Dynamic behaviour attributed to chiral carbohydrate substituents of N-heterocyclic carbene ligands in square planar nickel complexes

2011 ◽  
Vol 40 (25) ◽  
pp. 6778 ◽  
Author(s):  
Teppei Shibata ◽  
Satoru Ito ◽  
Matsumi Doe ◽  
Rika Tanaka ◽  
Hideki Hashimoto ◽  
...  
Keyword(s):  
Dynamic Behaviour ◽  
Nickel Complexes ◽  
Carbene Ligands ◽  
Square Planar

Übergangsmetallkomplexe mit Schwefelliganden, LXXVI Redox- und Additionsreaktionen von Nickelkomplexen mehrzähniger Thioether-Thiolat-Liganden. Röntgenstrukturanalysen von (NMe4)2[Ni(′S2′)2] und [Ni(′S4 – C3′)(PMe3)] / Transition Metal Complexes with Sulfur Ligands, LXXVI Redox and Addition Reactions of Nickel Complexes with Multidentate Thioether-Thiolato Ligands. X-Ray Structure Determinations of (NMe4)2[Ni(′S2′)2] and [Ni(′S4–C3′)(PMe3)]

1991 ◽  
Vol 46 (12) ◽  
pp. 1601-1608 ◽  
Author(s):  
Dieter Sellmann ◽  
Stefan Fünfgelder ◽  
Falk Knoch ◽  
Matthias Moll
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Structure Analysis ◽  
Transition Metal Complexes ◽  
Nickel Complexes ◽  
Addition Reactions ◽  
Coordination Geometry ◽  
X Ray ◽  
Square Planar ◽  
Structure Determinations

In order to elucidate specific properties of nickel sulfur complexes, redox and addition-elimination reactions of [Ni(′OS4')]2, [Ni(′NHS4')]2, [Ni(′S5')], [Ni('S4—C5')], and [Ni('S4—C3')] were investigated ('OS4′ 2' = 2,2'-bis(2-mercaptophenylthio)diethylether(2—), 'NHS4'2- = 2,2'-bis(2-mercaptophenylthio)diethylamine(2—), 'S5'2- = 2,2'-bis(2-mercaptophenylthio)diethylsulfide(2—), 'S4-C5'2- = 1,5-bis(2-mercaptophenylthio)pentane(2—), 'S4—C3'2- = 1,3-bis(2-mercaptophenylthio)propane(2—)).Cyclovoltammetry proves the complexes to be redox inactive between —1.4 and +0.8 V vs. NHE. Above +0.8 V the complexes are irreversibly oxidized, below —1,4 V desalkylation takes place and [Ni(′S,′)2]2- is formed. An X-ray structure analysis was carried out of (NMe4)2[Ni(′S2')2], which shows a planar anion with the Ni center in a nearly perfect square planar coordination. Distances and angles are practically identical to those in the [Ni(′S2')2-] monoanion.The complexes coordinate only phosphines as coligands, but thioether donors simultaneously decoordinate and, dependant of reaction temperature, mono- or trisphosphine complexes are formed. [Ni(′S4—C3')(PMe3)] was characterized by X-ray structure analysis and exhibits a square pyramidal coordination geometry.

scholarly journals Rhodium(i) complexes with carborane-substituted P,N ligands: investigations of electronic structure and dynamic behaviour

2019 ◽  
Vol 48 (26) ◽  
pp. 9625-9630 ◽  
Author(s):  
Peter Coburger ◽  
Gizem Kahraman ◽  
Axel Straube ◽  
Evamarie Hey-Hawkins
Keyword(s):  
Electronic Structure ◽  
Dynamic Behaviour ◽  
Square Planar

Two distorted square-planar RhI complexes (1 and 2) were obtained from [{RhCl(η4-cod)}2] and the respective P,N ligands.

