A Novel Layered Supramolecular Network Constructed from Heterohexanuclear La（Ⅲ）—Cr（Ⅲ）Complexes by Hydrogen Bonding

1 INTRODUCTION In recent years, the assembly of extended supramolecular architectures from molecular building units has yielded a new generation of materials with diverse network topologies[1～6]. A number of such frameworks have been found to exhibit fascinating physical and chemical properties. In particular, much work has been focused on the use of the oxalate ions as bridging ligands to afford two- and three-dimensional homo- and heterometallic assemblies[7～13]. These complexes can…     

Synthesis and Crystal Structure of a New One-dimensional Double Helical-chain Polymer, {Zn（O2CC12H8CO2）（H2O）}n

1 INTRODUCTION Pronounced interest has been put in the field of coordination polymeric complexes owing to their fas- cinating molecular topologies[1～3] along with poten- tial applications as functional materials[4～6]. In par- ticular, complexes with helical structures attract much attention of scientists[7, 8] mainly due to their simi- larity to the structure of DNA molecule. To obtain new complexes, solv- and hydrothermal routes are currently used. In this way, the organic ligand act…     

Hydrothermal Synthesis and Crystal Structure of a Square Grid Coordination Copper(II) Polymer from 1,4-Bis(imidazole-1-ylmethyl)benzene

1INTRODUCTION The employment of transition metal ions and ap-propriate bridging ligands has become a dominant theme in the construction of some interesting ar-rays[1,2],especially for the large square grid net-works.Recently,considerable research effort has been focused on the studies of polymeric frame-works with the ligands based on imidazole.These polymers are of great interest not only due to their intriguing topologies but also the potential applications in ion exchange,magnetic and e…     

Theoretical Study of Nonclassical Platinum Complexes Bonding to Purine Bases： How the Long-lived Monofunctional Adducts Can Be in Existence？

1 INTRODUCTION Since the discovery of the anticancer activity of cisplatin by Roserberg, cisplatin has become one of the most widely utilized antitumor drugs in the world, with an annual sales of approximately 500 million dollars[1~6]. Because of the successful story of cisplatin, a great deal of attention was drawn to platinum complexes and many studies were focused on the influence of different ligands and conforma- tions on anticancer property[7]. Subsequently, much progress has been …     

Thermal Behavior of Zn(Thr)SO_4·H_2O

IntroductionRecently,a considerable interest has been fo-cused on the complexes of zinc with amino acidsdue to their excellent additives in medicine foodstuff and cosmetics[1— 6] .The investigation on thethermal behavior and the thermochemistry of somezinc amino acids is important to its further applica-tion,which has been reported in references[4,5 ,7— 1 0 ].However,the studies on solid complexZn( Thr) SO4· H2 O has not been reported,whichcan provide the necessary data and the foundation…     

A Novel 3D Supramolecular Network Constructed from [Cu(4,4'-bipyridine)(O_2CMe)_2]_2 Molecular Ladders by Hydrogen Bonding

1 INTRODUCTION In recent years, the assembly of extended supra- molecular architectures from molecular building units has yielded a new generation of materials with diverse network topologies[1～3]. A number of such frameworks have been found to exhibit fascinating physical and chemical properties. The investigation of hydrogen bonding is important for many practical applications, such as the design of antibiotics and development of new materials with programmed properties[4]. A great va…     

稀土硫化物：e–己内酯开环聚合新催化剂

The ring-opening polymerization （ROP） of ε-caprolactone （ε-CL） using lanthanide thiolate complexes [（CH3CsH4）2Sm（μ-SPh）（THF）]2 （1） and Sm（SPh）3（HMPA）3 （2） as initiators has been investigated for the first time. Both of 1 and 2 were found to be highly efficient initiators for the ROP of ε-CL. The poly（ε-caprolactone） （PCL） with molecular weight Mn up to 1.97 ×10^5 and relatively narrow molecular weight distributions （1.20〈MW/Mn〈 2.00） have been obtained in high yield in the temperature range of 35-65℃. According to the polymer yield, 2 showed much higher activity than 1. However, the number-average molecular weight of PCL obtained with 2 was much lower than with 1. The possible polymerization mechanism of the ε-CL polymerization has been proposed based on the results of the end group analysis of the ε-CL oligomer.     

