含取代基苯基羧酸与柔性含氮配体构筑的三个过渡配位化合物的合成、晶体结构与物理性质

利用3,5-二硝基苯甲酸（3,5-DNBH）,1,2-双咪唑亚甲苯（1,2-bimb）与3种过渡金属盐通过水热反应成功地构筑3个过渡金属配位化合物,即[M（3,5-DNB）₂（1,2-bimb）]（M=Co（Ⅱ）（1）,Cd（Ⅱ）（3））和[Zn（3,5-DNB）₂（1,2-bimb）]_n（3）。通过红外光谱、元素分析、单晶和粉末X射线衍射表征了这三个化合物。化合物1和3是同构的,含有一个双核单元[M₂（COO）₂],该双核单元由金属离子、3,5-二硝基苯甲酸根以及1,2-bimb分子构成。双核单元再通过O…π弱相互作用形成超分子结构,该弱相互作用是通过3,5-二硝基苯甲酸根上的硝基氧原子与1,2-bimb上的苯环所形成。化合物2是一维链结构,链与链之间再通过3,5-二硝基苯甲酸根和1,2-双咪唑亚甲苯配体上苯环之间的π…π相互作用,形成了一个超分子结构。室温条件下研究了化合物2和3分散在甲醇中的荧光性质。热重测试结果显示3个化合物具有相对较高的热稳定性。可见光照射条件下化合物1对罗丹明B具有一定的催化降解能力。此外,直流磁化率结果显示化合物1中金属离子之间存在反铁磁相互作用。     

含取代基苯基羧酸与柔性含氮配体构筑的三个过渡配位化合物的合成、晶体结构与物理性质

利用3,5-二硝基苯甲酸（3,5-DNBH）,1,2-双咪唑亚甲苯（1,2-bimb）与3种过渡金属盐通过水热反应成功地构筑3个过渡金属配位化合物,即[M（3,5-DNB）₂（1,2-bimb）]（M=Co（Ⅱ） （1）,Cd（Ⅱ）（3））和[Zn（3,5-DNB）₂（1,2-bimb）]_n （2）。通过红外光谱、元素分析、单晶和粉末X射线衍射表征了这三个化合物。化合物1和3是同构的,含有一个双核单元[M₂（COO）₂],该双核单元由金属离子、3,5-二硝基苯甲酸根以及1,2-bimb分子构成。双核单元再通过O…π弱相互作用形成超分子结构,该弱相互作用是通过3,5-二硝基苯甲酸根上的硝基氧原子与1,2-bimb上的苯环所形成。化合物2是一维链结构,链与链之间再通过3,5-二硝基苯甲酸根和1,2-双咪唑亚甲苯配体上苯环之间的π…π相互作用,形成了一个超分子结构。室温条件下研究了化合物2和3分散在甲醇中的荧光性质。热重测试结果显示3个化合物具有相对较高的热稳定性。可见光照射条件下化合物1对罗丹明B具有一定的催化降解能力。此外,直流磁化率结果显示化合物1中金属离子之间存在反铁磁相互作用。     

荷电(±1)对二十面体X_(13)(X=Cr,Mn,Fe,Co)团簇的稳定性与磁性的影响

采用基于密度泛函理论的计算方法,对正二十面体金属X13(X=Cr,Mn,Fe,Co)中性和荷电团簇进行了全面的结构优化计算,研究了荷电对团簇的稳定性和磁性的影响.结果表明:荷负电能够使团簇的稳定性增强;荷电对不同团簇的原子间距离的影响不同;同时荷电对不同团簇磁性的影响也是不一样的,尤其是荷负电能够使Fe13和Co13团簇的磁性大大增强;荷电对不同团簇磁性的影响不是通过原子间距离的变化来实现的,而是受到原子内部电荷的转移和杂化程度的影响.     

新型过渡金属配合物合成,磁性和生物活性

报道９种新的过渡金属［Ｃｒ（Ⅲ）、Ｍｎ（Ⅱ）、Ｆｅ（Ⅲ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）、Ｚｎ（Ⅱ）］五苯并咪唑甲基二乙三胺双核配合物的研究。变温磁化率分析结果表明，双核离子间存在反铁磁相互作用。对于二价过渡金属离子，磁交换作用大小为．对配合物进行了体外抗癌活性和农药活性测定，发现部分配合物具有生物活性。     

Salisaldehyde-2-aminobenzimidazole schiff base complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II)

