We explore a new approach by introducing heterobinuclear organometallic compounds for linking catalytic functions to zeolite frameworks. With two different metals present, the complexes are being anchored to the support via one oxophilic metal, ligand exc...

... pentaamminecobalt (III) anchored to mercury, gold, or copper electrodes via various thiophenecarboxylate ligands where the thiophene sulfur acts ...

This project deals with the covalent anchoring of various derivatives of triazacyclononane (TACN)ligands in the channels of period mesoporous materials and the catalytic activity of the corresponding metal complexes. Catalyst preparation, ligand immobilization, catalyst characterization, and catalyst performance in ...

Substitutionally inert metal-containing compounds provide new opportunities as structurally diverse and unique scaffolds for the design of protein binders. This review cites progress in this area by highlighting the use of metal complexes, including truly organometallic compounds, as inhibitors for enzymes of biological interest, such as esterases, ...

The chemistry of formation of iridium clusters from mononuclear iridium diethylene complexes anchored in dealuminated Y zeolite, and their subsequent breakup -- all including changes in the metal-metal, metal-support, and metal-ligand interactions -- is demonstrated by time-resolved EXAFS, XANES, and IR ...

Achievements are reported for the following 4 areas: {pi}/{sigma} equillibria in aldehyde and ketone complexes; thermodynamic ligand binding affinities ({alpha},{beta} unsaturated organic carbonyl compounds); (a new form of coordinated carbon) an unsupported C{sub 3} chain that spans two different transition metals; and (a new form of coordinated carbon) ...

Whereas the directed evolution of stereoselective enzymes provides a useful tool in asymmetric catalysis, generality cannot be claimed because enzymes as catalysts are restricted to a limited set of reaction types. Therefore, a new concept has been proposed, namely directed evolution of hybrid catalysts in which proteins serve as hosts for anchoring ...

... j JSHEET METAL ANCHOR CONE ... 1. The set-up time, jetting time, brerikdown time* for each i Ianchor, and slurry injection time for the four anchors. ...

The role of o-bisguanidinobenzenes (BGBs) as new Br�nsted base ligands for arsenic and phosphoric acids was examined. In solution state, complexation was evaluated by Job's plot in (1)H NMR experiment, indicating a 1:1 complex formation, whereas in solid state crystalline structures of complexes obtained were addressed by X-ray crystallographic analysis and/or solid state ...

Unimolecular rate constants are reported for the reduction of pentaamminecobalt (III) anchored to mercury or gold electrodes via thiocarboxylate bridging ligands having the general form RSCH2COO (-). Since the carboxylate is bound to Co(III) and sulfur pr...

In recent years, N-heterocyclic carbenes (NHC) have proved to be a versatile class of spectator ligands in homogeneous catalysis. Being robust anchoring functions for late transition metals, their ligand donor capacity and their molecular shape is readily modified by variation of the substituents at the N-atoms and ...

Carbon nanotubes (CNTs) were covalently modified by fluorescence ligand (glycine-N-8-quinolylamide) and formed a hybrid material which could be used as a selective probe for metal ions detection. The anchoring to the surface of the CNTs was carried out by the reaction between the precursor and the carboxyl groups available on the ...

This research program is directed toward developing a fundamental understanding of how catalyst composition, redox ability, and structure control the catalytic properties of metal oxides. Oxide systems that permit examination of the role of metal oxide cations separately and in pairwise combinations are being developed. Organometallic complexes containing ...

A new family of ligands for the surface functionalization of CdSe nanocrystals is proposed, namely alkyl or aryl derivatives of carbodithioic acids (R-C(S)SH). The main advantages of these new ligands are as follows: they nearly quantitatively exchange the initial surface ligands (TOPO) in very mild conditions; they significantly ...

A ligand system containing three preorganized carbamoylmethylphosphine oxide (CMPO) moieties anchored onto a rigid C(3)-symmetric triphenoxymethane platform has been developed for facile metal complexation and subsequent extraction from aqueous acidic nuclear waste streams. Intended to mimic the 3:1 CMPO-actinide stoichiometry of the ...

