一种新型钇(Ⅲ)希夫碱配合物的合成、晶体结构及荧光性质

以水杨醛苯甲酰腙为配体(H2L),采用溶剂热法,合成了钇(Ⅲ)配合物Y4(HL)8O2·8(H2O)。通过红外光谱、热重分析、元素分析、紫外及荧光光谱对其进行了表征,并用X-单晶衍射测定了钇(Ⅲ)配合物的结构。其结构以四个对称的金属核为骨架,每个金属核上带有两个配体,属于四方晶系,P4/ncc空间群,a=2.1656(2)nm,b=2.1656(2)nm,c=2.6668(4)nm,α=90°,β=90°,γ=90°,V=12.507(3)nm3,Z=16。荧光光谱分析表明:钇(Ⅲ)配合物在473nm处有强蓝色荧光发射,色坐标为(0.153,0.276)。其光致发光性能较好,有望在蓝色光学材料方面得到应用。     

新型铱配合物[Ir(dmpq)_2(Br_2bpy)]~+PF~-_6的合成、晶体结构及光物理性能测试

以喹啉类化合物为环金属配体,4,4′-二溴-2,2′-联吡啶为辅助配体成功合成出了一种新型离子型环金属铱配合物:[Ir(dmpq)_2(Br_2bpy)]~+PF~-_6(dmpq=2-(3,5-二甲苯基)喹啉,Br_2bpy=4,4′-二溴-2,2′-联吡啶)。配合物的结构通过元素分析、核磁共振谱、红外光谱、质谱进行了表征,并测试了单晶结构。并通过紫外-可见吸收、荧光光谱,对配合物的激发态进行了讨论,同时考察了配合物的热稳定性。结果表明配合物为单斜晶系、空间群为P2_1/n;配合物在溶液状态下为红光发射,最大发射波长为649 nm。     

2,2,2-胺三乙酰二苄胺及其稀土配合物的合成、表征与荧光性质

为研究三脚架型配体稀土配合物的组成、可能的配位状态及荧光性质,合成了三脚架型配体--2,2,2-胺三乙酰二苄胺(L)及其6个稀土配合物.通过红外光谱、核磁共振波谱、元素分析、差热-热重分析、摩尔电导率及荧光光谱等方法对L及其稀土配合物的组成及性质进行了表征.结果表明, L能够与稀土离子配位,生成n(RE)∶n(L)=1∶1的配合物;Tb(Ⅲ)配合物在紫外光激发下,在490nm、545nm、590nm、620nm附近出现强度不同的Tb3+特征荧光发射峰,分别归属于Tb3+的5D4→7F6、5D4 →7F5、5D4→7F4、5D4→7F3能级跃迁;而其Eu(Ⅲ)配合物的荧光发射微弱,其它配合物没有荧光发射.说明L的三重态能量与Tb3+最低激发态能级匹配较好,能起到较好的敏化作用,提高Tb3+的发光强度.     

查耳酮-4-氯苯甲酰腙铜(Ⅱ)配合物的水热合成、表征及抑菌活性

由查耳酮和4-氯苯甲酰肼反应得到查耳酮-4-氯苯甲酰腙(H2L),以该酰腙为配体,水热合成制得一个新的配合物查耳酮-4-氯苯甲酰腙吡啶铜(Ⅱ)(CuL2Py)(CCDC∶844451),并通过元素分析、红外光谱和X射线单晶衍射对其结构进行了表征。该配合物属单斜晶系,空间群为P2(1),晶胞参数a=0.8637(2)nm,b=1.5790(4)nm,c=1.6186(4)nm,β=102.227(4)°,V=2.1573(9)nm3,Z=2,μ=0.675mm-1,Dc=1.327mg/m3,F(000)=890。热重分析表明配合物在130.11℃以下时很稳定。抑菌实验结果显示配体及配合物对金黄色葡萄球菌、大肠杆菌和绿脓杆菌均有一定的抑菌效果,其中配合物比配体的抑菌活性强。     

新型酰腙类Cu(Ⅱ)配合物的合成、晶体结构及荧光性质

由5-溴-2-羟基苯基乙酮与2-羟基苯甲酰肼在乙醇溶剂中反应得到5-溴-2-羟基苯基乙酮-2-羟基苯甲酰腙。以该酰腙、吡啶和氯化铜水热合成配合物(C15H11N2O3Br)Cu(C5H5N)。通过元素分析和X射线单晶衍射对其进行了表征,结果表明,配合物属单斜晶系,P21/c空间群,晶胞参数a=0.98929(19)nm,b=2.4177(5)nm,c=0.78755(16)nm,β=97.285(4)°,V=1.8685(6)nm3,Dc=1.745mg/m3,F(000)=984。荧光光谱表明,配体和配合物均具有荧光性,配合物在360.0～410.0nm处的荧光强度得到了增强。     

