Synthesis, Spectroscopic Properties and Crystal Structure of (C_4N_2H_(12))_2Zr(C_2O_4)_4·H_2O

1 INTRODUCTION The researches on transition metal coordination complexes have been rapidly expanded because of their fascinating structural diversity and potential applications[1～4]. As we know, zirconium oxalates can be used as precursors in the synth…     

Synthesis and Crystal Structure of a Novel Three-dimensional Cu(II) Compound{[Cu(2,2''''-bipy)(C_7H_4O_5S)(H_2O)_2]·H_2O}_n

1 INTRODUCTION Recently, the design and synthesis of novel inorg-anicorganic supramolecular complexes have been at-tached more and more attention due to their poten-tial applications in many areas[1～3]. Copper complex-es have attracted much attention owing to their intri-guing properties, such as molecular magnetization,absorption, heterogeneous catalysis, etc[4, . A series5]of copper-carboxylate complexes have been reportedand all kinds of coordination models of the car-boxylic group a…     

Synthesis and Crystal Structure of the Organotin Complex [(o-Cl-PhCH_2)_3SnOCOC_(10)H_8N]·0.5C_6H_6

1 INTRODUCTION There is increasing interest in the study of orga-notin carboxylic ester compounds due to their insec-ticidal, fungicidal and antibiotic activities[1, as well 2]as structure diversity. In recent years many organo-tin carboxylic ester compounds with good biologi-cal activity have been synthesized[3, . Previous stu- 4]dies show that the coordination geometry of centralatom Sn …     

Syntheses and Crystal Structures of Two Cyano-bridged Bimetallic Complexes [Ce(DMSO)_4(H_2O)_3Fe(CN)_6]·H_2O and [La(DMSO)_4(H_2O)_3Co(CN)_6]·H_2O(DMSO = Dimethylsulfoxide)

1INTRODUCTION Recently,cyano-bridged lanthanide-transition me-tal complexes have been extensively investigateddue to their potential applications as precursors in the preparation of rare earth orthoferrites,fluores-cent and magnetic materials[1].Various complexes of this system have been obtained in order to ex-plore the relations between structures and pro-perties by using different ligands,such as DMF,4,4?-bipy,and so on,to fill the coordination sites of lanthanide ions[2～9].But up to…     

Hydrothermal Synthesis and Crystal Structure of Iron Molybdophosphate Fe[Mo_6O_(12)(OH)_3(H_2PO_4)(HPO_4)_2(PO_4)]_2- [Fe(2,2′-bipy)(H_2O)_2]_2[Fe(2,2′-bipy)_3]_2·6H_2O

1 INTRODUCTION Organic-inorganic hybrid materials and polyoxo-metalates have received much attention because of their intriguing structural diversity and potential applications in molecular adsorption, ion exchange, heterogeneous catalysis and nanotech nology as well as in electrical, magnetic and photochemical areas[1, 2]. One of the important ad- vances in the design of new organic-inorganic hybrid materials is utilizing poly- oxometalates’ coordination ability to produce poly- oxoanio…     

Synthesis and Crystal Structure of [Cu(phen)_2(SO_4)(H_2O)]·0.5C_4H_4O_4·7H_2O

1INTRODUCTION The construction of metal-organic coordination polymers based on covalent interactions[1]or supra-molecular contacts such as hydrogen-bonding and/orπ-πinteractions)[2]is now of great interest not only due to the enormous variety of intriguing structural topologies themselves,but also to their unexpected physical and chemical properties for potential prac-tical applications as functional materials.Many N-containing ligands,such as4,4?-bipyridine,2,2?-bi-pyridine and1,10-phen…     

Synthesis, Crystal Structure and Electrochemical Properties of Complex [Ni(2,2’-bipy)_2(ClC_6H_4COO)(H_2O)](ClO_4)

1 INTRODUCTION Nickel is vital for organism as a trace element and it often acts as component or secondary factor of enzyme. In the latest two decades, biological inor- ganic chemistry of nickel has become one of the hottest fields and the coordination chemistry of nic- kel has made a great progress[1]. Complexes built upon organic aromatic carboxylic acid and metallic ion have attracted chemists’ interest for years due to their potential applications in material, medicine, molecular ele…     

Synthesis and Structural Characterization of Mononuclear Mn~(II) Picolilato Complex Mn(2-C_5H_4NCOO)_2(H_2O)_2.1/2CH_3CN

