• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Hale.ICNAA.paper14
Hale.ICNAA.paper14

... Abstract. Computer simulations of atomic and molecular systems relevant to the prediction of nucleation rates have focused primarily on two approaches: (1) calculation of the free energy of formation of the critical embryo (or equivalently n-cluster probability ratios); and (2) time dependent simula ...
Antitu mor properties of cisplatin  and titanium(IV) complexes '
Antitu mor properties of cisplatin and titanium(IV) complexes '

... • two labile ligands - The labile groups must be readily replaced by water to be active. Too labile ligands lead to increased toxicity and too stable ligands lead to inactivity. • two non-labile groups - The nature of the amine ligands has an influence on the antitumor activity and toxicity of t ...
A computational study of CH4 storage in porous
A computational study of CH4 storage in porous

... site's concentration or the MOF environment, which represents the number of CH4 molecules that are desorbed from the metalsite as pressure swings from high to low. Since the metal site can be occupied by several CH4 molecules, the term “site occupancy” is used to describe adsorption on the metal sit ...
Metal–organic frameworks: a new class of porous materials
Metal–organic frameworks: a new class of porous materials

... clusters or coordination spheres that are linked together by the (typically linear) organic components to form the product framework. Examples of some SBUs that are commonly encountered in metal carboxylate MOFs are illustrated in Fig. 1. Although many of these units have been observed in molecular ...
Metal–organic frameworks: a new class of porous
Metal–organic frameworks: a new class of porous

... clusters or coordination spheres that are linked together by the (typically linear) organic components to form the product framework. Examples of some SBUs that are commonly encountered in metal carboxylate MOFs are illustrated in Fig. 1. Although many of these units have been observed in molecular ...
Monte Carlo Calculations for Alcohols and Their Mixtures with
Monte Carlo Calculations for Alcohols and Their Mixtures with

... tail on the electronic structure of the hydroxyl group. It is wellknown that gas-phase dipole moments differ among the alcohols (e.g., decrease with increasing chain length for the primary alcohols).38 Furthermore, using fixed charges ignores manybody polarization effects.31,39 A polarizable model, ...
IUPAC Provisional Recommendations
IUPAC Provisional Recommendations

... purposes, and two or more methods often evolved for naming a given compound belonging to a given class. Each name might have value in a specific situation, or be preferred by some users, but there was then the possibility of confusion. ...
Molecular structure and reactivity of the Group V metal oxides
Molecular structure and reactivity of the Group V metal oxides

... Bulk V2 O5 reduction initiated at ∼600 ◦ C and reduction occurred in three stages at ∼675 ◦ C (V2 O5 → V6 O13 ), ∼705 ◦ C (V6 O13 → V2 O4 ) and ∼780 ◦ C (V2 O4 → V2 O3 ). Bulk Nb2 O5 reduction initiated at ∼800 ◦ C and only very mild reduction occurred since temperatures of ∼1300 ◦ C are needed to r ...
Understanding Microstructural Evolution in Mixed Metal
Understanding Microstructural Evolution in Mixed Metal

... gelation time is 60 days in the case of an hydrolysis ratio of 10 and 35 days in the case with an hydrolysis ratio of 35. On the other hand, the gelation time of TEOS was increased from 35 days to 60 days for an increase of hydrolysis ratio from 4 to 10. This clearly suggests that particle growth an ...
On the composition of ammonia–sulfuric
On the composition of ammonia–sulfuric

... mass spectrometer, as they initially formed from gas-phase NH3 and H2 SO4 , and then grew to larger clusters containing more than 50 molecules of NH3 and H2 SO4 , corresponding to mobility-equivalent diameters greater than 2 nm. Water molecules evaporate from these clusters during sampling and are n ...
Clusters: Structure, Energetics, and Dynamics of Intermediate States
Clusters: Structure, Energetics, and Dynamics of Intermediate States

... protonated species, parent ions of the original molecular nature, and a variety of metal ions could be produced and investigated. Mixed clusters were soon studied, and extensive data are now available on the solvation of mixed molecular and protonated complexes, in addition to the aforementioned spe ...
The coordination chemistry of pyridyl oximes
The coordination chemistry of pyridyl oximes

... ligands containing more pyridyl and/or oxime groups. The coordination chemistry of twenty-three such ligands is described, including 2-acetylpyridine N-oxide oxime (which strictly speaking is not a pyridyl oxime) and of four polydentate ligands containing pyridyl groups that are not directly attache ...
General Introduction.
General Introduction.

