Nitrogen Fixation by Transition Metals: A Review
... conditions. Transition metals have partially filled ‘d’ subshell, which can give rise to cations with an incomplete ‘d’ subshell. Several metals from transition metals family were used to design the dinitrogen complexes which contain dinitrogen (N 2) as a ligand. These ligands act as catalysts and c ...
... conditions. Transition metals have partially filled ‘d’ subshell, which can give rise to cations with an incomplete ‘d’ subshell. Several metals from transition metals family were used to design the dinitrogen complexes which contain dinitrogen (N 2) as a ligand. These ligands act as catalysts and c ...
Carbonyl-phosphine hetero-ligated half-metallocene iron(II
... terminal (BBBC–X) so as to trigger its homolysis into a carboncentered growth-active radical (I or BBBC) by one-electron oxidation from Mtn to Mtn+1. These growing species propagate with monomers, and the oxidized catalyst sooner or later donates back its halogen X to the radical, to regenerate th ...
... terminal (BBBC–X) so as to trigger its homolysis into a carboncentered growth-active radical (I or BBBC) by one-electron oxidation from Mtn to Mtn+1. These growing species propagate with monomers, and the oxidized catalyst sooner or later donates back its halogen X to the radical, to regenerate th ...
Organomet-2009-Hartinger (pdf, 785 KiB) - Infoscience
... the cytotoxicity, due to rapid formation of the same aquation product for all evaluated compounds. Furthermore, nearly identical activity was observed when varying the arene ligand from p-cymene to biphenyl. However, the number of metal centers was found to be important, with the dinuclear compound ...
... the cytotoxicity, due to rapid formation of the same aquation product for all evaluated compounds. Furthermore, nearly identical activity was observed when varying the arene ligand from p-cymene to biphenyl. However, the number of metal centers was found to be important, with the dinuclear compound ...
CHAPTER 6 M(PH ) EXOHEDRAL
... complex revealed a slight preference for the second addition to occur at the opposite 6:6 C−C bond. It was also experimentally corroborated for the double addition of iridium compounds.12 The hexaaddition derivatives of platinum and palladium have almost Th symmetry, each one of the metals being bou ...
... complex revealed a slight preference for the second addition to occur at the opposite 6:6 C−C bond. It was also experimentally corroborated for the double addition of iridium compounds.12 The hexaaddition derivatives of platinum and palladium have almost Th symmetry, each one of the metals being bou ...
5.New functional coordination compounds
... d-orbit energy level splitting (1) spherical symmetry field Due to the negative charge of ligands distributed spherically, no matter where d-orbit is, the repulsive interaction of the negative charge is the same, although of the d-orbital energy increases, still keep quintet degenerate d-orbitals. ...
... d-orbit energy level splitting (1) spherical symmetry field Due to the negative charge of ligands distributed spherically, no matter where d-orbit is, the repulsive interaction of the negative charge is the same, although of the d-orbital energy increases, still keep quintet degenerate d-orbitals. ...
Review of selective separations of cobalt, uranium, zinc, nickel and
... environmental impact, either marketable products of high added value or pure products that can be reused or disposed of in an environmentally safe manner. The high selectivity, high loading capacities and rapid loading and release kinetics of SuperLig® products result in substantially lower capital ...
... environmental impact, either marketable products of high added value or pure products that can be reused or disposed of in an environmentally safe manner. The high selectivity, high loading capacities and rapid loading and release kinetics of SuperLig® products result in substantially lower capital ...
CARBON-HYDROGEN-TRANSITION METAL BONDS
... role or play an energetically significant part in ground states or in reaction intermediates. In this article we review recent observations which show that there are in fact many circumstances in which a carbon-hydrogen group will interact with a transition metal centre with formation of a two-elect ...
