Mn(Ⅱ)对壳聚糖降解制备低聚壳聚糖的影响

将壳聚糖进行液态均相配合反应制得壳聚糖锰配合物，IR、元素分析及热分析等检测证实了壳聚糖锰配合物中配位键的存在，且显示壳聚糖锰配合物存在有利于壳聚糖高分子链断裂的弱势结构。以H2O2对壳聚糖．Mn(Ⅱ)配合物及壳聚糖进行氧化降解，考察降解过程中粘度的变化及降解产物分子量分布，在相同的降解条件下，壳聚糖锰配合物的降解速度明显高于壳聚糖，且降解产物分子量分布较壳聚糖直接降解窄。对壳聚糖锰配合物降解反应动力学研究表明壳聚糖锰配合物对H2O2分解不存在催化作用，其降解反应与壳聚糖的差异只与其结构有关。对降解产物进行脱金属处理，所得低聚壳聚糖含锰量为0。     

壳聚糖锰配合物对尿素的吸附性能研究

研究了壳聚糖锰配合物对尿素的吸附,探讨了反应时间、反应温度、酸度和反应物的起始浓度等对吸附的影响,获得了壳聚糖锰配合物对尿素吸附的最佳条件,研究发现壳聚糖锰配合物对尿素具有很好的吸附能力.     

[Mn（IMI）6]（ClO4）2的合成、晶体结构及感度

利用咪唑的水溶液和高氯酸锰水溶液反应制备高氯酸六咪唑合锰(II),培养出该配合物的单晶.用元素分析、红外光谱、DSC、TG-DTG和X射线单晶衍射等方法对该化合物进行了表征.结果表明,该晶体属于单斜晶系,空间群为P2(1)/n,晶胞参数a=11.721(2) nm, b=7.2191(13) nm, c=16.402(3) nm, β=90.064(3)°,V=1387.9(4) nm~3; Dc=1.585 g/cm~3; Z=2;F(000)=678, μ=0.160 mm, R_1=0.036 7, ωR2_=0.137 2.该化合物的分子式为[Mn(IMI)_6](ClO_4) _2,是由6个咪唑分子直接与二价锰离子配位、与高氯酸根离子结合形成的配合物.热分析结果表明,在10 K/min的升温速率下,该配合物的热分解过程由1个吸热峰和1个放热峰组成,剩余残渣量在9.9%左右.感度测试结果表明,该配合物为不敏感型的含能配合物.     

微量元素锰和镍缩二脲配合物的合成、表征与热分解

以硫酸镍或硫酸锰及缩二脲为原料,在甲醇溶液中合成了镍和锰的缩二脲配合物[Ni(bi)2]SO4和[Mn(bi)2]SO4,用滴定分析、元素分析、红外光谱和X射线粉末衍射对产物进行了表征,并研究了配合物的热分解过程。结果表明,镍和锰离子都与缩二脲中的羰基氧原子配位。镍配合物的热分解过程包含缩二脲和金属盐的氧化分解,残余物为氧化镍;而锰配合物的热分解过程仅为缩二脲的分解,残余物为硫酸锰。     

氢键配合物[Mn(H_2O)_2(HNic)_2]晶体的合成及结构表征

用3d金属离子锰与2-羟基-3-吡啶羧酸配体合成出新的水杨酸式螯合具有三维网络结构的Mn(H_2O)_2(HNic)_2配合物。均三苯甲酸苯环上一、三、五位置上的羧基都有脱质子化进行各种不同的结合,利用这点水溶液合成氢键配合物Mn(H_2O)_2(HNic)。我们采用常规分析方法即元素分析谱等,对配合物进行了表征.利用X-射线衍射晶体结构分析,结果显示该配合物属于单斜晶系,空间群为P2(1)/c,每一各晶胞包含两个Mn(H_2O)_2(HNic)_2分子,一个2-羟基-3-吡啶羧酸分子,通过N原子质子化的H原子与临近2-羟基-3-吡啶羧酸分子上的羟基上O原子又形成了一个八元环的氢键结构,该配合物具有复杂的氢键结构。     

锰H2O2酶催化机理研究进展

综述了近年来含锰H2O2酶模拟物的研究进展,主要讨论各种模拟物的催化机理,并总结出高活性的锰H2O2酶模拟物应具有的结构特点.     

