Stabilization of High Oxidation States in Transition Metals. 2.1WCl6Oxidizes [WF6]-, but Would PtCl6Oxidize [PtF6]-? An Electrochemical and Computational Study of 5d Transition Metal Halides:  [MF6]zversus [MCl6]z(M = Ta to Pt;z= 0, 1−, 2−)

1998 ◽  
Vol 37 (13) ◽  
pp. 3284-3292 ◽  
Author(s):  
Stuart A. Macgregor ◽  
Klaus H. Moock
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Computational Study ◽  
Oxidation States ◽  
Metal Halides ◽  
High Oxidation

scholarly journals The reactions of α-amino acids and α-amino acid esters with high valent transition metal halides: synthesis of coordination complexes, activation processes and stabilization of α-ammonium acylchloride cations

RSC Advances ◽  
2017 ◽  
Vol 7 (17) ◽  
pp. 10158-10174 ◽  
Author(s):  
Lorenzo Biancalana ◽  
Marco Bortoluzzi ◽  
Eleonora Ferretti ◽  
Mohammad Hayatifar ◽  
Fabio Marchetti ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Transition Metal ◽  
Transition Metals ◽  
Coordination Compounds ◽  
Coordination Complexes ◽  
Amino Acid Esters ◽  
Metal Halides ◽  
High Valent ◽  
Acid Esters

We describe the synthesis of rare coordination compounds of early transition metals with α-amino acids and α-amino acid esters, the unusual C–C dimerization ofl-proline, and the stabilization of reactive α-ammonium acylchloride cations.

scholarly journals Low-dimensional magnetism in calcium nitridonickelate(II) Ca2NiN2

2021 ◽  
Author(s):  
Simon David Kloß ◽  
Paul Attfield
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Transition Metals ◽  
Redox Reaction ◽  
Oxidation States ◽  
Late Transition Metals ◽  
High Oxidation ◽  
Late Transition ◽  
Low Dimensional

Calcium nitridonickelate(II) Ca2NiN2 has been prepared through a high-temperature and high-pressure azide-mediated redox reaction, demonstrating that this method can stabilise nitrides of late transition metals in relatively high oxidation states....

Di(imino)pyridine Complexes as Catalysts for Homogeneous Olefin Oligomerization Reactions

2020 ◽  
pp. 43-49
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Metal Halides ◽  
Substituted Anilines ◽  
Pyridine Ligand ◽  
Metal Centers ◽  
Pyridine Complexes ◽  
Condensation Reactions ◽  
Ligand Precursors ◽  
Olefin Oligomerization

The synthesis of bis(arylimino)pyridine complexes of seven different transition metals and their applications after activation with methylaluminoxane (MAO) in homogeneous olefin dimerization and oligomerization reactions is described. The synthesis of bis(arylimino)pyridine ligand precursors was achieved via condensation reactions of 2,6-diacetylpyridine with different substituted anilines. The bis(arylimino)pyridine compounds were reacted with 3d transition metal halides of the metals Ti, V, Cr, Mn, Fe, Ni and Co to give the corresponding mono-ligated complexes. Among a series of complexes with varying metal centers, but containing the same ligand, the bis(arylimino)pyridine iron(III) complex provided the best results for the dimerization of 1-hexene after activation with MAO. Beside linear products, methyl branched olefins were detected as well. For all product compositions, a marginal higher amount of hexene dimers was observed, e.g. the insertion of 1-hexene proceeds slightly faster than the insertion of 1-pentene.

Reactions of 1,2,5-Triphenylphosphole and its Oxide, Sulfide, and Selenide with some Transition Metal Halides

1972 ◽  
Vol 50 (7) ◽  
pp. 1008-1016 ◽  
Author(s):  
D. Budd ◽  
R. Chuchman ◽  
D. G. Holah ◽  
A. N. Hughes ◽  
B. C. Hui
Keyword(s):  
Transition Metal ◽  
Oxygen Atom ◽  
Organic Solvents ◽  
Phosphorus Atom ◽  
Triphenylphosphine Oxide ◽  
Oxidation States ◽  
Metal Halides ◽  
Oxide Systems ◽  
Pyrrole Derivatives ◽  
Direct Contrast

Reactions of 1,2,5-triphenylphosphole (TPP) and 1,2,5-triphenylphosphole oxide (TPPO), sulfide (TPPS), and selenide (TPPSe) with some transition metal halides have been studied in dry, oxygen-free organic solvents. The reactivity of these ligands is clearly a function of the oxidation states of the metal, with the order being M(II) < M(III) < M(IV) < M(V). For example the ligands do not react with the metal(II) halides (Mn, Fe, Ni), while rapid reactions occur with niobium(V) and tantalum(V). Iron(III) and copper(II) are both reduced by TPP. The complexes resulting from these studies are mostly simple adducts of the various metal halides, although other species such as phospholium salts [Formula: see text] and oxytrichloride adducts, MOX3•TPPO(M = Nb, Ta) are also described. In the phospholium salts, the phosphole ring is protonated at the phosphorus atom which is in direct contrast to pyrrole derivatives. The origin of the oxygen atom in the oxytrichloride complexes is discussed and compared with data on the analogous triphenylphosphine oxide systems, where cleavage of the P=O bond occurs.

Catalytic ozonation of aqueous phenol over metal-loaded HZSM-5

2011 ◽  
Vol 63 (8) ◽  
pp. 1651-1656
Author(s):  
Nor Aishah Saidina Amin ◽  
Javaid Akhtar ◽  
H. K. Rai
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Catalytic Ozonation ◽  
Experimental Results ◽  
Oxidation States ◽  
Phenol Removal

The performances of HZSM-5 and transition metal-loaded HZSM-5 (Mn, Cu, Fe, Ti) catalysts during catalytic ozonation of phenol have been investigated. It was observed the performance order for removal of phenol and COD was Mn/HZSM-5&gt;Fe/HZSM-5&gt;Cu/HZSM-5&gt;Ti/HZSM-5&gt;HZSM-5. The presence of metals on HZSM-5 enhanced the phenol removal capability of HZSM-5. Mn loading on HZSM-5 was optimized due to its high phenol removal capability amongst metal-loaded HZSM-5 catalysts. Experimental results suggested that low amount of Mn loading on HZSM-5 was sufficient for HZSM-5 to act as catalyst and adsorbent. A maximum of 95.8 wt% phenols and 70.2 wt% COD were removed over 2 wt% Mn/HZSM-5 in 120 min. It was supposed that transition metals mainly acted as ozone decomposers due to their multiple oxidation states that enhanced the ozonation of phenol.

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