... role or play an energetically significant part in ground states or in reaction intermediates. In this article we review recent observations which show that there are in fact many circumstances in which a carbon-hydrogen group will interact with a transition metal centre with formation of a two-elect ...
n - KOCW
... Hydrophobic 3,6-diiodobenzenes 2-4 were prepared by deprotonation of diol 1 and subsequent nucleophilic attack on 1-bromohexane, 1-bromododecane, and 1-bromooctadecane, respectively, in 85-96% yield. - Hydrophilic analogues 5-7 were similarly prepared through a reaction of 1 with monomethylated and ...
... Hydrophobic 3,6-diiodobenzenes 2-4 were prepared by deprotonation of diol 1 and subsequent nucleophilic attack on 1-bromohexane, 1-bromododecane, and 1-bromooctadecane, respectively, in 85-96% yield. - Hydrophilic analogues 5-7 were similarly prepared through a reaction of 1 with monomethylated and ...
Full text - SG
... opposite charges, the electrostatic interaction is attractive (Eionic < 0) in the [ML(X)] complexes. Molecular orbital (MO) compositions and the overlap populations between molecular fragments were calculated using the AOMix program.37,38 Atomic charges and spin densities were calculated using the M ...
... opposite charges, the electrostatic interaction is attractive (Eionic < 0) in the [ML(X)] complexes. Molecular orbital (MO) compositions and the overlap populations between molecular fragments were calculated using the AOMix program.37,38 Atomic charges and spin densities were calculated using the M ...
Small Reactive Sulfur-Nitrogen Compounds and Their Transition
... under normal conditions, and indirect methods are required to build the thionitrosyl ligand within the coordination sphere, e.g., by sulfurization of nitrido-metal complexes or by halide abstraction from either thiazyl fluoride or thiazyl chloride complexes. In most cases N3S3Cl,, and occasionally S ...
... under normal conditions, and indirect methods are required to build the thionitrosyl ligand within the coordination sphere, e.g., by sulfurization of nitrido-metal complexes or by halide abstraction from either thiazyl fluoride or thiazyl chloride complexes. In most cases N3S3Cl,, and occasionally S ...
- Opus
... Thallium (I) coordination is based on a quite different type of metal-ligand interaction: Owing to the relativistically contracted valence shell and the low electrical charge, the Tl+ cation is intermediate in character between standard hard and soft cations and has an affinity for both hard and sof ...
... Thallium (I) coordination is based on a quite different type of metal-ligand interaction: Owing to the relativistically contracted valence shell and the low electrical charge, the Tl+ cation is intermediate in character between standard hard and soft cations and has an affinity for both hard and sof ...
The Trans Effect. Implications in Enantioselective
... ❑ Groups A and NH3 both occupy part of the 6py and 6pz orbitals. ❑ L is orthogonal to the 6pz orbital, but it overlaps well with the 6py orbital. ❑ Stabilization of the transition state is achieved by increased donation ligand (L) into 6py orbital in ≠. ❑ Calculations for trigonal bipyamidal complex ...
... ❑ Groups A and NH3 both occupy part of the 6py and 6pz orbitals. ❑ L is orthogonal to the 6pz orbital, but it overlaps well with the 6py orbital. ❑ Stabilization of the transition state is achieved by increased donation ligand (L) into 6py orbital in ≠. ❑ Calculations for trigonal bipyamidal complex ...
Precipitation titration
... These values refers to that the first two protons are lost much more readily than the remaining two . ...
... These values refers to that the first two protons are lost much more readily than the remaining two . ...
Fp*) Fe(η5-C5Me5)(CO)2
... and 1.36 Å, respectively. Although the CtC lengths are comparable to those in 5 and 6, the C-C distances are slightly shorter than those in 6 (by 0.03 Å). In contrast to the similarity in the (CtC)n parts, the Fe-C lengths of 1 (averaged value: 1.88 Å) are substantially shorter than those in 5 and 6 ...
