四元羧酸稀土配合物的合成与表征

在水溶液中合成了铕和铽的四元羧酸稀土配合物。通过红外光谱,元素分析,热分析及荧光光谱,对其组成及其荧光性能进行了表征。结果表明两种稀土配合物具有较好的荧光性质。     

具有荧光响应的多元可聚合稀土配合物的研制

以氧化铕、邻菲啰啉、苯甲酸、丙烯腈为原料,合成了一种具有聚合反应活性的四元铕配合物。研究了氯化铕、邻菲啰啉、丙烯腈物质的量比对产品结构、发光性能、热稳定性以及产率的影响。采用红外光谱、荧光光谱、热失重对产物结构、发光性能、热稳定性进行了表征。结果表明:该铕配合物具有可聚合的能力以及良好的热稳定性。在波长为342nm紫外光激发下,能发射出强烈的,来自于Eu3+离子的特征红光,强度最大的发射峰在615nm。     

Eu3+-二苯甲酰甲烷、三苯基氧膦三元配合物的合成与荧光特性

含铕配合物在紫外光的激发下呈现出可见的较强红色特征荧光。以二苯甲酰甲烷和三苯基氧膦为混合配体,合成了Eu~(3+)-二苯甲酰甲烷、三苯基氧膦三元配合物(Eu(DBM)_3(TPPO)_2)。对配合物的合成进行了单因素实验,得到较好的合成工艺条件:以乙醇为溶剂,控制pH在6.5～7.0之间,反应时间为3小时,反应产率在78%以上,对配合物进行了氢谱、红外结构表征。配合物经紫外光谱、荧光光谱分析,表明配合物的紫外吸收特征峰出现在358 nm和274 nm;在398 nm紫外光激发下,配合物发射的波长615.4 nm特征光最强,荧光表现为红色。     

铕-香豆素-3-羧酸配合物的合成、表征及其荧光性质研究

以香豆素-3-羧酸为配体,在超声波辅助下,合成了两个铕-香豆素-3-羧酸配合物EuL3 NO3和EuL、C1、(L=香豆素-3-羧酸根阴离子),通过IR、1HNMR、13CNMR、MS和元素分析等表征手段,对配合物的结构和组成进行了表征,并对其荧光光谱性质进行了研究.结果表明,配体的羧酸、羰基基团均与铕离子配位;配合物...     

苯丙烯酸邻菲罗啉铕钇配合物的合成及荧光特性

在乙醇介质中，合成了标题化合物，测定了其组成，红外光谱及荧光光谱，结果表明，羧酸的羟基氧及邻菲罗啉中的氮原子均与稀土离子配位，铕钇配合物的荧光强度值高于铕配合物。     

一种新的铕配合物Eu(BTI)3DPPZ的合成及光致发光

合成并表征了可溶性双(硫代磷酰基)亚胺铕配合物Eu(BTI)3DPPZ,在挥发性溶剂中具有好的溶解性,TG表明它具有较高的热稳定性。在345nm的激发波长下,Eu(BTI)3DPPZ的最强发射波长在612nm,这是铕离子的特征发射谱线,归属于5D0→7F2。从发光强度来看,Eu(BTI)3DPPZ的光致发光产生了较强的红光。     

香豆素β-二酮、邻菲罗啉、铕三元配合物的合成及发光性能研究

通过3-乙酸乙酯香豆素与3-乙酰基香豆素的克莱森缩合反应。合成了香豆素β-二酮化合物,并与邻菲罗啉、铕（Ⅲ）反应合成了一种新型三元铕配合物,利用红外光谱、紫外光谱、元素分析对三元铕配合物的组成和结构进行了表征,用荧光光谱检测其荧光发光性能。     

三嗪三苯甲酸铕配合物的构筑、晶体结构及表征

本文在水热合成条件下,以醋酸铕,三嗪三苯甲酸为原料,合成了一种新型铕配位聚合[Eu(TATB)(H_2O)]_n,并通过X-射线单晶结构、红外光谱、荧光光谱进行了分析和表征。结构分析表明,此配合物属于单斜晶系,空间群为C2/c,晶胞参数a=2. 8637(4) nm,b=2. 2239(30) nm,c=2. 0397 nm,α=90°,β=134. 514°,γ=90°,V=9. 263(2) nm3,Z=8。配合物1中存在两个晶体学独立的铕离子,由两个处于八配位的四方反棱柱构型组成。荧光光谱分析表明,配合物1的发射光谱可归属为金属离子铕的特征发光。     

Eu(3+)-β-二酮、三正辛胺三元配合物的合成与光谱特性

合成了铕(Ⅲ)的二苯甲酰甲烷、三正辛胺的三元配合物Eu(3+·(DBM)3·[N(C8H(17))3]2，通过元素分析确定了配合物的组成，并通过红外光谱对配合物进行了表征。结合红外光谱、荧光光谱讨论了配合物的成键特性、配体传能机制以及协同配体N(C8H(17))3引入对激发光谱的影响。荧光光谱表明配合物可吸收247～400nm的宽带紫外光，发射Eu(3+)的5D0→7F2对应的612nm红色荧光。适于用作农膜转光剂。     

镧、钇掺杂铕-樟脑酸-1,10-菲咯啉三元配合物的合成及荧光性能

实验合成了单核铕-樟脑酸-1,10-菲咯啉三元配合物和La、Y掺杂异核铕-樟脑酸-1,10-菲咯啉三元配合物。通过配位滴定、元素分析和红外光谱等测试,确定其组成为RE2(CA)3(phen)2(RE为Eu、La和Y;CA为樟脑酸;phen为1,10-菲咯啉);通过三维荧光光谱图确定其最佳激发波长为330.0 nm,即在330.0 nm激发光下的发射光谱图中均显示出Eu3+离子5D0→7F0(579nm),5D0→7F1(594 nm)和5D0→7F2(612 nm)等三条特征谱线,其中5D0→7F2(612 nm)为最强跃迁峰。荧光强度变化研究表明,适量镧和钇离子的掺杂并没有降低铕离子的荧光强度,说明镧和钇对铕离子荧光发射有敏化作用。     

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.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。