三个镧系金属氮氧自由基配合物的合成、结构及磁性

以氮氧自由基为配体,合成了3例氮氧自由基-稀土三自旋单核配合物[Ln（hfac）₃（NIT-Ph-4-Br）₂]（Ln=Gd（1）,Tb（2）,Dy（3）,hfac=六氟乙酰丙酮,NIT-Ph-4-Br=4,4,5,5-四甲基-2-（4''-溴）-咪唑啉-3-氧化-1-氧基自由基。单晶结构分析表明3个配合物均属单斜晶系P2₁/c空间群,配合物中的Ln（Ⅲ）离子为八配位模式,并且拥有相似的自由基-稀土-自由基单核结构。对配合物的磁性测试结果表明,配合物1中自由基与Gd（Ⅲ）离子之间存在着铁磁相互作用,自由基与自由基之间存在着反铁磁相互作用;配合物2,3中,稀土离子与自由基之间存在弱的反铁磁相互作用。     

三个镧系金属氮氧自由基配合物的合成、结构及磁性

以氮氧自由基为配体,合成了3例氮氧自由基-稀土三自旋单核配合物[Ln（hfac）₃（NIT-Ph-4-Br）₂]（Ln=Gd（1）,Tb（2）,Dy（3）,hfac=六氟乙酰丙酮,NIT-Ph-4-Br=4,4,5,5-四甲基-2-（4''-溴）-咪唑啉-3-氧化-1-氧基自由基。单晶结构分析表明3个配合物均属单斜晶系P2₁/c空间群,配合物中的Ln(Ⅲ)离子为八配位模式,并且拥有相似的自由基-稀土-自由基单核结构。对配合物的磁性测试结果表明,配合物1中自由基与Gd(Ⅲ)离子之间存在着铁磁相互作用,自由基与自由基之间存在着反铁磁相互作用;配合物2,3中,稀土离子与自由基之间存在弱的反铁磁相互作用     

双功能镧系化合物：合成、结构、磁性和荧光性质（英文）

利用N-succinopyridine(HL)配体,成功合成了2个同构型镧系化合物[Ln(HL)2(H2O)4]Cl3(Ln=Pr (1),Eu (2))并对其进行了结构表征。1和2均由羧酸配体双桥联金属离子形成1D链结构,再通过氢键进一步相互连接构成了3D超分子结构。变温磁化率测试表明1中Pr(Ⅲ)离子之间存在反铁磁相互作用,而在2中,Eu(Ⅲ)离子之间则表现出弱铁磁相互作用。固态发光测试观察到2可以发出很强的红光,但由于Pr(Ⅲ)离子的能隙较大,未观察到1的特征峰。     

基于反-双(β-二酮)-1,4-环己二胺的席夫碱Hg(Ⅱ)配位聚合物的合成与晶体结构

合成了反1,4-环己二胺桥联β-二酮的席夫碱配体L1（反-双（乙酰丙酮）-1,4-环己二胺）和L2（反-双（苯甲酰丙酮）-1,4-环己二胺）,然后将配体L1和L2分别与HgCl₂、HgI₂进行配位反应,得到4个Hg（Ⅱ）配合物：[Hg₂（L1）Cl₄]_n（1）,{[Hg₂（L2）Cl₄]·L2}_n（2）,[Hg₂（L1）I₄]_n（3）,[Hg₂（L2）I₄]_n（4）。并通过元素分析、红外光谱、粉末衍射、单晶X射线衍射等对配合物的结构进行了表征。在固体状态下,配合物1和2的Hg（Ⅱ）离子与配体中的γ-C原子及3个氯离子配位形成1D链结构,配合物3的Hg（Ⅱ）离子与L1配体中的烯醇式氧原子,以及3个碘离子配位形成2D网状结构,配合物4的Hg（Ⅱ）离子与配体L2中的烯醇式氧原子及3个碘离子配位形成1D链结构。     

