Synthesis and Structural Characterization of [(C_2H_5)_4N][V~((V))O_2(OC_6H_3(OCH_3)CHNNCSNH_2)]·H_2O

1 INTRODUCTIONAlthough vanadium plays an increasingly recognized role as a biometal[1~4], little is known about the structure and function of vanadium compounds in living organisms. A classical and nevertheless rapidly developing field of application for oxovanadates and related compounds is their use as catalysts in polymerization and oxidation reactions[5,6], and recent interest has focused on oxovanadates as model compounds for the interaction of oxovanadates with the active sites of en…     

配合物[Mn(2,2′-bipy)(H_2O)_4]·(m-phth)的水热合成和晶体结构(英文)

0IntroductionAs the active sites of several mononuclear en-zymes are five-or six-coordinate manganese speciescontaining coordinated carboxylate groups,water andnitrogen-donor molecules research on the coordinationcompounds of manganese with such coligands hasgrown[1,2].There has been extensive interest in man-ganese chemistry due to the involvement of manganesein many biosystems and magnetic materials[3￣5].Theisophthalate as a potential bidentate ligand seemsquite suitable for self-assembly s…     

Characterization and Crystal Structure of Bis(N'-ethyl-N-piperazinly-carbodithioato-S,S') Nickel(II) Complex:Ni(S_2CNC_4H_8NC_2H_5)_2

1 INTRODUCTION The ability of dialkyldithiocarbamate anion, -S2- CNR2 (dtc) ligand, to bind metal has been known for many years[1, 2]. It forms a chelate with virtually all transition elements and is proven to be a versatile chelating agent for the separation and extract of metals in analytical chemistry and mineral floa- ting[3～5]. Water soluble dialkyldithiocarbamate com- plexes have been tested in various medical appli- cations[6]. Some of substituted dithiocarbamate salts also show …     

A Novel 3D Extended Network Cobalt Paradodecatungstate:Synthesis,Characterization and Crystal Structure of [Co(H_2O)_5]_2[Co(H_2O)_4]_3[H_2W_(12)O_(42)]·11H_2O

1 INTRODUCTION Polyoxometalates are the unique metal-oxygen clusters composed of transition metals in groups V and VI (Mo, W, V, Nb, Ta) in a high oxidation state showing a large structural varieties as well as inte- resting physical and chemical properties in diverse fields including catalysis, analytical chemistry, nanotechnology, chemical sensing, biochemical and geochemical processes, medicine and materials science[1～5]. Recently, there has been increasing interest in the synthesis…     

CRYSTAL STRUCTURE OF BIS(η~5-CYCLOPENTADIENYL-η~6-TETRAHYDRONAPHTHALENE-IRON(II)) DODECAHYDRO-DODECABORATE(C_(15)H_(17)Fe~+)2·B_(12)H_(12)~(2-)

<正> Introduction. The structure of the title compound has been determined as a part of our studies on the structural chemistry of arenecyclopentadienyl-iron boronhydrides. The structure of the cation (C_10H_12FeC_5H_5)+ was reported for the first time.     

Syntheses and Crystal Structures of Sm(OAr)+2(THF)+3·THF and Sm(OAr)_2(DME)_2 (Ar =C_6H_2-tert-Bu_3-2,4,6)

1 INTRODUCTION The chemistry of divalent lanthanocenes has de- veloped rapidly. Attempts to extend the chemistry beyond the traditional realm of the lanthanocenes have led to the syntheses and structural characteri- zations of a number of lanthanide (II) complexes bearing various ligand systems. Aryloxide ligands have been attractive for their strong bonds with lan- thanide atoms and readily steric modification by the choice of substituents. A series of divalent lantha- nide aryloxides …     

Hydrothermal Synthesis and Crystal Structure of [H_4As_8V_(14)O_(42)(H_2O)]·6H_2O

1 INTRODUCTION The chemistry of polyoxometalates continues to attract interest as a result of their realized and potential applications in diverse fields, such as cata- lysis, analysis, biochemistry, medicine and material science[1～3]. In the past few …     

Synthesis and Crystal Structure of Na_(10)[LaSiW_(11)O_(39)(H_2O)_4]_2·22H_2O

1 INTRODUCTION The pseudoliquid character of heteropoly compounds as catalysts is determined by their crystallographic properties. Study on the crystal structures of the heteropoly compounds could provide interesting information to enrich heteropoly acid and catalytic chemistry[1]. In the past, Zhuo Ying-Li抯 group has synthesized the carbamidine salts of 1:1 LnL(Ln=lanthanide, L=[SiW11O39]n－)[2], and Pope抯 group has reported that -SiW11O39 units are connected by lanthanide catio…     

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 18-Tungstotetranickel(II) diphosphate Na_(10){(PW_9O_(34))_2Ni_4(H_2O)_2}·26H_2O

1 INTRODUCTIONThe inorganic chemistry concentrating on polyoxometallates, is in a position to connect elementary building blocks and their derivatives in different ways, enabling people to synthesize a large variety of remarkable substances, especially those in the "nanoworld". Of particular importance is the anionic-type which has {MOx}-type building-block units, where M stands for the d block elements in high oxidation states.[1] In 1973 Weakley, Evans and Showell isolated[2] K10P2W1…     

Theoretical Studies on the Intermonomer Interaction of F~-·(H_2O)_n (n = 1, 2)

