نتایج جستجو برای: inner transition elements

تعداد نتایج: 602988  

Journal: :Chemical communications 2013
Tzu-Tso Chen Yu-Sen Chen Ya-Ho Chang Jung-Ching Wang Yi-Fang Tsai Gene-Hsiang Lee Tin-Shen Kuo Hua-Fen Hsu

A V(III) thiolate complex activated C-Cl bond in dichloromethane via S-based nucleophilic attack. The reaction products, a V(III)-Cl species (major one) and a V(IV) binding to a CH(2) containing ligand (minor one) were obtained. The work demonstrates sulfur donors in the early-transition metal thiolates having strong nucleophilic characteristics.

Journal: :Organic & biomolecular chemistry 2016
Abhishek R Tiwari Bhalchandra M Bhanage

This work reports the synthesis of quinazolines from 2-aminobenzylamines with N-substituted benzylamines in the presence of molecular iodine. The developed methodology works smoothly under transition-metal free, additive free and solvent free conditions. The use of O2 as a green oxidant makes it a greatly economical, green and sustainable protocol. Moreover, no aqueous work up is required there...

2018

During the past decade, considerable concern has been expressed by environmental scientists over the increasing levels of a range of toxic elements in the environment. Among the most potentially hazardous are the so-called ‘heavy metals’, a term applied to cover a range of transition elements, including copper, zinc and nickel and other elements such as cadmium, mercury and lead. Acutely toxic ...

Journal: :Acta crystallographica. Section A, Foundations of crystallography 2010
Philip Coppens Jason Benedict Marc Messerschmidt Irina Novozhilova Tim Graber Yu-Sheng Chen Ivan Vorontsov Stephan Scheins Shao-Liang Zheng

Definitive experimental results on the geometry of fleeting species are at the time of writing still limited to monochromatic data collection, but methods for modifications of the polychromatic Laue data to increase their accuracy and their suitability for pump-probe experiments have been implemented and are reviewed. In the monochromatic experiments summarized, excited-state conversion percent...

Journal: :Chemical communications 2003
Bubin Xu Zhonghua Peng Yongge Wei Douglas R Powell

A terpyridine ligand is covalently linked to a hexamolybdate cluster through the Mo-N imido bond, paving the way for the preparation of hybrids containing covalently bonded transition metal complexes and polyoxometalate clusters.

2005
Yanping Li D. Y. Li

Adhesion and friction between metallic materials are of importance to many dynamic mechanical systems, particularly to those at nanoor micro-scales. Under light loads, friction is mainly dependent on the adhesion between two surfaces in contact, to which valence electrons have the predominant contribution. However, the correlation between the electronic behavior and adhesion as well as friction...

Journal: :Chemical communications 2015
Martin Pawliczek Lennart K B Garve Daniel B Werz

Benzodithioloimines are reacted with arynes or alkynes substituted with electron-withdrawing groups to afford the corresponding thianthrene or benzo[b][1,4]dithiine derivatives. The transformation takes place under mild reaction conditions without any transition metal. Furthermore, the reaction mode could be expanded to 2-thiocyanatopyrroles yielding pyrrolothiazoles.

Journal: :Dalton transactions 2010
Richard Singleton James Bye James Dyson Gary Baker Robert M Ranson Gary B Hix

A series of phenylphosphonates, Zn(1-x)Mn(x)(O(3)PC(6)H(5)) x H(2)O, where x = 0, 0.005, 0.25, 0.5, 0.75 and 1.0, has been prepared and their photoluminescence responses studied. The presence of Mn in the sample results in a red emission, whilst when x = 0 the emission is green. Levels of Mn <1 mol% result in an orange emission. Ag(6)(m-O(3)PC(6)H(4)CO(2))(2) has been prepared by hydrothermal r...

2016
Wenbin Li Ju Li

Monolayers of transition metal dichalcogenides can exist in several structural polymorphs, including 2H, 1T and 1T'. The low-symmetry 1T' phase has three orientation variants, resulting from the three equivalent directions of Peierls distortion in the parental 1T phase. Using first-principles calculations, we predict that mechanical strain can switch the relative thermodynamic stability between...

Journal: :Beilstein Journal of Organic Chemistry 2005
Manfred T Reetz Hongchao Guo

The previously reported concept of using mixtures of monodentate ligands in a combinatorial manner in order to influence enantio- or regioselectivity of transition metal catalyzed processes has been extended to include diastereoselectivity. Accordingly, 1,2- and 1,3-asymmetric induction in the Rh-catalyzed hydrogenation of a chiral allylic alcohol and a chiral homo-allylic alcohol has been stud...

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