基于反-双(β-二酮)-1,4-环己二胺的席夫碱Hg(II)配位聚合物的合成与晶体结构

合成了反1,4-环己二胺桥联β-二酮的席夫碱配体L1（反-双（乙酰丙酮）-1,4-环己二胺）和L2（反-双（苯甲酰丙酮）-1,4-环己二胺）,然后将配体L1和L2分别与HgCl₂、HgI₂进行配位反应,得到4个Hg（Ⅱ）配合物：[Hg₂（L1）Cl₄]_n（1）,{[Hg₂（L2）Cl₄]·L2}_n（2）,[Hg₂（L1）I₄]_n（3）,[Hg₂（L2）I₄]_n（4）。并通过元素分析、红外光谱、粉末衍射、单晶X射线衍射等对配合物的结构进行了表征。在固体状态下,配合物1和2的Hg（Ⅱ）离子与配体中的γ-C原子及3个氯离子配位形成1D链结构,配合物3的Hg（Ⅱ）离子与L1配体中的烯醇式氧原子,以及3个碘离子配位形成2D网状结构,配合物4的Hg（Ⅱ）离子与配体L2中的烯醇式氧原子及3个碘离子配位形成1D链结构。     

萘咪唑类稀土配合物的晶体结构和荧光性质

通过2-（2’-羟基-3’-甲氧基）萘咪唑（HL）和Ln（NO）3·6H₂O反应,合成了4种单核稀土配合物[Ln（HL）₂（NO₃）₃]·CH₂Cl₂（Ln=Sm（1）,Eu（2）,Tb（3））和[Ln（HL）₂（NO₃）₂（CH₃OH）]NO₃·CH₃OH（Ln=Yb（4））。X射线单晶衍射分析表明配合物1~4均通过配体萘环间的π-π作用呈现蝴蝶状结构。荧光性质表明仅有配合物4显示Yb³⁺稀土离子的特征发光,固态和在乙腈溶液中的荧光寿命分别为8.27 μs和4.40 μs。     

萘咪唑类稀土配合物的晶体结构和荧光性质

通过2-（2''-羟基-3''-甲氧基）萘咪唑（HL）和Ln（NO）₃·6H₂O反应,合成了4种单核稀土配合物[Ln（HL）₂（NO₃）₃]·CH₂Cl₂（Ln=Sm（1）,Eu（2）,Tb（3））和[Ln（HL）₂（NO₃）₂（CH₃OH）]NO₃·CH₃OH（Ln=Yb（4））。X射线单晶衍射分析表明配合物1~4均通过配体萘环间的π-π作用呈现蝴蝶状结构。荧光性质表明仅有配合物4显示Yb³⁺稀土离子的特征发光,固态和在乙腈溶液中的荧光寿命分别为8.27 μs和4.40 μs。     

具有磁弛豫和荧光性能的氮氧自由基-稀土离子环形双核

选用手性氮氧自由基与稀土离子反应,成功组装了 2 例 2p-4f 异自旋内消旋配合物[Ln(hfac)₃((R)-MePP-Ph-NIT)]₂,其中Ln=Eu (1)、Dy (2),hfac=六氟乙酰丙酮,(R)-MePP-Ph-NIT=2-(4-((R)-tert-butyl-2-methylpiperazine-1-carboxylate)phenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide。在配合物中,氮氧自由基配体连接2个稀土离子形成环形双核结构。配合物1展现出铕离子的特征荧光。在配合物2中,磁弛豫相关的频率依赖的虚部信号说明了其单分子磁体的特性。     

