(b) Costes, J - Nanyang Technological University
... As shown in Figure 3, complex 4 consists of a discrete trinuclear [Co2Gd(O2CCMe3)6(C9H7N)2(NO3)] molecule with a crystallographic C2 axis passing through the Gd and N(1) atoms. This molecule also contains a triply pivalate-bridged dinuclear Co‚‚‚Gd motif with a quinoline molecule ligated to the Co i ...
... As shown in Figure 3, complex 4 consists of a discrete trinuclear [Co2Gd(O2CCMe3)6(C9H7N)2(NO3)] molecule with a crystallographic C2 axis passing through the Gd and N(1) atoms. This molecule also contains a triply pivalate-bridged dinuclear Co‚‚‚Gd motif with a quinoline molecule ligated to the Co i ...
Chem. Mater. - ACS Publications
... above and below the layers. Another two cobalt complexes, centered by Co3 and Co4, are attached as pendants on both sides of the layers, also by hydrogen bonds. Each pillar hydrogen bonds to the layer with one of its sulfonate groups and to a pendant metal complex with the other sulfonate group. The ...
... above and below the layers. Another two cobalt complexes, centered by Co3 and Co4, are attached as pendants on both sides of the layers, also by hydrogen bonds. Each pillar hydrogen bonds to the layer with one of its sulfonate groups and to a pendant metal complex with the other sulfonate group. The ...
Chapter 12 - Winona State University
... 12-1: Metal-Chelate Complexes Adenosine triphosphate (ATP) is an important tetradentate ligand, which binds divalent metal ions (Mg2+, Mn2+, Co2+, and Ni2+) through four of their six coordination positions. The fifth and sixth positions are occupied by water molecules. ...
... 12-1: Metal-Chelate Complexes Adenosine triphosphate (ATP) is an important tetradentate ligand, which binds divalent metal ions (Mg2+, Mn2+, Co2+, and Ni2+) through four of their six coordination positions. The fifth and sixth positions are occupied by water molecules. ...
communications - University of Notre Dame
... distances are 3.228(3) for the former, and 3.022(3) for the latter. The same effect is observed in Cs6Ge8Zn and indicates relatively strong covalent bonding between the tetrahedra and the interconnecting atoms (see below). The average CdÿPb distances are virtually identical for Cd1 and Cd2 (3.11 ...
... distances are 3.228(3) for the former, and 3.022(3) for the latter. The same effect is observed in Cs6Ge8Zn and indicates relatively strong covalent bonding between the tetrahedra and the interconnecting atoms (see below). The average CdÿPb distances are virtually identical for Cd1 and Cd2 (3.11 ...
* Porphyrins. XXVII.
... This compound, previously unreported in the literature, was prepared by oxidizing the Pb(II)OEP with chlorine gas. Approximately 5 mg of Pb(II)OEP was dissolved in 10 ml of dry 3-methylpentane. A chlorine solution was made by bubbling chlorine gas through 10 ml of dry 3-methylpentane until a distinc ...
... This compound, previously unreported in the literature, was prepared by oxidizing the Pb(II)OEP with chlorine gas. Approximately 5 mg of Pb(II)OEP was dissolved in 10 ml of dry 3-methylpentane. A chlorine solution was made by bubbling chlorine gas through 10 ml of dry 3-methylpentane until a distinc ...
Corynebactin and Enterobactin: Related Siderophores of Opposite
... The major role of siderophores in microbial iron transport and bacterial pathogenicity is now well established.1 These low molecular weight chelators are expressed to overcome the insolubility of Fe3+ at pH 7 (∼10-18 M).2 The ferric complexes enter the bacterial cell via specific receptor proteins o ...
... The major role of siderophores in microbial iron transport and bacterial pathogenicity is now well established.1 These low molecular weight chelators are expressed to overcome the insolubility of Fe3+ at pH 7 (∼10-18 M).2 The ferric complexes enter the bacterial cell via specific receptor proteins o ...
Mono- and Trinuclear Nickel(II) Complexes with Sulfur-Containing Oxime Ligands:
... and the oximinopropyl arms are again folded away from the central S-C-C-S unit (Figure 4). This folding is a critical feature of these molecules, and we advance that it is one of the causes for formation both of the trimer and of the bis(iminoether) by destabilization of the square planar macrocycli ...
