Structure of cis-dihydridotetrakis(diethyl phenylphosphonite)iron(II)

The crystal structure of chlorotris(diethyl phenyl phosphonite)bis(4-tolyl isocyanide)iron(II) perchlorate

“…This difference is consistent with the greater n-acceptor ability of P(OC6Hs)3 in comparison with P(C6Hs)3. The values found in the present compound (2.236, 2.234, 2.248 A) lie at the upper limit of the range observed for phosphine derivatives; moreover they are surprisingly long compared with those (2.128, 2.150 A) found in FeHz[PPh(OEt)2]4 (Guggenberger et al, 1972), where the arrangement of the ligands around Fe is intermediate between octahedral and tetrahedral. This lengthening can be explained by the presence of the isocyanide groups, which are strong n-acceptors and make the diethyl phenyl phosphonite molecule a weaker n-acceptor in our compound than in the dihydrido derivative.…”

“…With the aim of understanding better the influence of the nature of the metal atom and of the ligands on the extent of the M-L n-interaction, we have studied the molecular structure of {FeCI(4-CH3C6H4NC)2[PPh(OEt)2]3}CIO4 in which the presence of two strong n-acceptor isocyanide ligands should make the diethyl phenyl phosphonite a weaker n-acceptor than in FeH2[PPh(OEt)2]4 (Guggenberger, Titus, Flood, Marsh, Orio & Gray, 1972).…”

Iron Dihydride Complexes: Synthesis, Reactivity, and Catalytic Applications

“…Thus, H 2 Fe(PMePh 2 ) 4 was prepared readily from FeCl 2 ⋅ 2H 2 O, PMePh 2 , and NaBH 4 in refluxing EtOH even when the phosphine to iron ratio was kept at ∼3 . Similar strategy was successfully used for the synthesis of H 2 Fe(PR 2 Ph) 4 (R=Me, Et), H 2 Fe(HPPh 2 ) 4 , H 2 Fe{P(OEt) 3 } 4 ,, and H 2 Fe{PPh(OR) 2 } 4 (R=Et, i ‐Pr) ,. This protocol applied to FeCl 2 and PR 3 (R=Me, Et), however, led to the isolation of both H 2 Fe(PR 3 ) 4 and cationic complexes shown in Figure .…”

“…Solid‐state structures of H 2 Fe(CO) 4 , H 2 Fe(CO) 3 (AsPh 3 ), H 2 Fe(CO) 2 (P(OPh) 3 ) 2 ,, H 2 Fe(H 2 )(PEtPh 2 ) 3 , H 2 Fe(N 2 )(PEtPh 2 ) 3 , H 2 Fe(PMePh 2 ) 4 , and H 2 Fe(PPh(OEt) 2 ) 4 have been investigated by electron, X‐ray, or neutron diffraction. In all cases, the hydride ligands were found to be cis to each other .…”

A three-ringexo-polyhedral-cyclized nickelaundecaborane cluster: [(CH3COS)3NiB10H7(PPh3)]

“…The Ni7--S1, Ni7--S2 and Ni7--S3 distances are 2.3766 (14), 2.3405 (13) and 2.2469 (13) A, respectively, which are consistent with the corresponding Ni--S bond lengths in the cluster [(PhCOS)3NiBI0HT(PPh3)] (Dou, Hu, Sun et al, 1997). The distances Ni7--B3 [2.082 (4) ~,], Ni7--B8 [2.109 (4) A] and Ni7--B 11 [2.112 (4) A] are significantly shorter than reported corresponding Ni--B distances [2.18 (1), 2.24 (1) and 2.22(1)A, respectively] in the non-cyclized nickelaborane (Guggenberger, 1972). This further demonstrates that cycloboronation can strengthen the nickel- to-boron bonding (Dou, Hu, Sun et al, 1997;Dou, Hu, Yao et al, 1997;Hu et al, 1997).…”