3-乙基-2-乙酰吡嗪缩4-苯基氨基脲Ag(I)配合物的合成、结构和DNA结合性质

合成并通过单晶衍射、元素分析及红外光谱表征了配合物[Ag₂（HL）（NO₃）₂]_n（1）的结构（HL为3-乙基-2-乙酰吡嗪缩4-苯基氨基脲）。单晶衍射结果表明,配合物1中,HL作为中性四齿配体连接2个Ag（I）中心,其中一个Ag（I）中心与HL配体中的ON₂供体（羰基O,亚胺N和吡嗪N1原子）和2个单齿硝酸根配位,构成扭曲的四方锥配位构型;而另一个Ag（I）离子与1个单齿硝酸根,1个双齿硝酸根和HL配体中的吡嗪N4原子配位,形成扭曲平面正方形配位构型。另外,相邻的Ag（I）离子通过桥联的硝酸根离子相互连接形成二维层状结构;此外,配合物1与DNA的相互作用强于配体。     

具有磁弛豫和荧光性能的氮氧自由基-稀土离子环形双核

选用手性氮氧自由基与稀土离子反应,成功组装了2例2p-4f异自旋内消旋配合物[Ln (hfac)₃((R)-MePP-Ph-NIT)]₂,其中Ln=Eu (1)、Dy (2),hfac=六氟乙酰丙酮,(R)-MePP-Ph-NIT=2-(4-((R)-tert-butyl-2-methylpiperazine-1-carboxylate) phenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide。在配合物中,氮氧自由基配体连接2个稀土离子形成环形双核结构。配合物1展现出铕离子的特征荧光。在配合物2中,磁弛豫相关的频率依赖的虚部信号说明了其单分子磁体的特性。     

Über die Mischkristallbildung von ThN mit LaN,CeN, PrN,NdN, SmN,GdN, DyN und ErN

X-Ray studies of the mixed nitride phases indicate complete solid solubility in all cases.

Teilauszug aus der Dissertation von Dipl.-Ing.J. Waldhart Technische Universität Wien.     

Ternary metal borides [La,Ce,Pr,Nd,Sm] Os4B4 and [Y,La,Ce,Pr,Nd,Sm,Gd,Tb] Ir4B4 with NdCo4B4-type structure

New ternary metal borides with compositionR. E. T ₄B₄ (R. E.=rare earth metal,T=transition metal) have been synthesized within the systems [La,Ce,Pr,Nd,Sm]–Os–B and [Y, La, Ce, Pr, Nd, Sm, Gd, Tb]–Ir–B. All compounds were found to be crystallizing with NdCo₄B₄-type structure. Magnetic measurements (80–300 K,Curie-Weiss behaviour, _p ~ 16K and µ_eff=9.94µ_B for TbIr₄B₄) indicate Y andR. E. elements (except Ce) to be trivalent in these compounds. The crystal chemistry of the isotypic series [Y,R. E.] [Os,Ir]₄B₄ is discussed.

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Ternäre Metallboride. [La,Ce,Pr,Nd,Sm] Os₄B₄ und [Y,La,Ce,Pr,Nd,Sm,Gd,Tb] Ir₄B₄ mit NdCo₄B₄-Struktur

Zusammenfassung Es wurden neue Metallboride der ZusammensetzungR. E. T ₄B₄ (R. E.=Seltenerdmetall,T=Übergangsmetall) innerhalb der Systeme [La,Ce, Pr,Nd,Sm]–Os–B und [Y,La,Ce,Pr,Nd,Sm,Gd,Tb]–Ir–B hergestellt. Alle Verbindungen kristallisieren entsprechend dem NdCo₄B₄-Typ. Magnetische Messungen (80–300K,Curie-Weiss-Verhalten, _p ~ 16K und µ_eff=9.94µ_B für TbIr₄B₄) zeigen an daß Y und dieR. E.-Elemente (ausgenommen Ce) in diesen Verbindungen trivalent sind. Die Kristallchemie der isotypen [Y,R. E.][Os,Ir]₄B₄-Verbindungen wird diskutiert.

     

Über die Mischbarkeit von ThC mit LaN,CeN, PrN,NdN, SmN,GdN und ErN

ThC is completely miscible with LaN, CeN, PrN, NdN, SmN and GdN at 1800°C. A miscibility gap is observed in the system ThC–ErN.

