稀土烯丙基化合物的研究(VII)——镧、铈、镨、钕和钐的2-甲基烯丙基化合物的合成

用无水稀土氯化物与2-甲基烯丙基氯化镁及四甲基乙二胺(tmed),在四氢呋喃中反应,合成了五个对空气和湿气相当敏感的轻稀土元素2-甲基烯丙基化合物Ln(C_4H_7)_2Cl_5Mg_2(tmed)_2[Ln=La,Ce,Pr,Nd和Sm].化合物均经元素分析、红外光谱及质谱的鉴定,并进行了摩尔电导的测定.     

氨基膦和氨基烷基膦的抗磨极压性能及作用机理

合成了P-N型化合物氨基膦(Ⅰ)及氨基烷基膦(Ⅱ)。油溶性好。经四球试验机考察,其抗磨极压性能为:当在750SN中性油中加入1～1.6(wt%)时,四球机上的磨斑直径d_(30)~(60)=0.4～0.5。Ⅱ比Ⅰ具有更好的抗磨、耐负荷性及抗烧结性。通过差热分析和俄歇电子能谱分析对添加剂的作用机理进行了探讨。与Ⅰ相比较,Ⅱ的分子使活性元素P、S更容易进入摩擦表面,促进表面膜的形成和稳定。     

乙烯—醋酸乙烯酯(EVA)共聚物组成及结构分析

利用 FT-IR、NMR 对 EVA 的组成、序列结构进行分析,结果准确度高,分析过程方便、快速。     

1-苯基-3-甲基-4-三氟乙酰基吡唑酮-(5)与Nd(III),Eu(III),Yb(III)的萃取平衡及络合物的合成和性质

在30℃及0.5mol·L(-1)NaNO_6条件下,测定了Nd(III),Eu(III),Yb((III)与1-苯基-3-甲基-4-三氟乙酰基吡唑酮-(5)(PMTFP)氯仿溶液体系的萃取平衡常数及萃合物的组成。用萃取法合成了Nd(III),Eu(III),Yb(III)与PMTFP的固体络合物,分析了它的组成,并通过它们的红外光谱和紫外光谱,探讨了络合物的结构。     

3D-quantitative structure-activity relationship study of organophosphate compounds

The biological effects of most organophosphate compounds (OP) are arising by inhibition of the enzyme acetylcholinesterase (ACHE). The 3D-quantitative structure-activity relationship (3D-QSAR) on the acute toxicity to housefly (Musca nobulo L.) of 35 dialkyl phenyl phosphate compounds are studied by using comparative molecular field analysis (CoMFA) and comparative molecular similarity index analysis (CoMSIA) methods, and the reaction mechanism between the OP and the AChE are discussed. In contrast to classical QSAR methods, CoMFA and CoMSIA, especially the combination of both approaches, can give more comprehensive and accurate perspectives on the mechanism of the reaction between OP and ACHE. The results show that the length of alkyl, and the electronegative of substituent on phenyl of OP have significant effects on the AChE activity,whereas, the hydrophobicity of OP has little influence. The steric and electronic properties of OP have a dominant influence on the reaction between OP and ACHE.     

空间效应对有机物性质的影响

有机物分子中原子之间的相互作用主要有电子效应和空间效应．有时空间效应对有机物的性质影响是较大的，可决定有机物的某些性质.     

Structures of rare earth-transition metal rich compounds derived from CaCu5 type

The properties of materials have a close connect ion to their crystal structures. Rare earth (R)-transition metal (T) rich compo und are the focus of investigation in the search for new hard magnetic materials . As the basis for the study of stabilized effect of the third component on the fo rmation of RT5 derivative and its influence of the occupied sites on magnetic properties, in this paper, the possible derivative compounds based on the RT5 primitive unit cell of the CaCu5 structure type formed through the ordered or disordered substitution of dumbbell pair 2T atoms for the R atoms at some sit es, and the structural relationship between the derivatives and the prototype ar e summarized.     

全芳香族共聚酯——聚合物的合成及表征

本文用熔融缩聚法合成了a,b两系列全芳香族共聚酯液晶。用元素分析、红外光谱及裂解气相色谱法研究了共聚芳酯高分子链段结构。实验结果表明,共聚芳酯的分子链段组成、配比与加入的初始单体配比一致。     

间-二硝基苯精制的理论与实践

对芳环上硝基进行亲核置换的反应性作了理论分析,提出了在季铵盐相转移催化剂存在下,使用稀的氢氧化钠溶液精制间-二硝基苯的新方法。收率达97.25%。比亚硫酸钠法提高4%。两法的产品经气相色谱及红外光谱分析,证明质量相同。反应生成的邻硝基苯酚可以回收。废液色浅,COD_(Cr)值下降10倍。     

几种MOCVD用挥发性β-二酮类金属螯合物的合成及初步研究

以丙酮为初级原科,逐步合成频那酮。三甲基乙酸,最后合成了β-二铜螯合剂DPM,红外光谱鉴定表明合成是成功的。以β-二酮类螯合剂AA,DPM,TFAA,及FOD与Y,Ba,Cu,Zr等中心原子合成了它们的螯合物。热重分析表明,螯合物的挥发性同配体的空间位阻及F代原子数目有关,配体的空间位阻越大,F代原子数目越多,则螯合物的挥发性越好;同时与中心原子的离子半经密切相关,中心原子的离子半经越小,则螯合物的挥发性越好。此外,对几种螯合物进行了质谱研究,以推测它们在plasma-MOCVD过程中的可能行为。