含三齿苯并恶唑 氨基苯酚合成了配体HL BAP并与Cu II配合。通过X射线,红外,紫外-近红外光谱和磁化率研究对所得的Cu II配合物进行表征,证明该配体在分离的配合物中被氧化为邻亚氨基半醌形式[L BIS ] -。L BIS Cu II Cl具有扭曲的四面体几何形状,而L BIS Cu II OAc是方形锥体。在这两种固态结构中,配体均通过苯并恶唑与Cu II配位,并与邻位的氮和氧原子配位。-亚氨基半醌部分。氯化物或乙酸盐基团分别在L BIS Cu II Cl和L BIS Cu II OAc中占据第四和/或第五位置。磁化率测量结果表明,由于d 9 Cu II中心与亚氨基半醌配体基团之间存在反铁磁耦合,因此两种络合物都是抗磁性的。配合物的电化学研究表明,铜配合物具有准可逆的还原和氧化过程。虽然L BIS Cu II X(X = Cl)是EPR沉默的,但化学氧化可提供具有与配体氧化一致的EPR信号的物质,从而形成ad
We report a new mononuclear molybdenum(IV) complex, MoOLBISLSQ, in which LSQ (2,4-di-tert-butyl o-semibenzoquinone ligand) has been prepared from the reaction of the o-iminosemibenzoquinone form of a tridentate non-innocent benzoxazole ligand, LBIS, and MoO2(acac)2. The complex was characterized by X-ray crystallography, elemental analysis, IR and UV-vis spectroscopy and magnetic susceptibility measurements
我们报道了一种新的单核钼( IV )配合物MoOL BIS L SQ ,其中L SQ (2,4-二叔丁基邻半苯醌配体)是通过三齿的邻亚氨基半苯醌形式的反应制备的非无害苯并恶唑配体、 L BIS和MoO 2 (acac) 2 。通过 X 射线晶体学、元素分析、红外和紫外-可见光谱以及磁化率测量对该复合物进行了表征。 MoOL BIS L SQ的晶体结构显示出围绕金属中心的扭曲八面体几何形状,周围环绕着L BIS的一个 O 原子和两个 N 原子以及L SQ的两个 O 原子。 MoOL BIS L SQ的有效磁矩( μ eff )在290至2 K的温度范围内从2.36降至0.2 μB ,表明金属与配体中心不成对电子之间的反铁磁耦合引起的单重态基态。此外,后者导致了该复合体的 EPR 沉默。循环伏安法(CV)研究表明配体和金属中心的氧化还原过程。 MoOL BIS L SQ用作环己烯氧化裂解为己二
Biradical <i>o</i>-iminobenzosemiquinonato(1−) complexes of nickel(<scp>ii</scp>): catalytic activity in three-component coupling of aldehydes, amines and alkynes
and alkynes (A3-coupling) was studied in the presence of the NiL2BIS complex, and the previously reported four-coordinated bis-o-iminosemiquinone NiL2NIS. Furthermore, among these two o-iminobenzosemiquinonato(1−) complexes of Ni(II) (NiL2NIS and NiL2BIS), NiL2NIS was found to be an efficientcatalyst in A3-coupling at 85 °C under solvent-free conditions and can be recovered and reused for several cycles
合成并表征了六配位双邻亚氨基半醌配合物NiL 2 BIS ,其中L BIS是三齿邻氨基苯酚苯并恶唑基配体H 2 L BAP的邻亚氨基半醌1-电子氧化形式。该配合物的晶体结构显示出具有NiN 4 O 2配位球的八面体几何形状,其中Ni( II )被两个三齿L BIS配体包围。该化合物表现出 ( S Ni = 1) 自旋和轨道对磁矩的贡献以及两个L BIS配体上两个电子之间的反铁磁耦合,从而产生三重态自旋基态 ( S = 1)。基于实验观察和理论计算,本文介绍了这种开壳层分子的电子跃迁和电化学行为。通过循环伏安法研究了NiL 2 BIS的电化学行为,并表明了以配体为中心的氧化还原过程。 在NiL 2 BIS配合物和先前报道的四配位双邻亚氨基半醌NiL 2 NIS存在下研究了醛、胺和炔的三组分偶联(A 3 -偶联)。此外,在Ni( II )的这两种邻亚氨基苯并半醌(1−)络合物( NiL 2 NIS和NiL
Redox potential tuning by redox-inactive anions in copper(II) complexes of non-innocent o-aminophenol-based ligand containing benzoxazole: Learning from nature
[LBIS]− in copper complexes, CuLBISX, (X = Br−, I−, N3−, NO3−). LBISCuIINO3 is square pyramidal complex while the three other complexes show a distorted tetrahedral geometry. In all structures the ligand is coordinated to CuII via the benzoxazole, as well as the nitrogen and oxygen atoms from the o-iminosemiquinone moiety. The monodentate bromide, iodide, azide, and bidentate nitrate groups occupy the fourth
Synthesis, characterization and catalytic activity of copper(ii) complexes containing a redox-active benzoxazole iminosemiquinone ligand
作者:S. Esmael Balaghi、Elham Safaei、Linus Chiang、Edwin W. Y. Wong、Didier Savard、Ryan M. Clarke、Tim Storr
DOI:10.1039/c3dt00004d
日期:——
a quasi-reversible reduction and oxidation process for the Cu complexes. While LBISCuIIX (X = Cl) is EPR-silent, chemical oxidation affords a species with an EPR signal consistent with ligand oxidation to form a d9 CuII iminoquinone species. In addition, chemical reduction results in a CuII centre most likely bound to an amidophenoxide. Mild and efficient oxidation of alcohol substrates to the corresponding
含三齿苯并恶唑 氨基苯酚合成了配体HL BAP并与Cu II配合。通过X射线,红外,紫外-近红外光谱和磁化率研究对所得的Cu II配合物进行表征,证明该配体在分离的配合物中被氧化为邻亚氨基半醌形式[L BIS ] -。L BIS Cu II Cl具有扭曲的四面体几何形状,而L BIS Cu II OAc是方形锥体。在这两种固态结构中,配体均通过苯并恶唑与Cu II配位,并与邻位的氮和氧原子配位。-亚氨基半醌部分。氯化物或乙酸盐基团分别在L BIS Cu II Cl和L BIS Cu II OAc中占据第四和/或第五位置。磁化率测量结果表明,由于d 9 Cu II中心与亚氨基半醌配体基团之间存在反铁磁耦合,因此两种络合物都是抗磁性的。配合物的电化学研究表明,铜配合物具有准可逆的还原和氧化过程。虽然L BIS Cu II X(X = Cl)是EPR沉默的,但化学氧化可提供具有与配体氧化一致的EPR信号的物质,从而形成ad
Oxidation of sulfides including DBT using a new vanadyl complex of a non-innocent <i>o</i>
-aminophenol benzoxazole based ligand
quasi‐reversible metal‐centered reduction and ligand‐centered oxidation of complex. The magnetic moment of VOLBIS (SQ) is consistent with the spin‐only value expected for S = 1/2 system. The neutral species of VOLBIS (SQ) is EPR active, which is consistent with a paramagnetic electronic ground state (S = 1/2). This result is in accordance with the vanadyl (IV) moiety surrounded by tridentate iminobenzosemiquinonate