Supramolecular Chemistry—Scope and Perspectives Molecules
... coordination. Supramolecular catalysis by receptors bearing reactive groups effects bond cleavage reactions as well as synthetic bond formation via cocatalysis. Lipophilic receptor molecules act as selective carriers for various substrates and make it possible to set up coupled transport processes l ...
... coordination. Supramolecular catalysis by receptors bearing reactive groups effects bond cleavage reactions as well as synthetic bond formation via cocatalysis. Lipophilic receptor molecules act as selective carriers for various substrates and make it possible to set up coupled transport processes l ...
PDF (Chapter 4)
... At the center of biological dioxygen transport are transition-metal complexes of iron or copper. To model such systems, chemists have prepared several synthetic oxygen carriers, especially of iron and cobalt porphyrins. In this chapter the structures and properties of biological and nonbiological ox ...
... At the center of biological dioxygen transport are transition-metal complexes of iron or copper. To model such systems, chemists have prepared several synthetic oxygen carriers, especially of iron and cobalt porphyrins. In this chapter the structures and properties of biological and nonbiological ox ...
Electron transfers in chemistry and biology R.A. Marcus a and
... must be fluctuations in other coordinates. As in any reaction the system as a whole proceeds from configurations (coordinates) in the vicinity of the equilibrium ones for the reactants to those for the products. In the present case, these coordinates involve vibrational coordinates of the reactants, ...
... must be fluctuations in other coordinates. As in any reaction the system as a whole proceeds from configurations (coordinates) in the vicinity of the equilibrium ones for the reactants to those for the products. In the present case, these coordinates involve vibrational coordinates of the reactants, ...
Metallocene Organoactinide Complexes
... that the 6d orbitals are chiefly involved in interactions with ligand-based orbitals. While the 5f orbital energy drops across the series, creating an energy match with ligand-based orbitals, spatial overlap is poor, precluding strong metal–ligand bonding [44]. Thorium lies early in the actinide seri ...
... that the 6d orbitals are chiefly involved in interactions with ligand-based orbitals. While the 5f orbital energy drops across the series, creating an energy match with ligand-based orbitals, spatial overlap is poor, precluding strong metal–ligand bonding [44]. Thorium lies early in the actinide seri ...
Tunneling Transistors Based on Graphene and 2
... atomic building blocks. The first column shows the ubiquitous 3-D crystal semiconductors. The second column shows the emerging family of 2-D crystals and their many variants. The third and fourth columns indicate ideal 1-D and 0-D structures. Atomic chains have been investigated for their transport ...
... atomic building blocks. The first column shows the ubiquitous 3-D crystal semiconductors. The second column shows the emerging family of 2-D crystals and their many variants. The third and fourth columns indicate ideal 1-D and 0-D structures. Atomic chains have been investigated for their transport ...
Analysis of structure–function relationships in cytochrome c oxidase
... One way to gain information on the parameters that tune oxygenreduction efficiency in enzymatic catalysis is the modification of the catalytic center in natural enzymes. Here introducing Cu to monometallic heme enzymes has been used to study its role as a promoter of oxygen reduction efficiency [16,22] ...
... One way to gain information on the parameters that tune oxygenreduction efficiency in enzymatic catalysis is the modification of the catalytic center in natural enzymes. Here introducing Cu to monometallic heme enzymes has been used to study its role as a promoter of oxygen reduction efficiency [16,22] ...
Perspectives on How Nature Employs the Principles of
... 1958 by Hieber and Gruber from the same laboratory (wherein Brendel’s thesis was mentioned in a footnote).13 The crystal structure was reported in 1965 by Dahl,14 a luminary in establishing the structure and bonding of Fe-S and other polymetallic clusters. Seyferth reduced this neutral complex conta ...
... 1958 by Hieber and Gruber from the same laboratory (wherein Brendel’s thesis was mentioned in a footnote).13 The crystal structure was reported in 1965 by Dahl,14 a luminary in establishing the structure and bonding of Fe-S and other polymetallic clusters. Seyferth reduced this neutral complex conta ...
