55451-49-5Relevant academic research and scientific papers
Synthesis and characterisation of halide, separated ion pair, and hydride cyclopentadienyl iron bis(diphenylphosphino)ethane derivatives
Patel, Dipti,Wooles, Ashley,Cornish, Andrew D.,Steven, Lindsey,Davies, E. Stephen,Evans, David J.,McMaster, Jonathan,Lewis, William,Blake, Alexander J.,Liddle, Stephen T.
, p. 14159 - 14177 (2015/08/18)
Treatment of anhydrous FeX2 (X = Cl, Br, I) with one equivalent of bis(diphenylphosphino)ethane (dppe) in refluxing THF afforded analytically pure white (X = Cl), light green (X = Br), and yellow (X = I) [FeX2(dppe)]n (X = Cl, I; Br, II; I, III). Complexes I-III are excellent synthons from which to prepare a range of cyclopentadienyl derivatives. Specifically, treatment of I-III with alkali metal salts of C5H5 (Cp, series 1), C5Me5 (Cp, series 2), C5H4SiMe3 (Cp′, series 3), C5H3(SiMe3)2 (Cp′′, series 4), and C5H3(But)2 (Cptt, series 5) afforded [Fe(Cp?)(Cl)(dppe)] 1Cl-5Cl, [Fe(Cp?)(Br)(dppe)] 1Br-5Br, and [Fe(Cp?)(I)(dppe)] 1I-5I (Cp? = Cp, Cp, Cp′, Cp′′, or Cptt). Dissolution of 1I-5I in acetonitrile, or treatment of 1Cl-5Cl with Me3SiI in acetonitrile (no halide exchange reactions were observed in other solvents) afforded the separated ion pair complexes [Fe(Cp?)(NCMe)(dppe)][I] 1SIP-5SIP. Attempts to reduce 1Cl-5Cl, 1Br-5Br, and 1I-5I with a variety of reductants (Li-Cs, KC8, Na/Hg) were unsuccessful. Treatment of 1Cl-5Cl with LiAlH4 gave the hydride derivatives [Fe(Cp?)(H)(dppe)] 1H-5H. This report provides a systematic account of reliable methods of preparing these complexes which may find utility in molecular wire and metal-metal bond chemistries. The complexes reported herein have been characterised by X-ray diffraction, NMR, IR, UV/Vis, and M?ssbauer spectroscopies, cyclic voltammetry, density functional theory calculations, and elemental analyses, which have enabled us to elucidate the electronic structure of the complexes and probe the variation of iron redox properties as a function of varying the cyclopentadienyl or halide ligand.
Synthesis and solvent induced halide exchange of the electron rich, half sandwich complexes [FeI(dppe)Cp] and [MoX(dppe)(η7-C 7H7)] (X = Br, Cl; Dppe = Ph2PCH 2CH2PPh2)
El-Tarhuni, Sarah,Ho, Monica,Kawser, Mohammed H.,Shi, Saiqin,Whiteley, Mark W.
, p. 30 - 36 (2014/01/17)
Improved synthetic routes to [FeI(dppe)Cp], and [MoX(dppe) (η7-C7H7)] (X = Br, Cl) are described. [FeI(CO)2Cp] reacts with dppe in refluxing toluene to give multi-gram quantities of [FeI(dppe)Cp], 3 without the
The intriguing substitution behavior of CO with bidentate phosphine ligands induced by a gem-dialkyl effect
Van Rijn, Jimmy A.,Gouré, Eric,Siegler, Maxime A.,Spek, Anthony L.,Drent, Eite,Bouwman, Elisabeth
, p. 1899 - 1903 (2011/06/19)
The reaction of the complexes [FeCpX(CO)2] (X = Cl, Br, I) into either [FeCp(CO)(PP)]X or [FeCpX(PP)] (PP = a bidentate diphosphine ligand) is shown to be highly dependent of the phosphine ligand used. Diphosphine ligands that form stable chelates favor formation of the neutral complex, whereas diphosphine ligands that form less stable chelates favor formation of the cationic complex. Thus, with the use of dppdmp (= 1,3-bis(diphenylphosphino)-2, 2-dimethylpropane) the [FeCpX(PP)] complexes (X = Cl, Br, I) are selectively formed, induced by a gem-dialkyl effect. Apart from the bidentate phosphine ligand, the halide ion present in the iron complex has a significant influence on the course of the substitution reaction.
Compromise between conjugation length and charge-transfer in nonlinear optical η5-monocyclopentadienyliron(II) complexes with substituted oligo-thiophene nitrile ligands: Synthesis, electrochemical studies and first hyperpolarizabilities
Garcia, M. Helena,Mendes, Paulo J.,Robalo, M. Paula,Dias, A. Rom?o,Campo, Jochen,Wenseleers, Wim,Goovaerts, Etienne
, p. 3027 - 3041 (2008/02/02)
A systematic series of η5-monocyclopentadienyliron(II) complexes with substituted oligo-thiophene nitrile ligands of general formula [FeCp(P_P)(NC{SC4H2}nNO2)][P F6] (P_P = dppe, (+)-diop;
Organometallic complexes for second-order non-linear optics: Synthesis and molecular quadratic hyperpolarizabilities of η5-monocyclopentadienyliron(II) nitrile derivatives with different phosphines. X-ray crystal structure of [FeCp(DPPE)(p-NCC<
Garcia, M. Helena,Robalo, M. Paula,Dias,Piedade, M. Fátima M.,Galv?o, Adelino,Wenseleers, Wim,Goovaerts, Etienne
, p. 252 - 264 (2007/10/03)
New complexes of the type [FeCp(P_P)(p-NCR)][PF6] (P_P=(S)-PROLOPHOS, DPPE and (R)-PROPHOS ((S)-PROLOPHOS=(S)-N-(diphenylphosphino)-2- diphenylphosphinooxymethylpyrrolidine; DPPE=1,2-bis(diphenylphosphino)ethane; (R)-PROPHOS=(R)-(+)-1,2-bis(dip
Synthesis and oxidation of cationic heterobinuclear cyanide-bridged complexes of manganese and iron
Barrado, Georgina,Carriedo, Gabino A.,Diaz-Valenzuela, Carlos,Riera, Victor
, p. 4416 - 4420 (2008/10/08)
Several heterobinuclear cyanide-bridged cationic complexes of the type [LnM1-CN-M2Ln]+, where LnM1 and LnM2 are the fragments Fe(C5H5)(dppe) or cis- or trans-Mn(CO)2(L-L)L [L-L = dppm, dppe; L = P(OPh)3, PEt3; dppe = Ph2P(CH2CH2)PPh2; dppm = Ph2P(CH2)PPh2], have been prepared as hexafluorophosphate salts by reacting the appropriate mononuclear complexes LnM1-CN and X-M2Ln (X = Br, I) in the presence of TlPF6 or (NH4)PF6 as halogen abstractors. The oxidation of these compounds have been studied electrochemically by cyclic voltammetry and chemically by infrared spectroscopy. The results indicated that the first oxidation of the cations affects the Fe or Mn fragment depending on its position relative to the cyanide bridge and the stereochemistry (cis or trans) of the dicarbonyl fragments. When the oxidation affects a cis-Mn(CO)2(L-L)L moiety, a very rapid isomerization to the trans form is observed and, in the case of the cis-dicarbonyl complexes [(C5H5)(dppe)Fe-CN-Mn(CO)2(L-L)L]+, the first oxidation takes place at Fe but is followed by electron transfer to Mn with concomitant isomerization to the trans-dicarbonyl form.