... and the oximinopropyl arms are again folded away from the central S-C-C-S unit (Figure 4). This folding is a critical feature of these molecules, and we advance that it is one of the causes for formation both of the trimer and of the bis(iminoether) by destabilization of the square planar macrocycli ...
Sulfur K-Edge XAS and DFT Calculations on P450 Model
... the covalency of the Fe-S bond in the oxidized state, which can be determined directly from S K-edge XAS. ...
... the covalency of the Fe-S bond in the oxidized state, which can be determined directly from S K-edge XAS. ...
this PDF file
... recognition for template molecule in comparison with NIP and MIP-no metal ion coordination. Proteins may undergo conformational changes in the presence of monomers and crosslinkers due to its vulnerable nature. It was reported that for lysozyme and bovine hemoglobin there was a significant change on ...
... recognition for template molecule in comparison with NIP and MIP-no metal ion coordination. Proteins may undergo conformational changes in the presence of monomers and crosslinkers due to its vulnerable nature. It was reported that for lysozyme and bovine hemoglobin there was a significant change on ...
M.Sc. (Previous) Chemistry
... encouraging to see that the important qualitative features are the same. The general purpose diagram pertains to a situation in which there is only a small energy difference between the ns and np orbitals of the central atom. As stated in discussing that general purpose diagram, it is not clear whet ...
... encouraging to see that the important qualitative features are the same. The general purpose diagram pertains to a situation in which there is only a small energy difference between the ns and np orbitals of the central atom. As stated in discussing that general purpose diagram, it is not clear whet ...
9 carbene complexes in olefin metathesis and ring
... of Mo, W, and Ti have been very effective in the ring-opening metathesis polymerization reactions described below. Another family is derived from metal carbonyls, especially Mo(CO)6 and W(CO)6 and ligand-substituted derivatives such as [W(CO)5Cl]-. The metal carbonyl catalysts usually require activa ...
... of Mo, W, and Ti have been very effective in the ring-opening metathesis polymerization reactions described below. Another family is derived from metal carbonyls, especially Mo(CO)6 and W(CO)6 and ligand-substituted derivatives such as [W(CO)5Cl]-. The metal carbonyl catalysts usually require activa ...
Amidinate Ligands in Zinc coordination sphere: Synthesis and
... organic chemistry.2,3 There has been significant interest in zinc chemistry in the last decade. Several systems including N, N’-chelating organic ligands such as βdiketiminate,4 guanidinate5 and amidinate anions6 have been investigated intensely in both main group and transition metal chemistry.7 It ...
... organic chemistry.2,3 There has been significant interest in zinc chemistry in the last decade. Several systems including N, N’-chelating organic ligands such as βdiketiminate,4 guanidinate5 and amidinate anions6 have been investigated intensely in both main group and transition metal chemistry.7 It ...
Fragmentation of doubly charged metal–acetamide complexes
... methyl cation, CH3 + , have also been observed [30–33]. [M(CH3 CN)n ]2+ → [M(CN)(CH3 CN)n−1 ]+ + CH3 + and [M(CH3 SOCH3 )n ]2+ → [M(SOCH3 )(CH3 SOCH3 )n−1 ]+ + CH3 + Metal–ligand complexes can be generated by electrospray ionization (ESI) and examined by mass spectrometry (MS). Since the early 1990s ...
... methyl cation, CH3 + , have also been observed [30–33]. [M(CH3 CN)n ]2+ → [M(CN)(CH3 CN)n−1 ]+ + CH3 + and [M(CH3 SOCH3 )n ]2+ → [M(SOCH3 )(CH3 SOCH3 )n−1 ]+ + CH3 + Metal–ligand complexes can be generated by electrospray ionization (ESI) and examined by mass spectrometry (MS). Since the early 1990s ...
HW#4-chem481-chapter
... chelating agent. It is hexadentate. • This ligand forms complexes with many metal ions, including Pb2+, and is used to treat lead poisoning. • Unfortunately, it also removes Ca2+ and Fe2+ along with the lead. • Chelating agents are common in nature. Chemistry 481, Spring 2017, LA Tech ...