一个锰配合物[Mn(L)_2(1,4-NDC)_2]·3H_2O的合成、晶体结构和表征

水热条件下,合成了一个新的锰(Ⅱ)配合物[Mn(L)_2(1,4-NDC)_2]·3H_2O(L=3-硝基-4-(-1H-咪唑[4,5-f][1,10]邻菲罗啉)基苯酚,1,4-H2NDC=1,4-萘二甲酸),并对该配合物进行了元素分析和单晶X-射线衍射表征。该化合物属于单斜晶系,空间群C 2/c,晶胞参数a=19.357(4),b=10.810(2),c=25.753(5)?,β=96.01(3)°,V=5359.2(19)?~3,Z=4,C62H40MnN10O17,Mr=1251.98,Dc=1.552 g/cm~3,F(000)=2572,μ(Mo Ka)=0.366 mm-1,R=0.0566和w R=0.1540。配合物1中,锰(Ⅱ)离子与来自2个L配体分子上的4个N原子配和2个来自2个1,4-萘二甲酸上的O原子,形成6配位的八面体配位几何构型。     

4A和5A族金属元素取代的钨锰杂多配合物的制备与结构表征

通过直接法制备了4A和5A族金属元素取代的以锰为中心原子的杂多配合物,经ICP、TG曲线确定其化学式为K13,14[M(MnW11O39)2].XH2O(M=Sn2 、Pb2 、Sb3 、Bi3 ),采用IR、XRD1、83WNMR等手段对配合物结构进行了表征,表明配合物仍然具有Keggin骨架结构;同时对配合物的热稳定性进行了讨论,4A和5A族金属元素的引入使配合物的热稳定性发生了较大变化,结果表明配合物在500℃以前是稳定的,较1∶12 Keggin结构配合物的热稳定性有较大提高。     

对二茂铁基苯甲醛双缩乙二胺席夫碱及其过渡金属配合物的合成与表征

在无水乙醇中合成了乙二胺双缩对二茂铁基苯甲醛席夫碱FC CH=NCH2CH2N=cH FC(L)及其与二价过渡金属(M)锰、铁、钴、镍、铜、锌、镉、汞的配合物。通过元素分析、红外光谱、核磁共振氢谱及摩尔电导率的测定对配体和配合物进行了表征,配合物的组成为MLCl2。     

二羟基苯二磺酸锰配合物的合成、晶体结构及热稳定性

在水溶剂中,采用回流法合成了两个二羟基苯二磺酸单核Mn(Ⅱ)含氮配体配合物Na[Mn(3,5-(SO3)2HCat)(phen)2H2O](1)和[Mn(3,5-(SO3)2H2Cat)(phen)2H2O]·H2O(2)(H2Cat=1,2-二羟基苯,phen=1,10-邻菲罗啉)。采用X射线单晶衍射、红外光谱、元素分析、紫外可见光谱和热重分析等方法对配合物进行了表征。X射线单晶衍射表征结果表明:两个配合物晶体均属于单斜晶系,晶族分别为P2(1)/c和P2(1)/n。两个配合物的配位方式相似,锰离子均与两个1,10-邻菲罗啉、一个水分子以及磺酸基配位。锰离子是六配位的。     

咔咯锰、铁和钴配合物的合成与应用研究进展

金属咔咯是具有独特的光化学、光物理、光生物性质的多功能卟啉类配合物。特别是一些含有过渡金属如锰、铁、钴为中心离子的金属咔咯配合物,在新型催化剂、抗肿瘤药物、电化学传感器以及纳米材料等领域都具有较好的应用前景。对含有锰、铁、钴中心金属离子的单核和双核咔咯配合物的合成方法及在相关领域的应用进展进行了综述,为该类配合物的进一步研究和应用提供有益参考。     

Disulfido metal carbonyl complexes containing manganese

An account of recent studies of the chemistry of new disulfido metal carbonyl complexes containing manganese is presented. The coordination of the disulfido ligands, the nature of reactions at the manganese atom(s) and the nature of insertion reactions at the disulfido ligands are discussed.     

Oxidation of cycloalkanes with molecular oxygen in the presence of salen metallocomplexes in thermomorphic conditions

The oxidation of cycloalkanes with molecular oxygen, catalyzed by two groups of metallosalen complexes, was studied. The first group consisted of salen complexes with different metals such as Mn, Fe, Co, Ni, Cu, Zn, while the second group was composed of manganese salen complexes with different substituents (t-butyl electron-donating substituents and/or electron-withdrawing perfluoroalkyl substituents). Mn, Fe and Co salen complexes are the most active catalysts, while Ni, Cu and Zn salen complexes are far less efficient. The introduction of t-butyl electron-donating substituents into Mnsalen complex increases the catalytic activity and catalysts solubility in the reaction mixture. The introduction of perfluoroalkyl electron-withdrawing substituents enhances the catalytic activity and renders the solubility of the catalyst temperature dependent (thermomorphic behaviour), thus allowing one to recover them easily after the reaction by simply cooling the system to room temperature. The synthesis of two new manganese salen complexes with perfluoroalkyl substituents was elaborated.     