铕、铽-α(β)-萘酸-邻菲啰啉三元配合物的合成及性质研究

分别以α-萘甲酸(α-HNMA)、β-萘甲酸(β-HNMA)、α-萘乙酸(α-HNAA)、β-萘乙酸(β-HNAA)为第一配体,1,10-邻菲啰啉(phen)为第二配体,合成了4种Eu(III)和4种Tb(III)的三元配合物。通过元素分析、配位滴定确定了各配合物的组成。通过红外光谱对配合物的结构进行了初步表征,发现各配体的特征吸收峰(νC=O、νC=N)在形成配合物后不同程度地向低波数方向移动,说明配合物中羧基氧原子和邻菲啰啉中的氮原子均参与了配位?捎肨G-DTG技术对8种配合物的热分解过程进行了研究,8种配合物均有较好的热稳定性。室温下测得了各配合物粉末的激发和发射光谱,结果表明,4种铕的三元配合物均发出红色荧光,最强发射峰613 nm附近的强度顺序为:Eu(β-NMA)3phen>Eu(α-NMA)3phen.H2O>Eu(α-NAA)3phen>Eu(β-NAA)3phen.H2O。4种铽的三元配合物无明显的荧光现象。     

一种新型红光铱(Ⅲ)配合物的合成、结构及光物理性能

以5-(4-氟苯基)-1,3-二甲基-1H-1,2,4-三唑(fdpt)为环金属主配体，4,4,4-三氟-1-(吡啶-3-基)-1,3-丁二酮(trifbutd)为辅助配体合成了一种铱(Ⅲ)配合物Ir(fdpt)₂(trifbutd)。采用元素分析、红外光谱、核磁共振谱分析和单晶X衍射对其化学组成及晶体结构进行了表征。采用紫外-可见光谱和光致发光荧光光谱对其光物理性质进行了分析。结果表明，该配合物化学组成为C₂₉H₂₃F₅IrN₇O₂,属于单斜晶系，P2₁/n空间群。晶胞参数为a=1.17369 (10) nm,b=1.68602(14) nm,c=1.42919(12)nm,β=90.925 (3)°,V=2.8278(4)nm³,Z=4。光物理性质显示最大发射波长为620 nm,为红色发射。     

2,2-联吡啶-6,6-二羧酸与稀土配合物的合成及性能

利用2,2-联吡啶-6,6-二羧酸作为配体,合成了稀土配合物[Ln2(bpydc)3·3H2O]·H2O·3CH3OH(1,Ln=Eu,Tb,Yb,Gd;Hbpydc=2,2-联吡啶-6,6-二羧酸)。使用单晶X射线衍射仪、傅里叶红外光谱、紫外吸收光谱、荧光光谱以及磷光光谱等对其进行了表征和配体与发光中心的能级匹配程度的测定,探讨了配合物的荧光性能与能量传递效率。结果表明:配合物具有两种不同环境的配位中心,促使配合物在空间上具有层状堆积结构;Eu(Ⅲ)与Tb(Ⅲ)配合物分别在612与548nm处有强烈的红色与绿色荧光发射,特征荧光敏化效果明显;配体三重态能级26666cm-1与稀土离子Eu3+(5D0,17300cm-1)、Tb3+(5D4,20500cm-1)最低激发态能级匹配,存在明显天线效应,具有优良的能量传递效率。     

2,2,2-胺三乙酰-吡啶及其稀土配合物的合成、表征与荧光性质

为了研究三脚架型配体与其稀土配合物荧光性质的关系,合成了三脚架型配体--2,2,2-胺三乙酰-吡啶及其6种稀土配合物.通过元素分析、摩尔电导、红外光谱、核磁共振波谱、差热-热重分析和荧光光谱等分析手段对配体及其稀土配合物的组成、性质进行了表征.结果表明,配合物的组成为Re(NO3)3·L·6H2O(Re=Ce3 ,Sm3 ,La3 ,Tb3 ,Y3 ,Eu3 );在DMF中属于2:1型电解质,其中,配合物中既存在以单齿形式与中心离子配位的NO-3,也存在游离的NO-3.荧光光谱分析表明,Tb(Ⅲ)配合物具有较强的Tb3 特征线状荧光,说明T(L)→5D4(Tb)的能级较匹配,从而使Tb3 荧光发射大大增强.同时,研究了溶剂中荧光增强效应,说明在极性较强、中性体系中配体对Tb3 的敏化作用较强.     

