RE（NO_3）_3·（GLy）_3·nH_2O配合物的合成和表征

本文在水溶液中合成了镧、镨、钐和钆四种稀土硝酸盐与甘氨酸的固态配合物。化学分析表明，它们的化学组成分别是Ｌａ（ＮＯ＿３）＿３·（ＧＬｙ）＿３·Ｈ＿２Ｏ、Ｐｒ（ＮＯ＿３）＿３·（ＧＬｙ）＿３·Ｈ＿２Ｏ、Ｓｍ（ＮＯ＿３）＿３·（ＣＬｙ）＿３·３Ｈ＿２Ｏ和Ｇｄ（ＮＯ＿３）·（ＧＬｙ）＿３·３Ｈ＿２Ｏ。用红外光谱法和Ｘ射线衍射法测定了配合物的结构特征，表明它们是一类完全不同于稀土硝酸盐和甘氨酸的新化合物。同时，考察了配合物在几种常见溶剂中的溶解性。     

Eu（MBA）2NO3Phen配合物的发光光谱

在７７Ｋ测定了Ｅｕ（ｏ－ＭＢＡ）＿２ＮＯ＿３Ｐｈｅｎ和Ｅｕ（ｍ－ＭＢＡ）＿２ＮＯ＿３Ｐｈｅｎ配合物的激发光谱，发光光谱和时间分辨光谱。光谱数据说明由于邻甲基的位阻影响，在Ｅｕ（ｏ－ＭＢＡ）＿２ＮＯ＿３Ｐｈｅｎ配合物里存在化学环境稍有不同的两种Ｅｕ￣（３＋）格位，它们的局部对称性分别为ｃ＿２ｖ和ｃ＿１，ｃ＿２或ｃ＿ｓ。在Ｅｕ（ｍ－ＭＢＡ）＿２ＮＯ＿３Ｐｈｅｎ配合物里，仅存在一种Ｅｕ￣（３＋）格位，它类似于前一个配合物的ｃ＿２ｖ对称性的Ｅｕ￣（３＋）格位。     

三元体系La（NO_3）_3－Gly－H_2O的研究

测定了三元体系Ｌａ（ＮＯ＿３）＿３－Ｇｌｙ－Ｈ＿２Ｏ在２５℃时的溶度和饱和溶液的折光指数：报道了三元体系中生成的三元配合物：Ｌａ（ＮＯ＿３）＿３－Ｇｌｙ－Ｈ＿２Ｏｂ和Ｌａ（Ｇｌｙ）４（Ｏ３）３，Ｈ２Ｏ用熔点、红外光谱及热分析测定了名配合物的一些物理化学性质。     

Y(ClO_4)_3·3H_2O-B15C5-C_2H_5OH体系的相平衡研究及固态配合物的合成与表征

Ｙ（ＣｌＯ４）３３Ｈ２Ｏ－Ｂ１５Ｃ５－Ｃ２Ｈ５ＯＨ体系的相平衡研究及固态配合物的合成与表征温德才（福建龙岩师专化学系龙岩３６４０００）薛岗林何水样任德厚（西北大学化学系西安７１００６９）关键词三元体系相平衡配合物冠醚Ｂ１５Ｃ５三水高氯酸钇中图分类号６...     

稀土（Ⅲ）（4＇－溴－5＇－硝基苯并－15－冠－5）配合物的制备与表征

在乙腈和丙酮介质中合成了６种轻稀土硝酸盐与４＇－溴－５＇－硝基苯并－１５－冠－５（Ｌ）的固体配合物，经元素分析确定其组成为ＲＥ（ＮＯ＿３）＿３·Ｌ（ＲＥ＝－Ｌａ～Ｎｄ），Ｓｍ（ＮＯ＿３）＿３·Ｌ·Ｈ＿２Ｏ和Ｅｕ（ＮＯ＿３）＿３·Ｌ·ＣＨ＿３ＣＮ·４Ｈ＿２Ｏ，并进行了ＩＲ、ＵＶ、ＴＧ－ＤＴＡ、摩尔电导及Ｘ－射线粉末衍射物相分析等表征，探讨了冠醚苯基上引入双取代基（－Ｂｒ，－ＮＯ＿２）后对稀土离子配位作用的影响．     

三元体系Y(ClO4)3·3H2O—B15C5—CH3OH(25℃)的半微量相平衡研究

采用半微量相平衡方法研究了三元体系Ｙ（ＣｌＯ４）３．３Ｈ２Ｏ－Ｂ１５Ｃ５－ＣＨ３ＯＨ在２５℃的溶解度，测定了各饱和溶液的折光率。该体系在２５℃生成三种化学计量的配合物，其组成分别为：４Ｙ（ＣｌＯ４）３．３Ｂ１５Ｃ５．１２Ｈ２Ｏ．１２Ｃｈ３ＯＨ（Ｉ），Ｙ（ＣｌＯ４）３．２Ｂ１２Ｃ５．３Ｈ２Ｏ．Ｃｈ３ＯＨ（Ⅲ），其中配合物（Ｉ）和（Ⅱ）是溶解不一致化合物。在甲醇溶剂中，分离制备了配合物（Ⅲ），在６９－     

