亚苄基丙酮水杨酰腙Co(II)、Ni(II)配合物的合成、晶体结构及热重分析

采用亚苄基丙酮水杨酰腙配体(HL)分别与Co(NO3)2、Ni(NO3)2溶液进行反应,得到两个配合物Co(LPy)2(1)、Ni(LPy)2(2),并通过FTIR、热分析、X射线单晶衍射和X射线粉末衍射手段对其进行了表征。X射线单晶衍射结果表明,两个配合物均为扭曲四角双锥构型,属三斜晶系。配合物1属于P-1空间群,晶胞参数为a=1.034 7(3)nm,b=1.405 2(4)nm,c=1.454 1(4)nm;α=92.830(4)°,β=109.054(3)°,γ=96.091(4)°,V=1.979 2(10)nm3,Z=2,F(000)=814,R1=0.050 6。配合物2属于P-1空间群,晶胞参数为a=1.043 5(5)nm,b=1.394 0(7)nm,c=1.454 2(7)nm;α=92.41(2)°,β=109.73(2)°,γ=95.80(2)°,V=1.974 5(17)nm3,Z=2,F(000)=816,R1=0.043 8。热失重分析表明,配合物1、2的晶体结构在低于200℃下是稳定的。     

4,4’-联吡啶Ni(Ⅱ)配合物的合成、晶体结构及热稳定性

以4,4’-联吡啶(bipy)和1,2,4,5-苯四甲酸(H4BTA)为配体与金属盐Ni Cl2·6H2O合成出配合物一个Ni(II)的配合物晶体{[Ni(bipy)(H2O)4]·6H2O·H4BTA}n,对其进行了元素分析、X射线单晶衍射、红外光谱、热重分析和X射线粉末衍射等手段进行了表征。X射线单晶衍射结果表明此配合物属于单斜晶系,C2/c空间群,晶胞参数a=1.993 6(3),b=1.130 04(2),c=1.538 5(2),α=90.00°,β=94.513(4)°,γ=90.00°,V=3.455 4(9)nm3,Z=8。热重分析结果表明其具有较好的稳定性。     

4,4’-联吡啶Ni(Ⅱ)配合物的合成、晶体结构及热稳定性

以4,4’-联吡啶(bipy)和1,2,4,5-苯四甲酸(H4BTA)为配体与金属盐Ni Cl2·6H2O合成出配合物一个Ni(II)的配合物晶体{[Ni(bipy)(H2O)4]·6H2O·H4BTA}n,对其进行了元素分析、X射线单晶衍射、红外光谱、热重分析和X射线粉末衍射等手段进行了表征。X射线单晶衍射结果表明此配合物属于单斜晶系,C2/c空间群,晶胞参数a=1.993 6(3),b=1.130 04(2),c=1.538 5(2),α=90.00°,β=94.513(4)°,γ=90.00°,V=3.455 4(9)nm3,Z=8。热重分析结果表明其具有较好的稳定性。     

(E)-3-(2,4-二氯苯基)丙烯酸和1,10-邻菲啰啉构筑的钴(Ⅱ)配合物的合成及晶体结构

采用水热合成的方法合成了一个新的1,10-邻菲啰啉钴(Ⅱ)配合物,其分子式为:C39H23Cl6Co1.50N2O6.50。经元素分析、红外光谱及X-射线单晶衍射对其结构进行了分析。该配合物属于三斜晶系,p-1空间群,晶胞参数:a=11.134(2)?,b=11.976(3)?,c=15.103(3)?,α=80.847(4)°,β=74.615(3)°,γ=83.221(3)°,V=1910.7(7)?3,Z=2,R1=0.0732,w R2=0.0976。     

[Ni(phen)_2·Co(phen)_2·2Co(DPC)_2·4H_2O]·13H_2O双金属配合物的合成及其晶体结构

采用水热法成功合成了一种结构新颖的二维层状钴镍双金属配合物[Ni(phen)2·Co(phen)2·2Co(DPC)2·4H2O]·13H2O(phen=1,10-菲啰啉,DPC=2,6-吡啶二羧酸),采用单晶X射线衍射对其结构进行了表征。结果表明该配合物属于三斜晶系、P1空间群,其晶胞参数为:Mr=1922.98,a=10.0585(18)nm,b=14.684(3)nm,c=14.931(3)nm,α=74.078(6)°,β=78.399(6)°,γ=75.279(6)°,V=2030.5(7)nm3,Z=1。     

