Lc. Song et al., THE FIRST MU(4)-SE SPIRO-TYPE FE4SE3 CLUSTER - [(MU-4-CH3-C6H4SE)FE-2(CO)(6)](2)(MU(4)-SE), Acta crystallographica. Section C, Crystal structure communications, 52, 1996, pp. 1357-1359
In the molecule of the title cluster compound, mu(4)-selenido-bis [mu-
(4-tolylselenido)-hexacarbonyldiiron], two identical (mu-4-CH3C6H4Se)F
e-2(CO)(6) moieties are joined by a spiro-type four-coordinate Se atom
, mu(4)-Se. The four Se-Fe bond lengths around the central Se atom are
2.353 (3), 2,353 (3), 2.347 (3) and 2.358 (3) Angstrom. The average (
2.353 Angstrom) is shorter than that (2.392 Angstrom) of Se-Fe bond le
ngths formed between Fe atoms and the 4-tolylselenido ligands. In each
diiron subcluster core, the 4-tolylselenido ligand is bridged between
two Fe atoms.