由4,4'-二甲基-2,2'-联苯二甲酸配体构筑的锌(Ⅱ)和镉(Ⅱ)双核配合物的合成、晶体结构、荧光及光催化性质

采用水热方法，用4，4''-二甲基-2，2''-联苯二甲酸配体（H₂dbda）和菲咯啉（phen）、2，2''-联吡啶（2，2''-bipy）分别与ZnCl₂或Cd-Cl₂·H₂O反应，合成了3个零维双核配合物[Zn₂（μ-dbda）₂（phen）₂（H₂O）₂]（1）、[Zn₂（μ-dbda）₂（2，2''-bipy）₂]（2）和[Cd₂（μ-dbda）₂（2，2''-bipy）₂（H₂O）₂]·2H₂O（3），并对其结构、荧光和光催化性质进行了研究。结构分析结果表明3个配合物分别属于三斜和单斜晶系的P1和P2₁/n空间群。配合物1~3都具有零维双核结构，而且这些双核单元通过O-H…O氢键作用进一步形成了三维超分子框架。研究表明，配合物1~3在室温下能发出蓝色荧光。另外，研究了3个配合物对有机染料亚甲基蓝的光催化降解性能，结果表明配合物3可以高效地降解亚甲基蓝。     

由联苯三羧酸和含氮配体构筑的钴(Ⅱ)、铅(Ⅱ)和锌(Ⅱ)配合物的合成、晶体结构及荧光性质

采用水热方法，用联苯三羧酸配体（H₃btc）和菲咯啉（phen）或2，2''-联吡啶（2，2''-bipy）分别与CoCl₂·6H₂O、PbCl₂和ZnCl₂反应，合成了一个单核配合物[Co（Hbtc）（phen）₂（H₂O）]·3H₂O（1）以及2个一维链状配位聚合物[Pb（μ₃-Hbtc）（2，2''-bipy）]_n（2）和{[Zn₃（μ₂-btc）₂（μ₂-H₂O）（2，2''-bipy）₃（H₂O）₅]·8H₂O}_n（3），并对其结构和荧光性质进行了研究。结构分析结果表明3个配合物分别属于正交和三斜晶系，Pna2₁和P1空间群。配合物1具有零维单核结构，而且这些单核钴单元通过O-H…O氢键作用进一步形成了三维超分子框架。而配合物2和3具有基于双核单元的一维链结构。研究表明，配合物2和3在室温下能发出蓝色荧光。     

三角柔性多羧酸金属有机骨架化合物的合成、结构及荧光性质

以柔性1,3,5-三（4-羧酸苯氧基）苯（H₃TCPB）为配体,以4,4''-联吡啶（4,4''-BPY）为辅助配体,在溶剂热条件下合成了2个新颖的分别具有三核锌簇和三核钴簇的金属有机骨架化合物：{[Zn₃（TCPB）₂（4,4''-BPY）]·DMF·3H₂O}_n（1）和{[Co_1.5（TCPB）（DMF）（H₂O）]·DMF}_n（2）,通过单晶X射线衍射,红外光谱,元素分析,热重分析和粉末X射线衍射对其结构进行了表征。单晶X射线衍射分析表明化合物1属于三斜晶系,P1空间群,表现出三维（3,8）连接的网状结构,拓扑符号为：{4³}₂·{4⁶·6¹⁸·8⁴}·{6};化合物2也属于三斜晶系,P1空间群,为二维（3,6）连接的网络层状结构,拓扑符号为：{4³}₄·{4⁶·6¹⁸·8⁴}。此外,荧光性质研究表明固态化合物¹在室温条件下发射出源于TCPB^3-和4,4''-BPY配体的淡蓝色荧光,而化合物2在相似的条件下没有荧光发射。     

一硼化铪的晶体结构预测与构效关系基因

利用基于进化算法的晶体结构预测软件USPEX,并结合第一性原理方法对HfB的稳定晶体结构进行全局搜索。在基态条件下,新发现2个HfB晶体结构（空间群：P6m2和R3m）。其中,P6m2结构比已报道的HfB晶体结构（空间群：Pnma、Cmcm、I4₁/amd和Fm3m）具有更低的基态能量。这些结构中,B原子分别以二维类石墨烯（P6m2和R3m结构）,zig-zag链（Pnma、Cmcm和4₁/amd结构）和孤立原子（Fm3m结构）₃种形式存在,从而导致它们具有显著的化学键合特征、高温稳定性和强韧特性差异。     

