铁(II),三氟甲磺酸配合物(1的1,2-双(2,2'-联吡啶-6-基)乙烷,与由乙烷桥连接的两个联吡啶结构部分),制备。将30%H 2 O 2水溶液添加到1的乙腈溶液中,得到2,一种绿色化合物,λmax = 710 nm。Moessbauer在2上的测量结果显示出一个双峰,其异构体位移(δ)为0.35 mm / s,四极分裂(ΔE Q)为0.86 mm / s,表明存在反铁磁耦合的二铁配合物。共振拉曼光谱显示出在883、556和451 cm -1处的峰,当到达时,该峰向下移动到832、540和441 cm -1。1用H 2 18 O 2处理。所有光谱数据都支持(μ-羟基)(μ-1,-过氧)二铁(III)配合物的初步形成,该配合物会氧化碳氢键。在0°C 2与环己烯反应生成烯丙基氧化产物,但不生成环氧化物。烷基芳烃的弱苄基CH键也被氧化。二阶速率常数对数与裂解的CH键的键解离能的对数图显示了极好的线性相关性。观察到探针底物2
铁(II),三氟甲磺酸配合物(1的1,2-双(2,2'-联吡啶-6-基)乙烷,与由乙烷桥连接的两个联吡啶结构部分),制备。将30%H 2 O 2水溶液添加到1的乙腈溶液中,得到2,一种绿色化合物,λmax = 710 nm。Moessbauer在2上的测量结果显示出一个双峰,其异构体位移(δ)为0.35 mm / s,四极分裂(ΔE Q)为0.86 mm / s,表明存在反铁磁耦合的二铁配合物。共振拉曼光谱显示出在883、556和451 cm -1处的峰,当到达时,该峰向下移动到832、540和441 cm -1。1用H 2 18 O 2处理。所有光谱数据都支持(μ-羟基)(μ-1,-过氧)二铁(III)配合物的初步形成,该配合物会氧化碳氢键。在0°C 2与环己烯反应生成烯丙基氧化产物,但不生成环氧化物。烷基芳烃的弱苄基CH键也被氧化。二阶速率常数对数与裂解的CH键的键解离能的对数图显示了极好的线性相关性。观察到探针底物2
Structural diversity in manganese, iron and cobalt complexes of the ditopic 1,2-bis(2,2′-bipyridyl-6-yl)ethyne ligand and observation of epoxidation and catalase activity of manganese compounds
作者:Vedichi Madhu、Balaraman Ekambaram、Linda J. W. Shimon、Yael Diskin、Gregory Leitus、Ronny Neumann
DOI:10.1039/b925129d
日期:——
2′-bipyridyl-6-yl)ethyne ligand, L, has been synthesized for the first time by consecutive Suzuki and Sonogashiracouplingreactions either in a one- or two-step synthesis. Coordination of L with some first-row transition metals, Fe, Mn and Co showed a very rich structural diversity that can be obtained with this ligand. Reaction of L with MnII(OAc)2 yielded a dimanganese(II) complex, [Mn2L(μ-OAc)3]PF6
Photocatalytic Splitting of CS<sub>2</sub> to S<sub>8</sub> and a Carbon–Sulfur Polymer Catalyzed by a Bimetallic Ruthenium(II) Compound with a Tertiary Amine Binding Site: Toward Photocatalytic Splitting of CO<sub>2</sub>?
作者:Konstantin Livanov、Vedichi Madhu、Ekambaram Balaraman、Linda J. W. Shimon、Yael Diskin-Posner、Ronny Neumann
DOI:10.1021/ic2008045
日期:2011.11.21
The catalytic photocleavage of CS2 to S-8 and a (CxSy)(n) polymer with visible light using a dinuclear ruthenium(II) compound with a bipyridine units for photoactivity and a vicinal tertiary amine binding site for CS2 activation was studied. The catalyst was characterized by X-ray diffraction, H-1 NMR, and C-13 NMR, ESI-MS and elemental analysis. CS2 photocleavage was significant (240 turnovers, 20 h) to yield isolable S-8 and a (CxSy)(n) polymer. A mononuclear catalyst or one without an amine binding site showed significantly less activity. XPS of the (CxSy)(n) polymer showed a carbon/sulfur ratio similar to 1.5-1.6 indicating that in part both C-S bonds of CS2 had been cleaved. Catalyst was also included within the polymer. The absence of peaks in the H-1 NMR verified the (CxSy)(n) nature of the polymer, while C-13 NMR and IR indicated that the polymer had multiple types of C-S and C-C bonds.
Hydrogen-Atom Transfer Oxidation with H<sub>2</sub>
O<sub>2</sub>
Catalyzed by [FeII(1,2-bis(2,2′-bipyridyl-6-yl)ethane(H<sub>2</sub>
O)<sub>2</sub>
]<sup>2+</sup>
: Likely Involvement of a (μ-Hydroxo)(μ-1,2-peroxo)diiron(III) Intermediate
作者:Alexander M. Khenkin、Madhu Vedichi、Linda J. W. Shimon、Matthew A. Cranswick、Johannes E. M. N. Klein、Lawrence Que、Ronny Neumann
DOI:10.1002/ijch.201700059
日期:2017.11
products but not epoxide. Weak benzylic C−H bonds of alkylarenes were also oxidized. A plot of the logarithms of the second order rate constants versus the bonddissociation energies of the cleaved C−H bond showed an excellent linear correlation. Along with the observation that oxidation of the probe substrate 2,2‐dimethyl‐1‐phenylpropan‐1‐ol yielded the corresponding ketone but no benzaldehyde, and the
铁(II),三氟甲磺酸配合物(1的1,2-双(2,2'-联吡啶-6-基)乙烷,与由乙烷桥连接的两个联吡啶结构部分),制备。将30%H 2 O 2水溶液添加到1的乙腈溶液中,得到2,一种绿色化合物,λmax = 710 nm。Moessbauer在2上的测量结果显示出一个双峰,其异构体位移(δ)为0.35 mm / s,四极分裂(ΔE Q)为0.86 mm / s,表明存在反铁磁耦合的二铁配合物。共振拉曼光谱显示出在883、556和451 cm -1处的峰,当到达时,该峰向下移动到832、540和441 cm -1。1用H 2 18 O 2处理。所有光谱数据都支持(μ-羟基)(μ-1,-过氧)二铁(III)配合物的初步形成,该配合物会氧化碳氢键。在0°C 2与环己烯反应生成烯丙基氧化产物,但不生成环氧化物。烷基芳烃的弱苄基CH键也被氧化。二阶速率常数对数与裂解的CH键的键解离能的对数图显示了极好的线性相关性。观察到探针底物2