Reactions of GaCl(3) with pyrazole-containing ligands of the pyrazole-imine-phenol (HL(1)-HL(3)) or pyrazole-amine-phenol (HL(4)-HL(6)) types led to the synthesis of well-defined [GaL(2)](+) homoleptic complexes (1-6). Complexes 1-6 were characterized by elemental analysis, ESI-MS (electrospray ionization-mass spectrometry), IR and NMR spectroscopies, and in the case of ...

anchors are made from Invar, and a hole is tapped into them to allow a triangular ... We decided to make the anchors from Invar, a very low expansion metal. ...

The solution structures of apo, Cu(I), and Ni(II) human Sco1 have been determined. The protein passes from an open and conformationally mobile state to a closed and rigid conformation upon metal binding as shown by electrospray ionization MS and NMR data. The metal ligands of Cu(I) are two Cys residues of the CPXXCP motif and a His ...

Page 1. Metal-Complexing Ligands And Metal Speciation In Sediment Porewaters: Implications For Sediment/Water Exchange And Water Column ...

... Title : Metal-Complexing Ligands and Metal Speciation in Sediment Porewaters: Implications for Sediment/Water Exchange and Water Column ...

... Title : Metal-Complexing Ligands and Metal Speciation in Sediment Pore Waters: Implications for Sediment/Water Exchange and Water Column ...

... Accession Number : ADA416316. Title : Metal Solvation and Novel Metal-Ligand Interactions in Gas Phase Clusters. Descriptive Note : Final rept. ...

The experimental material on the reactions of coordinated halide ligands, as well as cyanide, azido, thiocyanato, and cyanato ligands, in transition-metal complexes has been generalized in this review.

We examine the suitability of metal-containing polystyrene beads for the calibration of a mass cytometer instrument, a single particle analyser based on an inductively coupled plasma ion source and a time of flight mass spectrometer. These metal-containing beads are also verified for their use as internal standards for this instrument. These beads were ...

The surface chemistry of the two germylene complexes Cl{sub 2}(THF)GeM(CO){sub 5} (M = Mo (1) and W (2)) in zeolite Y was studied with X-ray absorption spectroscopy (Ge, Mo, W edge EXAFS) and in situ FTIR/TPD-MS techniques. The molybdenum complex 1 interacts with the framework of Na-Y zeolite at room temperature where decarbonylation occurs to a small extent. The intrazeolite 1 retains the Ge-Mo ...

The synthesis of intrazeolite anchoring of [HRuCo3(CO)9(?2-CO)3] involves the adsorption of metal carbonyl species into zeolite cages followed by reductive carbonylation under a mixed CO and H2 atmosphere. The physicochemical characterization of the samples was based on a multianalytical approach, including Fourier transform-infrared, extended x-ray ...

All ligands of the epidermal growth factor receptor (EGFR) are synthesized as membrane-anchored precursors. Previous work has suggested that some ligands, such as EGF, must be proteolytically released to be active, whereas others, such as heparin binding EGF-like growth factor (HB-EGF) can function while still ...

Methods used by the Florida Department of Transportation for predicting corrosion rates of metallic piling, anchors, and metallic drainage pipe used in highway construction were examined and updates were proposed as needed. Pile and anchor procedures were...

All present approaches to surface modification of nanoparticles (NPs) with organic ligands exploit metal (cadmium) sites as anchor points. To obtain efficient interaction of NP surface with p-orbitals of organic chromophores, we utilize the chalcogen (sulfur) sites on the NP surface. These sites present several advantages stemming from ...

The Broad, long term objective of the research plan is to develop exquisitely selective polypeptide metal chelators for the remediation of aqueous systems. A variety of polypeptide chelators will be developed and optimized ranging from antibodies to small peptides. Then, through unique molecular engineering approaches developed in our laboratories, the polypeptide chelators ...

Proteins can make use of metal ions to bind substrates, to maintain structure, to effect catalysis, and for allosteric control and regulation. In order to hold a particular metal ion with high affinity and specificity, proteins form multidentate binding pockets designed to fulfill both the chemical and geometric bonding requirements of that ...

