1000 resultados para ND ALLOY


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用动力学方法测定了本体系不同温度下(30℃,40℃,50℃)的平均增长链寿命τ,活性增长链浓度[C*],催化剂效率ELCU和绝对增长速度常数kp等主要动力学参数;求算了本体系增长反应活化能Ep=57.4kJmol.研究结果表明:该体系催化活性低的主要原因是其绝对增长速度常数太低.

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对[μ-CF_3CO_2)_2Ln(μ-CF_3HCO_2)Al(i-Bu)_2·THFl_2(Ln=Nd,Y)配合物单晶结构的X-射线分析指出,配合物具有中心对称性,配位中心由两个稀土和两个Al离子组成,稀土由两个THF和6个TFA分子配位形成畸变的三盖三棱柱结构,Al由两个TFAG和两个i-Bu配位形成四面体结构。桥连Al与两个稀土的TFA分子的羧基发生歧化加氢,其碳原子由SP ̄2型转变为SP ̄3型.NMR研究表明,在THF溶液中,该配合物保持了它在单晶中的配位结构,所不同的是两个i-Bu在溶液中有两种异构形成,二者间为慢交换过程。

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合成了一种新型异核双金属离子对配合物[Mo(dtc)_4]·[Nd(dtc)_4],并通过X-射线衍射法和元素分析确定了其晶体结构和分子结构,在此基础上,经红外光潜分析确定了该配合物的谱学性质。

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报道了多核Nd-Al双金属配合物活性体对共轭双烯烃的溶液聚合。结果表明,适宜的振荡时间有利于提高活性体的催比活性;通过外加AlEt_3,验证了聚合体系的纯度和活性体的稳定性,溶剂类型对活性体催比活性和聚合物分子量影响较大,活性次序为甲苯≥环己烷>正己烷;对产物[η]的影响则相反:甲苯<<环己烷<正己烷.不同单体的定向聚合性能有差别,聚丁二烯的顺1,4含量较低,且易受反应条件的影响.

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报导一种“多功能Nd:YAG激光牙科治疗机”应用于临床,对龋齿、牙本质过敏、牙龈炎、牙周炎、冠周炎等口腔疾病的治疗,取得较满意的效果.

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LnCl3 (Ln = Nd, Er) reacts with K2C8H8 to yield the complex (C8H8)LnCl.2THF, which reacts with K(2,4-C7H11) (2,4-C7H11 = 2,4-dimethylpentadienyl) to form (C8H8)Ln(2,4-C7H11).THF. The compound (C8H8)Nd(2,4-C7H11).THF(1) crystallizes from the mixed solvent

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The reaction of lanthanide trichlorides with sodium tetrahydrofurfurylcyclopentadienyl in THF afforded bis(tetrahydrofurfurylcyclopentadienyl)lanthanide chloride complexes (C4H7OCH2C5H4),LnCl (Ln = Nd, Gd, Dy, Yb). All of the complexes were characterized

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A series of neutral eta6-C6Me6 complexes of lanthanide elements Ln(176-C6Me6)(AlCl4)3 . MeC6H5(Ln = Nd, Sm, Gd, Yb) has been prepared directly in good yields from the reaction of LnCl3, AlCl3 and C6Me6 in toluene. The complexes have been characte

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In the presence of 1,10-phenanthroline (phen), lanthanide chlorides LnCl3 reacted with cyclopentadienylsodium to give the novel complexes [Na.3phen]+[Ln(C5H5)3Cl]-.phen (Ln = La, Pr or Nd). In the praseodymium case, crystal structure analysis showed that

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The title complex, tris[2(eta5)-tert-butylcyclopentadi-enyl]-mu-chloro-1:2kappa2Cl-tris(tetrahydrofuran-1kappaO)lithiumneodymium, [Nd(C9H13)3(mu-Cl)Li(C4H8O)3], consists of the neutral moiety ((t)BuCp)3Nd linked to the cation [Li(thf)3]+ by a mu-Cl bridge

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Nd(OPr ̄i)_(3-n)Cl_n-AIR_3二元体系催化异成二烯聚合的研究蔡小平,龚志,王佛松,朱行浩(中国科学院长春应用化学研究所,长春130022)(吉林化学工业公司研究院,吉林132021)关键词聚异成二烯,二元钕催化剂,定向聚合,稀土催...

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合成了八-4-(四氢糠氧基)酞菁钕(Ⅲ)(A)、八-4-(β-萘氧基)酞菁钕(Ⅲ)(B)、八-4-(2,4-二叔戊基苯氧基)酞菁钕(Ⅲ)(C)和八-4-(2,4-二叔戊基苯氧基)酞菁镨(Ⅲ)(D)4种新的稀土(Nd、Pr)(Ⅲ)双酞菁衍生物,经元素分析、红外光谱、核磁共振谱表征.紫外可见光谱表明,它们在氯仿(10 ̄(-6)mol/L)溶液中以单分子形式存在.热重分析证明配合物的热稳定性:B>C~D>A.4种配合物成膜性好,Z型沉积形成的单层LB膜材料对氨气有响应,特别是八-4-(四氢糠氧基)酞菁钕(Ⅲ)的膜材料对氨气很敏感,可与铜酞菁LB膜气敏性相比.

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将MeCpNdCl2·2LiC1·nTHF和2摩尔t-BuLi于四氢呋喃和戊烷混合溶剂中反应,合成得到一种新的阴离子型配合物〔Li(DME)3〕〔(η5-MeCp)Nd(t-Bu)3〕,用元素分析,红外光谱等作了表征,配合物溶于苯乙烯,可单独引发苯乙烯本体聚合,得无规聚苯乙烯。

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报导一种新型的Nd:YAP激光眼科治疗机。应用于临床,对膜性白内障、青光眼等眼病的治疗取得较满意的治疗效果。

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关于η~6-芳烃过渡金属有机络合物催化烯烃聚合的研究已早有报道.但对于η~6-芳烃稀土络合物催化烯烃聚合的研究至今未见报道.我们在研究了(η~6-C_6H_6)Nd-(AlCl_4)_3-AlR_3催化异成二烯聚合的基础上,又考察了不同芳烃烯土络合物和几种AlR_3组成的催化剂对丁二烯聚合的催化活性. 1.原料及试剂:丁二烯和烷基铝均为聚合级.汽油分别经浓硫酸,氢氧化钠水溶