New metal complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with salicylidine-2-aminobenzimidazole (SABI) are synthesized and their physicochemical properties are investigated using elemental and thermal analyses, IR, conductometric, solid reflectance and magnetic susceptibility measurements. The base reacts with these metal ions to give 1:1 (Metal:SABI) complexes; in cases of Fe(III), Co(II), Cu(II), Zn(II) and Cd(II) ions; and 1:2 (Metal:SABI) complexes; in case of Ni(II) ion. The conductance data reveal that Fe(III) complex is 2:1 electrolyte, Co(II) is 1:2 electrolyte, Cu(II), Zn(II) and Cd(II) complexes are 1:1 electrolytes while Ni(II) is non-electrolyte. IR spectra showed that the ligand is coordinated to the metal ions in a terdentate mannar with O, N, N donor sites of the phenloic -OH, azomethine -N and benzimidazole -N3. Magnetic and solid reflectance spectra are used to infer the coordinating capacity of the ligand and the geometrical structure of these complexes. The thermal decomposition of the complexes is studied and indicates that not only the coordinated and/or crystallization water is lost but also that the decomposition of the ligand from the complexes is necessary to interpret the successive mass loss. Different thermodynamic activation parameters are also reported, using Coats-Redfern method. This revised version was published online in July 2006 with corrections to the Cover Date.     

层状过渡金属硫代亚磷酸盐及其夹层化合物

层状过渡金属硫代亚磷酸盐(MPS₃)及其夹层物由于所表现出的特殊的固体物理化学性质而受到关注。本文将主要介绍层状过渡金属硫代亚磷酸盐及其夹层物的合成、结构及固体物理性质等方面的研究状况及进展。     

以[M(DETA)2)]n+(M=Cu2+, Ni2+, Co3+)为客体的MnPS3夹层化合物的合成、结构表征与磁性研究

将过渡金属配合物阳离子([M(DETA)₂]ⁿ⁺(M=Cu²⁺,Ni²⁺,Co³⁺;DETA=Diethylenetriamine,二乙烯三胺)作为客体插入层状MnPS₃层间得到了相应的3个夹层化合物。通过X-射线粉末衍射、元素分析和红外光谱对夹层化合物的结构进行了表征。结果表明,与主体MnPS₃ 0.65 nm的层间距相比较,夹层化合物(Mn_0.88PS₃[Cu(DETA)₂]_0.12)的层间距扩大了0.32 nm,由此推测客体[Cu(DETA)₂]²⁺在层间以平面四方的配位形式存在,而另2个夹层化合物(Mn_0.79PS₃[Ni(DETA)₂]_0.21和Mn_0.74PS₃[Co(DETA)₂]_0.17)的层间距扩大了0.48 nm,说明客体[(M(DETA)₂]ⁿ⁺,M=Co³⁺,Ni²⁺) 在主体层间以八面体配位形式存在。磁性测试结果表明过渡金属离子[(M(DETA)₂]ⁿ⁺(M=Cu²⁺,Co³⁺)的插入能引起主体MnPS₃的磁性在35~40 K发生由顺磁向亚铁磁性的转变并表现自发磁化,而客体[Ni(DETA)₂]²⁺却使夹层化合物的反铁磁相互作用增强,抑制了自发磁化的发生。     

Low Temperature Specific Heat Capacity of 3d Transition Metal Chlorine Boracites (T3B7O13Cl; T=Cr,Mn, Fe,Co, Ni,Cu, Zn or Mg)

The heat capacities of eight chlorine boracites T₃B₇O₁₃Cl (T=Cr, Mn, Fe, Co, Ni, Cu, Zn or Mg) have been measured in the temperature range 2 to 100 K. Magnetic phase transitions occur below 20 K in the compounds studied except in the two non-magnetic substances Zn₃B₇O₁₃Cl and Mg₃B₇O₁₃Cl. The magnetic specific heat capacities give information on magnetic ground state of the transition metals and the entropy related to the phase transitions. This revised version was published online in July 2006 with corrections to the Cover Date.     

含dppm桥的双核过渡金属配合物中金属─金属间的相互作用

应用ＥＨＭＯ法研究了一系列含ｄｐｐｍ双二苯基膦甲烷桥的双核过渡金属配合物［ＰｄＢｒ（ｄｐｐｍ）］_２，Ｍ_２Ｃｌ_２（μ－ＣＯ）（ｄｐｐｍ）_２（Ｍ＝Ｐｄ，Ｒｈ），［ＲｈＣｌ（ＣＯ）（ｄｐｐｍ）］_２，Ｍ_２－（μ－Ｃｌ）_２Ｃｌ_４（ｄｐｐｍ）_２（Ｍ＝Ｎｂ、Ｔａ、Ｒｅ、Ｒｕ）的电子结构。根据配合物的成键特征，对其金属－金属的相互作用进行了分析。计算结果可以作为解释这类配合物的某些物理化学性质的理论依据。     