... and 1.36 Å, respectively. Although the CtC lengths are comparable to those in 5 and 6, the C-C distances are slightly shorter than those in 6 (by 0.03 Å). In contrast to the similarity in the (CtC)n parts, the Fe-C lengths of 1 (averaged value: 1.88 Å) are substantially shorter than those in 5 and 6 ...
Liquid chromatography: a tool for the analysis of metal species
... based on anionic exchange offers the potential of different selectivity, reduced problems for metal ion hydrolysis and can be applied to complex sample matrices. Notwithstanding the fact that many organic acids (from mono-, di-, tricarboxylic acids to chelating agents such as a-hydroxyisobutyric aci ...
... based on anionic exchange offers the potential of different selectivity, reduced problems for metal ion hydrolysis and can be applied to complex sample matrices. Notwithstanding the fact that many organic acids (from mono-, di-, tricarboxylic acids to chelating agents such as a-hydroxyisobutyric aci ...
Disproportionation of Gold(II)
... with chloride and neutral ligands. The Au2+ atomic ion is stable to disproportionation, but the barrier is more than halved to 119 kcal/mol in an aqueous environment vs 283 kcal/mol in the gas phase. For dissociative disproportionation of chloride complexes, the loss of chlorine, either as an atom ( ...
... with chloride and neutral ligands. The Au2+ atomic ion is stable to disproportionation, but the barrier is more than halved to 119 kcal/mol in an aqueous environment vs 283 kcal/mol in the gas phase. For dissociative disproportionation of chloride complexes, the loss of chlorine, either as an atom ( ...
Organometallic synthesis, reactivity and catalysis in the solid state
... yields of products and the attenuation of decomposition pathways allowing for products that might be kinetically unstable in solution to be observed in the solid state. Heterogeneous catalysis using the surfaces of metals or ionic platform materials is a wellresearched area of chemistry with many in ...
... yields of products and the attenuation of decomposition pathways allowing for products that might be kinetically unstable in solution to be observed in the solid state. Heterogeneous catalysis using the surfaces of metals or ionic platform materials is a wellresearched area of chemistry with many in ...
363. - Wayne State Chemistry
... MLCT excited states and not with vibronic contributions of their ancillary ligands. In contrast, the vibronic sidebands are not resolved in the 77 K emission spectrum of [Ru(acac)2bpy], and the spectral band shapes of the [Ru(tetraam(m)ine)bpy]2+ complexes25 fall between these limits (Figure 2). 2. ...
... MLCT excited states and not with vibronic contributions of their ancillary ligands. In contrast, the vibronic sidebands are not resolved in the 77 K emission spectrum of [Ru(acac)2bpy], and the spectral band shapes of the [Ru(tetraam(m)ine)bpy]2+ complexes25 fall between these limits (Figure 2). 2. ...
Metalloid Al- and Ga-clusters: a novel dimension in organometallic
... this process of the formation and breaking of metal–metal bonds (MM) are mostly unknown. This fundamental process and molecular intermediates exhibiting MM bonding are therefore central to this contribution. These molecular intermediates are mostly addressed as metal atom clusters.1 However, since t ...
... this process of the formation and breaking of metal–metal bonds (MM) are mostly unknown. This fundamental process and molecular intermediates exhibiting MM bonding are therefore central to this contribution. These molecular intermediates are mostly addressed as metal atom clusters.1 However, since t ...
Density Functional Theory Study of the Interaction of 2
... observe that the latest orbital 5s0 is free of electrons and it can accept two electrons, which can be provided by the free electronic doublet of deprotonated nitrogen atom of 2MBI molecule. This is in order to allow to Pd atom to have the stable configuration as [Kr]4d105s2. This is why after the o ...
... observe that the latest orbital 5s0 is free of electrons and it can accept two electrons, which can be provided by the free electronic doublet of deprotonated nitrogen atom of 2MBI molecule. This is in order to allow to Pd atom to have the stable configuration as [Kr]4d105s2. This is why after the o ...
