metal ion complexing properties of the highly preorganized ligands
... [Pb(PDALD)(OH)2] complex ................................................................................50 ...
... [Pb(PDALD)(OH)2] complex ................................................................................50 ...
Structural Diversity in Metal Phosphonate Frameworks: Impact on
... number of structural changes related to the P–O bond lengths. We will demonstrate this by using a number of examples, starting with 1D [Cu(HO3PCH(OH)CO2)(H2O)2] H2O, Figure 14.7.95 This material possesses a monodeprotonated phosphonic acid group that is coordinated to a metal ion in a monodentate ...
... number of structural changes related to the P–O bond lengths. We will demonstrate this by using a number of examples, starting with 1D [Cu(HO3PCH(OH)CO2)(H2O)2] H2O, Figure 14.7.95 This material possesses a monodeprotonated phosphonic acid group that is coordinated to a metal ion in a monodentate ...
Chapter 4 Metal nanoparticles stabilized by chiral ligands with carbohydrate backbone
... molecular species. Diphosphite chiral ligands were also used as stabilisers of palladium nanoparticles.[79] These palladium nanoparticles were active in the ...
... molecular species. Diphosphite chiral ligands were also used as stabilisers of palladium nanoparticles.[79] These palladium nanoparticles were active in the ...
A stability concept for metal ion coordination to single
... Abstract: The three-dimensional architecture and function of nucleic acids strongly depend on the presence of metal ions, among other factors. Given the negative charge of the phosphate-sugar backbone, positively charged species, mostly metal ions, are necessary for compensation. However, these ions ...
... Abstract: The three-dimensional architecture and function of nucleic acids strongly depend on the presence of metal ions, among other factors. Given the negative charge of the phosphate-sugar backbone, positively charged species, mostly metal ions, are necessary for compensation. However, these ions ...
Transition Metal Polyhydrides: From Qualitative
... presence of low-energy excited states. This requires the use of very high level computational methods that can be applied only on small-size systems. Although this review is focused on polyhydride systems, mention needs to be made of some diatomic M-H systems. These are among the first transition me ...
... presence of low-energy excited states. This requires the use of very high level computational methods that can be applied only on small-size systems. Although this review is focused on polyhydride systems, mention needs to be made of some diatomic M-H systems. These are among the first transition me ...
Synthesis and Structural Studies of Calcium and Magnesium
... growth including hydrothermal methods and gel crystallization were employed. We have used phosphinate and phosphonate ligands with different number of phosphorus oxygen atoms as well as diphosphonates with different linker lengths to determine their effects on the overall structural features. An int ...
... growth including hydrothermal methods and gel crystallization were employed. We have used phosphinate and phosphonate ligands with different number of phosphorus oxygen atoms as well as diphosphonates with different linker lengths to determine their effects on the overall structural features. An int ...
Full-Text PDF
... and amines, and thus becoming a rare example of metallasilsesquioxanes performing homogeneous catalysis. Benzene, cyclohexane, and other alkanes, as well as alcohols, can be oxidized in acetonitrile solution to phenol—the corresponding alkyl hydroperoxides and ketones, respectively—by hydrogen perox ...
... and amines, and thus becoming a rare example of metallasilsesquioxanes performing homogeneous catalysis. Benzene, cyclohexane, and other alkanes, as well as alcohols, can be oxidized in acetonitrile solution to phenol—the corresponding alkyl hydroperoxides and ketones, respectively—by hydrogen perox ...
A Pnictogen of Peculiar Posture
... family of T-shaped pnictogens, ranging from single molecules to one-dimensional ladders;7-9 theoretically, there has been an enumeration of T-shaped main group centers in 1-, 2-, and 3-dimensional networks.10 T-shaped P compounds, however, appear to be quite rare: a Cambridge Structural Database11 ( ...
... family of T-shaped pnictogens, ranging from single molecules to one-dimensional ladders;7-9 theoretically, there has been an enumeration of T-shaped main group centers in 1-, 2-, and 3-dimensional networks.10 T-shaped P compounds, however, appear to be quite rare: a Cambridge Structural Database11 ( ...