3-甲基-4-乙基-5-[2(或4)-吡啶基]-1,2,4-三唑银(Ⅰ)配合物的合成、晶体结构和光学性质

以3-甲基-4-乙基-5-（2-吡啶基）-1,2,4-三唑（L）和3-甲基-4-乙基-5-（4-吡啶基）-1,2,4-三唑（L''）为配体分别合成了2个银（Ⅰ）配合物[Ag₂（μ-L）₂L₂（NO₃）₂]（1）和{[Ag₂（μ-L''）₂（H₂O）₂]（NO₃）₂}_n（2）,测定了X射线单晶结构,用红外光谱、荧光和热重等进行了表征。2个配合物都属于三斜晶系,空间群为P1。晶体结构分析表明2个配合物都具有畸变的四面体结构[AgN₃O]。配合物1是一个双核银（Ⅰ）配合物,NO₃^-参与配位;而配合物2是一个配位聚合物,水分子参与配位。     

2-氯-4-氟苯甲酸与5，5'-二甲基-2，2'-联吡啶镧系配合物的晶体结构、光谱和热行为

合成并表征了2个双核配合物[Pr （2-Cl-4-FBA）₃（5,5''-DM-2,2''-bipy）]₂（1）和[Dy （2-Cl-4-FBA）₃（5,5''-DM-2,2''-bipy）]₂·2（2-Cl-4-FHBA）（2）,其中2-Cl-4-FHBA=2-氯-4-氟苯甲酸,5,5''-DM-2,2''-bipy=5,5''-二甲基-2,2''-联吡啶。配合物1以八配位的Pr³⁺为中心,其周围的配位环境为扭曲的三角十二面体。配合物2的结构是独特的,它包含2个自由的2-氯-4-氟苯甲酸分子,并以九配位的Dy³⁺为中心与周围的氮、氧原子形成扭曲的三棱镜几何构型。这2个配合物均结晶于三斜晶系P1空间群,并通过氢键相互作用和π-π堆积作用形成了一维和二维超分子结构。研究了配合物的热分解过程,结果表明配合物1和2分别分为4步和5步进行分解。同时对配合物的三维红外堆积图进行了研究,结果表明,整个热分解过程中释放出的主要气态产物是水、二氧化碳和有机小分子碎片。配合物2的荧光性质研究表明,它可以发射出Dy³⁺的特征跃迁对应的荧光。     

联苯-2,4,4',6-四甲酸银、咪唑-菲啰啉-苯氧乙酸镉配位聚合物的合成、结构及与DNA的相互作用

由联苯-2,4,4'',6-四甲酸（H₄BPTC,C₁₆H₁₀O₈）和2-4-（1H-咪唑-2-[4,5-f][1,10]菲啰啉基）苯氧乙酸（HPIMPHC,C₂₁H₁₄N₄O₃）,水热合成了2种新型配位聚合物[Ag₄（BPTC）]_n（1）,[Cd（PIMPHC）₂]_n（2）。用元素分析、红外光谱、热重分析和X射线单晶衍射对配合物进行了表征和结构分析。配合物1属三斜晶系,空间群为P1;Ag（Ⅰ）的配位数分别为4、3、2,配位构型为变形四面体、平面三角形和V型。配合物2属正交晶系,空间群为Pbcn;Cd（Ⅱ）的配位数为6,配位构型为变形的八面体,Cd（Ⅱ）离子间通过三齿配体PIMPHC-桥连,形成2D网状结构。用EtBr荧光探针法研究了配体及配合物与ct-DNA的相互作用。     