Why does nature use zinc–a personal view†
... the metal zinc. In one of the early reviews on its biochemistry1 Vallee noted that it occurs in all six groups of the IUBMB enzyme classification. The number of enzymes known to contain zinc in the active center now exceeds 1000.2 In mid 2007 the Brookhaven protein data bank lists some 40 000 structu ...
... the metal zinc. In one of the early reviews on its biochemistry1 Vallee noted that it occurs in all six groups of the IUBMB enzyme classification. The number of enzymes known to contain zinc in the active center now exceeds 1000.2 In mid 2007 the Brookhaven protein data bank lists some 40 000 structu ...
mechanistic investigations of transition metal catalyzed reactions
... synthesis. The rich chemistry provided by the accessible d-orbitals make complexes of transition metals favorite aides in the never-ending quest for ways to build new molecules. As a testament to the importance of the field, several Nobel prizes have been awarded to transition metal catalyzed reacti ...
... synthesis. The rich chemistry provided by the accessible d-orbitals make complexes of transition metals favorite aides in the never-ending quest for ways to build new molecules. As a testament to the importance of the field, several Nobel prizes have been awarded to transition metal catalyzed reacti ...
Exploring the Chemistry of Metallic Solids , including
... their own way of doing so , depending on their nature and abilities . Observers will often agree with the overall picture , while they sometimes disagree about specific details . Scientific endeavor is much the same . Accumulated scientific knowledge is by general consensus accepted , while in many ...
... their own way of doing so , depending on their nature and abilities . Observers will often agree with the overall picture , while they sometimes disagree about specific details . Scientific endeavor is much the same . Accumulated scientific knowledge is by general consensus accepted , while in many ...
Pentadentate thioether-oxime macrocyclic and quasi-macrocyclic complexes of copper(II) and nickel(II)
... relative occupancies which gave the best fit to the diffraction data. The two positions for the methylene carbons have occupancies of 0.732 and 0.268, respectively. For [Cu(OdtoxH)]ClO4·[Cu(OdtoxH2)](ClO4)2 a total of 2555 reflections were collected (− 185h518, −15 5 k5 0, − 175 l5 15) in the range ...
... relative occupancies which gave the best fit to the diffraction data. The two positions for the methylene carbons have occupancies of 0.732 and 0.268, respectively. For [Cu(OdtoxH)]ClO4·[Cu(OdtoxH2)](ClO4)2 a total of 2555 reflections were collected (− 185h518, −15 5 k5 0, − 175 l5 15) in the range ...
STRUcruR.AL ASPEcrs AND COORDINATION CHEMISTRY OF
... l'he monocarbonyl cobalt complex Co(TPP)CO [7] has been identified spectroscopically at -150°C. The instability of this complex can be related to the (dxz , d vz ' d ...: v )6(dz l)1 configuration of cobalt since the single occupancy of the'dzl orbital weakens the cobalt-carbonyl sigma interaction. ...
... l'he monocarbonyl cobalt complex Co(TPP)CO [7] has been identified spectroscopically at -150°C. The instability of this complex can be related to the (dxz , d vz ' d ...: v )6(dz l)1 configuration of cobalt since the single occupancy of the'dzl orbital weakens the cobalt-carbonyl sigma interaction. ...
Inorganic Chemistry of LanthanideIV:
... being used in infrared filters and as a replacement for radioactive thorium dioxide in incandescent mantles. While cerium dioxide is transparent for visible light, it is a strong ultraviolet light absorber. Thus it has been envisaged as a prospective replacement for ZnO and TiO 2 in sunscreens, alth ...
... being used in infrared filters and as a replacement for radioactive thorium dioxide in incandescent mantles. While cerium dioxide is transparent for visible light, it is a strong ultraviolet light absorber. Thus it has been envisaged as a prospective replacement for ZnO and TiO 2 in sunscreens, alth ...
