200487-96-3Relevant academic research and scientific papers
Iron(II) Complexes Containing the 1,2-Diphospholanoethane Ligand
Field, Leslie D.,Thomas, Iain P.,Hambley, Trevor W.,Turner, Peter
, p. 612 - 618 (1998)
The synthesis and crystal structure of cis-Fe(BPE5)2Cl2 (BPE5 = 1,2-diphospholanoethane), the first symmetrical cis-Fe(PP)2Cl2 (PP = bidentate phosphine), is reported (monoclinic, P21/n, a = 12.084(3) ?, b = 14.059(2) ?, c = 17.665(2) ?, β = 101.77(1)°, Z = 4). The overall structure and Fe-P and Fe-Cl bond lengths of cis-Fe-(BPE5)2Cl2 more closely resemble those in Fe(PP3)Cl2 complexes (PP3 = tripodal, tetradentate phosphine ligand) than in other Fe(PP)2Cl2 complexes. In solution, cis-Fe(BPE5)2Cl2 exhibits temperature-dependent paramagnetic behavior due to reversible dissociation of chloride. The dissociation of chloride was exploited in the synthesis of Fe(BPE5)2X2 (X = Br, I) and [Fe(BPE5)2(L)(Cl)]+ (L = CO, PMe3). The crystal structure of [cis-Fe(BPE5)2-(CO)(Cl)][BPh4] is reported (monoclinic, P21/a, a = 12.938(3) ?, b = 29.647(4) ?, c = 13.131(3) ?, β = 107.89(2)°, Z = 4). The relative chelation strength of BPE5 in Fe(PP)2Cl2 complexes is BPE5 ≈ DMPE > DEPE > DPrPE [DMPE = 1,2-bis(dimethylphoshino)ethane; DEPE = 1,2-bis(diethylphoshino)ethane; DPrPE = bis(di-n-propylphosphino)ethane].