     

Über die Mischbarkeit von UN mit LaN,CeN, PrN,NdN, SmN,GdN, DyN,und ErN

X-Ray studies of the mixed nitride phases indicate complete miscibility in all cases. Lattice parameters generally showed negative deviations from the additivity rule.

Teilauszug aus der Dissertation des Dipl.-Ing.J. Waldhart an der Technischen Universität Wien, Österreich.     

Hydrazyl,Nitronyl-, and imino-nitroxides: Synthesis,properties and reaction with nitric oxide and nitrogen dioxide

Ten novel and stable free radicals of nitronyl-, imino-nitroxide and hydrazyl type compounds were synthesized and their physico-chemical properties investigated. UV-Vis and ESR spectroscopic data, as well as the lipophilicities and specific hydrophobic areas of the compounds are compiled. The reaction of these radical compounds with nitric oxide and nitrogen dioxide was also investigated. The radicals synthesized, show selectivity in their reaction with these nitric oxides, depending on their structure (nitronyl-nitroxide radicals react with NO, while hydrazyl radicals react with NO₂). The processes are easily monitored by UV-Vis or ESR spectroscopy.     

A comparison of sequential extraction procedures for fractionation of arsenic,cadmium, lead,and zinc in soil

Twelve soil samples differing in physicochemical properties and total element contents were extracted by three sequential extraction procedures to determine As, Cd, Pb, and Zn bound to individual soil fractions and are defined by individual operational procedures. In the case of arsenic, two additional sequential extraction schemes were designed entirely for fractionation of soil containing arsenic were tested. The results confirmed that determination of element proportions bound to individual soil fractions is strongly dependent on the extracting agent and/or procedure applied within individual extracting schemes. As expected, absolute values of the elements released among the individual extracting procedures are weakly comparable. More reliable results were determined for the more mobile soil elements i.e. cadmium and zinc, in the fractions characterizing the most mobile proportions of investigated elements where significant correlations with basic soil characteristics were observed. In contrast, ambiguous results were observed for As and Pb, for both the individual extraction procedures and the effect of the soil characteristics. Regardless of the studied element, the poorest results were determined for reducible and oxidizable soil fractions. The application of at least two independent procedures or modification of the extraction scheme according to element investigated and/or particular soil characteristics can also be helpful in definition of element pattern in soils in further research.     

Concerning the absorption and emission properties of phenanthro[1,10,9,8,o,p,q,r,a]perylene-7,14-dione

Summary In contrast to hitherto published data, phenanthro[1,10,9,8,o,p,q,r,a]perylene-7,14-dione, the fundamental chromophoric system of hypericin type compounds, exhibits an absorption with a long wavelength band at 423 nm in aprotic solvents like dimethylsulfoxide (7000). Its fluorescence in these solvents is below the detection limit. In protic solvents like methanol, the long wavelength absorption is bathochromically shifted to 546 nm, and a fluorescence at 565 nm is observed. This behavior was interpreted from the reversal ofn – * and – * transitions. The data have not been recorded yet due to the very low solubility of this compound. Its monoprotonation in ground and excited states is characterized bypK _a andpK* _a values of –6 and 2; diprotonation occurs at apK _a=–7.

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Absorptions- und Emissions-Eigenschaften von Phenanthro[1,10,9,8,o,p,q,r,a]perylen-7,14-dion (Kurze Mitt.)

