Enantioselective Homogeneous Hydrogenation of Monosubstituted
... The activity of the different Rh-ligand complexes for the hydrogenation of the two furan derivatives 5 and 6 was investigated only brie¯y. Whereas 5 was reduced with high conversions with most ligands, this was mainly due to decomposition of the catalysts to black, heterogeneous Rh metal deposits an ...
... The activity of the different Rh-ligand complexes for the hydrogenation of the two furan derivatives 5 and 6 was investigated only brie¯y. Whereas 5 was reduced with high conversions with most ligands, this was mainly due to decomposition of the catalysts to black, heterogeneous Rh metal deposits an ...
Revision Y12 Chemistry PLC
... I know this Part 2 – Bonding & Structure (cont.) The shapes of simple molecules and ions (g) the shapes of, and bond angles in, molecules and ions with up to six electron pairs (including lone pairs) surrounding the central atom as predicted by electron pair repulsion, including the relative repuls ...
... I know this Part 2 – Bonding & Structure (cont.) The shapes of simple molecules and ions (g) the shapes of, and bond angles in, molecules and ions with up to six electron pairs (including lone pairs) surrounding the central atom as predicted by electron pair repulsion, including the relative repuls ...
Downloaded on 2017-02
... activation energy for proton transfer from the incoming H2 O molecule to the carbon of the remaining ligands is calculated (see SI Fig. 2). For the first incoming H2 O molecule in the H2 O pulse, Ea = 0.52 eV is required for its dissociation as it adsorbs (Table 1 reaction 5). Transfer of the proton ...
... activation energy for proton transfer from the incoming H2 O molecule to the carbon of the remaining ligands is calculated (see SI Fig. 2). For the first incoming H2 O molecule in the H2 O pulse, Ea = 0.52 eV is required for its dissociation as it adsorbs (Table 1 reaction 5). Transfer of the proton ...
Cd2+ and Zn2+ sorption on apatite in the presence of EDTA and
... Abstract. The sorption of Cd2+ and Zn2+ on hydroxyapatite [HAP- Ca10(PO4)6(OH)2] and fluorapatite [FAPCa10(PO4)6(F)2] with different specific surface area and stoichiometry was investigated in batch experiments in the pH range 4 to 11 (25 ◦C; 0.1 M KNO3). The impact of different conditions was conce ...
... Abstract. The sorption of Cd2+ and Zn2+ on hydroxyapatite [HAP- Ca10(PO4)6(OH)2] and fluorapatite [FAPCa10(PO4)6(F)2] with different specific surface area and stoichiometry was investigated in batch experiments in the pH range 4 to 11 (25 ◦C; 0.1 M KNO3). The impact of different conditions was conce ...
Arylboronates and Diarylborinates
... diffraction (Figure 1). In the solid state, 3b adopts a distorted squareplanar geometry with P-Rh-O(1) angles of 80.21(5), 87.37(5), and 175.24(5)° for P(1), P(2), and P(3), respectively. The O(12)-B(1)-C(19-25) plane lies approximately perpendicular to the rhodium coordination plane, and the dihedr ...
... diffraction (Figure 1). In the solid state, 3b adopts a distorted squareplanar geometry with P-Rh-O(1) angles of 80.21(5), 87.37(5), and 175.24(5)° for P(1), P(2), and P(3), respectively. The O(12)-B(1)-C(19-25) plane lies approximately perpendicular to the rhodium coordination plane, and the dihedr ...
University of Groningen Catalytic oxidations by vanadium
... [8]. In the native state, a five-coordinated trigonal bipyrimidal V(V) moiety is present which is coordinated by three nonprotein oxo groups in the equatorial plane and one histidine and a hydroxy group at the axial positions (Fig. 2). Two X-ray structures from the seaweed enzymes Corallina officina ...