One-dimensional Zigzag Chain Composed of HgI2 Unit and 2,5-Bis（4-pyridyl）- 1,3,4-thiadiazole： [HgI2（C12H8N4S）]

1 INTRODUCTION Much interest has been focused on the design and syntheses of supramolecular coordination polymers with novel topologies and structural motifs because of their encouraging potential applications in the fields of nonlinear optics, catalysis and separation, magnetism and molecular recognition[1, 2]. In princi- ple, control over the type and topology of the coor- dination polymers can be achieved by careful choice of ligand, metal coordination geometry preference, inorganic cou…     

二维配合物[Cd_3(HBTA)_2(BIPA)_3]_n的水热合成、晶体结构和荧光性质研究(英文)

<正>Great interest has been focused on the rapidly expanding field of the construction of novel functional metal-organic frameworks(MOFs)owing to their variety of intriguing architectures and topologies and their potential applications in magnetism     

Synthesis and Structural Characterization of a New Cadmium(II) Complex with a Double Betaine

1 INTRODUCTION The construction of supramolecular aggregates has received much attention due to their intriguing network topologies and potential functions as new classes of materials[1, 2]. Multiple noncovalent interac- tions, such as hydrogen bonds, π-π stacking and host- guest ionic interactions, play important roles in the supramolecular assembly of metal ions and organic ligands[3, 4]. In this context the multidentate ligands with conjugated groups are employed as building blocks in…     

Synthesis and Crystal Structure of DinuclearCadmium Complex [Cd2（phen）4（fca）2]（ClO4）2-（H2O）2

1 INTRODUCTION During the search of molecule-based materials with interesting properties such as catalysis, cla- thration etc., much attention has been focused on the synthesis of one-, two- and three-dimensional extended solids involving cadmium[1], as its d10 configuration permits a wide variety of geometries and coordination numbers. Rigid bridged ligands such as carboxylate groups are frequently used to construct these materials. Therefore, the coordi- nation chemistry of Cd(Ⅱ) ca…     

Syntheses,Crystal Structures and Fluorescence of Cadmium(II) Coordination Polymers with Pyrazine-1,4-dioxide, 2-Methylpyrazine-1,4-dioxide and Thiocyanate as Mixed Bridge Ligands

1 INTRODUCTION For a long time much research interest has been focused on the coordination polymeric compounds because such new coordination polymers may afford new materials with useful properties, such as catalytic activity, micro-porosity, electrical conduc- tivity, non-linear optical activity, magnetic coupling behavior and so on[1, 2]. Thiocyanate anion as well as pyrazine-1,4-dioxide and its derivatives belongs to very useful bridge ligands and many complexes[3, 4] with one of them e…     

A Novel Mo—Doped Compound with Graphite—Like Structure：[H3O]2V3O8

1 INTRUDUCTION During the last few years, there has been much effort paid to the synthesis of new transition-metal oxides that might be active hosts for intercalation reactions. Vanadium and molybdenum in higher oxidation states with higher reacting ability tend to form polynuclear, anionic metal-oxygen clusters with an extraordinary variety of the relevant topology and electronic structures[1~3]. The preparation of the corresponding clusters is of special interest for different aspects …     

甲烷氧化制合成气两段反应新工艺

Interest in conversion of natural gas to liquid hydrocarbons (GTL) by Fischer-Tropsch synthesis has grown significantly over the last decade. Most research and development work has focused on syngas production step, which accounts for more than 50% of the total investment. Reducing the cost of syngas production would have great beneficial effects on GTL process. Catalytic partial oxidation of methane (CPOM) to syngas is a slightly exothermic, highly selective, and energy efficient process. It gives syngas with n(H2)/n(CO)=2, directly suitable for F-T synthesis. However, CPOM process has not yet been used commercially. The major engineering problems are the high temperature gradient and the risk of explosion with premixed CH4-O2 mixture, which is within the ignition and explosion limit. In fluidized-bed reactors, the heat transfer is much better, which ensures a more uniform temperature and safer operation. A technology for syngas production by contacting CH4 with limited amount of steam and O2 in a fluidized-bed reactor has been developed[1].     