2-(2-羟基苯基)苯并噻唑-十一烯酸-锌与苯乙烯共聚物制备及性能研究

采用先配合再聚合的技术路线,先以Zn2+为中心离子,2-(2-羟基苯基)苯并噻唑为第一配体、10-十一烯酸为活性配体合成了反应型锌配合物2-(2-羟基苯基)苯并噻唑-十一烯酸-锌[Zn(BTZ)(UA)];再采用溶液聚合法,将Zn(BTZ)(UA)与苯乙烯共聚制备了聚苯乙烯-2-(2-羟基苯基)苯并噻唑-十一烯酸-锌[St-co-Zn(BTZ)(UA)]。通过红外光谱、紫外光谱、荧光光谱和热重分析对配合物和聚合物的结构和发光性能进行了表征。红外和紫外光谱表明,共聚物不仅表现出了聚苯乙烯的吸收,也表现出了配合物的吸收;荧光光谱表明,配合物在395nm的激发波长下发射蓝绿光,发射峰位于471nm处;聚合物在395nm的激发波长下,发射蓝光,发射峰位于451nm处,色坐标为(0.145,0.139),位于蓝光区;热重分析显示,聚合物的热分解温度为273℃,可用于三基色白光LED荧光粉的蓝光成分。     

p,V, T and derived thermodynamic data for toluene,trichloromethane, dichloromethane,acetonitrile, aniline,and n-dodecane

Experimentally determined p,V,T data are reported for toluene, trichloromethane, dichloromethane, acetonitrile, aniline, and n-dodecane at 278, 288, 298, 313, and 323 K, except for dichloromethane, for which the highest temperature was 298 K. At each temperature, measurements were done at pressures up to about 280 MPa or (for aniline and n-dodecane) at a lower pressure slightly below the freezing pressure at the temperature of measurement. Values of the isobaric expansivity isothermal compressibility and (for toluene, trichloromethane, dichloromethane, and acetonitrile) internal pressure, derived from the p,V,T data, are presented.     

Elastic, structural, bonding, and defect properties of zinc-blende BN, AlN, GaN, InN and their alloys

Simple tight-binding simulations, incorporating only the Herman–Skillman atomic term values, are shown to provide valuable information about the bonding, elastic and structural properties of zinc-blende group III-nitrides. Our calculated values of the elastic parameters (viz., bulk modulus, elastic stiffness constants, Kleinman's internal displacement parameter, Keating force constants, etc.) for BN, AlN, GaN, and InN are shown to exist well within the range of values derived from more sophisticated methods. Despite the crude approximations used, the tight-binding method has clearly provided the meaningful trends to the local distortions around isoelectronic impurities and has described reasonably well the bond length variations as a function of composition in ternary alloys.     

商业设计只有第一没有第二

许多人将设计和艺术、美术划上等号，似乎一件好的设计就应该等于一幅美丽的图稿．其实不然，美术与美学只是设计的基础（也该是一般大众生活的基础），设计的天空相当广阔，与每个人的生活经历和氛围皆有关连；因此我们可以说“设计是生活，生活是一切”。     

Autonomy, security, and inequality: China, India, the United States, and the globalization of science and technology

Perhaps no three countries have benefited from the globalization of science and technology (S&T) more than India, China, and the United States. All three have leveraged the growing internationalization of innovation to offset weaknesses in their own national innovation systems. Still, globalization raises critical questions of autonomy, security, and equality, and in turn the political struggle over these three issues shapes the pace and scope of the globalization of S&T. Significant deterioration on any one of these criterion could lead to substantially less support among policy makers and the public for the globally networked system of innovation that appears to be emerging.     

Structural transformations, reactions, and electronic properties of fullerenes, onions, and buckytubes

We describe the results of extensive quantum molecular dynamics calculations of the properties of fullerenes and microtubules. The topics to be discussed include: (i) stability of C₆₀ isomers and barriers to isomerization; (ii) reactivity of C₆₀ and C₅₈ with C₂ and C₃, and its implications on the formation and growth of fullerenes; and (iii) atomic and electronic structure and doping of semiconducting microtubules. We also discuss the structures, stabilities and atomic transformations of large multishell fullerenes and offer an explanation for the formation of spheroidal “onions” under high fluence electron irradiation conditions. The last results, which involved calculations for up to 15 000 atoms, were obtained using classical three-body potentials.     

Preparation and Properties of Sodium, Potassium, Magnesium, Calcium, and Aluminum Terephthalates

Group I–III terephthalates were prepared: KOOCC₆H₄COOH, NaOOCC₆H₄COOH, NaOOCC₆H₄COONa, Mg(OOCC₆H₄COO) · 2H₂O, Ca(OOCC₆H₄COO) · 3H₂O, and Al₂(OOCC₆H₄COO)₃ · 8H₂O. The salts were characterized by differential thermal analysis and IR spectroscopy. The results demonstrate that the thermal decomposition of the terephthalates yields metal carbonates or oxides. On heating to 1000°C, aluminum terephthalate converts into submicron-sized -alumina particles.     

Phosphorus,phosphorous, and phosphate

This article distinguishes the terms “phosphorus, phosphorous, and phosphate” which are frequently used interchangeably. We point out the difference between phosphorus and phosphate, with an emphasis on the unit of measure. Expressing a value without the proper name or unit of measure may lead to misunderstanding and erroneous conclusions. We indicate why phosphate must be expressed as milligrams per deciliter or millimoles per liter and not as milliequivalents per liter. Therefore, we elucidate the distinction among the terms “phosphorus, phosphorous, and phosphate” and the importance of saying precisely what one really means.