Zusammenfassung Im Gegensatz zu bislang publizierten Daten zeigt Phenanthro[1,10,9,8,o,p,q,r,a]perylen-7,14-dion, das fundamentale chromophore System der Hypericintyp-Verbindungen, in aprotischen Lösungsmitteln wie Dimethylsulfoxid eine Absorption mit einer langwelligen Bande bei 423 nm (7000). In diesen Lösungsmitteln ist Fluoreszenz nicht nachweisbar. In protischen Lösungsmitteln wie Methanol wird die langwellige Bande bathochrom verschoben (546 nm) und bei 565 nm tritt Fluoreszenz auf. Dieses Verhalten wurde mit der Umkehr in der Reihenfolge vonn – * und – * Übergängen interpretiert. Die Daten wurden wegen der extremen Schwerlöslichkeit dieser Verbindung bislang nicht erhalten. Die Monoprotonierung im Grund- und Anregungszustand ist durchpK _a- undpK* _a -Werte von –6 und 2 charakterisiert; die Diprotonierung tritt beipK _a=–7 ein.

     

Conductance in isodielectric mixtures. III.i-butyronitrile with chlorobenzene,o-dichlorobenzene,p-dichlorobenzene, 1,2-dichloroethane,andn-pentanol

The conductance of tetrabutylammonium tetraphenylboride, picrate, perchlorate, and nitrate has been measured at 25°C in mixtures ofi-butyronitrile with chlorobenzene,o-dichlorobenzene,p-dicholorobenzene, 1,2-dichloroethane, andn-pentanol covering the range of dielectric constants 10D20. In these mixtures of polar solvents, both association constants and ionic mobilities depend on ion-solvent interaction energies and on free volume in a manner that is specific for each system. This failure of the primitive model (rigid charged spheres in a continuum) is shown to be the consequence of short-range spatial and energetic interactions between ions and adjacent solvent molecules.     

Excess volumes of 1,2-dichloroethane with acetone,chloroform, carbon tetrachloride, 1,4-dioxane,and tetrahydrofuran at 293.15 K

Excess volumes of mixtures of 1,2-dichloroethane with acetone, chloroform, carbon tetrachloride, 1,4-dioxane, and tetrahydrofuran have been measured at 293.15 K. The data have been analysed in the light of the cell model theory andFlory's theory.

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Überschuß-Volumina von 1,2-Dichlorethan mit Aceton, Chloroform, Tetrachlorkohlenstoff, 1,4-Dioxan und Tetrahydrofuran bei 239,15 K

Zusammenfassung Es wurden Überschuß-Volumina von Mischungen von 1,2-Dichlorethan mit Aceton, Chloroform, Tetrachlorkohlenstoff, 1,4-Dioxan und Tetrahydrofuran bei 239,15 K gemessen. Die Daten wurden im Licht der Zellenmodell-Theorie und der Theorie nachFlory analysiert.

     

[Boranato-bis(dimethylphosphonium-methylid)]-Komplexe der do- und d10-Metalle: Li,Be, Mg,Zn, Cd,Hg, Al und Ga

Dehydrohalogenation and metallation of boranato-bis-trimethylphosphonium salts (1), using two equivalents of a lithiumalkyl in tetrahydrofuran, leads to a solvated organolithium reagent H₂B[(CH₃)₂PCH₂]₂Li (3) which can be converted into a 1:1n1-complex with tetramethylethylenediamin (4).3 reacts with anhydrous metal(II) halides to form spirocyclic coordination compounds of the type H₂B[(CH₃)₂PCH₂]₂ M[CH₂P(CH₃)₂]₂BH₂ (5–9,M=Be, Mg, Zn, Cd, Hg). The reaction of [(CH₃)₃PBH₂P(CH₃)₃]Br (1) with lithium tetramethylmetalates Li[M(CH₃)₄],M=Al, Ga, on heating in the absence of a solvent affords the metallocycles H₂B[(CH₃)₂PCH₂]₂ M(CH₃)₂ (10, 11) with evolution of methane. The products can be sublimed from the reaction mixture. The proposed structures of the new compounds, with tetrahedrally coordinated central atoms and strong covalent metal-carbon interactions, are supported by mass, IR and¹H,⁷Li,¹¹B,¹³C, and³¹P NMR spectra. Compound9 represents a rare case of a tetracoordinate organomercurial, compound5 is the first nonionic tetraalkylberyllate.