(μ-Ethane-1,2-diamine-κ²N:N′)bis[dicarbonyl(η⁵-cyclopentadienyl)iron(II)] bis(tetrafluoridoborate)

Abstract

Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.003 Å; R factor = 0.033; wR factor = 0.084; data-to-parameter ratio = 18.0.The asymmetric unit of the title compound, [Fe 2 (C 5 H 5 ) 2 -(C 2 H 8 N 2 )(CO) 4 ](BF 4 ) 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-HÁ Á ÁF hydrogen bonds, which consolidate the crystal packing along with weak C-HÁ Á ÁO and C-HÁ Á ÁF interactions. Related literature

Regioselective reactions of electrophilic iron dicarbonyl cations, [(η5-C5R5)(CO)2Fe]+ (R = H, CH3) with heterofunctional amine ligands

“…Calc. for C 21 To the filtrate, diethyl ether was added until an orange precipitate formed. The precipitate was allowed to settle for 1 h after which the mother liquor was syringed off and the precipitate washed with four portions of diethyl ether and dried under reduced pressure to give 10 as an orange microcrystalline solid.…”

Reactions of N-heterocyclic ligands with substitutionally labile organometallic complexes, [(η5-C5R5)Fe(CO)2E]BF4

“…The two {Cp(CO) 2 Fe} units are linked by the HMTA ligand through the nitrogen atoms in which the coordination geometry around Fe can be described as distorted octahedral with three sites occupied by a cyclopentadienyl ligand, while the two carbonyls and the HMTA ligand occupy the remaining three sites. The Fe-N bond distances were found to be 2.0817(17) and 2.0858(18) Å, which are comparable to the 2.092(4) Å in [(CO) 4 Fe(DABCO) [30], but longer than the Fe-N bond lengths previously reported for cyclopentadienylirondicarbonyl amine complexes [44,48,50]. The three carbon atoms adjacent to the iron centre form a base with a distorted tetragonal geometry about nitrogen with N-C bonds in the range 1.514 ± 0.010 Å. Valence angles are: Fe-N-C, 111.89 ± 1.51°and C-N-C, 106.94 ± 0.84°.…”

“…The IR spectra of compounds 3a-4b show two strong absorption bands in the range 2058-1982 cm À1 assignable to the two terminal carbonyls as expected for cationic amine complexes [44,[48][49][50]. The IR spectra of 4a and 4b exhibited characteristic v(CO) stretching vibrations at wavenumbers lower than those of 3a and 3b by ca.…”

“…Iron is also found in the blood of both vertebrates and invertebrates in which it forms Fe-N bonds in the heme group of hemoglobin or myoglobin. To the best of our knowledge HMTA, DABCO and 1-meIm complexes with the {(g 5 4 (R = H, CH 3 ; 1-meIm = 1-methylimidazole), which is a part of an on-going study on functionalized transition metal alkyl complexes [41][42][43][44][45][46][47][48].…”

Acetonitriledicarbonyl(η5-pentamethylcyclopentadienyl)iron(II) tetrafluoridoborate

“…The title compound (I) was obtained as a side product in our ongoing investigation of the reactions of substitutionally unsaturated metal complexes with nitrogen donor ligands (M'thiruaine, Friedrich, Changamu & Bala, 2011;M'thiruaine, Friedrich, Changamu & Omondi, 2011). The compound has been previously reported as the product of oxidative cleavage of the Fe-Fe bond in [η 5 -C 5 (CH 3 ) 5 Fe(CO) 2 ] 2 in acetonitrile and also as a product of the reaction between [η 5 -C 5 (CH 3 ) 5 Fe(CO) 2 (THF)]BF 4 and acetonitrile (Catheline & Astruc 1984), but its crystal structure has not been reported.…”