From Bent to Linear Uranium Metallocenes:  Influence of Counterion, Solvent, and Metal Ion Oxidation State

2006 ◽  
Vol 25 (23) ◽  
pp. 5603-5611 ◽  
Author(s):  
Jérôme Maynadié, ◽  
Jean-Claude Berthet ◽  
Pierre Thuéry ◽  
Michel Ephritikhine
Keyword(s):  
Oxidation State ◽  
Metal Ion

scholarly journals Metal ion remediation by polyamidoamine dendrimers: a comparison of metal ion, oxidation state, and titania immobilization

2013 ◽  
Vol 11 (6) ◽  
pp. 1497-1502 ◽  
Author(s):  
V. A. Castillo ◽  
M. A. Barakat ◽  
M. H. Ramadan ◽  
H. L. Woodcock ◽  
J. N. Kuhn
Keyword(s):  
Oxidation State ◽  
Metal Ion ◽  
Polyamidoamine Dendrimers

Metal Ion Site Geometry and Oxidation State in Zeolites

1983 ◽  
pp. 319-332
Author(s):  
T. I. MORRISON ◽  
P. J. VICCARO ◽  
G. K. SHENOY
Keyword(s):  
Oxidation State ◽  
Metal Ion

Effects of Oxidation State on Metal Ion Binding byMedicago sativa(Alfalfa):  Atomic and X-ray Absorption Spectroscopic Studies with Fe(II) and Fe(III)

2000 ◽  
Vol 34 (4) ◽  
pp. 693-698 ◽  
Author(s):  
K. J. Tiemann ◽  
J. L. Gardea-Torresdey ◽  
G. Gamez ◽  
K. Dokken ◽  
Irene Cano-Aguilera ◽  
...  
Keyword(s):  
Oxidation State ◽  
Metal Ion ◽  
Spectroscopic Studies ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
X Ray ◽  
X Ray Absorption

New Bond-Valence Sum Model

1997 ◽  
Vol 53 (6) ◽  
pp. 885-894 ◽  
Author(s):  
J. P. Naskar ◽  
S. Hati ◽  
D. Datta
Keyword(s):  
Oxidation State ◽  
Coordination Sphere ◽  
Metal Ion ◽  
Nickel Complexes ◽  
Bond Valence ◽  
Oxidation States ◽  
Linear Variation ◽  
Axial Bond ◽  
Inorganic Complexes ◽  
Bond Valence Sum

A new expression is devised empirically to accommodate zero and some negative oxidation states in the bond-valence sum approach. The method is worked out in detail for a number of homoleptic copper and nickel complexes of various coordinating atoms in several oxidation states of the metals. An implication of the expression is a linear variation between 1/r eq and 1/r ax in octahedral MX 6 moieties, where r eq and r ax are, respectively, the average equatorial and axial bond lengths. This is verified in Cu2+ X 6 chromophores for X = F, O, N and S. The usefulness of the new expression in assessing the compatibility of a coordination sphere with an oxidation state of a metal ion is demonstrated by exemplary applications to some inorganic complexes, azurin and urease.

Variations on a Cage Theme: Some Complexes of Bicyclic Polyamines as Supramolecular Synthons

2009 ◽  
Vol 62 (10) ◽  
pp. 1246 ◽  
Author(s):  
Ian J. Clark ◽  
Alessandra Crispini ◽  
Paul S. Donnelly ◽  
Lutz M. Engelhardt ◽  
Jack M. Harrowfield ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Aromatic Ring ◽  
Oxidation State ◽  
Metal Ion ◽  
Intermolecular Forces ◽  
Optically Active ◽  
Alphabetical Order ◽  
Supramolecular Synthons ◽  
Π Stacking ◽  
Parallel Arrays