Synthesis and Crystal Structure of a New Mononuclear Nickel（Ⅱ） Mixed Complex Derived from 2-Aminoethyl-bi（3-bi-aminopropyl）amine with 1,10-Phenanthroline

1 INTRODUCTION The research on organic polyamines is currently of great interest because of their potential applica- tions as useful organic ligands, in which the amine nitrogen atoms have strong coordination ability to the transition metal ions and recognition function[1~4]. Their transition metal complexes play an excellent role in catalysis and mimic studies on dismutase and chlorophyll[5~7]. Therefore much attention has been focused on their syntheses and applications[8~11]. Our group…     

Synthesis and Crystal Structure of N,N~′-Bis(p-nitrophenyl)-2,2~′-(p-phenylene-dioxy)diacetamide DMF Monohydrate

1 INTRODUCTION Many crown ethers have been synthesized[1, 2] and widely used[3～5]. The amide-type acyclic poly- ethers with versatile molecular structures offer many advantages over the traditional crown ethers, such as their potential activity for ion-selective electrodes[6] and the extraction of metal ions[7], so they have attracted much scientific attention[8～10]. In an effort to investigate the effect of skeleton of acyclic polyether on the extractability of metal ions, and to find …     

Synthesis and Crystal Structure of a 3-D Hydrogen-bonded Supramolecular Decavanadate Compound [Habo]_6[V_(10)O_(28)]·2C_3H_7OH·2H_2O

1 INTRODUCTION The chemistry of polyoxometalates has been at- tracting much attention due to the richness in their structures, electron and proton storage abilities, ther- mal stability and applications in catalysis, medicine and surface sciences[1～3]. In recent years, the mixed- valence as well as full oxidized vanadium polyoxo- anions have been crystallized with a variety of orga- nic molecules as counteranions[4～8]. However, the guiding principles of the crystal structures of poly- o…     

Synthesis and Crystal structure of cis—Dichloro—（tetrakis（methylthio）—ethylene）Palladium（Ⅱ）

1 INTRODUCTION Recently much more attention has been paid to palladium bidentate chelate. Such as palladium diphosphino complexes can be used to catalyze crossing-coupling[1] and monocoupling[2]; palladium diamine complexes can be used to catalyze norbornene polymerization[3] and it can also bind to biologically important molecules[4]. Owing to the above reasons, palladium(Ⅱ) complexes with these ligainds are well researched. However, the neutral analogs with derivatives of dithiole are…     

A Novel Method for Synthesizing 4,4′-Bis(hydroxymethyl)-2,2′-bipyridine

IntroductionSince C. W. Tang firstly reported theelectroluminescence of 8- hydroxyquinolinealuminium[1] ,much attention has been paid to themetal complexes as electro- luminescent materials.Based on a series of experimental data,it has beenknown that the electroluminescence of metalcomplexes with heterocyclic ligands containing Nand O elements mainly results from the tripletstatetransition.For some transitional metal complexes,there exist the transitions from metal to ligand( MLCT) at thei…     

Hydrothermal Synthesis and Structure of a New Molybdenum Phosphate: (NH_3CH_2CH_2NH_3)_(2.5)[Mo_5O_(15)(PO_4) (HPO_4)]·7.5H_2O

1 INTRODUCTION A new class of materials of metal oxide clusters based on anionic molybdenum phosphate frameworks has received much attention as a consequence of their potential applications in catalysis and materials science [1]. As a result, some molybdenum phosphates have been studied [2,3]. Recently we have studied the structure of NaPMO material[4] and the spectrum of multicomponent compound with Keggin struc- ture [5]. Here we report the synthesis and crystal structure of a new…