Tuning the Spin State of Cobalt in a Co-La Heterometallic Complex through Controllable Coordination Sphere of La

2011 ◽  
Vol 50 (24) ◽  
pp. 5504-5508 ◽  
Author(s):  
Song-Song Bao ◽  
Yi Liao ◽  
Yan-Hui Su ◽  
Xu Liang ◽  
Feng-Chun Hu ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Spin State ◽  
Heterometallic Complex

Tuning the Spin State of Cobalt in a Co-La Heterometallic Complex through Controllable Coordination Sphere of La

2011 ◽  
Vol 123 (24) ◽  
pp. 5618-5622 ◽  
Author(s):  
Song-Song Bao ◽  
Yi Liao ◽  
Yan-Hui Su ◽  
Xu Liang ◽  
Feng-Chun Hu ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Spin State ◽  
Heterometallic Complex

scholarly journals Spin transition in a ferrous chloride complex supported by a pentapyridine ligand

2020 ◽  
Vol 56 (18) ◽  
pp. 2703-2706
Author(s):  
Manuel Boniolo ◽  
Sergii I. Shylin ◽  
Petko Chernev ◽  
Mun Hon Cheah ◽  
Philipp A. Heizmann ◽  
...  
Keyword(s):  
High Spin ◽  
Coordination Sphere ◽  
Spin State ◽  
Spin Transition ◽  
Chloride Complex ◽  
Ferrous Chloride ◽  
High Spin Complex ◽  
Spin Complex

Apparent high-spin complex with FeN5Cl coordination sphere exhibits a complete transition to the low-spin state on cooling.

scholarly journals FIRST COORDINATION SPHERE AND SPIN-STATE IN SPIN CROSS-OVER IRON AND COBALT COMPLEXES

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-563-C8-568 ◽  
Author(s):  
C. CARTIER ◽  
P. THUERY ◽  
M. VERDAGUER ◽  
J. ZAREMBOWITCH ◽  
A. MICHALOWICZ
Keyword(s):  
Coordination Sphere ◽  
Spin State ◽  
Cobalt Complexes

Coordination state of cobalt(II) ions in solution and on a sulphonated organic polymer

1979 ◽  
Vol 44 (8) ◽  
pp. 2330-2337 ◽  
Author(s):  
Jindřiška Maternová ◽  
Anastas A. Andreev ◽  
Dimitrii M. Shopov ◽  
Karel Setínek
Keyword(s):  
Acetic Acid ◽  
Coordination Sphere ◽  
Glacial Acetic Acid ◽  
Organic Polymer ◽  
Octahedral Complex ◽  
Coordination State ◽  
Tetrahedral Symmetry ◽  
Liquid Acid ◽  
Homogeneous Phase ◽  
Bromide Ion

It was found spectroscopically that cobalt(II) acetate dissolved in glacial acetic acid forms the octahedral complex [Co(OAc)2(HOAc)4] which in the presence of bromide ions gives the octahedral [Co(OAc)Br(HOAc)4] and tetrahedral bromo(acetate)cobalt(II) complexes with the higher number of Br- ions. When attached to an organic polymer cobalt(II) ions are bonded in the form of octahedral [Co(H2O)6]2+ cations which form with acetic acid similar complexes as in homogeneous phase and are able to coordinate one bromide ion. Drying the copolymer possessing octahedral hexaaquocobalt(II) cations leads to tetrahedral aquocomplexes which are solvated by gaseous acetic acid and converted into the acetate complexes with the liquid acid. The latter contain the acid in the inner coordination sphere and have tetrahedral symmetry.

