X-RAY CRYSTAL-STRUCTURE OF [FERH(CO)(6)(MU-P(T)BU(2))](FE-RH) - A MOLECULE WITH 2 SEMIBRIDGING CARBONYL LIGANDS

The structure of the phosphido-bridged heterobimetallic complex [FeRh( CO)(6)(mu-P(t)Bu(2))] (1) has been established by X-ray analysis. 1 cr ystallizes in space group P (1) over bar with four molecules per unit cell, the two crystallographically unrelated molecules are practically identical. By ignoring the Fe-Rh bond, the Fe atom has in good approx imation a trigonal bipyramidal and the Rh atom an irregular coordinati on sphere. As indicated by the bonding geometry, two carbonyl ligands of the iron atom are weakly semibridging to the Rh atom.