一维链状锌配位聚合物[Zn(4,4′-bipy)(H_2O)_4]_n·(Paba)_(2n)的合成及其结构表征

在水和乙醇的混合溶剂中合成了一维链状配合物[Zn(4,4′-bipy)(H2O)4]n·(Paba)2n(1)(4,4′-bipy=4,4′-联吡啶,PabaH=对氨基苯磺酸),并通过元素分析、IR和X-射线单晶衍射对其结构进行了表征。单晶衍射结果表明,配合物1属于单斜晶系,P2(1)/c空间群,晶胞参数:a=1.1273(4)nm,b=0.8306(3)nm,c=1.4380(5)nm,β=90.430(4)°,V=1.3464(8)nm-3,Z=2,Dc=1.574g.cm-3,μ=1.129mm-1,F(000)=660,R1=0.0382,wR2=0.0954,S=1.048。     

三氟乙酰苯乙酮Cu(Ⅱ)配合物的合成和晶体结构

文章主要研究三氟乙酰苯乙酮和过渡金属Cu(Ⅱ)配合物Cu(C10H6F3O2)2的结构特征。实验过程采用Cu(NO3)2,三氟乙酰苯乙酮,按物质量比1∶2混合,用NaOH溶液调节pH,通过水热法得到配合物Cu(C10H6F3O2)2的单晶,最终通过X-射线单晶衍射测定了晶体结构,该化合物属于单斜晶系,P2/n空间群,晶胞参数为:a=1.0351(5)nm,b=0.56473(7)nm,c=1.6978(2)nm,α=90°,β=90.012(8)°,γ=90°,V=9.9086(5)nm3,Z=4。     

配合物[Cd(na)2(phen)2]·[Cd(na)2(phen)2]·3H2O的合成、晶体结构及荧光性质

用硝酸镉与1-萘甲酸、邻菲罗啉水热合成了配合物[Cd(na)2(phen)2]·[Cd(na)2(phen)2]·3H2O (Hna=1-萘甲酸,phen=1,10-邻菲罗啉),并用X-射线单晶衍射、红外、热重和元素分析进行了结构表征.结果表明,该配合物属三斜晶系,P-1空间群,晶胞参数为:a=1.27123(16) nm,b=1.6369(4) nm,c=1.9656(2)nm,α=75.613(2)°,β=84.363(2)°,γ=71.5380(10)°,Z=2,V=3.7572(8) nm3.配合物包含两个离散的单核[Cd(na)2(phen)2]子单元和三个结晶水分子,并通过分子间氢键形成三维超分子结构.在335 nm的紫外光激发下,配合物发射出源于Na-之间电子跃迁的荧光.     

以5-甲基间苯二甲酸为配体的双核Cu(Ⅱ)配合物的合成、晶体结构及磁性

采用水热法合成了双核Cu(Ⅱ)配合物[Cu2(C9 H6O4)2(C5 H5N)4·H2O].通过元素分析、红外光谱和X-射线单晶衍射对配合物进行了表征.结果表明,配合物属单斜晶系,C2/c空闻群,晶胞参数:a=1.8454620(17)nm,6=0.87957(8)nm,c=2.2995(3)nm,β=108.462...     

三维配合物Zn(HDTIM)·1.5H_2O的合成、晶体结构及性质

以4,5-二氰基咪唑(HIMDN)为原配体运用不同的方法设计合成了三维配合物Zn(HDTIM).1.5H2O(HDTIM=4,5-di(1H-tetrazol-5-yl)-2H-imidazole),利用元素分析,X-射线单晶衍射,粉末衍射以及热重分析等手段对标题化合物进行了表征,配合物属于正交晶系,P212121空间群,晶胞参数:a=0.8643(6)nm,b=0.8885(6)nm,c=1.5450(10)nm,α=β=γ=90(1)°,结果表明配合物1在较高温度下具有良好的热稳定性。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

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.     

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.     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。