Reactions of iron(III) with unsymmetric polybenzimidazole ligands: Synthesis, characterization and X-ray structure of unexpected mononuclear and tetranuclear complexes

1995 ◽  
Vol 59 (2-3) ◽  
pp. 413
Author(s):  
Miroslav Rapta ◽  
Peter Kamaras ◽  
Gregory A. Brewer ◽  
Geoffrey B. Jameson
Keyword(s):  
X Ray ◽  
Tetranuclear Complexes

scholarly journals Synthesis and Structural Characterization of a Tetranuclear Zinc(II) Complex with P,P'-Diphenylmethylenediphosphinate (pcp) and 2,2'-Bipyridine (2,2'-bipy) Ligands

2007 ◽  
Vol 62 (12) ◽  
pp. 1476-1480 ◽  
Author(s):  
Andrea Ienco ◽  
Stefano Midollini ◽  
Annabella Orlandini ◽  
Ferdinando Costantino
Keyword(s):  
Hydrogen Bonding ◽  
Zinc Ions ◽  
Monodentate Ligand ◽  
X Ray ◽  
Hydrogen Bonding Interactions ◽  
Metal Atoms ◽  
Oxygen Donors ◽  
Tetranuclear Complexes ◽  
Water Hydrogen

A new tetranuclear complex of zinc(II) with P,P′-diphenylmethylenediphosphinate and 2,2′- bipyridine ligands was synthesized. [(pcp)(2,2′-bipy)Zn (μ3-pcp)Zn (2,2′-bipy)]2 · 6H2O was characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis and X-ray diffractometry. The structure consists of tetranuclear complexes connected through water hydrogen-bonding interactions in corrugated 2D layers. Two crystallographically independent zinc ions are in a distorted five-coordinate environment, being surrounded by three oxygen atoms of phosphinate groups (from two pcp ligands) and by two bipy nitrogen donors. Of the two independent pcp anions the first one utilizes all of its oxygen donors to coordinate one metal as bidentate and two metal atoms as a monodentate ligand, whereas the second one is only bidentate for one metal atom.

Synthesis of Rhodium, Iridium, and Palladium Tetranuclear Complexes Directed by 2,6-Dimercaptopyridine. X-ray Crystal Structure of [Rh4(μ-PyS2)2(cod)4] (cod = 1,5-Cyclooctadiene)

1996 ◽  
Vol 35 (7) ◽  
pp. 1782-1791 ◽  
Author(s):  
Jesús J. Pérez-Torrente ◽  
Miguel A. Casado ◽  
Miguel A. Ciriano ◽  
Fernando J. Lahoz ◽  
Luis A. Oro
Keyword(s):  
Crystal Structure ◽  
X Ray ◽  
Tetranuclear Complexes

Three 3d–4f Tetranuclear Complexes Based on 2,3,5-Trichlorobenzoic Acid: Syntheses, Structures, and Magnetic Properties

2016 ◽  
Vol 69 (4) ◽  
pp. 446 ◽  
Author(s):  
Yu Zhang ◽  
Ji-Min Zheng
Keyword(s):  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
Hydrogen Bonds ◽  
Metal Ions ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Triclinic Space Group ◽  
X Ray ◽  
Ferromagnetic Interactions ◽  
Tetranuclear Complexes

The solvothermal reactions of 2,3,5-trichlorobenzoic acid (HL) 2,2′-bipyridine (bipy), CoCl2·6H2O, and Ln2O3 afforded three novel 3d–4f tetranuclear complexes Co2Ln2(L)10(bipy)2 (Ln = Dy 1, Ho 2, and Er 3), which have been characterized by single-crystal X-ray diffraction, infrared spectroscopy, and element analyses. Complexes 1–3 crystallize in the triclinic space group P1, and the completely deprotonated L ligands possess μ2 : η2, η1 and μ2 : η1, η1 coordination modes to bridge adjacent metal ions, which further connect into 2D layers by hydrogen bonds. Magnetic studies indicate ferromagnetic interactions between adjacent metal ions in complexes 1 and 3.

Unprecedented tetranuclear complexes with “weighing balance shaped” topology: single crystal structures, unusual EPR spectra, magnetic properties and antioxidant activity

2017 ◽  
Vol 46 (35) ◽  
pp. 11860-11874 ◽  
Author(s):  
Yogendra Singh ◽  
Ram N. Patel ◽  
Yogendra Pratap Singh ◽  
Abhay K. Patel ◽  
Neetu Patel ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Magnetic Properties ◽  
Single Crystal ◽  
Crystal Structures ◽  
Epr Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Single Crystal Structures ◽  
Tetranuclear Complexes

Two new copper(ii) complexes have been synthesized and characterized by single crystal X-ray diffraction.

Direct Synthesis of Tetranuclear Complexes of Copper(II) with μ4-Bridging Oxygen

1993 ◽  
Vol 48 (10) ◽  
pp. 1321-1324 ◽  
Author(s):  
Vadim Pavlenko ◽  
Vladimir Kokozay ◽  
Olga Babich
Keyword(s):  
Direct Synthesis ◽  
Structure Investigation ◽  
X Ray ◽  
Metal Atoms ◽  
Tetranuclear Complexes

The direct synthesis of a number complexes with general composition Cu4OCl6 - n(CH3)2NH · mSolv, where n = 4, m = 0-2 and Solv = CH3OH, DMSO, is reported. It is shown by X-ray structure investigation, that in Cu4OCl6.4 (CH3)2NH the copper atoms are linked by μ4-oxygen and μ2-chlorine bridging atoms, while molecules of (CH3)2NH are attached to the metal atoms via nitrogen ones

3d4f Heterobimetallic Dinuclear and Tetranuclear Complexes Involving Tetrathiafulvalene as Ligands: X-ray Structures and Magnetic and Photophysical Investigations

2012 ◽  
Vol 51 (15) ◽  
pp. 8488-8501 ◽  
Author(s):  
Goulven Cosquer ◽  
Fabrice Pointillart ◽  
Boris Le Guennic ◽  
Yann Le Gal ◽  
Stéphane Golhen ◽  
...  
Keyword(s):  
X Ray ◽  
Tetranuclear Complexes

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

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