(μ-Ethane-1,2-diamine-κ2 N:N′)bis­[dicarbon­yl(η5-cyclo­penta­dien­yl)iron(II)] bis­(tetra­fluorido­borate)

The asymmetric unit of the title compound, [Fe2(C5H5)2(C2H8N2)(CO)4](BF4)2, contains two half-cations, each located on a center of symmetry, and two tetra­fluorido­borate anions. The iron atoms adopt a three-legged piano-stool geometry. All amine H atoms are involved in N—H⋯F hydrogen bonds, which consolidate the crystal packing along with weak C—H⋯O and C—H⋯F inter­actions

Acetonitrile­dicarbon­yl(η5-penta­methyl­cyclo­penta­dien­yl)iron(II) tetra­fluorido­borate

In the structure of the title compound, [Fe{η5-C5(CH3)5}(NCCH3)(CO)2]BF4, the arrangement of ligands around the Fe atom is in a pseudo-octa­hedral three-legged piano-stool fashion in which the penta­methyl­cyclo­penta­dienyl (Cp*) ligand occupies three apical coordination sites, while the two carbonyl and one acetonitrile ligands form the basal axes of the coordination. The Fe—N bond length is 1.924 (3) Å and the Fe—Cp* centroid distance is 1.722 Å

(μ-Formato-κ 2 O:O′)bis­[dicarbon­yl(η 5-cyclo­penta­dien­yl)iron(II)] tetra­fluoridoborate

In the structure of the title compound [Fe2(C5H5)2(CHO2)(CO)4]BF4, each FeII atom is coordinated in a pseudo-octa­hedral three-legged piano-stool fashion. The cyclo­penta­dienyl ligand occupies three fac coordination sites while the two carbonyl ligands and formate O atom occupy the remaining three sites

Dicarbon­yl(η5-cyclo­penta­dien­yl)bis­(trimethyl­phosphine)molybdenum(II) trifluoro­methane­sulfonate

In the title compound, [Mo(C5H5)(CO)2(C3H9P)2]CF3SO3, the cationic complex displays a classical four-legged piano-stool square-pyramidal geometry with a trans configuration of the basal ligands around the Mo atom. The cyclo­penta­dienyl (Cp) ligand occupies the apical position of the piano-stool configuration. The average Mo—P bond length of the two trans PMe3 ligands is 2.474 (5) Å and the Mo—Cp centroid distance is 2.003 (2) Å

A Structural Investigation of the D2O Solvated, Acetone Solvated and Nonsolvated 1,4-Diazabicyclo[2.2.2]octane Complexes of the Half Sandwich Moiety [(η 5-C5H5)(CO)2Fe]

Two new solvates of the dinuclear salt {(η 5-C5H5)(CO)2Fe}2(μ-DABCO)](BF4)2 (DABCO = 1,4-diazabicyclo[2.2.2]octane); 1 (D2O solvate) and 2 (acetone solvate), and the mononuclear salt [(η 5-C5H5)(CO)2Fe(DABCO)]BF4, 3, have been synthesized and structurally characterized. The D2O solvate, 1 forms crystals in the triclinic space group P1, the acetone solvate forms crystals in the monoclinic P21/c space group, while the unsolvated mononuclear salt, 3, forms crystals in the orthorhombic P212121 space group. The respective unit cell parameters are: Compound 1, a = 7.66300(10) Å, b = 12.3133(2) Å, c = 13.9629(2) Å, α = 69.179(1) °, β= 77.114(1) ° and γ = 84.282(1) °; Compound 2, a = 17.3633(3) Å, b = 14.1688(3) Å, c = 11.3542(2) Å, β = 99.344(1) °; Compound 3, a=8.9936(2) Å, b=10.8949(3) Å, c=15.3417(4) Å. The DABCO ligand adopts a twisted conformation with N-C-C-N torsion angles ranging between –21.05(12) to –19.31(12) ° and 15.3(2) –15.7(2) ° in 1 and 2, respectively, whereas in 3, the CH2 groups of each NCH2CH2N moiety are almost eclipsed, the torsion angles ranging from –2.89(18) to –1.50(16) °.KEYWORDS Cyclopentadienyliron dicarbonyl complex, 1,4-diazabicyclo[2.2.2]octane (DABCO), X-ray crystallography

Dicarbonyl(hexamethylene-1,3,5,7-tetramine-κN1)(η5-pentamethylcyclopentadienyl)iron(II) tetrafluoridoborate

In the title compound, [Fe(C10H15)(C6H12N4)(CO)2]BF4, the arrangement around the FeII atom corresponds to a three-legged piano stool. The pentamethylcyclopentadienyl (Cp*) ligand occupies three coordination sites, while two CO ligands and one N atom of the hexamethylenetetramine ligand occupy the remaining coordination sites, completing a pseudo-octahedral geometry. Both the complex cation and the BF4− anion reside on crystallographic mirror planes. The Fe—N bond length is 2.069 (2) and the Fe—Cp*(centroid) distance is 1.7452 (3) Å