Nickel complexes of ligands derived from (o-hydroxyphenyl) dichalcogenide: delocalised redox states of nickel and o-chalcogenophenolate ligands

2019 ◽  
Vol 48 (46) ◽  
pp. 17355-17363 ◽  
Author(s):  
Sridhar Banerjee ◽  
Debobrata Sheet ◽  
Subhash Sarkar ◽  
Partha Halder ◽  
Tapan Kanti Paine
Keyword(s):  
Metal Ion ◽  
Nickel Complexes ◽  
Redox States ◽  
Square Planar

The monoanionic square planar S = 1/2 nickel complexes of dianionic o-chalcogenophenolate ligands display delocalised redox states of the metal ion and ligands.

Enhancement of Second Hyperpolarizabilities in Open-Shell Singlet Slipped-Stack Dimers Composed of Square Planar Nickel Complexes Involvingo-Semiquinonato Type Ligands

2011 ◽  
Vol 115 (6) ◽  
pp. 1117-1124 ◽  
Author(s):  
Hitoshi Fukui ◽  
Yasuteru Shigeta ◽  
Masayoshi Nakano ◽  
Takashi Kubo ◽  
Kenji Kamada ◽  
...  
Keyword(s):  
Nickel Complexes ◽  
Open Shell ◽  
Square Planar

scholarly journals Nickel complexes of 1,2,4-triazole derived amido-functionalized N-heterocyclic carbene ligands: Synthesis, theoretical studies and catalytic application

2015 ◽  
Vol 786 ◽  
pp. 63-70 ◽  
Author(s):  
Anuj Kumar ◽  
Linus Paulin Bheeter ◽  
Manoj Kumar Gangwar ◽  
Jean-Baptiste Sortais ◽  
Christophe Darcel ◽  
...  
Keyword(s):  
Nickel Complexes ◽  
Theoretical Studies ◽  
Carbene Ligands ◽  
Catalytic Application

Synthesis and Characterization of Linear and Square-Planar Nickel Complexes with Primary Amido Ligands

2008 ◽  
Vol 47 (9) ◽  
pp. 3468-3470 ◽  
Author(s):  
Jianfeng Li ◽  
Haibin Song ◽  
Chunming Cui ◽  
Jin-Pei Cheng
Keyword(s):  
Nickel Complexes ◽  
Synthesis And Characterization ◽  
Amido Ligands ◽  
Square Planar

Fluorinated Alkoxides. Part VIII. Mixed Ligand Complexes of Perfluoropinacol with Ni2+, Pd2+, Pt2+ and Cu2+. Solvation Equilibria between 4- and 5-coordinate Ni2+

1975 ◽  
Vol 53 (6) ◽  
pp. 809-816 ◽  
Author(s):  
W. Stafford Cripps ◽  
Christopher J. Willis
Keyword(s):  
Metal Ion ◽  
Nickel Complexes ◽  
Mixed Ligand ◽  
Ligand Field ◽  
Electronic Effects ◽  
Unusual Behavior ◽  
Planar Structures ◽  
Square Planar ◽  
Phosphorus Containing ◽  
Fluorinated Alkoxides

Perfluoropinacol, (CF3)2C(OH)C(OH)(CF3)2, ionizes by loss of two protons, and the resulting dinegative ion (PFP2−) chelates to Ni2+, Pd2+, Pt2+, and Cu2+. A variety of stable neutral complexes may be isolated if the tetracoordination of the metal ion is completed with two monodentate or one bidentate nitrogen- or phosphorus-containing ligands; square-planar structures are invariably found. The structures of these complexes are contrasted with those of analogous halides, and it is concluded that electronic effects are predominant in determining them, although steric influences may sometimes be important. The ligand field strength of the perfluoropinacolato ion is approximately equal to that of the thiocyanate ion.The nickel complexes Ni(PFP)22− and (PFP)Ni(RNHCH2CH2NHR) react with donor solvents (water, methanol, pyridine, etc.) to give equilibria between four- and five-coordinate solvated species; six-coordinate species are not observed. This unusual behavior is attributed to the steric hindrance imposed by the bulk of the PFP2− ligand.

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