Structural and spectral characterization of Cu(II) complexes of N(4)-substituted thiosemicarbazones derived from 2-hydroxyacetophenone: Crystal structure of a dinuclear Cu(II) complex
作者:E B Seena、M Sithambaresan、Suni Vasudevan、M R Prathapachandra Kurup
DOI:10.1007/s12039-020-01845-7
日期:2020.12
Abstract The synthesis and characterization of monomeric and dimeric Cu(II) complexes with 2-hydroxyacetophenone-N(4)-cyclohexyl/phenyl substituted ONS donor ligands is described. It also reports the crystalstructure of a novel binuclear Cu(II) complex with oxygenbridging and its interesting coordination. This compound [CuL1]2 is a rare example of copper(II)-thiosemicarbazone complex with oxygen bridging
摘要 合成了2-羟基苯乙酮-N(4)-环己基硫代半碳a(H 2 L 1)和2-羟基苯乙酮-N(4)-苯基硫代半碳zone(H 2 L 2)的铜(II)配合物。研究以及电子,红外和EPR光谱研究。[(CuL 1)2 ](1)是在具有扭曲的正方形平面几何形状的铜(II)周围具有四个配位的双核络合物。两个单独的双核络合物通过两个分叉的经典氢键相互作用相互连接,沿b轴产生片状结构。[(CuL 2)2 ]· 1/ 2 H 2 O(2)也具有二聚体结构。在所有络合物中,除[Cu(HL 1)Cl]·2H 2 O(3),[Cu(HL 1 Br)·4H 2 O(4)外,硫代半咔唑酮均作为阴离子ONS供体配体与金属结合。)和[铜(HL 1)NO 3 ]·C 2 H ^ 5 OH(H 2 O)(5),其中,所述配体部分被协调为单阴离子(HL ¯)的。配合物[CuL 1 dmbipy](6),[CuL 2 dmbipy]·3H2
Nickel(II)–PPh
<sub>3</sub>
Complexes of
<i>S</i>
,
<i>N</i>
‐Substituted Thiosemicarbazones – Structure, DFT Study, and Catalytic Efficiency
reported. The complexes crystallize in the monoclinic space group P21/n, and the nickel centers have a distorted square-planar environment. The coupling reaction of phenylmagnesium bromide with bromobenzene was used to determine the catalytic activities of the nickel(II) complexes prepared, and the results show that the ONN complexes provide higher yields relative to those with ONS donors. The catalytic
五个 2-羟基苯乙酮缩氨基硫脲,带有 [–N4H–R–(SH)](其中 R 是乙基或苯基)和 [–N4H–R–(SR1)](其中 R/R1 表示甲基/甲基、甲基/丙基,或合成了硫代酰胺基团上的取代基(苯基/甲基)。配体具有 ONS 或 ONN 供体组,二元配体与 [Ni(PPh3)2Cl2] 的反应产生具有通式 [Ni(L)(PPh3)] 的螯合物。稳定的固体配合物通过 IR 和 1H NMR 光谱和元素分析表征。报告了两种配合物的晶体结构,一种具有 S-甲基-N4-苯基-,另一种具有 S-丙基-N4-甲基取代的氨基硫脲配体。配合物在单斜空间群 P21/n 中结晶,镍中心具有扭曲的方形平面环境。苯基溴化镁与溴苯的偶联反应用于测定制备的镍(II)配合物的催化活性,结果表明 ONN 配合物比具有 ONS 供体的配合物具有更高的产率。镍配合物的催化效率通过使用密度泛函理论 (DFT) 进行建模。
Synthesis of mono- and binuclear dioxomolybdenum(VI) complexes derived from N(4)-substituted thiosemicarbazones: X-ray crystal structures of [(MoO2L1)2], [MoO2L1py] and [MoO2L2py]
作者:E.B. Seena、M.R. Prathapachandra Kurup
DOI:10.1016/j.poly.2007.03.046
日期:2007.8
complexes, molybdenum is coordinated by two terminal oxo-oxygen atoms, (Ot), oxygen, nitrogen and sulfur atoms from the principal ligand and by an oxygen atom from the second unit in 1, and by a nitrogen atom from pyridine in complexes 2 and 4. All complexes have been spectroscopically characterized. The molecularstructures of complexes 1, 2 and 4 have been determined by the single crystal X-ray diffraction
已经合成和表征了四种钼(VI)硫代半碳氮杂多酸配合物。通过[MoO 2(acac)2 ]与2-羟基苯乙酮N(4 )的反应制备了双核配合物[(MoO 2 L 1)2 ](1)和[(MoO 2 L 2)2 ](3)。)-环己基(H 2 L 1)和N(4)-苯基(H 2 L 2)硫代半脲在酒精介质中。[MoO 2 L 1 py](2)和[MoO ]型单核二氧钼(VI)配合物通过1或3与吡啶(py)在酒精介质中的反应制备了2 L 2 py](4)。在所有配合物中,钼由两个末端氧合氧原子(O t),主配体中的氧,氮和硫原子以及1中第二个单元中的氧原子和吡啶中的氮原子配位在配合物2和4中。所有配合物均已进行了光谱表征。配合物的分子结构1,2和4已经由单晶X射线衍射法测定。
Synthesis and spectral investigations of vanadium(IV/V) complexes derived from an ONS donor thiosemicarbazone ligand
作者:Neema Ani Mangalam、M.R. Prathapachandra Kurup
DOI:10.1016/j.saa.2008.07.043
日期:2009.1
Four oxovanadium and one dioxovanadium complex with 2-hydroxyacetophenone N(4)-phenylthiosemicarbazone (H2L) which are represented as [VOLphen]center dot 2H(2)O (1), [VOLbipy] (2). [VOLdmbipy] (3), [VOL](2) (4) and [VO2HL]center dot CH3OH (5) have been synthesized and characterized by elemental analyses, electronic, infrared and EPR spectral techniques. In all the complexes 1-4 the ligand coordinates through phenolic oxygen, azomethine nitrogen and thiolate sulfur. But in complex [VO2HL]center dot CH3OH. coordination takes place in thione form instead of thiolate sulfur. All the complexes except [VO2HL]center dot CH3OH are EPR active due to the presence of an unpaired electron. In frozen DMF at 77 K, all the oxovanadium(IV) complexes show axial anisotropy with two sets of eight line patterns. (C) 2008 Elsevier B.V. All rights reserved.
Coordination of a Schiff base as an iminium-thiolate zwitterion to rhenium(I)
the formulation [Re(CO)3(H2hpt)2]Cl. One H2hpt ligand is coordinated via the thione sulfur and imino nitrogen atoms, with the other coordinated in a novel manner as a monodentate iminium-thiolate zwitterion. The crystal structures of 1 and H2hpt were determined by X-ray single crystal diffraction. In addition, infra-red, 1H NMR and electronic properties are also reported.