[PPh 4 ][Cu(η 4 -4)]•2H 2 O (avec H 4 4=bis(hydroxy-2methylpropanamido-2)-1,2 benzo) 结晶 dans le groupe d'espace P2 1 /n。Affinement de la 结构 jusqu'a 0,061。Le center metallique se trouve dans unenvironmental plan-carre avec des longueurs de liaison et desangles normaux pour la formula Cu(III)
[PPh 4 ][Cu(η 4 -4)]•2H 2 O (avec H 4 4=bis(hydroxy-2methylpropanamido-2)-1,2 benzo) 结晶 dans le groupe d'espace P2 1 /n。Affinement de la 结构 jusqu'a 0,061。Le center metallique se trouve dans unenvironmental plan-carre avec des longueurs de liaison et desangles normaux pour la formula Cu(III)
(overpotential of 560 mV). The findings show that the ligand-based oxidation reactions strongly depend upon the ligand’s electronic substitution; however, such effects on the copper-centered redox couple and catalytic WO are minimal. The energetically favorable mechanism has been established through the theoretical calculation of stepwise reaction energies, which nicely explains the experimentally observed electron
由 N 2 O 2供体连接的两个分子铜 (II) 配合物 (NMe 4 ) 2 [Cu II (L 1 )] ( 1 ) 和 (NMe 4 ) 2 [Cu II (L 2 )] ( 2 )一组配体 [L 1 = N,N '-(1,2-亚苯基)双(2-羟基-2-甲基丙酰胺), L 2 = N,N '-(4,5-二甲基-1,2-亚苯基)双(2-羟基-2-甲基丙酰胺)]已被合成并彻底表征。电化学研究1在 pH 9.2 的碳酸盐缓冲液中显示出 0.51 V 的可逆铜中心氧化还原对,随后在 1.02 和 1.25 V 发生两个基于配体的氧化事件,以及在 1.28 V 的起始电位(580 mV 的过电位)下的催化水氧化. 配体的富电子性质可能支持在 CV 时间尺度上获得高价铜物质。理论电子结构研究的结果与观察到的逐步配体中心氧化过程非常一致。用1进行的恒电位电解实验表明,催化电流密度 >2.4 mA cm
Oxidation of m-chlorobenzoic acid by Mn(V)O complexes
作者:Wen-Yuan Hsieh、Vincent L Pecoraro
DOI:10.1016/s0020-1693(02)01203-3
日期:2002.12
chemistry including one containing the oxidation resistant ligand [Mn(V)O(HMPAB)] − (where H 4 HMPAB=1,2-bis(2-hydroxy-2-methylpropanamido)benzene) and [Mn(V)O(salen*)] + (where H2 salen*=[( R , R )-(−)- N , N ′-bis(3,5-di- tert -butylsalicylidene)-1,2-cyclohexanediamine]) which has been a catalyst in Katsuki–Jacobsen chiralepoxidation reaction. We demonstrate that both Mn(V) complexes are unstable in
Effect of Redox-Inactive Metal Ion–Nickel(III) Interactions on the Redox Properties and Proton-Coupled Electron Transfer Reactivity
作者:Simarjeet Kaur、Moumita Bera、Aakash Santra、Sandip Munshi、George E. Sterbinsky、Tianpin Wu、Dooshaye Moonshiram、Sayantan Paria
DOI:10.1021/acs.inorgchem.2c01472
日期:2022.9.12
spectroscopy (XAS), electron paramagnetic resonance (EPR), and reactivity studies. The X-ray structure of Ca2+ coordinated to Ni(III) complexes, 2-Ca2+T, was determined and exhibited an average Ni–Ca distance of 3.1253 Å, close to the metal ions’ covalent radius. XAS analysis of 2-Ca2+ and 2-Y3+ in solution further revealed an additional coordination to Ca and Y in the 2-Mn+ adducts with shortened Ni–M distances
双酰胺酸酯-双醇盐配体的单核镍 (II) 和镍 (III) 配合物,分别为 (NMe 4 ) 2 [Ni II (HMPAB)] ( 1 ) 和 (NMe 4 )[Ni III (HMPAB)] ( 2 ) , 已通过包括 X 射线晶体学在内的各种光谱技术合成和表征。氧化还原惰性金属离子(M n + = Ca 2+、Mg 2+、Zn 2+、Y 3+和 Sc 3+)与2反应生成2 -M n +加合物,通过一系列光谱技术评估,包括 X 射线吸收光谱 (XAS)、电子顺磁共振 (EPR) 和反应性研究。确定了与 Ni(III) 配合物2 -Ca 2+ T 配位的 Ca 2+的 X 射线结构,显示出平均 Ni-Ca 距离为 3.1253 Å,接近金属离子的共价半径。溶液中2 -Ca 2+和2 -Y 3+的XAS 分析进一步揭示了2 -M n +中 Ca 和 Y 的额外配位加合物的 Ni-M 距离缩短分别为