3-甲基-4-乙基-5-[2(或4)-吡啶基]-1，2，4-三唑银(Ⅰ)配合物的合成、晶体结构和光学性质

以3-甲基-4-乙基-5-（2-吡啶基）-1,2,4-三唑（L）和3-甲基-4-乙基-5-（4-吡啶基）-1,2,4-三唑（L''）为配体分别合成了2个银(Ⅰ)配合物[Ag2（μ-L）₂L₂（NO₃）₂]（1）和{[Ag₂（μ-L''）₂（H₂O）₂]（NO₃）₂}_n（2）,测定了X射线单晶结构,用红外光谱、荧光和热重等进行了表征。2个配合物都属于三斜晶系,空间群为P1。晶体结构分析表明2个配合物都具有畸变的四面体结构[AgN₃O]。配合物1.是一个双核银(Ⅰ)配合物,NO₃^-参与配位;而配合物2是一个配位聚合物,水分子参与配位。     

由醚氧桥联四羧酸配体构筑的两个一维镉(Ⅱ)配位聚合物的合成、晶体结构及荧光性质

采用水热方法，用醚氧桥联四羧酸配体（H₄L）和菲咯啉（phen）、2，2''-联吡啶（2，2''-bipy）与CdCl₂·H₂O反应，合成了2个一维配位聚合物[Cd₂（μ₅-L）（phen）₂]_n（1）和{[Cd₂（μ₄-L）（2，2''-bipy）₂（H₂O）₂]·2H₂O}_n（2），并对其结构和荧光性质进行了研究。结构分析结果表明2个配合物分别属于单斜和三斜晶系，P2₁/c和P1空间群。聚合物1和2分别具有基于四核Cd⁴和Cd²单元的一维链结构。研究表明，配合物1和2在室温下能发出蓝色荧光。     

联苯-2,4,4',6-四甲酸银、咪唑-菲啰啉-苯氧乙酸镉配位聚合物的合成、结构及与DNA的相互作用

由联苯-2,4,4'',6-四甲酸（H₄BPTC,C₁₆H₁₀O₈）和2-4-（1H-咪唑-2-[4,5-f] [1,10]菲啰啉基）苯氧乙酸（HPIMPHC,C₂₁H₁₄N₄O₃）,水热合成了2种新型配位聚合物[Ag₄（BPTC）]_n（1）,[Cd（PIMPHC）₂]_n（2）。用元素分析、红外光谱、热重分析和X射线单晶衍射对配合物进行了表征和结构分析。配合物 1 属三斜晶系,空间群为P1;Ag（Ⅰ）的配位数分别为4、3、2,配位构型为变形四面体、平面三角形和V型。配合物2属正交晶系,空间群为Pbcn;Cd（Ⅱ）的配位数为6,配位构型为变形的八面体,Cd（Ⅱ）离子间通过三齿配体 PIMPHC^-桥连,形成2D网状结构。用EtBr荧光探针法研究了配体及配合物与ct-DNA的相互作用。     

Synthetic, spectral and solution studies on imidazolate-bridged copper(II)-copper(II) and copper(II)-zinc(II) complexes

Synthesis, spectral and solution studies on 2-ethyl imidazolate-bridged (2-EtIm) homo-binuclear copper(II)-copper(II) and hetero-binuclear copper(II)-zinc(II) homologue are described. Magnetic moment values of homo-binuclear complexes indicate that the imidazolate group can mediate antiferromagnetic interactions. Optical spectra of hetero-binuclear complex at varying pH values suggest that the imidazolate-bridged complex is stable over the pH-range 7.15–10.0.     

N,N'-双水杨酰代乙二胺合铜(II)酸根和N,N'-1,2-双水杨酰代丙二胺合铜(II)酸根的Cu(II)-Co(II)双核酸合物的合成和磁性

本文合成了两个新型双核配合物, [Cu(Samen)Co(L)2]和[Cu(Sampn)Co(L)2], Samen^4^-表示N,N'-双水杨酰代乙二胺根阴离子,Sampn^4^-表示N,N'-1,2-双水杨酰代丙二胺根阴离子, L表示5-硝基-1,10-菲咯啉(NO2-Phen)。经元素分析, IR和电子光谱等推定配合物具有酚氧桥结构,Cu(II)及Co(II)的配位环境分别为平面四方及畸变八面体构型。测定了配合物(4-300K)的变温磁化率, 并用最小二乘法和自旋Hamiltonian算符,H=2JS1.S2-DSzl导出的磁方程拟合, 求得交换参数为J=-4.39(Samen)和-3.59cm^-^1(Sampn), 表明两个Cu(II)-Co(II)双核配合物中有弱的反铁磁性超交换相互作用。     