1 INTRODUCTION Hydrogen bond plays an important role in the fields of physics, biology and chemistry. It has cap- tured the interest of chemists for a long time and reports about its theory and experiment have been well represented[1～6]. Concerning its theoretical inves- tigations, most of the emphases are placed on the weak interaction energy of intramolecular hydrogen bond. But studies on its spectrum behavior are rela- tively rare. These years spectrum behavior led by hydrogen bond h…     

Synthesis and Crystal Structure of [Cis-1,10phenanthroline-palladium(Ⅱ)(THF)_2]dinitrate (THF = Tetrahydrofuran)

1 INTRODUCTION The coordination chemistry of Pd(Ⅱ) com- plexes with didentate nitrogen coordination ligands has been extensively studied for a few decades[1]. Pd(Ⅱ) trends to bond to the didentate nitrogen in cis-mode and such complexes have potential usage in the emerging area of self-assembly[2]. We will report herein the synthesis and crystal structure of a cis-coordinated mononuclear Pd(Ⅱ) complex with one 1,10-phenanthroline and two THF as ligands, 1. 2 EXPERIMENTAL 2. …     

Synthesis, Crystal Structure and Spectroscopic Properties of an Octanuclear V-S-Cu Cluster {V_2S_6Cu_6}(PPh_3)_6(O)_2·2CH_2Cl_2·CH_3OH with a Metal-sulfur Dodecahedral Cage

1 INTRODUCTION The reactivities of the thiometalates [MOnS4-n]z－ (n=0~2) and their applications in synthetic chemistry are very attractive because they have been shown to act as multi-ligands to a wide variety of metal ions[1]. The chemistry of Mo(W)S clusters derived from thiometalates has been most highly developed[2] for some MoS clusters are closely relevant to biological activities[3,4]. As for thiovanadates, only [VS4]3－ species has been used as ligands to coordinate metal at…     

Theoretical and Experimental Studies on the Metal Complex of Diethylenetriamino-trioxo-molybdenum(VI) [MoO_3(NH_2C_2H_4NHC_2H_4NH_2)]

1 INTRODUCTION Molybdenum is a biologically important trace ele- ment that occurs in the redox-active sites of moly- bdoenzymes involving in nitrogen, sulfur or carbon metabolism. The structural chemistry of molybde- num complexes has aroused considerable interest in view of its higher oxidation states to form a number of compounds containing MoO groups, and informa- tion on these is very useful in understanding the behavior of MO groups generally[1~3]. Molybdenum oxide-based solids hav…     

Chemical Fixation of CO_2 with Highly Efficient ZnCl_2/[BMIm]Br Catalyst System

The search for environmentally benign and economic process has been the impetus for much of the research involving epoxide and carbon dioxide coupling in view of the so called “green chemistry ” and “ atom economy ”, since CO2 is a renewable resource and can be used as a safe and cheap C1 building block to synthesize useful organic compounds without producing any coproducts.[1-2] One of the most attractive synthetic goals starting from carbon dioxide is the chemical fixation of CO2 onto e…     

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…     

A Novel Ni-capped Silverton-type Complex: H_4{[Ni(H_2O)_3]_2[CeMo_(12)O_(42)]}·13.5H_2O

1 INTRODUCTION Polyoxometalates are metal-oxygen clusters with almost unrivaled versatility, which results from their enormous structural variety, range of sizes, tunable redox properties and fascinating catalytic activi- ties[1~7]. Therein, an important progress in transition metal oxide cluster chemistry has been the study of polyoxoanion-substituted and supported inorganic or organometallic complexes[8, 9]. However, modified polyoxoanions with divalent first-row transition me- tal as c…     

Synthesis, Properties and Crystal Structure of a Novel Coordinated Polymer:{(H_2en)(H_3O)[(BiPb(C_2O_4)_4(H_2O)_2)]·2(H_2O)}_n

1 INTRODUCTION It is well-known that bismuth and lead display attractive properties as promoting elements in noble metal-based catalysts[1], and thermal decomposition of ammonium metal oxalates can yield crystalline porous materials with a high surface area. This feature makes them attractive as precursors for catalysts and other nanocrystalline oxides[2]. Because of their topology, the oxalates themselves also possess inte- resting properties such as the capability of ion-exchange. The …     

Structural Determination of Bis-histidinopeptide Zinc Complexes by 15N NMR (HMBC) Spectra

Polynitrogen receptors such as bis-histidine peptides possess strong ability to bind metals, which play much important roles in medicinal, bioinorganic, bioorganic, biomimetic and supramolecular chemistry. In order to investigate the interaction of these hosts with a variety of neutral, cationic and anionic guests, several techniques, for example, NMR,potentiometric tirations and monocrystal X-ray diffraction have been employed. Among them NMR is a powerful technique for unraveling the structure of polynitrogen receptors as long as they are in solution where the rapid tumbling of molecules averages out the anisotropies such as chemical shift and dipole-dipole interactions. General 1H NMR approach has been widely used for the study of host-guest interaction, but it is difficult for the accurate measurement in complexes structures, particularly metal complexes structures in which how the polynitrogen receptors bind metal, and which nitrogen binds metal and so on.     

Aromatic Character of All Possible C_(36)H_2 Isomers

1 INTRODUCTION Hydrogenated fullerenes have become one of the most intense studies of fullerene chemistry. Most researches are mainly focused on C60 and C70 cages, and C36 has received much attention in recent years. In 1998, Piscoti et al.[1] reported a solid-state nuclear magnetic resonance (NMR) measurement on a C36 solid and suggested that the C36 molecule has D6h symmetry. In 2000, Koshio etc.[2, 3] reported the syntheses of a number of compounds of C36, i.e., C36H4, C36H6, C3…