Zinc(II) complexes of tripodal ligands providing phenolate and pyridine donors: formation, structure and hydrolytic activity
作者:Harry Adams、Neil A. Bailey、David E. Fenton、Qing-Yu He
DOI:10.1039/dt9960002857
日期:——
A group of zinc(II) complexes derived from tri- and tetra-dentate proligands bearing pyridyl and phenolic arms have been prepared and characterised. Potentiometric titrations suggested that a stepwise complexation initially to the pendant OH, and then to pendant O– occurred. The crystal structures of [Zn2L32][ClO4]2(L3= 2-bis[2-(2-pyridyl)ethyl]aminomethyl}phenolate) and [Zn2L62][Zn(NCS)4]·0.5H2O
制备并表征了一组衍生自带有吡啶基和酚基臂的三齿和四齿配体的锌(II)配合物。电位滴定建议逐步络合最初挂件OH,然后吊坠Ø -发生。[Zn 2 L 3 2 ] [ClO 4 ] 2(L 3 = 2- 双[2-(2-吡啶基)乙基]氨基甲基}酚盐)和[Zn 2 L 6 2 ] [Zn(NCS )的晶体结构)4 ]·0.5H 2 O(L 6= 2- 双[2-(2-(2-吡啶基)乙基]氨基甲基} -4-硝基苯酚盐)揭示两个络合物均为固态的二聚体。最好将锌(II)周围的配位几何形状描述为扭曲的方形锥体,其中一个吡啶基氮原子,一个叔氮原子和两个酚氧基原子形成基面,并且一个吡啶基氮原子在轴向位置。锌之间的间距分别为3.284Å和3.274Å。[Zn L 7 2 ](L 7 = 4-硝基-2-[2-(2-吡啶基)乙基]氨基甲基}酚盐的晶体结构显示对称角上带有锌原子的八面体络合物。配合物[Zn 2 L 3
Push-pull ligands and the oxidation of monomethylplatinum(II) complexes with oxygen or hydrogen peroxide
作者:Anwar Abo-Amer、Paul D. Boyle、Richard J. Puddephatt
DOI:10.1016/j.ica.2020.119580
日期:2020.7
– L3, the complexes react rapidly with hydrogen peroxide and slowly with dioxygen from air to give the corresponding platinum(IV) complexes [Pt(OH)Me(κ4-N,N’,N”,O-L-H)]Cl, in which the deprotonated phenol group is coordinated trans to the hydroxo ligand. The structures of three of these complexes are determined and all are shown to self-assemble with water molecules to form hydrogen-bonded supramolecular
An unusual axial co-ordination of phenolate oxygen to copper(II): crystal structure of chloro{2-[bis(2-pyridylmethyl)aminomethyl]-4-nitrophenolato}copper(II)
A tripod ligand possessing two pyridine moieties and a phenolato group as pendants forms a mononuclear complex with an axial copper(II)–phenolate co-ordination in a square-pyramidal environment.
Mononuclear copper(II) complexes of tri- and tetra-dentate tripodal ligands containing phenolic hydroxyl and benzimidazole or pyridine groups have been isolated. They are of the type [CuL(X)]·nH2O, [CuL(H2O)]X·nH2O or [CuL]·nH2O where X = Cl–, ClO4–, N3– or NCS– and n= 0–4. The electronicspectra of all the complexes exhibit a broad absorption band around 14 000 cm–1 and the polycrystalline as well
已分离出包含酚羟基和苯并咪唑或吡啶基的三齿和四齿三脚架配体的单核铜(II)配合物。它们的类型为[CuL(X)]· n H 2 O,[CuL(H 2 O)] X· n H 2 O或[CuL]· n H 2 O,其中X = Cl –,ClO 4 –, N 3 –或NCS –且n = 0–4。所有配合物的电子光谱在14000 cm –1附近均显示出较宽的吸收带多晶以及冷冻溶液的EPR光谱是轴向的,表明基于正方形的几何形状。[CuL(Cl)] [HL =(2-羟基-5-硝基苄基)双(2-吡啶基甲基)胺]的晶体结构在Cu II附近显示出正方形的金字塔形几何形状。在三斜晶系空间群的单核络合物结晶P与一个= 6.938(1),b = 11.782(6),C ^ = 12.678(3)a和α= 114.56(3),β= 92.70(2),γ= 95.36 (2)°。配位平面由一个叔胺和两个吡啶氮和一个氯离
Interaction between peroxide ion and phenol group which are coordinated to the same iron(III) ion
Fe(5-NO2-phpy)Cl2, and Fe(Me-enph)ClPF6, which are of a mononuclear six-coordinate iron(III) complex with coordination of one or two chloride ion(s). These compounds are highly colored (dark violet) due to the coordination of phenol group to an iron(III) atom. When hydrogen peroxide was added to the solution of the iron(III) complex, a color change occurs with bleaching of the violet color, indicating
我们已经制备了几种带有配位基团的新的铁(III)配合物,这些配位基含有一个酚基。它们是四齿配体[(X-phpy)H,X和H(phpy)分别代表苯酚环和N,N-双(2-吡啶基甲基)-N-(2-羟基苄基)胺上的取代基]和五齿配体[(R-enph-X)H; R =乙基(Et)或甲基(Me)衍生物,并且H(Me-enph)表示N,N-双(2-吡啶基甲基)-N ″-甲基-N ″-(2″-羟基-苄基胺)乙二胺]和已经确定了Fe(phpy)Cl 2,Fe(5-NO 2 -phpy)Cl 2和Fe(Me-enph)ClPF 6的晶体结构,是具有一个或两个氯离子配位的单核六配位铁(III)配合物。由于酚基团与铁(III)原子的配位,这些化合物呈高度着色(深紫色)。当将过氧化氢添加到铁(III)配合物的溶液中时,颜色发生变化并伴随着紫色的褪色,这表明在配体系统中发生了酚部分的氧化降解。通过添加t也可以观察到紫