One-Electron Transformations of Paramagnetic Cobalt
... monomeric and square planar. There is some distortion from planarity in benzyl 5 as the two trans angles, P(1)-Co-P(2) and N-Co-C(31), are 162.93(3)° and 173.6(1)° (180° is ideal). Other structurally characterized compounds39 with Co(II)-C bonds include the cobalt(II) aryl complexes Co(PEt2Ph)2(mesi ...
... monomeric and square planar. There is some distortion from planarity in benzyl 5 as the two trans angles, P(1)-Co-P(2) and N-Co-C(31), are 162.93(3)° and 173.6(1)° (180° is ideal). Other structurally characterized compounds39 with Co(II)-C bonds include the cobalt(II) aryl complexes Co(PEt2Ph)2(mesi ...
Dinuclear Nickel(II) and Palladium(II) Complexes in Combination
... During our work, we became aware that only singular examples of homodinuclear Ni II -, PdII -, CoII and CrIII -complexes [15, 18, 22, 24, 69] were investigated. Thus, we present here the first polymerization results of a series of homodinuclear nickel(II) and palladium(II) complexes 1 to 10 with Sch ...
... During our work, we became aware that only singular examples of homodinuclear Ni II -, PdII -, CoII and CrIII -complexes [15, 18, 22, 24, 69] were investigated. Thus, we present here the first polymerization results of a series of homodinuclear nickel(II) and palladium(II) complexes 1 to 10 with Sch ...
The physics of manganites: Structure and transport
... aim of this review. The limitation of semiconductors in general is that room temperature is a large energy scale. If the gap is large enough to be in the intrinsic conduction limit at room temperature, the magnetic fields required to see changes are unattainable. If the gap is small and magnetic fie ...
... aim of this review. The limitation of semiconductors in general is that room temperature is a large energy scale. If the gap is large enough to be in the intrinsic conduction limit at room temperature, the magnetic fields required to see changes are unattainable. If the gap is small and magnetic fie ...
Coordination Chemistry Reviews Dibenzometallacyclopentadienes
... place of biphenylene, the reaction with [Pt(2 -C2 H4 )(PPh3 )2 ] giving [Pt(2,2 -bph)(PPh3 )2 ] occurs in seconds [7]. On standing, the product scavenges CO from Mn with loss of phosphine to form [Pt(2,2 -bph)(PPh3 )(CO)], a transformation which has been speculatively linked to the relief of ster ...
... place of biphenylene, the reaction with [Pt(2 -C2 H4 )(PPh3 )2 ] giving [Pt(2,2 -bph)(PPh3 )2 ] occurs in seconds [7]. On standing, the product scavenges CO from Mn with loss of phosphine to form [Pt(2,2 -bph)(PPh3 )(CO)], a transformation which has been speculatively linked to the relief of ster ...
Nanostructural Architectures from Molecular Building Blocks
... Molecular Building Blocks Covalent bonding has many advantages: – Covalent bonds lead to extremely stable intermolecular connections, as compared to electrostatic interactions (temperature, ionic strength, pH) – Covalnet bonds are dependable, they do not reorganise, like hydrogen bonds – Protocols ...
... Molecular Building Blocks Covalent bonding has many advantages: – Covalent bonds lead to extremely stable intermolecular connections, as compared to electrostatic interactions (temperature, ionic strength, pH) – Covalnet bonds are dependable, they do not reorganise, like hydrogen bonds – Protocols ...
Jahn–Teller effect
The Jahn–Teller effect, sometimes also known as Jahn–Teller distortion, describes the geometrical distortion of molecules and ions that is associated with certain electron configurations. This electronic effect is named after Hermann Arthur Jahn and Edward Teller, who proved, using group theory, that orbital nonlinear spatially degenerate molecules cannot be stable. The Jahn–Teller theorem essentially states that any nonlinear molecule with a spatially degenerate electronic ground state will undergo a geometrical distortion that removes that degeneracy, because the distortion lowers the overall energy of the species. For a description of another type of geometrical distortion that occurs in crystals with substitutional impurities see article off-center ions.