Synthesis, structure and antibacterial activity of ferrocenyl diphopshine chelated iron – telluride cluster

Synthesis and molecular structures of the 52-electron triiron telluride clusters [Fe3(CO)8(μ3-Te)2(κ2-diphosphine)] - Electrochemical properties and activity as proton reduction catalysts

“…It is not clear whether this is an intermediate in the formation of 2. The preparation of the 1,1'bis(diphenylphosphino)ferrocene (dppf) derivative 6 in 72% yield from the reaction of 1 and dppf in CH 2 Cl 2 at room temperature has also been reported [42]. All new clusters were characterised spectroscopically.…”

“…at 2063w, 2040vs, 2002s and 1970m cm -1 for the dppbn derivative) that are shifted to higher frequencies than those in 2-7. Chatterjee and coworkers prepared [Fe 3 (CO) 9 (µ 3 -Te) 2 (κ 1 -dppf)], with the dppf ligand in a monodentate "dangling" coordination mode, from the reaction of 1 with dppf at -10 o C [42] and Rauchfuss and coworkers identified the clusters [Fe 3 (CO) 9 (µ 3 -Te) 2 (κ 1 -diphosphine)]…”

Structural Variety of Iron Carbonyl Clusters Featuring Ferrocenylphosphines

“…The dichlorophosphines 5, 6 and 9 were reacted with an excess of Fe 2 (CO) 9 (10) in different ratios in toluene (see below and the Experimental Section). The mixtures were placed in a 45-50°C pre-heated oil bath to control reaction time precisely.…”

“…The 'closed' butterfly structure in 15-17 causes a high-field shift of the PÀ H and PÀ Cl resonances compared to 'open' 12 ac, probably caused by an intramolecular transfer of electron density from the ferrocenyl core of the more rigid 1,1'substitution pattern. [10] The endo-PÀ P entities in 18, 19 and 20 resonate at 119-170 ppm, which is significantly low-field shifted compared to alkyl-substituted [2]ferrocenophanes, that are observed at 21 ( t Bu) [34] and 42 ppm (NEt 2 ) [33a] . Compounds 19 and 20 exhibit two signals in their 31 P{ 1 H} NMR spectra.…”

“…[5][6][7] Their use as, e. g. hydrogenase biomimetics, [5,6b,8] reduction catalysts [9] and antibacterial agents have been explored. [10] It was in this respect, that 1,1'bisphosphino ferrocenes Fe(η 5 -C 5 H 4 PR 2 ) 2 (R = alkyl, aryl), com-monly used as chelating ligands for mono and multimetallic metal carbonyl building blocks, [5,6,7,11] can interact with their iron center towards the coordinated metal M in a k 3 mode. Especially, for M = Fe, Ni an inverse charge transfer from Fe II to M I occurs.…”