Magnetic,epr and SOD studies of some Cu(II)-Cu(II), Cu(II)-Ni(II) and Cu(II)-Zn(II) imidazolate bridged complexes

Magnetic, spectroscopic and superoxide dismutase activity of imidazolate bridged [(Salala)Cu-Im-Cu(Salala)]Na, [(Salala)Cu-Im-Zn(Salala)]Na and [(Salala)Cu-Im-Ni(Salala)]Na (Salala=Salicyledenealiniate, Im=Imdiazolate) are described. The epr and electronic spectra of related mononuclear complexes, viz., [(Salala)Cu-OH(2)] and [(Salala)Cu-ImH] also described. Appearance of a half-field signal in polycrystalline and decrease in mu(eff) per copper(II) ion indicate super exchange coupling between copper(II) ion in [(Salala)Cu-Im-Cu(Salala)]Na binuclear complex. A pH-dependent epr and UV-vis study of 50% aqueous DMSO solution of binuclear complexes suggest that the complexes are stable in narrow pH range.     

Synthesis, structural characterization, and photophysical, electrochemical, intercomponent energy-transfer, and anion-sensing studies of imidazole 4,5-bis(benzimidazole)-bridged Os(II)Os(II) and Ru(II)Os(II) bipyridine complexes

Homo- and heterobimetallic complexes of composition [(bpy)(2)M(II)(H(2)Imbzim)M'(II)(bpy)(2)](ClO(4))(3)·nH(2)O, where M(II) = M'(II) = Os (1), M(II) = Ru and M'(II) = Os (2), H(3)Imbzim = 4,5-bis(benzimidazole-2-yl)imidazole, and bpy = 2,2'-bipyridine, have been synthesized and characterized using standard analytical and spectroscopic techniques. Both of the complexes crystallized in monoclinic form with the space group P2(1)/m for 1 and P2(1)/n for 2. The absorption spectra, redox behavior, and luminescence properties of the complexes have been thoroughly investigated. The complexes display very intense, ligand-centered absorption bands in the UV region and moderately intense metal-to-ligand charge-transfer (MLCT) bands in the visible region. The bimetallic complexes show two successive one-electron reversible metal-centered oxidations. The strong fluorescence of free H(3)Imbzim is completely quenched in the metal complexes by energy transfer to the metal-based units, which exhibit their characteristic MLCT phosphorescence. The luminescence data of the heterometallic complex 2 show that electronic energy transfer takes place from the ruthenium center to the osmium-based component. The anion binding properties of the complexes have been studied in solutions using absorption, emission, and (1)H NMR spectral measurements. The metalloreceptors act as sensors for F(-) and AcO(-) ions. Sensing studies indicate the presence of two successive anion-induced deprotonation steps, leading to the formation of [(bpy)(2)M(HImbzim)M'(bpy)(2)](2+) and [(bpy)(2)M(Imbzim)M'(bpy)(2)](+) species. Double deprotonation is also observed in the presence of hydroxide. The binding affinities of different anions toward the receptors have been evaluated. Cyclic voltammetry measurements carried out in acetonitrile have provided evidence in favor of anion-dependent electrochemical responses of the bimetallic metalloreceptors with F(-) and AcO(-) ions.     

N,N'-乙二水杨酰胺合铜(II)酸根和N,N'-1,2-丙二水杨酰胺全铜(II)酸根的双核Cu(II)-Fe(III)配合物的合成和磁性

本文合成了四个新型双核配合物、[Cu(samen)Fe(L)Cl]和[Cu(sampn)Fe(L)Cl]。经元素分析、IR, 电导、磁性测量等手段推定配合物具有酚氧桥结构, Cu(II)及Fe(III)的配位环境分别为平面四方及四角锥的构型, Fe(III)离子的自旋态S=3/2。测定了配合物[Cu(samen)Fe(L)Cl]的变温磁化率(4-300K), 参数J和θ值表明两个双核配合物中金属离子之间有中等程度的反铁磁性超交换作用和双核单元之间有弱的分子间相互作用。     

Thermal behavior of Cu(II)-, Cd(II)-, and Hg(II)-exchanged montmorillonite complexedwith cysteine

The thermal behavior of montmorillonite and organically modified montmorillonite, both treated with heavy metal cations [Cu(II), Cd(II) and Hg(II)], was characterized via thermal analyses (TG, DTG and DTA) combined with evolved species gas mass spectrometry (MS-EGA), and X-ray diffraction at in situ controlled temperature (HTXRD). The reactions involving Cu(II)- and Cd(II)-montmorillonite samples are mostly related to H₂O and OH loss, unlike Hg(II)-montmorillonite, where effects associated to Hg(II) loss are also present. Finally reactions related to dehydration, dehydroxylation and to organic matter decomposition can be observed in montmorillonite samples treated with cysteine.     

