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1.
以N,N′-双(2-氨乙基)草酰胺合铜[Cu(oxen)]作为螯合剂,合成和表征了4个草酰胺桥联的异双核配合物[Cu(oxen)Mn(L)2](ClO4)2。oxen表示N,N′-双(2-氨乙基)草酰胺根阴离子;L分别为N,N,N′,N′-四甲基乙二胺(tmen)、1,3-丙二胺(tmd)、1,2-丙二胺(tme)和乙二胺(en)。测定了配合物[Cu(oxen)Mn(tmen)2](ClO4)2的变温磁化率(4~300K);其数值用最小二乘法和从自旋Hamiltonian算符(H=-2JS1·S2-DS2Z1)导出的磁方程拟合,求得交换积分J=-26.8cm-1,表明双核配合物中金属离子间存在反铁磁性超交换作用。实验还发现双核配合物的抑菌活性优于配体的抑菌活性。  相似文献   

2.
合成和表征了两种新的异双核配合物「Cu(oxen)Mn(L)2」(ClO4)2,oxen表示N,N‘-双(2-氨乙基)草酰胺根阴离子;L为N,N,N’,N‘0四甲基乙二胺和1,3-丙二胺;测定了配合物「Cu(oxen)Mn(tmen)2」(ClO4)2的变温磁化率(4-300K);其数值用最小二乘法和从自旋Hamiltonian算符H=-2JS1S2-DS21导出的磁方程拟合,求得交换积分J=-6  相似文献   

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在聚乙烯醇(PVA)存在下,耐尔蓝(NB)与铈钼、钪钼杂多酸络阴离子形成离子缔合物,其最大吸收均位于585nm,表观摩尔吸光度分别为εcw=3.52×106和εSc=3.59×10_5L·molˉ1·cmˉ1,铈和钪服从比耳定律的浓度范围分别为0~0.8μg/25ml和0~2.0μg/25ml,测定极限分别为1.3ngCe/ml(n=10)和3.0ngSc/ml(n=7),对于0.02μgCe/ml或0.04μgSc/ml测定的相对标准偏差分别为2.7%(n=9)和2.8%(n=10),离子缔合物的摩尔比分别为Ce:Mo:NB=1:6:4和Sc:Mo:NB=1:12:3。本法用于地质标样分析,结果满意。  相似文献   

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在隔离式电解槽中,用泡沫铅(SPb)作阴极,铂(Pt)作阳极,饮和甘汞电极(SCE)作参考电极,以CH3CN+C2H5OH+H2O_Bu4NBr为电解体系,对由煤沥青为原料制得的中国相沥青(MP)进行电解加氢研究,当c(CH3CN):c(C2HOH):c(H2O)=0.4:0.1:1(浓度比),c(Bu4NB4)=0.31mol/L,t=30C,p(MP)=50g/L,阴极电解电位为-2.4V时,  相似文献   

5.
用π-酸配体P(SR)Cl_2和P〔SR)_3(R=Et,Ph)与三核钴羰基硫簇合物Co_3(CO)_7(3-S)(-SCNCH_2CH_2S)在无水无氧条件下反应,得到4个一取代产物。根据产物的元素分析结果、IR和 ̄1HNMR谱以及与已知结构的三核钴羰基硫簇合物的比较,确认产物为P(SR)Cl_2及P(SR)_3取代了非桥基配位钴原子上的一个羰基而得到的一取代物。  相似文献   

6.
金振兴  张庆勋 《化学试剂》1997,19(2):114-116
用π-酸配体P(SR0Cl2和P(SR)3(R=Et,Ph)与三核钴羰基硫簇合物Co39CO)7(μ3-S)(μ-S-CNCH2CH2S0在无水无氧条件下反应,得到4个一取代产物。根据产物的元素分析结果,IR和^1HNMR谱以及与已知结构的三核钴羰基硫簇合物的比较,确认产物为P(SR0Cl23及P(SR03取代了非桥配位钴原子上的一个羰基而得到的一取代物。  相似文献   

7.
刘树祥  张建民 《化学试剂》1998,20(6):327-330
合成了组成了为MLB.nH2O(M=Mn(Ⅱ),Cu(Ⅱ),Zn(Ⅱ)和Cd(Ⅱ),n=1,M=Ni(Ⅱ),n=2,L=甲酰基甲酸缩氨基硫脲:B=1,10-菲罗啉)的5种三元配合物,测定了其元素组成,摩尔电导率和磁化率;用电子光谱和红外光谱表示表征,提出了它们的结构,研究了配体甲酰基甲酸缩氨基酸脲及其配合物的杀菌活性。  相似文献   

8.
烯丙基硅(氧)烷铂配合物硅氢加成催化剂的研究   总被引:12,自引:1,他引:11  
通式为(CH2 CHCH2) nSiR(4- n) ( n = 2 ,3 ,4 ;R= Me ,Ph) 的烯丙基硅烷以及1 ,3 二烯丙基 四甲基二硅氧烷(DATM) 经由Grignard 反应制备,它们再与氯铂酸反应制备出相应的标题配合物,这种配合物可用做硅氢加成催化剂。研究发现在氯丙烯与硅氯仿的加成反应中,TAS( n = 4) 、DMDA(n = 2 ,R= Me) 、MTA( n = 3 ,R= Me) 和DATM 的铂配合物的活性都比氯铂酸大。同时还讨论了几种铂配合物催化剂对含氢硅油与乙烯基硅橡胶的加成反应活性,发现不同催化剂的活性各不相同。  相似文献   

9.
合成了组成为MLB·nH2O[M=Mn(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)和Cd(Ⅱ),n=1;M=Ni(Ⅱ),n=2;L=甲酰基甲酸缩氨基硫脲;B=1,10-菲啉]的5种三元配合物。测定了其元素组成、摩尔电导率和磁化率;用电子光谱和红外光谱进行表征,提出了它们的结构。研究了配体甲酰基甲酸缩氨基硫脲及其配合物的杀菌活性。  相似文献   

10.
王芹珠  陈智 《化学试剂》1997,19(4):230-232
用硫脲,S-乙基异硫脲和胍与二烷基亚磷酸酯在四氯化碳的碱溶液中反应得到产率满意的磷酰化产物,它们的通式是:(RO)2PNHCNR′R″ONH和(RO)2PNHCOSEtNH2,其中:R=n-C4H9—,i-C4H9—,sec-C4H9—,n-C6H13—;R′=R″=H-,CH3CH2—。其中7种化合物未见文献报道。以上这些产物对金属离子的萃取作用,本文作了初步探索  相似文献   

11.
Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.  相似文献   

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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.  相似文献   

14.
2008~2009年世界塑料工业进展   总被引:4,自引:1,他引:3  
收集了2008年7月~2009年6月世界塑料工业的相关资料,介绍了2008~2009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、环氧树脂、不饱和聚酯树脂)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。  相似文献   

15.
It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.  相似文献   

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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.  相似文献   

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