The Redox Chemistry of Manganese(III) and -(IV) Complexes

The oxidation-reduction thermodynamics for the manganese(III), -(IV), and -(II) ions, and their various complexes, are reviewed for both aqueous and aprotic media. In aqueous solutions the reduction potential for the manganese(III)/(II) couple has values that range from +1.51 V vs. NHE (hydrate at pH 0) to −0.95 V (glucarate complex at pH 13.5). The Mn(IV)/(III) couple has values that range from +1.0 V (solid Mn^IVO₃ at pH 0) to −0.04 V (tris gluconate complex at pH 13.5). With anhydrous media the propensity for the Mn(III) ion to disproportionate to solid Mn^IVO₂ and Mn(II) ion is avoided. For aprotic systems the range of redox potentials for various manganese complexes is from +2.01 V and +1.30 for the Mn(IV)/(III) and Mn(III)/(II) couples (bis terpyridyl tri-N-oxide complex in MeCN), respectively, to −0.96 V for the Mn(IV)/(III) couple (tris 3,5,-di-tert-butylcatecholate complex in Me₂SO). The redox reactions between manganese complexes and dioxygen species (O₂, O₂, and H₂O₂) also are reviewed.     

Synthesis,structure and catalase mimics of novel homoleptic manganese(II) complexes of 1,3-bis(2′-pyridylimino)isoindoline,Mn(4R-ind)2 (R = H,Me)

The preparation of two homoleptic manganese(II) complexes [Mn(4′R-ind)₂] [ind is the anion of 1,3-bis(2-pyridylimino)isoindoline, R = H (1), Me (2)] is described. Both complexes have been structurally characterized by UV–Vis and IR spectroscopies. Crystallographic characterization of the [Mn(ind)₂] (1) complex has shown that the overall geometry around the six-coordinate manganese(II) ion is described as a slightly distorted octahedron in an N₆ donor set. These complexes represent functional model systems for manganese catalases.     

Unprecedented preparation of bis-Schiff bases and their manganese(III) complexes with urease inhibitory activity

Two new thiocyanato-coordinated manganese(III) complexes with bis-Schiff bases have been unprecedented prepared from N-ethylethane-1,2-diamine and N-(2-hydroxyethyl)ethane-1,2-diamine as the starting materials with equimolar quantities of 4-methoxysalicylaldehyde and 3-ethoxysalicylaldehyde, respectively. It was found that the reaction can process only in the presence of manganese salts and ammonium thiocyanate. The urease inhibitory activity of the complexes was tested.     

Silica Gel Anchored Chiral Mn(III)Salen Complexes for Enantioselective Epoxidation of Unfunctionalised Olefins

Heterogeneous Mn(III) chiral salen complexes are prepared through covalent attachment of salen ligand on silica gel via chloropropyl spacer and subsequent complexation with manganese. The complexes are well characterized by IR, UV/VIS, TGA and elemental analysis. Epoxidation of unfunctionalised prochiral olefins by Mn(III) chiral salen complexes using iodosobenzene and m-CPBA as the terminal oxidants and NMO as a co-oxidant was achieved with good yields albeit low enantiomeric excess.     

Trends in the chemistry of mono- to multimetal π-arene complexes of chromium and manganese

The preparation and the features of the ring activation in π-arene metal (chromium, manganese) complexes are discussed. The bottom-up approach to the synthesis of σ, π-bi- and multimetal complexes, and the synthesis of cyclometallated and multicyclic complexes from a variety of selected routes are also reviewed. The stereochemical features of such complexes, and their applications in carbon–carbon coupling reactions and metal insertion reactions are highlighted. The redox reactivities and selected applications of (multi)metal π-arene complexes in catalysis and organic synthesis are included. Finally, the extension of the multimetal π-arene complexes to larger assemblies is shown. The importance of arene ring substituents in the basic mononuclear units and their use as bidentate metalloligands, with bidentate amines as linkers, in the construction of polymers, metal organic frameworks, networks (also on nanoparticles or silica supports), is highlighted.     

Electrochemical and electrocatalytic properties of α-substituted manganese and titanium phthalocyanines

This work reports on the synthesis of manganese and titanium phthalocyanine complexes that are tetra-substituted at four non-peripheral positions with amino ligands. The complexes are investigated for the first time for their electrochemical properties using cyclic voltammetry, rotating disc electrode voltammetry and spectroelectrochemistry. Electropolymerisation on a glassy carbon electrode was performed with ease and the modified electrodes were investigated for electrocatalysis of nitrite oxidation. Nitrite oxidation to nitrate is confirmed from the transfer of a total of two electrons.     

Nematicidal, Fungicidal and Bactericidal Activities of Manganese (II) Complexes with Heterocyclic Sulphonamide Imines

Some manganese(II) complexes derived from different sulphadrugs and heterocyclic ketones have been prepared. These complexes have been characterized on the basis of elemental analyses, molecular weight determinations, conductivity measurements, infrared, ESR and magnetic measurements. The spectral data suggest that the ligands act in a monobasic, bidentate manner coordinating through nitrogen atom. A high spin tetrahedral geometry around this metal has been proposed on the basis of magnetic and spectral studies. The isolated products are coloured solids, soluble in DMSO, DMF and MeOH. All the complexes are monomeric in nature as indicated by their molecular weight determinations and conductivity measurements in dry DMF show them to be non-electrolytes. All the ligands and their corresponding complexes have been screened for their fungicidal, bactericidal and nematicidal activities.