... [8]. In the native state, a five-coordinated trigonal bipyrimidal V(V) moiety is present which is coordinated by three nonprotein oxo groups in the equatorial plane and one histidine and a hydroxy group at the axial positions (Fig. 2). Two X-ray structures from the seaweed enzymes Corallina officina ...
Chapter 2.4 Periodic properties of the elements
... Ionization energies measure how strongly electrons are bound to atoms. Ionization always requires energy to remove an electron from the attractive force of the nucleus. Low ionization energies indicate easy removal of electrons, and hence easy positive ion (cation) formation. ...
... Ionization energies measure how strongly electrons are bound to atoms. Ionization always requires energy to remove an electron from the attractive force of the nucleus. Low ionization energies indicate easy removal of electrons, and hence easy positive ion (cation) formation. ...
Nanocomposite of a chromium Prussian blue with TiO2
... reside in a very high energy d-orbital. As a result, incorporating TiIII into a PB should afford solids with high magnetic ordering temperatures because the one d-electron should delocalize significantly into the cyanide p* orbital. The high energy of the d-orbitals on titanium(III) ion means that it ...
... reside in a very high energy d-orbital. As a result, incorporating TiIII into a PB should afford solids with high magnetic ordering temperatures because the one d-electron should delocalize significantly into the cyanide p* orbital. The high energy of the d-orbitals on titanium(III) ion means that it ...
Chapter 2 - Chemistry
... Deductions from Dalton s Atomic Theory Explains: 1.) difference between element and compound 2.) Law of Mass Conservation - states that total mass remains constant during a chemical reaction 3.) Law of Definite Proportions - compound is type of matter containing atoms of two or more elements is defi ...
... Deductions from Dalton s Atomic Theory Explains: 1.) difference between element and compound 2.) Law of Mass Conservation - states that total mass remains constant during a chemical reaction 3.) Law of Definite Proportions - compound is type of matter containing atoms of two or more elements is defi ...
Analyst
... this pH, the amino acids are below their isoelectric points and the –NH3 group remains protonated giving an overall positive charge to the amino acid. The ionic interactions resulting under these conditions are responsible for complexation. Aqueous chemistry of Bi(III) being very versatile, it exhib ...
... this pH, the amino acids are below their isoelectric points and the –NH3 group remains protonated giving an overall positive charge to the amino acid. The ionic interactions resulting under these conditions are responsible for complexation. Aqueous chemistry of Bi(III) being very versatile, it exhib ...
Fragmentation of doubly charged metal–acetamide complexes
... and [M(L − H)(L)n−2 ]+ . These results will provide a more detailed picture of reactivity patterns. Collision-induced dissociation (CID) of [M(L)n ]2+ produces high abundances of [M(L − H)]+ by inter-ligand proton transfer, followed by loss of protonated acetamide, [L + H]+ . The [M(L − H)]+ ions ca ...
... and [M(L − H)(L)n−2 ]+ . These results will provide a more detailed picture of reactivity patterns. Collision-induced dissociation (CID) of [M(L)n ]2+ produces high abundances of [M(L − H)]+ by inter-ligand proton transfer, followed by loss of protonated acetamide, [L + H]+ . The [M(L − H)]+ ions ca ...
1-Three states of matter . A: density, volume and weight B: solid
... Non-polar molecular crystals are very soft and are soluble in non-polar solvents. Non-polar molecular crystals are formed from symmetrical molecules with covalent bonds between atoms with small electronegativity differences. ...
... Non-polar molecular crystals are very soft and are soluble in non-polar solvents. Non-polar molecular crystals are formed from symmetrical molecules with covalent bonds between atoms with small electronegativity differences. ...
Comments on Inorganic Chemistry, 2003, 24, 253
... metal centers.[18] There is evidence that electronic more than steric factors may influence the reactivities of the gold atoms in these compounds. In fact, except for complex 3, only one metal center appears to be oxidized to give mixed-valence Au2I=AuIII metallocycles. Surprisingly, aqua regia also ...
