Anion control of tautomeric equilibria: Fe–H <i>vs.</i> N–H influenced by NH⋯F hydrogen bonding
作者:Geoffrey M. Chambers、Samantha I. Johnson、Simone Raugei、R. Morris Bullock
DOI:10.1039/c8sc04239j
日期:——
Counterions can play an active role in chemical reactivity, modulating reaction pathways, energetics and selectivity. We investigated the tautomeric equilibrium resulting from protonation of Fe(PEtNMePEt)(CO)3 (PEtNMePEt = (Et2PCH2)2NMe) at Fe or N. Protonation of Fe(PEtNMePEt)(CO)3 by [(Et2O)2H]+[B(C6F5)4]− occurs at the metal to give the iron hydride [Fe(PEtNMePEt)(CO)3H]+[B(C6F5)4]−. In contrast
抗衡离子可以在化学反应性、调节反应途径、能量学和选择性方面发挥积极作用。我们研究了 Fe(P Et N Me P Et )(CO) 3 (P Et N Me P Et = (Et 2 PCH 2 ) 2 NMe) 在 Fe 或 N 处质子化产生的互变异构平衡。 Fe(P Et的质子化N Me P Et )(CO) 3通过 [(Et 2 O) 2 H] + [B(C 6 F 5 ) 4 ] -在金属处发生,得到氢化铁 [Fe(P Et N Me P Et ) (CO) 3 H] + [B(C 6 F 5 ) 4 ] - 。相反,用HBF 4 ·OEt 2处理在铁和侧胺处产生质子化。 FeH 和 NH 互变异构体均通过单晶 X 射线衍射进行了表征。 由于 NH⋯F 氢键作用,向平衡混合物中添加过量的 BF 4 -导致仅观察到 NH 互变异构体。对这些系统的键合特性的量子化学分析提供了NH与BF
Studies of Structural Effects on the Half-Wave Potentials of Mononuclear and Dinuclear Nickel(II) Diphosphine/Dithiolate Complexes
作者:Kendra Redin、Aaron D. Wilson、Rachel Newell、M. Rakowski DuBois、Daniel L. DuBois
DOI:10.1021/ic061740x
日期:2007.2.19
mononuclear Ni(II) complexes of the formula (PNP)Ni(dithiolate) where PNP = R2PCH2N(CH3)CH2PR2, R = Et and Ph, have been synthesized containing dithiolate ligands that vary from five- to seven-membered chelate rings. Two series of dinuclear Ni(II) complexes of the formula [(diphosphine)Ni]2(dithiolate)}(X)2 (X = BF4 or PF6) have been synthesized in which the chelate ring size of the dithiolate and diphosphine
The steps of activating a prospective CO<sub>2</sub> hydrogenation catalyst with combined CO<sub>2</sub> capture and reduction
作者:D. B. Lao、B. R. Galan、J. C. Linehan、D. J. Heldebrant
DOI:10.1039/c6gc01800a
日期:——
Combining carbon capture and reduction is an efficient strategy to alleviate the high energy requirements for processing CO2 prior to reduction.
将碳捕集和还原结合起来是一种有效的策略,可以减轻在还原之前处理CO2所需的高能量要求。
Protonation of Ferrous Dinitrogen Complexes Containing a Diphosphine Ligand with a Pendent Amine
作者:Zachariah M. Heiden、Shentan Chen、Michael T. Mock、William G. Dougherty、W. Scott Kassel、Roger Rousseau、R. Morris Bullock
DOI:10.1021/ic4000704
日期:2013.4.1
ligand. The chemical reduction of these ferrous dinitrogen complexes was performed in an attempt to increase the basicity of the N2 ligand enough to promote proton transfer from the pendent amine to the N2 ligand. Instead of isolating a reduced Fe(0)–N2 complex, the reduction resulted in isolation and characterization of HFe(Et2PC(H)N(Me)CH2PEt2)(PEtNMePEt), the product of oxidative addition of the methylene
在亚铁二氮配合物中添加酸[FeX(N 2)(P Et N Me P Et)(dmpm)] +(X = H,Cl或Br; P Et N Me P Et = Et 2 PCH 2 N(我)CH 2 PET 2 ;和DMPM =我2 PCH 2 PME 2)在二膦配体,而不是在一氧化二配体的侧胺给出质子化。此质子化增加了ν N2 25厘米络合物的带-1并将Fe(II / I)耦合移至0.33 V,以产生更高的正电势。对于相关的羰基配合物[FeH(CO)(P Et N Me P Et)(dmpm)] +,观察到了相似的IR位移和Fe(II / I)对(0.23 V)的位移。发现[FeH(P Et N Me P Et)(dmpm)] +结合N 2的强度约为NH 3的三倍。计算分析表明,N 2与Fe(II)中心的配位将N 2(vs游离N 2)的碱度提高了13和20 p K a反式卤化物和氢化物的单位。
Synthesis and reactivity of molybdenum and tungsten bis(dinitrogen) complexes supported by diphosphine chelates containing pendant amines
作者:Charles J. Weiss、Amy N. Groves、Michael T. Mock、William G. Dougherty、W. Scott Kassel、Monte L. Helm、Daniel L. DuBois、R. Morris Bullock
DOI:10.1039/c2dt12224c
日期:——
Molybdenum and tungstenbis(dinitrogen) complexes of the formula M(N2)2(PNP)2 (M = Mo and W) and W(N2)2(dppe)(PNP), supported by diphosphine ligands containing a pendant amine of the formula (CH2PR2)2NR′ = PRNR′PR (R = Et, Ph; R′ = Me, Bn), have been prepared by Mg reduction of metal halides under an N2 atmosphere. The complexes have been characterized by NMR and IR spectroscopy, X-ray crystallography
分子式为M(N 2)2(PNP)2(M = Mo和W)和W(N 2)2(dppe)(PNP)的钼和钨双(二氮)配合物,由含侧基胺的二膦配体负载式(CH 2 PR 2)2 NR'= P [R ñ R' P [R(R =的Et中,Ph; R'= Me中,Bn),对已根据一个N制备由镁还原的金属卤化物2大气层。该复合物已通过NMR和IR光谱,X射线晶体学和循环伏安法表征。目标Mo和W双(二氮)化合物与CO的反应性导致形成二羰基配合物。