Synthesis, characterization and structural elucidation of water-soluble 1-aminoalkane and α,ω-diaminoalkane complexes of the pentamethylcyclopentadienyliron dicarbonyl cation, [Cp∗(CO)2Fe]+

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.…”

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

“…1.59 ppm downfield relative to those of cyclopentadienyl 1-aminoalkane complexes [20], and ca. 2.19 ppm downfield relative to pentamethylcyclopentadienyl 1-aminoalkane complexes [22]. The 13 C NMR spectrum of the complex exhibited a single peak at 86.7 ppm corresponding to the Cp carbons and a single carbonyl peak at 211.1 ppm.…”

“…In the IR spectra of compounds 3e9, the n(CO) bands are in the expected range for terminal carbonyl groups of amine-coordinated iron dicarbonyl complexes [20,22]. The infrared spectra of the Cp* complexes 4 and 6 show the n(CO) bands at lower frequencies than their Cp counterparts due to the electron releasing ability of the pentamethylcyclopentadienyl ligand which consequently increases the metal / carbon back donation.…”

“…The stability of compound 5 in water was further demonstrated by the counter anion exchange reaction with NaBPh 4 in deionized water to form [Cp(CO) 2 Fe(NH 2 CH 2 C 6 H 4 OCH 3 )]BPh 4 (7) which was also fully characterized. Assignment of 1 H NMR and 13 [20] and [Cp*(CO) 2 Fe {CH 2 (CH 2 ) n CH 3 }]BF 4 [22].…”