... metal centers.[18] There is evidence that electronic more than steric factors may influence the reactivities of the gold atoms in these compounds. In fact, except for complex 3, only one metal center appears to be oxidized to give mixed-valence Au2I=AuIII metallocycles. Surprisingly, aqua regia also ...
A-Frame Complexes of Dirhodium Bridged by Dicarbene and
... merely phosphine substitutes; they offer a useful steric alternative to phosphines in having a very different shape. While phosphines are often described as conical,5 NHC ligands are more planar, having a slimmer, less sterically hindered axis orthogonal to the bulky imidazole ring plane. The majori ...
... merely phosphine substitutes; they offer a useful steric alternative to phosphines in having a very different shape. While phosphines are often described as conical,5 NHC ligands are more planar, having a slimmer, less sterically hindered axis orthogonal to the bulky imidazole ring plane. The majori ...
AQA Additional Sci C2 Revision Guide
... outer shell of its atoms. Elements in groups 1 and 2 of the periodic table only have 1 or 2 electrons in their outer shells so these form positive ions by losing their outer electrons. Elements in groups 6 and 7 of the periodic table only need 1 or 2 electrons to fill up their outer shells so these ...
... outer shell of its atoms. Elements in groups 1 and 2 of the periodic table only have 1 or 2 electrons in their outer shells so these form positive ions by losing their outer electrons. Elements in groups 6 and 7 of the periodic table only need 1 or 2 electrons to fill up their outer shells so these ...
Introduction - University of Pretoria
... different methods: (i) transformation of a non-carbene ligand and (ii) addition of a carbene ligand precursor to a metal complex from pre-existing carbene complexes, of which five reactions are possible. They are (i) the transfer of a carbene ligand from one metal to another, (ii) modification of th ...
... different methods: (i) transformation of a non-carbene ligand and (ii) addition of a carbene ligand precursor to a metal complex from pre-existing carbene complexes, of which five reactions are possible. They are (i) the transfer of a carbene ligand from one metal to another, (ii) modification of th ...
Energy and Inorganic Chemistry
... For millennia, cheap solar fuel production from biomass has been the primary energy source on the planet; however the use of existing types of plants requires large land areas to meet a significant portion of primary energy demand. Inorganic chemistry has been involved in the design of solar fuels b ...
... For millennia, cheap solar fuel production from biomass has been the primary energy source on the planet; however the use of existing types of plants requires large land areas to meet a significant portion of primary energy demand. Inorganic chemistry has been involved in the design of solar fuels b ...
08_chapter 1
... Borate glasses: Boron trioxide is a significant component of glasses, enamels and glazes. It is very rarely added to the raw material mixtures in the form of oxide, more frequent use being made of H3BO3 or Na2B4O7. Boron oxide (B2O3) usually occurs in the glassy form which is virtually incapable of ...
... Borate glasses: Boron trioxide is a significant component of glasses, enamels and glazes. It is very rarely added to the raw material mixtures in the form of oxide, more frequent use being made of H3BO3 or Na2B4O7. Boron oxide (B2O3) usually occurs in the glassy form which is virtually incapable of ...
NMR Shifts in Paramagnetic Systems: A Nonmultipole Expansion
... In this paper we take gS to be equal to 2 exactly. Here rN is the radius vector of the electron about the nucleus with nuclear spin angular momentum I, as shown in Fig. 1. The system we consider is a d’ system in a strong crystal field of octahedral symmetry, where bonding effects have been incorpor ...
... In this paper we take gS to be equal to 2 exactly. Here rN is the radius vector of the electron about the nucleus with nuclear spin angular momentum I, as shown in Fig. 1. The system we consider is a d’ system in a strong crystal field of octahedral symmetry, where bonding effects have been incorpor ...
Coordination complex
In chemistry, a coordination complex or metal complex consists of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands or complexing agents. Many metal-containing compounds, especially those of transition metals, are coordination complexes.