N—甲基二苯胺—4—重氮盐制备及性质

甲基二苯胺４重氮盐制备及性质赵超曹维孝（北京大学化学与分子工程学院，北京１００８７１）关键词Ｎ甲基二苯胺４重氮盐，光热分解，阴图ＰＳ版１９９７年８月１８日收到初稿，１９９７年１１月１０日收到修改稿国家自然科学基金资助项目（批准号：...     

不对称五氮齿类卟啉金属配合物的合成,激发态性能研究及应用

不对称五氮齿类卟啉金属配合物的合成、激发态性能研究及应用博士研究生孙文芳导师王夺元，许慧君（学位授予单位中国科学院感光化学研究所，北京１００１０１）具有二维大π共轭体系有机分子的合成及其激发态性能的研究是近年来国内外非常活跃的研究领域，这是由于它们在...     

超声对多相光催化光解H2S作用的初步探讨

超声对多相光催化光解Ｈ２Ｓ作用的初步探讨王涵慧俞稼镛（中国科学院感光化学研究所,北京１００１０１）罗曾义（中国科学院声学研究所,北京１０００８０）关键词硫化氢,光解,超声作用１９９７年９月１５日收到初稿,１９９７年１２月２９日收到修改稿．通讯联系...     

罗丹明B在TiO2薄膜和P—25涂层催化下光反应的比较

罗丹明Ｂ在ＴｉＯ２薄膜和Ｐ２５涂层催化下光反应的比较马颖姚建年（中国科学院感光化学研究所，北京１００１０１）关键词ＴｉＯ２薄膜，罗丹明Ｂ，光降解１９９７年１２月２４日收到来稿，１９９８年１月２０日收到修改稿．国家自然科学基金项目（批准号：５...     

1,2,4-三氮唑席夫碱的配位模式及其金属配位结构研究

近年来,有关1,2,4-三氮唑席夫碱金属配合物的研究迅速突起,三氮唑席夫碱配合物由于其特殊的多功能配位结构和拓扑学结构特征以及独特的生理活性,使其无论是在抗细菌还是抗真菌方面都表现出优异的活性,因而备受关注。综述了1,2,4-三氮唑席夫碱金属配合物的最新研究进展,以晶体结构数据为主要依据,按单齿、双齿、三齿、四齿、五齿、六齿和八齿配位模式对各类1,2,4-三氮唑席夫碱金属配合物中配体的配位模式及其金属配位结构进行了综合评述,并对该类配合物今后的研究方向提出了建议和展望。     

滇西水泥厂预分解系统积料堵塞原因分析

１引言滇西水泥厂一、二期工程各为日产１０００ｔ熟料的五级旋风预热器带ＲＳＰ分解炉的预分解生产线，一期工程于１９９５年６月点火调试，１９９６年９月至１９９７年８月共生产熟料３００６９４ｔ，实现了年达产；二期工程于１９９７年３月２８日点火调试，１９９７年...     

《橡胶工业》《轮胎工业》关于量和单位及数字用法采用新标准规定的说明

《橡胶工业》《轮胎工业》关于量和单位及数字用法采用新标准规定的说明《橡胶工业》《轮胎工业》编辑部１９９７年６月８～１４日，中国化工信息中心在北京组织举办了“化工科技期刊主编培训班”。受编辑部指派，《橡胶工业》《轮胎工业》黄丽萍、许炳才两位副主编参加...     

含镍配合物的合成、表征及其对尿素水解的影响

报道了对称六齿配体N,N,N′,N′, 四(2′ 苯并咪唑甲基)乙二胺(EDTB)的一种含镍(II)配合物[Ni(EDTB)·C6H5COO(OH)]·ClO4·CH3CH2OH·H2O的合成、表征及其对尿素水解的影响。根据配合物元素分析、摩尔电导、紫外 可见、红外、ESR谱和循环伏安(CV)等性质,与已测X 射线单晶结构的同种配体含铜(Ⅱ)单核配合物比较,推测此配合物中的Ni(Ⅱ)离子被配体EDTB的4个苯并咪唑氮和1个烷胺氮与水杨酸根的1个羧基氧配位,形成一种畸变八面体几何构型,并用气相色谱法观测了此配合物对尿素水解的影响,结果表明,它具有催化尿素水解的活性。     

1～6月我行业进出口情况

据《化工产品进出口信息》报道，１９９９年１～６月橡胶及其制品进出口情况如下：名　称数量进　口同比增长，％金额万美元同比增长，％橡胶及制品４６．４８１５．１９５５７９４３２．９０胶鞋类６０－１４．２９９２－２０．００名　称数量出　口同比增长，％金额万美元同比增长，％橡胶及制品４８．３２１２．７９４１６２４７．８３胶鞋类１０７４２０５．０２１６２０３７－１１．５１　　注：制品以万吨计，鞋以万双计。1～6月我行业进出口情况@荆方     

不对称五氮齿镉和铟大环配合物的激发态性能研究

本文研究了不对称五氮齿镉和铟大环配合的的激发态性能及其光稳定性。结果表明：它们的三重态能量在１２０ｋＪ／ｍｏｌ左右,最低激发三重态敏化产生单重态氧的量子产率在０．６￣０．９,它们的分子一阶超极化率在￣１０＾－２８ｅｓｕ,在光照的条件下,配合物Ⅰ相当稳定,而配合Ⅱ则形成不稳定化合物导致光褪色。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.     

Highly moisture-proof polysilsesquioxane coating prepared via facile sol-gel process

A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by ¹H MAS NMR. For direct comparison purposes, an SiO₂ coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N₂ absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals.