Assoziationsreaktionen von Tetrakis(arylisonitril)kobalt(II), -Rhodium(I) und Rhodium(III)-Komplexen in Lösung.

1976 ◽  
Vol 31 (7) ◽  
pp. 912-921 ◽  
Author(s):  
D. Baumann ◽  
H. J. Keller ◽  
D. Nöthe ◽  
H. H. Rupp ◽  
Gerd Uhlmann
Keyword(s):  
Solid State ◽  
Metal Complexes ◽  
Organic Solvents ◽  
Mixed Valence ◽  
Counter Anion ◽  
Experimental Parameters ◽  
Nmr Techniques ◽  
Paramagnetic Complexes

Investigations on several tetrakis(arylisonitrile)-metal complexes of general stoichiometry M(CNR)4n+Xn- with M = Rh(I), Rh(III), [n =1], [n = 3] or Co(II), [n = 2], R = p-tolyl, p-N,N-dimethylaminophenyl, p-nitrophenyl, e. g. and X- = iodide, ClO4-, [B(C6H5)4]- e. g. are described. The paramagnetic complexes of stoichiometry Co(CNR)4I2 dimerize in organic solvents to yield dinuclear diamagnetic cations with linear iodide bridges. The amount of association depends on the iodide content and on experimental parameters like temperature and/or concentration and can be followed by IR, ESR and/or NMR techniques. Treating of these compounds with ions X- = ClO4- or [B(C6H5)4]- gives the dinuclear and diamagnetic complexes of stoichiometry [I-Co(CNR)4-I-Co(CNR)4I]X. The corresponding isonitrile compounds of rhodium(I) associate in solution to yield linear stacks in the crystals. The solid state properties depend strongly on the type of ligand and the counter anion and vary considerably with the conditions of crystallization. The rhodium(I) species are able to react with the corresponding tetrakis(arylisonitrile)-rhodium(III) complexes to mixed valence solids.

Imidazole Promoted Efficient Anomerization of β-D-Glucose Pentaacetate in Organic Solutions and Solid State

2019 ◽  
Author(s):  
Meifeng Wang ◽  
Liyin Zhang ◽  
Yiqun Li ◽  
Liuqun Gu
Keyword(s):  
Solid State ◽  
Organic Solvents ◽  
Room Temperature ◽  
Materials Design ◽  
The Future ◽  
Organic Solutions ◽  
Glucose Pentaacetate

<p></p>Anomerization of glycosides were rarely performed under basic condition due to lack of efficiency. Here an imidazole promoted anomerization of β-D-glucose pentaacetate was developed; and reaction could proceed in both organic solvents and solid state at room temperature. Although mechanism is not yet clear, this unprecedent mild anomerization in solid state may open a new promising way for stereoseletive anomerization of broad glucosides and materials design in the future..

scholarly journals Functionalised Terpyridines and Their Metal Complexes—Solid-State Interactions

Chemistry ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 199-227
Author(s):  
Young Hoon Lee ◽  
Jee Young Kim ◽  
Sotaro Kusumoto ◽  
Hitomi Ohmagari ◽  
Miki Hasegawa ◽  
...  
Keyword(s):  
Solid State ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Weak Interactions ◽  
Dispersion Interactions ◽  
Derivatives Of

Analysis of the weak interactions within the crystal structures of 33 complexes of various 4′-aromatic derivatives of 2,2′:6′,2″-terpyridine (tpy) shows that interactions that exceed dispersion are dominated, as expected, by cation⋯anion contacts but are associated with both ligand–ligand and ligand–solvent contacts, sometimes multicentred, in generally complicated arrays, probably largely determined by dispersion interactions between stacked aromatic units. With V(V) as the coordinating cation, there is evidence that the polarisation of the ligand results in an interaction exceeding dispersion at a carbon bound to nitrogen with oxygen or fluorine, an interaction unseen in the structures of M(II) (M = Fe, Co, Ni, Cu, Zn, Ru and Cd) complexes, except when 1,2,3-trimethoxyphenyl substituents are present in the 4′-tpy.

ChemInform Abstract: Solid-State NMR Techniques in Oriented Systems

ChemInform ◽  
2010 ◽  
Vol 23 (43) ◽  
pp. no-no
Author(s):  
K. V. RAMANATHAN ◽  
B. S. ARUNKUMAR ◽  
N. SURYAPRAKASH ◽  
R. PRATIMA ◽  
C. L. KHETRAPAL
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Techniques

Solid-state 95Mo NMR of mixed-valence polyoxomolybdates (V, VI) with localized or delocalized d1 electrons

2010 ◽  
Vol 487 (4-6) ◽  
pp. 232-236 ◽  
Author(s):  
Takahiro Iijima ◽  
Toshihiro Yamase ◽  
Masataka Tansho ◽  
Tadashi Shimizu ◽  
Katsuyuki Nishimura
Keyword(s):  
Solid State ◽  
Mixed Valence

scholarly journals Determination of the Ratios of Ligands to Metal Ion of some Metal Complexes of Triazoles by Using Eleetronie Speetra in Organie Solvents

2004 ◽  
Vol 1 (1) ◽  
pp. 110-115
Author(s):  
Baghdad Science Journal
Keyword(s):  
Solid State ◽  
Metal Complexes ◽  
Electronic Spectra ◽  
Metal Ion ◽  
The Other ◽  
Molar Ratio ◽  
Other Hand

We found that 4,5- diphenyl- 3(2- propynyl) thio- 1??-triazole [1? forms a complex with Pd (11) ion of ratio 1:1 which absorbs light in CH2CI2 at 400 nm, and 4,5- diphenyl- 3(2- propenyl) thio- 1,2,4- triazole [II] forms complexes with Pd (II) ion of ratio 1:1 which absorbs light at 390 nm, and of ratio 2:1 which absorbs light at 435 nm. On the other hand, we found that the new derivative 4- phenyl- 5( p- amino phenyl) -3- mercapto- 1,2,4- triazole ?111? forms complexes with Cu (II) ion of the ratio 1:1 which absorbs light at 380 nm, with Ni (II) ion of the ratio 3:1 which absorbs light at 358 nm; and with Co (11) ion of the ratio 3.2:1 which absorbs light at 588 nm. The ratio of the complexes were determined by measuring the electronic spectra of the complexes in CH2G2 and (CH^NCHO at different concentrations ofthe ligands and f?xed ' •' of the metal ion in every case, then applying the molar ratio plots on the data. Our results were confirmed by precipitating most ofthe above complexes in solid state, and then each complex was analyzed elementally.

Suitability of Different 13C Solid-state NMR Techniques in the Characterization of Humic Acids

2002 ◽  
Vol 82 (4) ◽  
pp. 183-196 ◽  
Author(s):  
Jingdong Mao ◽  
Weiguo Hu ◽  
Guangwei Ding ◽  
Klaus Schmidt-Rohr ◽  
Geoffrey Davies ◽  
...  
Keyword(s):  
Solid State ◽  
Humic Acids ◽  
Solid State Nmr ◽  
Nmr Techniques
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