Marshall Gibson Dalton Manuscript B706663E revised
... chains to the readily accessible active sites. Nevertheless, the polymerisation of rac-LA using 3 is still significantly faster than with the -diketiminate initiators [HC{RC(NAr)}2]Sn(OiPr) and which typically require ca. 4 (R = Me) and 8 (R = tBu) hours at 60 °C to consume 100 equivalents of monom ...
... chains to the readily accessible active sites. Nevertheless, the polymerisation of rac-LA using 3 is still significantly faster than with the -diketiminate initiators [HC{RC(NAr)}2]Sn(OiPr) and which typically require ca. 4 (R = Me) and 8 (R = tBu) hours at 60 °C to consume 100 equivalents of monom ...
Lead(II) removal from aqueous solutions by solvent extraction with
... organic phases vs. extractant concentration. The slope of obtained straight line was determined to be 1.66 0.04 what can indicate that two metal ions are extracted by one ligand molecule, and complexes R(COO)4Pb2 are formed. ...
... organic phases vs. extractant concentration. The slope of obtained straight line was determined to be 1.66 0.04 what can indicate that two metal ions are extracted by one ligand molecule, and complexes R(COO)4Pb2 are formed. ...
Hydrogen bonding in thiobenzamide synthon and its Cadmium
... shown to be due to their capacity to form chelates with metal ions.7 In addition, thioamides coordinate with metal ions in many different bridging modes to generate supramolecular networks with versatile molecular topologies endorsed by extensive functionalities.8 13 These ligands are also of immens ...
... shown to be due to their capacity to form chelates with metal ions.7 In addition, thioamides coordinate with metal ions in many different bridging modes to generate supramolecular networks with versatile molecular topologies endorsed by extensive functionalities.8 13 These ligands are also of immens ...
- Free Documents
... application in various areas of materials science such as the control and measurement of radiation intensity, display systems and optical memory devices . Schiff bases derived from ohydroxyaromatic aldehydes and ketones are excellent models for the study of ketoenol tautomerism both in solution and ...
... application in various areas of materials science such as the control and measurement of radiation intensity, display systems and optical memory devices . Schiff bases derived from ohydroxyaromatic aldehydes and ketones are excellent models for the study of ketoenol tautomerism both in solution and ...
Substituent Effect in the γ–Position of Acetylacetonate on the
... Solvatochromic properties of a series of bis (3–substituted derivatives of acetylacetone) copper (II), [Cu(X-acac)2], (X = Cl, H. CH3) complexes were studied. All the complexes demonstrated negative solvatochromism. Among the complexes the Cu(Cl-acac)2, demonstrated the most solvatochromism ( = 4030 ...
... Solvatochromic properties of a series of bis (3–substituted derivatives of acetylacetone) copper (II), [Cu(X-acac)2], (X = Cl, H. CH3) complexes were studied. All the complexes demonstrated negative solvatochromism. Among the complexes the Cu(Cl-acac)2, demonstrated the most solvatochromism ( = 4030 ...
Characterization of metal ion-nucleic acid interactions in solution
... proteins. Typically most of the coordination sites in an RNA will have very similar metal affinities and are therefore filled more or less simultaneously [7,9,10]. In addition, metal ions bound to nucleic acids usually keep at least a part of their hydration shell, which is rather an exception in pr ...
... proteins. Typically most of the coordination sites in an RNA will have very similar metal affinities and are therefore filled more or less simultaneously [7,9,10]. In addition, metal ions bound to nucleic acids usually keep at least a part of their hydration shell, which is rather an exception in pr ...
Coordination Chemistry and Reactivity of Monomeric Alkoxides and
... homopolymerization of propylene oxide (PO) or cyclohexene oxide (CHO), although the magnesium amide 1 effects ring-opening by allylic proton abstraction and the dimeric compound [LMg(µ-OC6H9)]2, 7, is formed. Reactions with carbon dioxide are also described, along with the characterization of LZnO2C ...
... homopolymerization of propylene oxide (PO) or cyclohexene oxide (CHO), although the magnesium amide 1 effects ring-opening by allylic proton abstraction and the dimeric compound [LMg(µ-OC6H9)]2, 7, is formed. Reactions with carbon dioxide are also described, along with the characterization of LZnO2C ...