Photooxidation effect of cupric complexes on aliphatic alcohols in nonaqueous solutions

1982 ◽  
Vol 47 (8) ◽  
pp. 2061-2068 ◽  
Author(s):  
Jan Sýkora ◽  
Mária Jakubcová ◽  
Zuzana Cvengrošová
Keyword(s):  
Coordination Sphere ◽  
Alcohol Oxidation ◽  
Aliphatic Alcohols ◽  
Oxidation Products ◽  
Molar Ratio ◽  
Quantum Yields ◽  
Nonaqueous Solutions ◽  
The Absolute ◽  
Absolute Quantum

In the photolysis of copper(II)-chloride-alcohol-acetonitrile systems (cCu = 1 mmol l-1, copper(II)-to-chloride molar ratio 1 : 2 to 1 : 8, 10% (v/v) alcohol), Cu(II) is reduced to Cu(I), and methanol, ethanol, 1-propanol, or 1-butanol is oxidized to the corresponding aldehyde, 2-propanol to acetone. In the case of 1-propanol and 1-butanol, chlorinated aldehydes are formed in addition too. The measured quantum yields of the photoreduction of Cu(II) to Cu(I) lay in the range of ΦCu(I) = 4.5 to 40 mmol einstein-1, the absolute quantum yields of the alcohol oxidation products were 2.3 to 47 mmol einstein-1. The photoactive components are chlorocupric complexes [CuClx](2-x)+ (x = 1-4). The presence of complexes with a higher number of chloroligands in the coordination sphere (x = 3, 4) brings about a decrease in the Cu(II) photoreduction rate. The decrease in the photoreduction rate observed in the presence of dioxygen is explained in terms of re-oxidation of copper(I) by the latter, resulting in an increase in the concentration of the photochemically active cupric complexes. The catalytic aspects of the systems in question are discussed with respect to this effect.

Complexes of copper(II) and nickel(II) with a Schiff base bonded to a polymeric support

1983 ◽  
Vol 48 (7) ◽  
pp. 2021-2027 ◽  
Author(s):  
Eliška Kálalová ◽  
Olga Populová ◽  
Štěpánka Štokrová ◽  
Pavel Stopka
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Coordination Sphere ◽  
Polymer Matrix ◽  
Glycidyl Methacrylate ◽  
Epr Spectra ◽  
Polymeric Support ◽  
Tetrahedral Configuration ◽  
Paramagnetic Complexes

Copper(II) and nickel(II) ions were bonded in complexes of salicylideneimine type on a glycidyl methacrylate-ethylenedimethacrylate copolymer. The geometry of the complexes on the polymer was studied by measuring their magnetic properties, EPR spectra, and ultraviolet-visible spectra.Only paramagnetic complexes possessing a pseudo-tetrahedral configuration were found. The effect of the polymer matrix and of the immobility of the bonded Schiff base on the distortion of the coordination sphere of the central ion is discussed.

Über den Mechanismus der Bildung von Polyanionen in wäßriger Lösung. Zum Bildungsmechanismus eines Polytetramolybdations [Mo4O144-]n / On the Mechanism of Formation of Polyanions in Aqueous Solution. Concerning the Mechanism of Formation of a Polytetramolybdate Ion [Mo4O144-]n

1976 ◽  
Vol 31 (6) ◽  
pp. 737-748 ◽  
Author(s):  
Karl-Heinz Tytko
Keyword(s):  
Aqueous Solution ◽  
Coordination Sphere ◽  
Analytical Formula ◽  
Reaction Pathways ◽  
Mechanism Of Formation ◽  
X Ray ◽  
Theoretical Considerations

Possible structures and the pertinent reaction pathways for the polymetalate ion present in a slightly soluble polymetalate having the analytical formula A2O · 2 MOs have been derived on the basis of theoretical considerations. Structure and kind of combination of the tetrameric units of one of the possibilities are in agreement with the results of X-ray structure analyses. First the previously proposed planar tetrametalate ion [M4O12(OH)4]4--is formed by stepwise aggregation according to an addition mechanism. This species undergoes a rearrangement of the coordination sphere of two of the M atoms and is then subject to a polycondensation resulting in a polytetrametalate chain, [M4O144-]n.

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