查询词典 ligand

The experiment results indicate that higher phase splitting speed and extraction factor can be achieved when low-carbon alcohols such as n-butanol are used as organic solvents; by using five different N-carbobenzyloxy-L-amino acids as chiral ligands that are formated with Cu(superscript 2+) or Ni(superscript 2+), it is found that as a ligand, Z-Phe has a low extraction factor, while Z-Hyp, Z-Pro, Z-Glu, Z-Val have higher extraction factors, and among these, Z-Val has the highest distribution coefficient; pH value of extractant, when near to the PI of phenylalanine, helps to improve extraction resolution effect; temperature has no obvious effect on the resolution result.

结果表明：以低碳醇类正丁醇作有机稀释剂，所用5种N-苄氧羰基氨基酸（分别为Z-Phe、Z-Hyp、Z-Pro、Z-Glu、Z-Val）与Cu(上标 2+)或Ni(上标 2+)形成手性配位体后，以Z-Val作手性配体，萃取相pH值接近苯丙氨酸等电点时，萃取拆分效果最佳。

Near-infrared fluorescence of Yb was further enhanced while the visible fluorescence from Yb-Calcein was quenched when second ligand, such as tributyl phosphate, 1,10-Phenanthroline and trioctyl phosphine oxide, was added.

第二配体TBP，Phen，TOPO的加入，可进一步提高Yb~(3+)-钙黄绿素体系的近红外发光效率，但同时也会猝灭Yb~(3+)-钙黄绿素体系的可见区荧光。

Firstly, synthetic racemates of β- amino acids were resolved into their enantiomers by ehiral ligand - exchange flash chromatography with L - hydroxyproline chemically bonded to irregular silica as the stationary phase and aqueous solution containing cupric ions as the mo

首先合成L-羟脯氨酸硅胶键合手性固定相，用于快速色谱中3-羟基-4-甲氧基-β-苯丙氨酸对映体的制备分离，考察了流动相中Cu^2＋浓度、样品体积等因素对分离的影响。

Solid complexes of rare earth picrates with the ligand 2,6-bis(benzimidazol-2-yl)pyridine have been synthesized and characterized by elemental analysis, IR and electronic spectra. The crystal and molecular structures of the complex [CeL22]·(CH3OH)3 have been determined by single crystal X-ray diffraction.

合成了稀土苦味酸盐与配体2，6-二(2-苯并咪唑基)吡啶的配合物，通过元素分析、红外光谱及电子光谱对配体及配合物进行了表征，并用X射线单晶衍射测定了配合物[CeL22]·(CH3OH)3的晶体结构。

Treatment of phosphines with [Ir2Cl] resulted the formation of the products with the phosphine ligand trans to the carbene moiety via substitution of CO.

当膦化物与上述的 [I2Cl]反应时，膦化物会取代反式位置上的CO取代基而形成[Ir(PR3)Cl]。

The coordinated COD of 3 and 4 can be replaced by carbon monoxide to yield the corresponding dicarbonyl species [(C,N-pyN^C-R) M2]BF4 (14, M= Rh; 15, M= Ir). Ligand substitution of 11a by phosphines and azide causes the de-complexation of pyridinyl-nitrogen donor to generate the corresponding carbene rhodium complexes [(C-pyN^C-Mes)RhPR3] (17a, R = Ph, 17b, R = Et) and [RhN3] (19), respectively, indicating the labile nature of steric-hindered pyridinyl-nitrogen donor.

螯合错合物的吡啶配位，可以容易被σ-予体，如卤离子、叠氮阴离子、膦试剂，置换；但是铑与铱金属螫合物与π-酸试剂，如一氧化碳、异腈，则发生COD被置的产物14a与16；与三甲基亚磷酸酯反应时，COD及吡啶均会被取代而得到单芽的三铑-碳烯错合物18；双膦化合物则会取代铑金属上全部的配位基。

Glutamine-binding protein is one of the ligand-specific periplasmic binding proteins in the Escherichia coli permease systems, predicted to play an important role in transferring Gln from the pe-riplasmic space to the cytoplasmic space.

谷氨酰胺结合蛋白(Glutamine-binding protein， GlnBp)是大肠杆菌透性酶系统中一个细胞外液底物专一性结合蛋白，对于细胞外液中谷氨酰胺的运输和传递至关重要。

Employing high-dilute method and 5-fold excess amine prepared two new "two-armed" acyclic diamine intermediates I_a and I_b, which are also intermediates of synthesizing microcyclic compounds, and eight aromatic Schiff bases, II_, were synthesized from reaction of I_a or I_b condensing with different aromatic aldehydes. Their composition and structure were characterized by Elemental analysis, IR, UV-Vis, LIF,~1HNMR and MS. The hydrogen bond interactions and MS fragmental patterns were also discussed.3. Several novel transition metal complexes using II_a as ligand were synthesized and identified by Elemental analysis, IR, UV-Vis,~1HNMR and molar conductivity.

1，采用高度稀释及胺过量五倍的方法合成了两个具有吡啶双酰胺臂的非环二胺Ⅰ_a和Ⅰ_b，并以它们为中间体进一步合成了八个芳香席夫碱Ⅱ_a-Ⅱ_h，通过元素分析及各种波谱测试鉴定了它们的组成与结构，对化合物的UV-Vis、LIF、IR、~1HNMR及MS进行了较为详细的讨论，还探讨了席夫碱的氢键相互作用及质谱裂解方式； 2，以席夫碱Ⅱ_a为配体合成了几个新型的过渡金属配合物，并通过元素分析、UV-Vis、IR、~1HNMR、摩尔电导及DTA—TG对其进行了表征，讨论了化合物的配位情况及配体在配位中的脱质子行为。

The central 5, 5'-disubstituted bipyridine units of each ligand coordinate theNi or Fe ion, while all the terminal 6-monosubstituted bipyridine units of the ligands keep free of coordination, as the result trinuclear triple-stranded helicate 〓 can not form. This is considered to be caused by the steric hindrance of the methylene substituents α to the chelating nitrogens of the terminal bipyridine units and the strain caused by linkage mode.

配体L〓与Ag作用得到〓，两个配体链相互缠绕着两个Ag离子周围形成双股螺旋结构并以头尾式排列(见图3)，由于配体中位于配位N原子α或β位的末端甲基或次甲基取代基的空间位阻阻碍了头对头式异构体的形成，也正是由于配体头尾式排列而使Ag双股螺旋得以形成，这一结果表明该螺旋体的组装过程中自发地采取了空间阻碍尽可能小的那个构型。

Sodium tungstate ; cyclohexene ; catalytic oxidation ; adipic acid ; acidic ligand ; reaction kinetics

钨酸钠；环己烯；催化氧化；己二酸；酸性配体；反应动力学

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了