نتایج جستجو برای: inner transition elements

تعداد نتایج: 602988  

2016
Yishu Wang Yejun Feng J-G Cheng W Wu J L Luo T F Rosenbaum

Magnetic and superconducting ground states can compete, cooperate and coexist. MnP provides a compelling and potentially generalizable example of a material where superconductivity and magnetism may be intertwined. Using a synchrotron-based non-resonant X-ray magnetic diffraction technique, we reveal a spiral spin order in MnP and trace its pressure evolution towards superconducting order via m...

2016
Naoya Iwahara Liviu F. Chibotaru

It is well known that the kinetic exchange interaction between single-occupied magnetic orbitals (s-s) is always antiferromagnetic, while between single- and double-occupied orbitals (s-d) is always ferromagnetic and much weaker. Here we show that the exchange interaction between strongly anisotropic doublets of lanthanides, actinides and transition metal ions with unquenched orbital momentum c...

Journal: :Chemical communications 2012
Simone G Weber David Zahner Frank Rominger Bernd F Straub

A sterically shielded cationic NHC gold complex IPr**Au-BArF(24) without solvent coordination has been prepared in situ in CH(2)Cl(2). The monovalent transition metal electrophile, a "soft proton", heterolytically activates the C-B bond of the weakly coordinating counterion tetrakis[3,5-bis(trifluoromethyl)phenyl]borate at room temperature.

2008
Basu Panthi Stephen L. Gipson Andreas Franken

The structure of the title compound, [RhI(2)(C(3)F(7))(C(27)H(26)P(2))]·CH(2)Cl(2), at 110 (2) K is an unusual example of a structurally characterized square-based pyramidal alkyl complex of rhodium(III). The Rh-C bond is relatively short at 1.996 (6) Å. This short metal-carbon bond length is typical of perfluoro complexes of transition metals and illustrates the enhanced bond strength in these...

Journal: :The Journal of chemical physics 2004
Antonis N Andriotis Giannis Mpourmpakis George E Froudakis Madhu Menon

Electronic and magnetic properties of small binary clusters containing one or two transition metal atoms are investigated using ab initio calculations with a view to explain the experimentally observed magnetic enhancement/reduction in these systems. As the present investigations do not rely on spin-orbit effects, our results reveal the enhancement or reduction in the magnetic moment to depend ...

Journal: :Physical chemistry chemical physics : PCCP 2015
Younes Abghoui Anna L Garden Valtýr Freyr Hlynsson Snædís Björgvinsdóttir Hrefna Ólafsdóttir Egill Skúlason

Commercial design of a sustainable route for on-site production of ammonia represents a potential economic and environmental breakthrough. In an analogous process to the naturally occurring enzymatic mechanism, synthesis of ammonia could be achieved in an electrochemical cell, in which electricity would be used to reduce atmospheric nitrogen and water into ammonia at ambient conditions. To date...

Journal: :Molecules 2013
Xufen Yu Dianqing Sun

Macrocyclic scaffolds are commonly found in bioactive natural products and pharmaceutical molecules. So far, a large number of macrocyclic natural products have been isolated and synthesized. The construction of macrocycles is generally considered as a crucial and challenging step in the synthesis of macrocyclic natural products. Over the last several decades, numerous efforts have been underta...

Journal: :Chemical communications 2011
Holger Braunschweig Rian D Dewhurst Katharina Kraft Krzysztof Radacki

Intermetallic borylene transfer has been applied to synthesise new borido complexes. Starting from [{(η(5)-C(5)Me(5))Fe(CO)(2))}(μ-B){Cr(CO)(5)}] (1) the borylene moiety has been transferred successfully to different transition metal fragments. In the manner described, two new compounds have been fully characterised in solution and by X-ray crystallography.

Journal: :Physical review letters 2000
P S Bagus R Broer W A de Jong W C Nieuwpoort F Parmigiani L Sangaletti

Ab initio theoretical results for the 2p- and 3p-hole states of an Mn(2+) ion are reported in order to determine the importance of atomic contributions to the photoelectron spectra of bulk MnO. A combined treatment of relativity and electron correlation reveals important physical effects that have been neglected in virtually all previous work. The many-body and relativistic effects included in ...

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