Characterization of Reaction Intermediates Involved in the Water Oxidation Reaction of a Molecular Cobalt Complex
Molecular cobalt(III) complexes of bis-amidate-bis-alkoxide ligands, (Me4N)[CoIII(L1)] (1) and (Me4N)[CoIII(L2)] (2), are synthesized and assessed through a range of characterization techniques. Electrocatalytic water oxidation activity of the Co complexes in a 0.1 M phosphate buffer solution revealed a ligand-centered 2e–/1H+ transfer event at 0.99 V followed by catalytic water oxidation (WO) at an
双酰胺-双醇盐配体的分子钴 (III) 配合物,(Me 4 N)[Co III (L 1 )] ( 1 ) 和 (Me 4 N)[Co III (L 2 )] ( 2 ),通过一系列表征技术进行合成和评估。Co 络合物在 0.1 M 磷酸盐缓冲溶液中的电催化水氧化活性表明在 0.99 V 时发生以配体为中心的 2e – /1H +转移事件,随后在 450 mV 的起始过电势下发生催化水氧化 (WO)。相比之下,2揭示了 0.9 V 的基于配体的氧化事件和 430 mV 的 WO 起始过电势。恒电位电解研究和漂洗测试实验证实了 WO 期间 Co 配合物的均匀性。机理研究进一步表明反应途径中的 pH 依赖性变化。一方面,在 pH 7.5 以下,两个连续的基于配体的氧化事件导致 Co III (L 2– )(OH) 物种的形成,随后发生质子耦合电子转移反应,生成 Co IV (L 2– )(O)
Structural and EPR Studies of Vanadium Complexes of Deprotonated Amide Ligands: Effects on the 51V Hyperfine Coupling Constant
作者:Charles R. Cornman、Edward P. Zovinka、Yvette D. Boyajian、Katherine M. Geiser-Bush、Paul D. Boyle、Phirtu Singh
DOI:10.1021/ic00120a029
日期:1995.8
The effect of amide coordination on the parallel coupling constant has been determined for three square pyramidal vanadyl complexes. The complexes (VO)-O-IV(PAAP), (VO)-O-IV(PAIS), and [(VO)-O-V(HIBA)][C4H9)(4)N] have been prepared, and the tatter two have been structurally characterized (PAAP is the dianion of 1,2-bis(2-carboxamidopyridyl)-benzene, PAIS is the dianion of [N-(salicylideneamine)phenyl]pyridine-2-carboxamide], HIBA is the tetraanion of 1,2-bis(2-hydroxy-2-methylpropanamido)benzene). X-ray diffraction quality crystals of (VO)-O-IV(PAIS> were obtained by slow evaporation of a nitromethane solution of (VO)-O-IV(PAIS). X-ray parameters for (VO)-O-IV(PAIS): C19H13N3O3V1, 382.08 g/mol, P2(1)/n, a = 7.777(3) Angstrom, b = 18.433(7) Angstrom, c = 11,565(4) Angstrom, beta = 102.66(3)degrees; V = 1633(1) Angstrom 3; Z = 4. The final. refinement yielded R = 0.0600 and R(w) = 0.0450. X-ray diffraction quality crystals of [(VO)-O-V(HIBA)][(C4H9)(4)N] were obtained by slow evaporation of a THF-CHCl3 solution of [(VO)-O-V(HIBA)-[[(C4H9)4N]. X-ray parameters for [(VO)-O-V(HIBA)][C4H9)(4)N]: C(30)H(52)N(3)0(5)V(1), 585.69 g/mol, P2(1)/n; a 13.228(3) Angstrom, b = 16.054(4) Angstrom, c = 14.7140(20) Angstrom, beta = 93.240(10)degrees; V = 3119.7(11) Angstrom(3); Z = 4. The final refinement yielded R = 0.051 and R(w) = 0.047. Comparison of calculated and experimental values of A(II) for vanadyl-bleomycin and vanadyl-serum albumin support the presence of a deprotonated amide donor(s) in vanadyl-bleomycin but not in vanadyl-serum albumin.