一类五核平面开口型过渡金属原子簇电子吸收光谱和二阶非线性光学性质的TDDFT研究

运用TDDFT B3LYP/LanL2DZ方法, 研究了一类具有非中心对称的五核平面开口构型过渡金属原子簇化合物[MoS₄Cu₄(py)₆X₂] (X＝Br, I)的电子吸收光谱和静态二阶非线性极化率, 估算了晶体的宏观二阶非线性光学系数. 电子吸收光谱的计算结果与实验测量结果比较符合; 碘系簇合物的静态二阶非线性极化率大于溴系. 详细讨论了该类金属簇合物电子吸收光谱的归属及其相关联的电子跃迁方式; 在微观水平上阐述了其二阶非线性光学性质的起源. 研究结果表明外围无机卤素配体4p/5p轨道到簇芯[MoS₄]杂化轨道的电子转移对静态二阶非线性极化率的贡献大于有机配体的贡献; 而过渡金属簇芯内的电子转移也有较大的贡献. 这对于理解过渡金属原子簇化合物内的电子转移对光学激发的作用以及用来设计新的无机-有机杂化二阶非线性光学材料有较大的帮助.     

含dppm桥的双核过渡金属配合物中金属─金属间的相互作用

应用ＥＨＭＯ法研究了一系列含ｄｐｐｍ双二苯基膦甲烷桥的双核过渡金属配合物［ＰｄＢｒ（ｄｐｐｍ）］_２，Ｍ_２Ｃｌ_２（μ－ＣＯ）（ｄｐｐｍ）_２（Ｍ＝Ｐｄ，Ｒｈ），［ＲｈＣｌ（ＣＯ）（ｄｐｐｍ）］_２，Ｍ_２－（μ－Ｃｌ）_２Ｃｌ_４（ｄｐｐｍ）_２（Ｍ＝Ｎｂ、Ｔａ、Ｒｅ、Ｒｕ）的电子结构。根据配合物的成键特征，对其金属－金属的相互作用进行了分析。计算结果可以作为解释这类配合物的某些物理化学性质的理论依据。     

过渡金属取代的钨铝杂多配合物的制备、表征和性质

用分步设计法合成了以铝为中心原子的过渡元素与钨的三元杂多配合物,经ICP、TG分析确定其化学式为K_4，6，7[AlM(OH₂)W₁₁O₃₉]·xH₂O(M=V⁵⁺、Cr³⁺、Mn²⁺、Fe³⁺、Co²⁺、Ni²⁺、Cu²⁺、Zn²⁺、Cd²⁺)。采用IR、UV、XRD、¹⁸³W和²⁷Al NMR等对配合物的结构进行了表征,表明配合物具有Keggin结构；循环伏安法对该系列配合物的氧化还原性质研究表明,其氧化还原过程为不可逆的两电子还原,配合物的磁化率测试均表现为顺磁性,还对其热稳定性进行了讨论。     

Multinuclear Nuclear Magnetic Resonance Studies of 〔VS_4 (CuPPh_3)_5 (CuCl) Br_2〕

11NTRoDUCTIONThecomplexchemistryofthetetrathiometallatestMS,j"-(M=Mo,W,n==2lM=V,n=3)hasbeenextensivelyinvestigatedbecauseofitspotentialutilityinimi-tationofbiologicalsystems"'.Especially,vanadium-containingheterometallicsulfurcomplexesareofinterestasmodelsoftheactivesitesinmetalloenzymestobiomimeticchemistst2'33.Studiesonthiometalateandrelatedmultimetalcomplexeshavebeenmain1yaboutsynthesesandcrystalstructures,butNMRinvestigationswereraret43.SinceNMRspectroscopyrespondstothemagneticpro…     

Magnetische Wechselwirkungen in Inselstrukturen ternärer Cobaltchalkogenide. Die Spinstrukturen von Na6CoS4 und Na6CoSe4

Magnetic Interactions in Ternary Cobalt Chalcogenides containing Isolated Tetrahedral Cobalt Anionic Groups. The Spin Structures of Na₆CoS₄ and Na₆CoSe₄ The sodium cobalt chalcogenides Na₆CoS₄ and Na₆CoSe₄ are characterized by isolated [CoX₄]-units. Despite the large distances of more than 6 Å between the cobalt ions magnetic inter-actions at low temperatures lead to threedimensionally ordered spin structures, that were determined from neutron diffraction experiments. The magnetic structure can be described in the Shubnicov group P_2abc2₁ with a unit cell that is four times as large as the crystallographic cell. The magnetic moments of both compounds correspond to the value expected for three unpaired electrons per Co²⁺ ion.     

