Interaction of vinylgermanes with iron carbonyls. X-ray crystal structure of the Ge[Fe(CO)4]4 complex

Synthesis and Structures of an Unusual Germanium(II) Calix[4]arene Complex and the First Germanium(II) Calix[8]arene Complex and Their Reactivity with Diiron Nonacarbonyl

“…The longer Ge−Fe and shorter Fe−Fe distances in 8 versus those in 7 are likely a result of the attachment of the two germanium atoms in 7 to electron-withdrawing phenolic oxygen atoms versus a second Fe 2 (CO) 8 2- moiety in 8 . The average Fe−Ge−Fe bond angle in 8 (among the two structure reports) is 71.9(1)° while the average Ge−Fe−Fe bond angle is 54.0(1)°, , both of which are more acute than the corresponding angles in 7 due to the spirocyclic geometry in 8 .…”

“…The spirocyclic complex Ge[Fe 2 (CO) 8 ] 2 ( 8 ) − contains two Fe 2 (CO) 8 2- groups bridged by a bare germanium atom, and the structure of 8 has been reported on two separate occasions. , The two reported structures that were determined are nearly identical, with one having an average Ge−Fe distance of 2.40(1) Å and an average Fe−Fe bond length of 2.823(2) Å 44 and the other having average Ge−Fe and Fe−Fe distances of 2.407(2) and 2.823(3) Å, respectively …”

“…The geometries at the iron atoms in 7 and 8 are identical but the C−O bond lengths in 7 are shorter than the corresponding distances in 8 , again resulting from the germanium atoms in 7 being bound to electron-withdrawing phenolic oxygen atoms. The average of the bond distances for the C−O groups pointing outward from the GeFe 2 triangle (C(15)−O(6) and C(22)−O(7)) in 7 is 1.120(4) Å while the corresponding C−O groups for 8 have an average distance of 1.134(7) Å . The three sets of C−O distances remaining in 7 average 1.135(4), 1.140(4), and 1.132(4) Å while the corresponding average distances in 8 are 1.140(7), 1.138(7), and 1.148(7) Å …”

The Interface of Main Group and Transition Metal Cluster Chemistry

“…These lone pairs are basic and are observed to donate to other metal fragments (eqn 122). 21 The phosphorus-phosphorus bond distance is slightly longer when the phosphorus is complexed to an external metal fragment.…”

Reaction of Fe2(CO)9with Lithium: Preparation and Structures of Compounds with Strong Ion Pairing

“…The [Fe 2 (CO) 8 ] 2- moiety can act as a bidentate ligand to various main group elements − or transition metals, and in all cases coordination occurs via the iron atoms. Upon coordinating to a metal M, the “ligand” [Fe 2 (CO) 8 ] 2- may be present with all terminal (mode A ) or with two bridging CO groups (mode B ) as depicted in Scheme .…”