Characterization of Silica-Supported Vanadium(V) Complexes Derived from Molecular Precursors and Their Ligand Exchange Reactions

Langmuir ◽  
1997 ◽  
Vol 13 (6) ◽  
pp. 1545-1551 ◽  
Author(s):  
Gordon L. Rice ◽  
Susannah L. Scott
Keyword(s):  
Ligand Exchange ◽  
Exchange Reactions ◽  
Molecular Precursors

Synthesis and Characterization of Strontium Bis(N-isopropylanilide) and Comparison with the Lighter Magnesium and Calcium Congeners

2013 ◽  
Vol 68 (5-6) ◽  
pp. 518-532 ◽  
Author(s):  
Claas Loh ◽  
Carsten Glock ◽  
Steffen Ziemann ◽  
Helmar Görls ◽  
Sven Krieck ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Synthesis And Characterization ◽  
Alkaline Earth Metal ◽  
Similar Reaction ◽  
Exchange Reactions ◽  
Metathesis Reaction ◽  
Short Contacts

The metathesis reaction of strontium diiodide [(thf)5SrI2] with K[N(Ph)iPr] in THF yields [(thf)4Sr{N(Ph)iPr}2] (1). Ligand exchange reactions with 1,2-dimethoxyethane (DME), tetramethylethylenediamine (TMEDA), and pentamethyldiethylenetriamine (PMDETA) allow the isolation of the corresponding adducts [(dme)2Sr{N(Ph)iPr}2] (2), [(tmeda)(thf)Sr{N(Ph)iPr}2] (3) and [(pmdeta)Sr{N(Ph)iPr}2] (4), respectively. Magnesiation of N-isopropylaniline with dibutylmagnesium in THF leads to the formation of [(thf)2Mg{N(Ph)iPr}2] (5). A similar reaction in TMEDA gives nearly insoluble crystalline [(tmeda)Mg{N(Ph)iPr}2] (7), whereas the mother liquor contains heteroleptic [(tmeda)(nBu)Mg{N(Ph)iPr}] (6). Magnesiation of N-isopropylaniline in 2,2,5,5-tetramethyltetrahydrofuran (Me4thf) yields [(Me4thf)Mg{N(Ph)iPr}2] (8) with a threecoordinate metal center. In hydrocarbons this complex loses the bulky ether base, and the solvent-free dimer [Mg{N(Ph)iPr}2]2 (9) can be isolated. Reaction of this complex with 1,2- dimethoxyethane or metalation of N-isopropylaniline with dibutylmagnesium in DME yield the dme adduct, [(dme)Mg{N(Ph)iPr}2] (10). The crystal structures show that the nitrogen atoms of the magnesium-bound N-isopropylanilide ions are in planar environments whereas strontium-bound N-isopropylanilide ions show rather short contacts between the alkaline earth metal and the ipsocarbon atoms of the phenyl groups leading to a pyramidalization of the coordination of the nitrogen atoms

Characterization of the Ligand Exchange Reactions on CdSe/ZnS QDs by Capillary Electrophoresis

Langmuir ◽  
2019 ◽  
Vol 35 (14) ◽  
pp. 4806-4812 ◽  
Author(s):  
Nannan Wei ◽  
Ling Li ◽  
Huige Zhang ◽  
Weifeng Wang ◽  
Congjie Pan ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Ligand Exchange ◽  
Exchange Reactions

Voltammetric Studies of Some Novel Fe(III) Complexes with Quadridentate Ligands. The Axial Ligand-Exchange Reactions in DMF and DMSO

1995 ◽  
Vol 60 (7) ◽  
pp. 1140-1157 ◽  
Author(s):  
Ljiljana S. Jovanovic ◽  
Luka J. Bjelica
Keyword(s):  
Oxidation State ◽  
Chemical Reactions ◽  
Ligand Exchange ◽  
Kinetic Data ◽  
Central Atom ◽  
Axial Ligand ◽  
Exchange Reactions ◽  
Ligand Effect ◽  
Condensation Products ◽  
Voltammetric Studies

The electrochemistry of four novel Fe(III) complexes of the type [Fe(L)Cl], involving quadridentate ligands based on the condensation products of benzoylacetone-S-methylisothiosemicarbazone with salicylaldehyde, 5-chlorosalicylaldehyde, 3,5-dichlorosalicylaldehyde or 5-nitrosalicylaldehyde, was studied in DMF and DMSO at a GC electrode. All complexes undergo a two-step one-electron reductions, usually complicated by chemical reactions. In solutions containing Cl-, the ligand-exchange reactions Cl--DMF and Cl--DMSO take place. Stability of the chloride-containing complexes was discussed in terms of the coordinated ligand effect, oxidation state of the central atom and, in particular, of the donor effect of the solvent. Some relevant kinetic data were calculated.

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