... The polarity of the M-C bond varies strongly. Not only the metal (nature and valence state) but also the ligand surroundings influence the polarity dramatically. In addition to electronic factors, the reactivity of the metal center is strongly determined by the steric aspects of the total ligand set ...
Inorganic Structural Chemistry
Inorganic Structural Chemistry

... present inorganic structural chemistry in this way. Compromises cannot be avoided; some sections may be shorter, while others may be longer than some experts in this area may deem appropriate. Chemists predominantly think in illustrative models: they like to “see” structures and bonds. Modern bond t ...
Coordination Chemistry and Ligand Exchange reactions in the
Coordination Chemistry and Ligand Exchange reactions in the

... According to Wener, in co-ordination compounds, the central metal atoms exhibit primary and secondary valencies. 1. The primary valency is ionizable. Secondary valency is not ionizable. - The primary valency corresponds to the oxidation state - The secondary valency corresponds to the coordination n ...
Vibrational signatures of Hydrogen bonding in the protonated
Vibrational signatures of Hydrogen bonding in the protonated

... For n>1 only frequencies above 2000 cm-1 have been reported in Ref. 20. An effective onedimensional model for the assignment of the νz vibration of N2H7+ has been put forward by Asada et al.9. Their value of 707 cm-1, however, is at variance with the more sophisticated 4D quantum simulation12 which ...
Microsoft Word
Microsoft Word

... dispersion, (ii) enlarging oxygen storage capacity of the catalyst and (iv) high thermal stability. To better understand the catalytic nature of supported Pd catalysts, an in-depth study of their surface chemistry would be necessary. The supported metal systems are usually characterized by several ...
Ch. 13 EDTA Titrations
Ch. 13 EDTA Titrations

... The indicator must bind less strongly than EDTA ...
What is Analytical Chemistry?
What is Analytical Chemistry?

... • The indicator must bind less strongly than EDTA ...
013-IC-2008-47-11228..
013-IC-2008-47-11228..

... ligands that favor the orthogonal angles required for substrate binding and in one case an anionic bis-carboxamide, tristhiolate N2S3 coordination sphere possibly matching that of the yet-to-be characterized unmodified form of NHase. In order to determine how anionic charge build up influences subst ...
PDF file - Comp Chem - University of Minnesota Twin Cities
PDF file - Comp Chem - University of Minnesota Twin Cities

... with highest accuracy. NP-A includes an accurate two-body potential plus additional terms to account for screening (the interaction between atoms A and B is screened by the presence of atom C) and coordination numbers (other factors being equal, the binding energy per ligand becomes smaller as the n ...
Stabilization and Reactivity of Low Oxidation State Indium Compounds
Stabilization and Reactivity of Low Oxidation State Indium Compounds

... triflate, InOTf). This salt is significantly more stable than its halide counterparts, however it is sometimes too inert and does not react at all. It has been previously reported that the addition of crown ether ligands increase the reactivity of the metal centre and can cause oxidative addition in ...
Association of Nitrate Ion with Metal Cations in Aqueous Solution: a
Association of Nitrate Ion with Metal Cations in Aqueous Solution: a

... Abstract. Ion association in aqueous solutions of varied concentrations of LiNO3 , NaNO3 , Ca(NO3 ) 2 , Sr(NO3 ) 2 , Ba(NO3 ) 2 , Mn(NO3 )2 , Co(NO3 ) 2 , Ni(NO3 ) 2 , Cu(NO3 ) 2 , Zn(NO3 ) 2 , and Cd(NO3 ) 2 was studied by means of UV spectrometry. In all cases, except for Zn(NO 3 ) 2 (aq), the pri ...
CO2 Binding and Induced Structural Collapse of a Surface
CO2 Binding and Induced Structural Collapse of a Surface

... of monodentate axial carboxylate binding and other irregular low symmetry or distorted network nodes (see Figure 2a). Despite the absence of strict periodicity, the network grows continuously over the substrate area.31 The MOCN is further characterized by an appreciable temperature stability up to 4 ...
pdf - 283KB
pdf - 283KB

... (a) To enclose sets of identical groups of atoms (the entity may be an ion, substituent group, or molecule). Usually a multiplicative subscript follows the closing parenthesis. In the case of common ions such as nitrate and sulfate parentheses are recommended but not mandatory. ...
< 1 2 3 4 5 6 ... 33 >

Cluster chemistry

In chemistry, a cluster is an ensemble of bound atoms or molecules that is intermediate in size between a molecule and a bulk solid. Clusters exist of diverse stoichiometries and nuclearities. For example, carbon and boron atoms form fullerene and borane clusters, respectively. Transition metals and main group elements form especially robust clusters. Clusters can also consist solely of a certain kind of molecules, such as water clusters.The phrase cluster was coined by F.A. Cotton in the early 1960s to refer to compounds containing metal–metal bonds. In another definition a cluster compound contains a group of two or more metal atoms where direct and substantial metal bonding is present. The prefixed terms ""nuclear"" and ""metallic"" are used and imply different meanings. For example, polynuclear refers to a cluster with more than one metal atom, regardless of the elemental identities. Heteronuclear refers to a cluster with at least two different metal elements.The main cluster types are ""naked"" clusters (without stabilizing ligands) and those with ligands. For transition metal clusters, typical stabilizing ligands include carbon monoxide, halides, isocyanides, alkenes, and hydrides. For main group elements, typical clusters are stabilized by hydride ligands.Transition metal clusters are frequently composed of refractory metal atoms. In general metal centers with extended d-orbitals form stable clusters because of favorable overlap of valence orbitals. Thus, metals with a low oxidation state for the later metals and mid-oxidation states for the early metals tend to form stable clusters. Polynuclear metal carbonyls are generally found in late transition metals with low formal oxidation states. The polyhedral skeletal electron pair theory or Wade's electron counting rules predict trends in the stability and structures of many metal clusters. Jemmis mno rules have provided additional insight into the relative stability of metal clusters.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report