稀土元素X(X=Sc、Y、La、Ce、Eu)掺杂二维GaSe的电子结构、光学及磁学性质的第一性原理研究

基于密度泛函理论的第一性原理平面波赝势方法计算了稀土元素X (X=Sc、Y、La、Ce、Eu)掺杂二维GaSe的电子结构、光学和磁学性质。结果表明：Sc、Y、La掺杂二维GaSe的自旋向上通道和自旋向下通道完全对称,为非磁性p型半导体(带隙：2.661 1 eV)。在Ce、Eu掺杂二维GaSe后,体系转变成磁矩为0.908μ_B、7.163μ_B的磁性半导体。其中Eu掺杂二维GaSe后,自旋向上和自旋向下通道均出现杂质能级,增强了电子跃迁的概率。二维GaSe掺杂体系静态介电常数增加,极化能力增强;同时吸收光谱向低能区移动,发生红移现象,扩大了吸收光谱范围。尤其在低能区,该体系的光反射系数得到了提升。而在这些掺杂体系中,Eu掺杂二维GaSe体系展现出了最为明显的性能提升。     

稀土元素X(X=Sc、Y、La、Ce、Eu)掺杂二维GaSe的电子结构、光学及磁学性质的第一性原理研究

基于密度泛函理论的第一性原理平面波赝势方法计算了稀土元素X (X=Sc、Y、La、Ce、Eu)掺杂二维GaSe的电子结构、光学和磁学性质。结果表明:Sc、Y、La掺杂二维GaSe的自旋向上通道和自旋向下通道完全对称,为非磁性p型半导体(带隙:2.661 1 eV)。在Ce、Eu掺杂二维GaSe后,体系转变成磁矩为0.908μ_B、7.163μ_B的磁性半导体。其中Eu掺杂二维GaSe后,自旋向上和自旋向下通道均出现杂质能级,增强了电子跃迁的概率。二维GaSe掺杂体系静态介电常数增加,极化能力增强;同时吸收光谱向低能区移动,发生红移现象,扩大了吸收光谱范围。尤其在低能区,该体系的光反射系数得到了提升。而在这些掺杂体系中,Eu掺杂二维GaSe体系展现出了最为明显的性能提升。     

Electronic Structures of 3d-Metal Monolithides

Bond distances, vibrational frequencies, dipole moments, electron affinities, ionization potentials and dissociation energies of the title molecules in neutral, positively and negatively charged ions were studied by use of density functional method B3LYP. The calculated results were compared with experiments and previous theoretical studies. Ground electronic states for each molecule were assigned. It was found that for some molecules, low-lying state, in which the energy is much close to the ground state, was obtained. In this case, further studies both experimentally and theoretically are necessary in order to find the true global minimum.     

Polymeric Coordination Compounds Derived from Transition Metal(II) with Tetradentate Schiff‐base: Synthetic,Spectroscopic, Magnetic and Thermal Approach

The polymeric coordination compounds have been synthesized using the dipotassium salt of N,N′‐di(carboxymethylene)terephthalaldehydediimine (K₂SB¹) or N,N′‐di(carboxyethylene)terephthalaldehydediimine (K₂SB²) with manganese(II), cobalt(II), nickel(II), copper(II), zinc(II), and cadmium(II). The ligands have been characterized by ¹H‐NMR, and ¹³C‐NMR spectra. The polychelates have been characterized by elemental analyses, magnetic measurements, thermogravimetric analyses, electronic spectra and infrared spectra. The coordination compounds are colored, and the central metal ions are octahedrally coordinated with two water molecules and the Schiff bases. The Schiff bases act as di‐negative tetradentate ligands, in which bonding occurs through two oxygen and two nitrogen atoms. The polymers are insoluble in all common organic solvents such as acetone, methanol, ethanol, N,N‐dimethylformamide and dimethylsulfoxide.     

A New Organic-Inorganic Hybrid Nanocomposite, BEDT-TTF Intercalated into Layered FePS3

A new inorganic–organic hybrid compound, Fe_0.76PS₃(BEDT-TTF)_0.48 (BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene), has been synthesized by the reaction of the pre-intercalate Fe_0.90PS₃(Phen)_0.41 (phen=1,10-phenanthroline) with (BEDT-TTF)₂I_x. The powder X-ray diffraction (XRD) results show that the expansion of the lattice spacing (Δ d) is about 4.0 Å compared with the pristine FePS₃, indicating that the molecular ring plane of the guest is parallel to the layer of the host. The infrared spectrum of the intercalate shows the existence of BEDT-TTF as a guest between the interlayer region of the layered FePS₃. The room-temperature electrical conductivity of the compressed pellet of Fe_0.76PS₃(BEDT-TTF)_0.48 is about 10⁻⁷ S/cm, which is in the same order of magnitude as that of the pristine FePS₃(10⁻⁷ S/cm). The magnetic properties measured with a SQUID-magnetometer indicate that Fe_0.76PS₃(BEDT-TTF)_0.48 exhibits the paramagnetism from 120 to 300 K and Curie-Weiss Law was obeyed above 140 K, but a strong antiferromagnetic phase transition occurs at T_N of 100 K.