are on opposite sides of the Fe3 plane, and there is a concerted twist of all other ligand atoms so that the only symmetry element retained by the molecule is a twofold axis passing through Fe(l) and bisecting the Fe(2)-Fe(3) bond. The Fe-Fe bonds with the semibridging CO groups are appreciably shorter, 2.602 (1) and 2.597 (1) Å, than the third one, 2.662 (1) Å, between Fe(2) and Fe(3).
UR - http://www.scopus.com/inward/record.url?scp=4243518691&partnerID=8YFLogxK
U2 - 10.1021/ic50210a036
DO - 10.1021/ic50210a036
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AN - SCOPUS:4243518691
SN - 0020-1669
VL - 19
SP - 2357
EP - 2359
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 8
ER -