Copper di-imine complexes: Structures and catalytic activity
... 3.2 Copper Copper on its oxidation state I has a d10 electron configuration. In aqueous solutions, only a low concentration of Cu(I) ions can exist, as they are easily oxidised to Cu(II). When complexed with chelating ligands, a favourable geometry around the copper atom can stabilise the complex co ...
... 3.2 Copper Copper on its oxidation state I has a d10 electron configuration. In aqueous solutions, only a low concentration of Cu(I) ions can exist, as they are easily oxidised to Cu(II). When complexed with chelating ligands, a favourable geometry around the copper atom can stabilise the complex co ...
Experiment 13
... of copper nitrate solution to a tiny test tube and then 5 drops of a solution that contains the anion (or NH3) needed for the first copper-containing substance. Now add 5 drops of a second solution that contains the anion needed for the second copper-containing substance. Record what happens in your ...
... of copper nitrate solution to a tiny test tube and then 5 drops of a solution that contains the anion (or NH3) needed for the first copper-containing substance. Now add 5 drops of a second solution that contains the anion needed for the second copper-containing substance. Record what happens in your ...
DA-00-Crypt-CPla1 (PDF, 216 KiB)
... contains a DyN4O5 core with the metal ion asymmetrically placed at one end of the cavity of the macrobicyclic receptor and bound to seven of the eleven heteroatoms of the ligand [three imino-nitrogen atoms, N(1), N(3), N(4), one of the bridgehead nitrogen atoms, N(2), and the three phenolic oxygen a ...
... contains a DyN4O5 core with the metal ion asymmetrically placed at one end of the cavity of the macrobicyclic receptor and bound to seven of the eleven heteroatoms of the ligand [three imino-nitrogen atoms, N(1), N(3), N(4), one of the bridgehead nitrogen atoms, N(2), and the three phenolic oxygen a ...
Transition Metal Chemistry - Site title
... the PowerLecture disc inserted in your computer. Also, for the mathematical symbols to display properly, you must install the supplied font called “Symb_chm,” supplied as a cross-platform TrueType font in the “Font_for_Lectures” folder in the "Media" folder on this disc. If you prefer to customize t ...
... the PowerLecture disc inserted in your computer. Also, for the mathematical symbols to display properly, you must install the supplied font called “Symb_chm,” supplied as a cross-platform TrueType font in the “Font_for_Lectures” folder in the "Media" folder on this disc. If you prefer to customize t ...
Growth of Platinum Clusters in Solution and on Biopolymers: The
... entirely, mainly, or at least to a significant extent, by bonds directly between the metal atoms, even though some nonmetal atoms may also be intimately associated with the cluster. This definition states that a group of atom can be classified as a cluster only in the presence of at least one direct ...
... entirely, mainly, or at least to a significant extent, by bonds directly between the metal atoms, even though some nonmetal atoms may also be intimately associated with the cluster. This definition states that a group of atom can be classified as a cluster only in the presence of at least one direct ...
Ligand
In coordination chemistry, a ligand (/lɪɡənd/) is an ion or molecule (functional group) that binds to a central metal atom to form a coordination complex. The bonding between metal and ligand generally involves formal donation of one or more of the ligand's electron pairs. The nature of metal-ligand bonding can range from covalent to ionic. Furthermore, the metal-ligand bond order can range from one to three. Ligands are viewed as Lewis bases, although rare cases are known to involve Lewis acidic ""ligand.""Metals and metalloids are bound to ligands in virtually all circumstances, although gaseous ""naked"" metal ions can be generated in high vacuum. Ligands in a complex dictate the reactivity of the central atom, including ligand substitution rates, the reactivity of the ligands themselves, and redox. Ligand selection is a critical consideration in many practical areas, including bioinorganic and medicinal chemistry, homogeneous catalysis, and environmental chemistry.Ligands are classified in many ways like : their charge, their size (bulk), the identity of the coordinating atom(s), and the number of electrons donated to the metal (denticity or hapticity). The size of a ligand is indicated by its cone angle.