硝酸稀土与蛋氨酸配合物的合成及表征

在相平衡研究的基础上合成了１２种硝酸稀土与蛋氨酸的配合物。通式为ＲＥ（Ｍｅｔ）４（ＮＯ３）３·６Ｈ２Ｏ（ＲＥ＝Ｌａ～Ｎｄ，Ｓｍ～Ｄｙ，Ｅｒ，Ｙｂ，Ｙ）的配合物用化学分析、ＩＲ、电子光谱、ＦＳ、Ｘ射线衍射、ＴＧ－ＤＴＧ和ＤＳＣ进行了表征。在ＩＲ光谱中观察到的“四分组效应”规律表明：稀土阳离子与蛋氨酸间存在一定程度的共价。     

μ－4，4＇－联吡啶桥联三核Cu（Ⅱ）配合物的合成和磁性

合成了３种以４，４＇－联吡啶为桥联配体的三核环状Ｃｕ（Ⅱ）配合物［Ｃｕ＿３（４，４＇－ｂｐｙ）＿３·（ｐｈｅｎ）＿３］（ＣｌＯ＿４）＿６·２Ｈ＿２Ｏ（１）、［Ｃｕ＿３（４，４＇－ｂｐｙ）＿３］（ｂｐｙ）＿３］（ＣｌＯ＿４）＿６·Ｈ＿２Ｏ（２）和［Ｃｕ＿３（４，４＇－ｂｐｙ）＿３·（ＮＯ＿２－ｐｈｅｎ）＿３］（ＣｌＯ＿４）＿６·６Ｈ＿２Ｏ（３）。经元素分析、电导、ＩＲ、电子光谱、ＥＳＲ、磁化率等方法进行了表征，推定该配合物具有以４，４＇－联吡啶为扩展桥的结构。利用Ｈｅｉｓｅｎｂｅｒｇ模型求得交换参数Ｊ值为－０．２３ｃｍ－１（１）和－０．９０ｃｍ－１（３），表明配合物中金属离子间仅有很弱的反铁磁交换作用．     

铀(Ⅵ)、钍(Ⅳ)与邻香草醛缩联苯胺配合物的合成和性质

合成了硝酸铀酰、硝酸钍与双希夫碱邻香草醛缩联苯胺（以Ｌ表示）的两种新固体配合物。通过元素分析、差热－热重、红外光谱、紫外光谱、摩尔电导分析等手段，确定两配合物的组成分别为［ＵＯ２Ｌ（ＮＯ３）］ＮＯ３、［ＴｈＬ（ＮＯ３）２］（ＮＯ３）２。并对它们的配位方式及某些性质进行了研究。     

三元体系Y（ClO_4）_3·3H_2O—B15C5—CH_3OH（25℃）的半

采用半微量相平衡方法研究了三元体系Ｙ（ＣｌＯ４）３·３Ｈ２Ｏ－Ｂ１５Ｃ５—ＣＨ３ＯＨ在２５℃的溶解度，测定了各饱和溶液的折光率．该体系在２５℃生成三种化学计量的配合物，其组成分别为：４Ｙ（ＣｌＯ４）３·３Ｂ１５Ｃ５·１２Ｈ２Ｏ·１２ＣＨ３ＯＨ（Ⅰ）、Ｙ（ＣｌＯ４）３·Ｂ１５Ｃ５·３Ｈ２Ｏ·１．５ＣＨ３ＯＨ（Ⅱ）与Ｙ（ＣｌＯ４）３·２Ｂ１５Ｃ５·３Ｈ２Ｏ·ＣＨ３ＯＨ（Ⅲ），其中配合物（Ⅰ）和（Ⅱ）是溶解不一致化合物．在甲醇溶剂中，分离制备了配合物（Ⅲ），在６９—７２℃下干燥得到配合物Ｙ（ＣｌＯ４）３·２Ｂ１５Ｃ５·３Ｈ２Ｏ．利用ＩＲ光谱、电导测量及Ｘ－射线衍射分析对配合物进行了表征．     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Microwave-assisted copper-catalyzed stereoselective ring expansion of three-membered heterocycles with α-diazo-β-dicarbonyl compounds

Microwave-assisted copper-catalyzed ring expansions of three-membered heterocycles with α-diazo-β-dicarbonyl compounds were investigated. Thiiranes generated 3-acyl-5,6-dihydro-1,4-oxathiines in the presence of copper sulfate and trans-3-acyl-5,6-dihydro-1,4-oxathiines as stereospecific products for 1,2-disubstituted cis-thiiranes through an intramolecular S_N2 process. Oxiranes gave rise to 2-acyl-5,6-dihydro-1,4-dioxines under the catalysis of copper hexafluoroacetylacetonate and cis-3-acyl-5,6-dihydro-1,4-dioxines as stereospecific products for 1,2-disubstituted cis-oxiranes via an intimate ion-pair mechanism. The current method provides a direct and simple strategy in efficient preparation of 3-acyl-5,6-dihydro-1,4-oxathiines and 2-acyl-5,6-dihydro-1,4-dioxines, important agents in medicinal and agricultural chemistry, from readily available thiiranes and oxiranes, respectively.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).