Metallocene Organoactinide Complexes
... In this particular review we will provide an overview of the preparation and properties of the major classes of actinide complexes containing different cyclopentadienyl ligands. Discussions are classified on the basis of formal oxidation states and we are confining our discussions only to the oxidatio ...
... In this particular review we will provide an overview of the preparation and properties of the major classes of actinide complexes containing different cyclopentadienyl ligands. Discussions are classified on the basis of formal oxidation states and we are confining our discussions only to the oxidatio ...
The polydentate ligands include polyaminopolycarbonic acids, such
... oxygen transport to the tissues of the body. Permanent exchange of substances to the environment enables to the body maintain a certain level of concentration of the compounds involved in the equilibrium of the complexation processes, providing metal-ligand homeostasis. In addition, complex compound ...
... oxygen transport to the tissues of the body. Permanent exchange of substances to the environment enables to the body maintain a certain level of concentration of the compounds involved in the equilibrium of the complexation processes, providing metal-ligand homeostasis. In addition, complex compound ...
New Insights into the Coordination Chemistry and Molecular
... species is proposed. Structural proposals from literature have been unambiguously confirmed, refined, or, in several cases, corrected. At highly acidic conditions, Cu2+ and his are present as free ions, but around pH ) 2, coordination starts via the deprotonated carboxylic acid group. This results i ...
... species is proposed. Structural proposals from literature have been unambiguously confirmed, refined, or, in several cases, corrected. At highly acidic conditions, Cu2+ and his are present as free ions, but around pH ) 2, coordination starts via the deprotonated carboxylic acid group. This results i ...
2 Oxidation and Oxygen Activation by Heme Proteins
... is interesting that the potentials required to oxidize a variety of metalloporphyrins to the p-cation radical stage are usually high enough to oxidize the corresponding magnesium porphyrin to the p-dication. Thus, if nature wishes to generate a metalloporphyrin p-dication, the metal that most favors ...
... is interesting that the potentials required to oxidize a variety of metalloporphyrins to the p-cation radical stage are usually high enough to oxidize the corresponding magnesium porphyrin to the p-dication. Thus, if nature wishes to generate a metalloporphyrin p-dication, the metal that most favors ...
4-methoxy phenol
... reagent especially in the spectra determination because of high sensitivity and selectivity. Many thiazolyl azo compounds have been synthesized and proposed as highly sensitive chromogenic reagents for the determination of several metal ions and give colored chelating complexes especially with some ...
... reagent especially in the spectra determination because of high sensitivity and selectivity. Many thiazolyl azo compounds have been synthesized and proposed as highly sensitive chromogenic reagents for the determination of several metal ions and give colored chelating complexes especially with some ...
CHAPTER 5 Electronic Properties of −Dawson Anions Wells
... MOs is the same, which suggests that the energy difference between both site reductions should be very close to the value obtained for the D3h form. All these results fully agree with the experimental data of Pope6b and Contant22 who demonstrated that equatorial sites are more easily reduced than po ...
... MOs is the same, which suggests that the energy difference between both site reductions should be very close to the value obtained for the D3h form. All these results fully agree with the experimental data of Pope6b and Contant22 who demonstrated that equatorial sites are more easily reduced than po ...
coordination compounds
... oxygen transport to the tissues of the body. Permanent exchange of substances to the environment enables to the body maintain a certain level of concentration of the compounds involved in the equilibrium of the complexation processes, providing metal-ligand homeostasis. In addition, complex compound ...
... oxygen transport to the tissues of the body. Permanent exchange of substances to the environment enables to the body maintain a certain level of concentration of the compounds involved in the equilibrium of the complexation processes, providing metal-ligand homeostasis. In addition, complex compound ...
The Organogallium Subhalide R Ga I as Starting Compound for the
... the mother liquor. It showed a resonance at δ = 0.32 in the 1 H NMR spectrum, however, all attempts to grow single crystals suitable for a crystal structure determination failed up to now, and its constitution is unknown yet. We did not succeed in isolating one of the remaining components of the rea ...
... the mother liquor. It showed a resonance at δ = 0.32 in the 1 H NMR spectrum, however, all attempts to grow single crystals suitable for a crystal structure determination failed up to now, and its constitution is unknown yet. We did not succeed in isolating one of the remaining components of the rea ...
Ligand
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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.