1 INTRODUCTION Manganese has been implicated as an essential part of the active center in various manganese enzymes. Various nuclearities have been observed from mononuclear atom in superoxide dismutase [1] to the tetranuclear atom of oxygen evolution in photosystem II[2]. The manganese active centers in biological systems are surrounded by O and N coordination sphere[3, 4]. Synthetic efforts have produced a great variety of Mn clusters with varying nuclearity and oxidation states. Si…     

Synthesis and Crystal Structure of Cadmium（Ⅱ） Complex [Cd（H2O）（CH3OC6H4COO）2]n

1 INTRODUCTION Cadmium (Ⅱ) complexes have been exten- sively studied from both chemical and structural views, mainly due to the capability of cadmium (Ⅱ) (shared by most d10 metal ions) to adopt different modes of coordination determined by the consideration of size, as well as electrostatic and covalent bonding forces[1]. And the field of coordination polymers has witnessed tremendous growth over the last decade[2]. Many coordination polymeric networks have been shown to posses intere…     

Synthesis and Structural Characterization of a Ni(Ⅱ) Complex [Ni(H_2O)_4(4,4'-bipy)_2](hca)_2

1 INTRODUCTION The rational design and synthesis of new metal- organic frameworks have generated considerable interest in supramolecular chemistry and materials science owing to their intriguing structural diver- sities and potential applications as functional mate- rials[1～6]. Carboxylate-containing ligands have attrac- ted considerable attention because of the various coordination modes of carboxylate group, the ability to form hydrogen bonds and the potential applica- tions as functio…     

Crystal Structure of a Novel Complex Na_4[Y(PDC)_2(BTC)]·5H_2O with One-Dimensional Helical Network Structure (H2PDC = 2,6-Pyridinedicarboxylic acid)( H_3BTC = 1,3,5-Benzenetricarboxylic acid )

1 INTRODUCTION The assembly of coordination networks is a field of increasing interest[1~4]. Research along this line is induced by the idea that coordination networks have potential technological applications such as optoele- ctronic devices and microporous materials for shape and size separation and catalysis[5~7]. In this paper, there has been current interest in using polycarboxy- late as anion linking groups to support stable poly- meric coordination open frameworks with transition m…     

Hydrothermal Synthesis and Structure of a Novel Coordination Polymer Co_3(tma)(pda)_2(H_2O)_3]n·nH_2O

1INTRODUCTION Recently,the design and preparation of coordina-tion polymers with new porous frameworks are of great interest due to their potential functionalities such as catalysis,gas absorption,separation and molecu-lar recognition.In designing1-D,2-D and3-D porous coordination polymers,the selection of appropriate ligands is crucial for determining the structure.The mixed-linker systems of both carboxylates and pyri-dyls have proved to be effective for the preparation of novel coordi…     

TBB STRUCTURE OF TRINITRATE-TRIS[DIPHENYE SULFOXIDE]-LUTETIUM Lu(NO_3)_3· [(C_6H_5)_2SO]_3

<正> INTROdUCTION. This is one of serial compounds with ligands of trinitrate and diphenyl sulfoxide. In order to research rules of coordination of lanthanide complexes, we have determined the structure of the title compound by X-ray analysis.     

Synthesis and Crystal Structure of [Ni(C_5H_2N_2O_4)(2,2''''bipy)(H_2O)_2]·H_2O

1 INTRODUCTION Orotic acid (H3dtpc), an important pyrimidine derivative as the effective precursor in the biosynthesis of pyrimidine base of nucleic acids in living organisms, plays a unique role in bioinorganic and pharmaceutical. Aside from the biological interest, orotic acid is also interesting in coordination chemistry. Its ketonic and enolic tautomers along with asymmetric geometry make it to be a very good versatile polydentate ligand[1~5]. The incorporation of metals into supram…     

Non-Isothermal Decomposion Kinetics of Supermolecule Compound [Eu(C_(10)H_9N_2O_4)(C_(10)H_8N_2O_4)(H_2O)_3]_2·phen·4H_2O

Europium(Ⅲ) compound with 2-oxopropionic acid salicyloyl hydrazone (C_(10)H_(10)N_2O_4,H_3L) and 1,10-phenan-throline (C_(12)H_8N_2,phen) has been prepared.A yellow prismatic crystal of the compound was obtained,and themolecule crystallized in the triclinic space group P-1.There are two 9-coordinated complex molecules in everystructure unit,where every Eu atom is coordinated by three water molecules and two tridentate C_(10)H_(10)N_2O_4 ligands,forming two stable pentacycles.The coordination polyhedron around Eu~(3+) was described as a single cap squareantiprism.In the crystal cell,there are one free 1,10-phenanthroline and four water molecules.The thermaldecomposition of the compound and its kinetics were studied by non-isothermal thermogravimetry.The Kissinger'smethod and Ozawa's method were used to calculate the activation energy value of the first-step decomposition.Thestages of the decompositions were identified by TG-DTG-DSC curve.The non-isothermal kinetic data were ana-lyzed by means of integral and differential methods.The possible reaction mechanism and the kinetic equationswere investigated by comparing the kinetic parameters.     