Diaza-crown-N,N-dialkanoic acids copper(II) and dicopper(II) complexes

Twelve-, fifteen-, and eighteen-membered diaza-crown-N, N-′dialkanoic acids LH₂ and their inner salt copper(II) complexes CuL and dicopper complex [CuL(3). CuCl₂. CH₃OH_n were obtained. The complexes of 15- and 18-membered ligands contain Cu²⁺ ion inside the ring.     

Equilibrium studies of Mn(II), Mg(II), Ca(II), Sr(II) and Ba(II) withp-fluoro-,p-chloro-,p-bromo-,p-methyl-benzoylacetones and 1-(4-fluorophenyl)-1,3-pentanedione

The rawpH-data, obtained from the potentiometric titrations of the titled ligands with NaOH in 75% (v/v) dioxane-water mixture performed at 20, 30 and 40°C at constant ionic strength (=0.1M-NaClO₄), have been adequately corrected for dilution, and solvent effects in order to evaluate thermodynamic dissociation constants. Variance of the latter as a function of temperature has also been accounted for. The differing magnitudes of thermodynamic dissociation constants of the titled ligands have been explained on the basis of the non coplanar orientation of the phenyl ring in the ligands and a comparison has been made with those of unsubstituted benzoylacetone, dibenzoylmethane and acetylacetone.Following similar technique, thermodynamic stepwise and overall formation constants of the titled metal-ligand systems have been obtained and the results correlated with ligand basicity inverse metal crystal radii and second potentials of metals. Decrease in the free enthalpy (–G) of complexation reaction has also been evaluated.

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Untersuchung der Gleichgewichte von Mn(II), Mg(II), Ca(II), Sr(II) und Ba(II) mit p-Fluor-, p.-Chlor-, p-Brom-, p-Methyl-benzoylaceton und 1-(4-Fluorphenyl)-1,3-pentanedion

Zusammenfassung Aus der potenitometrischen Titration der Titelverbindungen mit NaOH in 75 (v/v) Dioxan—Wasser bei, 20, 30 und 40°C bei konstanter Ionenstärke (=0,1M-NaClO₄) wurden die thermodynamischen Dissoziationskonstanten ermittelt. Verdünnungs-, Lösungsmittel-und Temperatureffekte wurden berücksichtigt. Die unterschiedlichen Dissoziationskonstanten werden mit der Nichtplanarität des Phenylrings in den Liganden erklärt. Außerdem wurden die Komplexbildungskonstanten bestimmt; sie sind in die Diskussion miteinbezogen.

     

The equilibrium constants of cadmium(II)-, lead(II)-, magnesium(II)-, and zinc(II)-alpha,beta,gamma,delta-tetrakis(1-methylpyridinium-4-yl)porphine complexes

The equilibrium constants of alpha,beta,gamma,delta-tetrakis(1-methylpyridinium-4-yl)porphine (TMPyP) complexes of cadmium(II), lead(II), magnesium(II), and zinc(II) were spectrophotometrically determined using the absorption spectra at the Soret band and the fluorescence spectra. The values of the following constants at 25 degrees C and ionic strength 0.1M were evaluated: K(PbP) = 10(-8.07 +/- 0.09), K(CdP) = 10(-7.68 +/- 0.03), K(ZnP) = 10(1.72 +/- 0.08), and K(MgP) = 10(-7.40 +/- 0.08) by the acid hydrolysis reaction of the TMPyP-metal complex at various pHs; K(PbP) = 10(-7.80 +/- 0.04) and K(CdP) = 10(-7.38 +/- 0.04) were determined by the ligand exchange reaction between TMPyP and nitrilotriacetic acid.