... chelating agent. It is hexadentate. • This ligand forms complexes with many metal ions, including Pb2+, and is used to treat lead poisoning. • Unfortunately, it also removes Ca2+ and Fe2+ along with the lead. • Chelating agents are common in nature. Chemistry 481, Spring 2017, LA Tech ...
Dimethylsulphoxide Complexes of Vanadium(III) o
... bonded to the metal ion. The peak at around 285 cm- I is assigned for the M-Q-S angle deformation as reported for the [Cr(DMSO)]," species (Berney and Weber 1968) and the bands at 275·205 cm- l region to CH 3 torsion modes. Although bands below 100 cm- 1 , assigned to coordinated DMSO have been repo ...
... bonded to the metal ion. The peak at around 285 cm- I is assigned for the M-Q-S angle deformation as reported for the [Cr(DMSO)]," species (Berney and Weber 1968) and the bands at 275·205 cm- l region to CH 3 torsion modes. Although bands below 100 cm- 1 , assigned to coordinated DMSO have been repo ...
Metal Hydrides: Transition Metal Hydride Complexes
... contains tetrahedral [NiH4]4 complexes and hydrogen anions H corresponding to the limiting ionic formula La3 þ Mg2þ 2 [NiH4]4 3H. However, hydrogenation of the metallic compounds NdMgNi4 and MgRh leads to nonstoichiometric hydrides for which electric conductivity measurements have not yet be ...
... contains tetrahedral [NiH4]4 complexes and hydrogen anions H corresponding to the limiting ionic formula La3 þ Mg2þ 2 [NiH4]4 3H. However, hydrogenation of the metallic compounds NdMgNi4 and MgRh leads to nonstoichiometric hydrides for which electric conductivity measurements have not yet be ...
Introduction to Bioinorganic Chemistry
... (4) Easy change between high- and low-spin states in ligand fields of medium strength (spin cross-over; see inset on p. 7, upper part); (5) Flexibility with respect to the nature of the donating ligand function (see inset on p. 7, lower part, for ligand classification), the coordination number and c ...
... (4) Easy change between high- and low-spin states in ligand fields of medium strength (spin cross-over; see inset on p. 7, upper part); (5) Flexibility with respect to the nature of the donating ligand function (see inset on p. 7, lower part, for ligand classification), the coordination number and c ...
Metal clusters inside out
... number of metal atoms, no matter whether these atoms are bonded to each other. In the following, the term will be used in its original meaning, as introduced by Cotton (1964), i.e. referring to units where an excess of metal valence electrons is involved in metal–metal (M –M ) bonding. Particularly, ...
... number of metal atoms, no matter whether these atoms are bonded to each other. In the following, the term will be used in its original meaning, as introduced by Cotton (1964), i.e. referring to units where an excess of metal valence electrons is involved in metal–metal (M –M ) bonding. Particularly, ...
Nanostructured Transition Metal Chalcogenides as - KIT
... Solid state materials like CuTi2S4 have recently also attracted interest as cathode materials in rechargable lithium ion batteries.[38,39] The process involved is not the traditional intercalation pathway of Li+ ions into host structures. Instead a combination displacement / intercalation (CDI) mech ...
... Solid state materials like CuTi2S4 have recently also attracted interest as cathode materials in rechargable lithium ion batteries.[38,39] The process involved is not the traditional intercalation pathway of Li+ ions into host structures. Instead a combination displacement / intercalation (CDI) mech ...
Metal clusters inside out
... number of metal atoms, no matter whether these atoms are bonded to each other. In the following, the term will be used in its original meaning, as introduced by Cotton (1964), i.e. referring to units where an excess of metal valence electrons is involved in metal–metal (M –M ) bonding. Particularly, ...
... number of metal atoms, no matter whether these atoms are bonded to each other. In the following, the term will be used in its original meaning, as introduced by Cotton (1964), i.e. referring to units where an excess of metal valence electrons is involved in metal–metal (M –M ) bonding. Particularly, ...
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.