Dedication: One of Alan Sargeson’s great abilities was to seek out knowledge on topics of which he was not the master from those people with the expertise. This led occasionally to publications with a ‘cricket team’ of authors but with a rich brew of information, often international. Alan also insisted that all authors were equal since, without any one, the paper would not be what it was. Hence, he endeavoured to pursue the policy, difficult to maintain over a period where an obsession with absurdities such as the order of authors and point-scoring based on meaningless publication indices became so important in the maintenance of research, of listing authors simply in alphabetical order. In describing work begun while he was still with us, we have attempted to adhere to his principles. Analysis of a body of crystallographic information concerning metal(ii) and metal(iii) complexes of macrobicyclic hexamine ligands and some of their derivatives provides evidence for the action of a variety of intermolecular forces within the lattices. Hydrogen bonding is universal and its forms depend strongly upon the oxidation state and the particular nature of the metal ion bound to the macrobicycle. The introduction of both aliphatic and aromatic substituents leads to lattices in which these substituents associate, although, in the case of aromatic substituents, this is not necessarily a consequence of ‘π-stacking’, despite the fact that the aromatic ring planes form parallel arrays. At least in the case of CoIII, stable enantiomers of the complexes can be obtained, and in {Δ-(+)589-[Co{(NH3)(CH3)sar}]}2Cl2(C6(CO2)6)·26H2O (sar = 3,6,10,13,16,19-hexa-azabicyclo[6.6.6]icosane), the benzene hexacarboxylate anion adopts a chiral conformation in the presence of the optically active cation.

Mutual Ligand-Metal Ion Oxidation State Stabilizaton in a System Containing a Quadridentate Macrocycle Analogous to the Porphyrin Ring

1970 ◽  
Vol 92 (2) ◽  
pp. 400-402 ◽  
Author(s):  
Nurhan E. Tokel ◽  
Vladimir. Katovic ◽  
Keith. Farmery ◽  
Larry B. Anderson ◽  
Daryle H. Busch
Keyword(s):  
Oxidation State ◽  
Metal Ion ◽  
Porphyrin Ring

The decomposition of permanganate in molten alkali-metal nitrates

1974 ◽  
Vol 27 (5) ◽  
pp. 943 ◽  
Author(s):  
RB Temple ◽  
GW Thickett
Keyword(s):  
Heavy Metal ◽  
Thermal Decomposition ◽  
Alkali Metal ◽  
Metal Ions ◽  
Oxidation State ◽  
Rate Constant ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Metal Nitrates ◽  
Fixed Weight

The decomposition of MnO4- has been studied in molten (K/Li)NO3 eutectic at temperatures between 150� and 200�C. The rate of decomposition in a Pyrex vessel increased in the presence of traces of NO2-, Br- and CN- and of the manganate(1V) precipitate produced in the decomposition. Various transition and heavy metal ions were also found to accelerate the decomposition of MnO4- : the rate law appears to be -d[MnO4-]/dt = k[Mn+]2/n[MnO4-] where n = oxidation state of metal ion M which was added to the melt solution of MnO4- (in the presence of a fixed weight of insoluble reaction product). Nickel and cobalt(11) ions are oxidized by MnO4- to insoluble nickel(111) and cobalt(111) manganates(1V). Whilst NO2- produced by the thermal decomposition of NO3- appears to be the active reductant in (K/Li)NO3 melts, the reaction is complicated by being partly heterogeneous. The method of preparation of the reaction product critically affects the rate constant k.

Oxidation of cumene by dioxygen. The effect of radical initiators on the rate of the reaction catalyzed by 3d-transition metal 2,4-pentanedionates

1991 ◽  
Vol 56 (2) ◽  
pp. 344-350
Author(s):  
Stanislav Luňák ◽  
Růžena Chmelíková ◽  
Pavel Lederer
Keyword(s):  
Transition Metal ◽  
Oxidation State ◽  
Ethyl Ether ◽  
Oxidation Rate ◽  
Metal Ion ◽  
Cumene Hydroperoxide ◽  
Transition Metal Ion ◽  
Radical Initiators ◽  
Catalyzed Oxidation ◽  
Dibenzoyl Peroxide

The effect of cumene hydroperoxide, benzoin ethyl ether and dibenzoyl peroxide on the oxidation of cumene by dioxygen catalyzed by VO(II), Cr(III), Mn(II), Fe(III), Co(II), Co(III) and Cu(II) 2,4-pentanedionates was studied. The rate of the catalyzed oxidation of cumene by dioxgen can not only be increased but also decreased by the presence of radical initiators, whereas in the absence of the catalyst the oxidation rate is always increased by the radical initiators. Which effect takes actually place is determined by the kind and oxidation state of the transition metal ion catalyst as well as by the kind of the radical initiator.

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