Linear Chain Mixed-Valence Systems with Direct Metal- Metal Interactions

1980 ◽  
pp. 387-411 ◽  
Author(s):  
H. J. Keller
Keyword(s):  
Linear Chain ◽  
Mixed Valence ◽  
Metal Interactions ◽  
Metal Metal

Linear Chain Bis(α,β-dionedioximato)metal Compounds of the Nickel Triad: Solid State Design by Molecular Engineering

1977 ◽  
Vol 32 (5) ◽  
pp. 516-527 ◽  
Author(s):  
H. Endres ◽  
H. J. Keller ◽  
R. Lehmann ◽  
A. Poveda ◽  
H. H. Rupp ◽  
...  
Keyword(s):  
Solid State ◽  
Linear Chain ◽  
Mixed Valence ◽  
Structural Data ◽  
Molecular Engineering ◽  
Complex Molecules ◽  
Metal Compounds ◽  
Metal Interactions ◽  
Wide Range ◽  
Metal Metal

Chemical and structural data of numerous bis(α,β-dionedioximato)metal(II) compounds are summarized. All of them crystallize in columns but principally two different kinds of molecular arrangements occur in the solids. In one phase the molecular planes are inclined to the direction of the linear metal chains with an angle different from 90°. This allows only indirect interactions between the metal ions via the ligand. (“M—L—M” stacking.) The other modification consists of molecules with their planes perpendicular to the M—M-chains. This form allows direct metal-metal contacts (“M—M” modification). Depending on a few molecular parameters a “M—L—M” or a “M—M” stacking is obtained upon crystallization. Since for those compounds which could be isolated in both modifications the M—L—M form has the higher density it is concluded that only stronger M—M interactions stabilize the less dense M—M forms.A wide range of metal-metal separations with a lower limit of 3.15 Å in mixed valence systems are found in different “M—M” compounds. In any case the intrachain metal-metal distances are reduced considerably upon oxidation of the bivalent complex molecules. The influence of “electronic” and “sterical” parameters of the complex molecules on the intermolecular metal interactions and on the type of columns in the solid state is discussed.

Tuning of Metal–Metal Interactions in Mixed-Valence States of Cyclometalated Dinuclear Ruthenium and Osmium Complexes Bearing Tetrapyridylpyrazine or -benzene

2014 ◽  
Vol 33 (18) ◽  
pp. 4893-4904 ◽  
Author(s):  
Takumi Nagashima ◽  
Takuya Nakabayashi ◽  
Takashi Suzuki ◽  
Katsuhiko Kanaizuka ◽  
Hiroaki Ozawa ◽  
...  
Keyword(s):  
Mixed Valence ◽  
Metal Interactions ◽  
Valence States ◽  
Metal Metal ◽  
Dinuclear Ruthenium ◽  
Osmium Complexes

scholarly journals Robin Jon Hawes Clark. 16 February 1935—6 December 2018

2020 ◽  
Vol 68 ◽  
pp. 103-129
Author(s):  
Alwyn G. Davies ◽  
Paul F. McMillan
Keyword(s):  
Raman Spectroscopy ◽  
Inorganic Compounds ◽  
Resonance Raman Spectroscopy ◽  
Linear Chain ◽  
Mixed Valence ◽  
Far Infrared ◽  
Vanadium Complexes ◽  
Coordination Numbers ◽  
Metal Metal ◽  
High Coordination

Robin Clark was a distinguished physical/inorganic chemist who made major discoveries in the coordination chemistry of the early transition metals, especially of titanium and vanadium complexes with high coordination numbers (notably seven and eight) and of the structures and physical properties of mixed valence, linear chain and metal–metal bonded compounds. He applied far-infrared spectroscopy to study metal–ligand vibrations systematically and established the technique for structure elucidation of transition metal and main group compounds. He also developed Raman and resonance Raman spectroscopy applied to inorganic compounds and highly coloured solids including mineral samples. That work led to his seminal applications of microbeam Raman spectroscopy for the identification of pigments and other constituents of artworks and historical artefacts, thereby developing a basis for testing their provenance and the identification of forgeries.

Kristallisierte Koordinationsverbindungen von 1.2-Benzochinondioximen mit den Metall-Ionen Ni(II), Pd(II) und Cu(II): Festkörper mit Metall-Metall-Wechselwirkungen / Crystallized Coordination Compounds of 1,2-Benzoquinonedioximes with the Metal Ions Ni(II), Pd(II) and Pt(II): Solids with Metal-Metal Interactions

1975 ◽  
Vol 30 (7-8) ◽  
pp. 535-538 ◽  
Author(s):  
H. Endres ◽  
H. J. Keller ◽  
M. Megnamisi-Bélombé ◽  
D. Nöthe
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Coordination Compounds ◽  
Linear Chain ◽  
Metal Salts ◽  
Optical Behaviour ◽  
Metal Contacts ◽  
Metal Interactions ◽  
Metal Metal ◽  
Show Evidence

Metal complexes obtained by reacting various 1,2-benzoquinonedioximes with metal salts of Ni(II), Pd(II), Pt(II) and Cu(II) show evidence of considerable metal-metal interactions. In the diamagnetic Pd(II) and Pt(II) derivatives the intermolecular interactions are accomplished by direct metal-metal contacts, which are heavily influenced by different substituents on the 1,2-benzoquinonedioxime (BCDH) moiety as evidenced by their optical behaviour. The unpaired electrons of the paramagnetic copper(II) species interact via ligand atoms in dinuclear clusters or linear chain polymers. The former solids crystallize with stoichiometry [Cu(BCD)2], while the latter compounds have the composition CuCl · BCDH.

scholarly journals Heterobimetallic lanthanide‐coinage metal compounds featuring possible metal‐metal interactions in the exited state

2021 ◽  
Author(s):  
Peter Werner Roesky ◽  
Milena Dahlen ◽  
Niklas Reinfandt ◽  
Chengyu Jin ◽  
Michael T. Gamer ◽  
...  
Keyword(s):  
Metal Compounds ◽  
Coinage Metal ◽  
Metal Interactions ◽  
Metal Metal
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