Three distinct wet chemistry recipes were applied to hydrogen-terminated n- and p-Si(100) surfaces in a comparative study of the covalent grafting of two differently substituted 2,2'-bipyridines. The applied reactions require the use of heat, or visible light under a controlled atmosphere, or a suitable potential in an electrochemical cell. In this last case, hydrogen-terminated silicon is the ...

One aspect of the present invention relates to novel ligands for transition metals. A second aspect of the present invention relates to the use of catalysts comprising these ligands in transition metal-catalyzed carbon-heteroatom and carbon-carbon bond-fo...

Late expression factor 4 (LEF4) is one of the four identified subunits of Autographa californica nucleopolyhedrosis virus (AcNPV) encoded RNA polymerase that carries out transcription from viral late and very late promoters. This 464-amino acid baculovirus-encoded protein also harbors 5' mRNA capping activity that includes RNA 5' triphosphatase, nucleoside triphosphatase, and guanylyltransferase ...

Two porous materials, one ceramic and one metal, have been fabricated into cylindrical dental anchors and implanted into the mandibles of miniature swine. The ceramic alumina porcelain was formed by special slipcasting and firing techniques. The metal anc...

New functionalized polypyrrole films containing transition metal complexes have been prepared and studied. The strategy is based on the three-dimensional template effect of a metal center (Cu{sup 1}, Co{sup II}, Zn{sup II}, Ag{sup I}) able to entwine two end-functionalized chelating ligands before polymerization. The ...

The following are reported: tertiary amine metathesis catalysis by metal carbonyl clusters containing carbene ligands, studies of the synthesis and transformations of carbene ligands in cluster complexes, transformations of hydrocarbyl ligands bonded to s...

A method of separating a mixture of carbon dioxiode and hydrocarbon gas using a mixed-ligand, metal-organic framework (MOF) material having metal ions coordinated to carboxylate ligands and pyridyl ligands.

bunched ceramic fibers with meta? er metaileceramic cdacngs . ... and an anchor for attachment of che ber to the metal structure by brazing. ...

Accurate calculations on the bond length, dipole moment, and harmonic frequency of CO are presented,

This paper describes interactions between metal complexes and self-assemblies of covalently bound ligand monolayers on surfaces. Covalently bound molecular self-assemblies of (3-cyanopropyl)trichlorosilane (CPTS) were anchored on the surfaces of fused quartz and the native oxide of the [l angle]100[r angle] crystallographic orientation ...

The oriented assembly of molecules on metals is a requirement for rectification in planar metal-molecule-metal junctions. Here, we demonstrate how the difference in adsorption kinetics between dithiocarbamate and thioacetate anchor groups can be utilized to form oriented assemblies of asymmetric molecules that are bound to Au through ...

... Accession Number : ADA317459. Title : Main Group Compounds as Amphoteric Ligands to Transition Metals. Synthesis ...

The subject matter of the invention relates to bifunctional cyclohexyl DTPA ligands and methods of using these compounds. Specifically, such ligands are useful for radiolabeling proteins with radioactive metals, and can consequently be utilized with respe...

A method for dissociating metal-ligand complexes in a supercritical fluid by treating the metal-ligand complex with heat and/or reducing or oxidizing agents is described. Once the metal-ligand complex is dissociated, the resulting metal and/or metal oxide form fine particles of substantially ...

We have continued to make progress in preparing transition metal complexes containing fluorinated ligands, and have completed several sub-projects. We have prepared the first examples of transition metal compounds containing tetrafluoroethylene ligands th...

This progress report covers: tertiary amine metathesis catalysis by metal carbonyl clusters containing carbene ligands; synthesis and transformations of carbene ligands in cluster complexes; and reactivity of mixed metal cluster compounds toward alkynes. ...

Structural analogies between polynuclear metal alkoxides and metal oxides have been noted, with the former providing models for subunits within the extended networks of the latter. An extensive organometallic chemistry supported by alkoxy ligands is emerg...

'The broad, long term objective of the research plan is to develop exquisitely selective polypeptide metal chelators for the remediation of aqueous systems. A variety of polypeptide chelators will be developed and optimized ranging from antibodies to small peptides. Then, through unique molecular engineering approaches developed in the laboratories, the polypeptide ...