Synthesis and Structural Characterization of a Novel 2D Supramolecular Complex {[Dy_2Zn(dinic)_4(H_2O)_8]·H_2O}n (H_2dinic = 2,5-Pyridinedicaboxylic Acid)

1INTRODUCTION Studies on the syntheses,structures,and proper-ties of lanthanide-transition metal complexes are currently of great interest not only due to their beha-viors as good models to investigate the nature of magnetic exchange interactions between3d and4f metal ions in magnetic materials but also to the fascinating coordination properties of Ln(III)[1～6].Although some infinite lanthanide(III)-transition metal compounds have been obtained by the con-ventional self-assembly reacti…     

Thermokinetics on the reaction of formation of Dy[(C_5H_8NS_2)_3(C_(12)H_8N_2)]

The enthalpy change of formation of the reaction of hydrous dysprosium chloride with ammonium pyrrolidinedithiocarbamate (APDC) and 1,10-phenanthroline (o-phen·H2O) in absolute ethanol at 298.15 K has been determined as (-16.12±0.05) kJ·mol-1 by a microcalor-meter. Thermodynamic parameters (the activation enthalpy, the activation entropy and the activation free energy), rate constant and kinetics parameters (the apparent activation energy, the pre-exponential constant and the reaction order) of the reaction have also been calculated. The enthalpy change of the solid-phase reaction at 298.15 K has been obtained as (53.59±0.29) kJ·mol-1 by a thermochemistry cycle. The values of the enthalpy change of formation both in liquid-phase and solid-phase reaction indicated that the complex could only be synthesized in liquid-phase reaction.     

SYNTHESIS OF LANSFORDITE MgCO_3·5H_2O AND ITS CRYSTAL STRUCTURE INVESTIGATION

Euhedral crystals of the uncommon low-temperature mineral lansfordite have been obtained by the synthetic method, and the crystal structure analysis has been accomplished correspondingly. The structural parameters and the general view of structure were presented for the first time. The results obtained show that the coordination configuration of two magnesium ions in the unit cell is octahedral arrangement and the coordination number is 6, but in two forms: one in the complex ion Mg(CO_3)_2(H_2O)_4~(2-) and the other in the Mg(H_2O)_6~(2+). There is only a CO_3~(2-) group in the structure, not three distinct groups as reported by Hill et al. previously based on the IR absorption spectrum research data. The authors of this paper believe that the exact chemical formula of lansfordite should be expressed as "Mg(H_2O)_6. Mg(CO_3)_2 (H_2O)_4", and MgCO_3-5H_2O is only a simple chemical expression.     

A Corrugated 2D Mn(Ⅱ) Network:[Mn_3(μ-oxalate)_3(μ-4,4'-bpy)_2(4,4'-bpy)_2]_n

1 INTRODUCTION It is well known that the bi-functional 4,4?-bi- pyridine (4,4?-bpy) has the ability to act as a rigid, rod-like organic building block in the self-assembly of coordination frameworks. Many researches have also been done on the metal oxalate compounds. The remarkable coordination abilities of oxalate and 4,4?- bpy ligands are applied to design and synthesize new polymeric coordination complexes[1～4] containing mixed bridging ligands. Manganese is one of the several first-r…     

Synthesis and Crystal Structure of 4-Salicylimine-3,5-bis(2-hydroxyphenyl)-1,2,4-triazole

1 INTRODUCTION 1, 2, 4-Triazole and its derivatives have gained great attention as ligands to transition metals by the fact that they unite the coordination geometry of both pyrazoles and imidazoles, and in addition exhibit a strong and typical property of acting as bridging ligands between two metal centers. In this bridging capacity, the 1, 2, 4-triazole ligands show a great coordination diversity, especially when the triazole nucleus are substituted with additional donor groups[1]. In…