scholarly journals Ligand exchange in zirconocene dichloride–diethylzinc bimetallic systems

2021 ◽  
Author(s):  
Oleg Mozgovoj ◽  
Rita Kadikova ◽  
Lyudmila Parfenova ◽  
Leonard Khalilov ◽  
Usein Dzhemilev
Keyword(s):  
Exchange Reaction ◽  
Spectral Data ◽  
Thermodynamic Stability ◽  
Ligand Exchange ◽  
Benzene Solution ◽  
Zirconocene Dichloride ◽  
Bimetallic Systems

The reaction between zirconocene dichloride and excess diethylzinc in d-6-benzene solution was studied. It was found that the exchange reaction between Cp2ZrCl2 and Et2Zn is accompanied by the formation of such complexes as bis-(cyclopentadienyl)ethylzirconium chloride (EtZrCp2Cl), a zirconium-organozinc complex, and bis-(cyclopentadienyl)diethylzirconium (Et2ZrCp2). It was also found that as a result of ligand exchange in zirconocene dichloride–diethylzinc bimetallic systems, the zirconium-organozinc complex is formed in minor amounts. An assessment of the thermodynamic stability of the obtained products is given based on the results of DFT analysis. The description of the NMR spectral data of the obtained organozirconium complexes is carried out.

scholarly journals Ligand exchange in zirconocene dichloride–diethylzinc bimetallic systems

2021 ◽  
Author(s):  
Oleg Mozgovoj ◽  
Rita Kadikova ◽  
Ilfir Ramazanov ◽  
Leonard Khalilov ◽  
Usein Dzhemilev
Keyword(s):  
Exchange Reaction ◽  
Spectral Data ◽  
Thermodynamic Stability ◽  
Ligand Exchange ◽  
Benzene Solution ◽  
Zirconocene Dichloride ◽  
Bimetallic Systems

The reaction between zirconocene dichloride and excess diethylzinc in d-6-benzene solution was studied. It was found that the exchange reaction between Cp2ZrCl2 and Et2Zn is accompanied by the formation of such complexes as bis-(cyclopentadienyl)ethylzirconium chloride (EtZrCp2Cl), a zirconium-organozinc complex, and bis-(cyclopentadienyl)diethylzirconium (Et2ZrCp2). It was also found that as a result of ligand exchange in zirconocene dichloride–diethylzinc bimetallic systems, the zirconium-organozinc complex is formed in minor amounts. An assessment of the thermodynamic stability of the obtained products is given based on the results of DFT analysis. The description of the NMR spectral data of the obtained organozirconium complexes is carried out.

Ligand exchange processes in zirconocene dichloride–trimethylaluminum bimetallic systems and their catalytic properties in reaction with alkenes

2018 ◽  
Vol 47 (47) ◽  
pp. 16918-16937 ◽  
Author(s):  
Lyudmila V. Parfenova ◽  
Pavel V. Kovyazin ◽  
Vener Z. Gabdrakhmanov ◽  
Galina P. Istomina ◽  
Pavel V. Ivchenko ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Catalytic Properties ◽  
Zirconocene Dichloride ◽  
Bimetallic Systems ◽  
Exchange Processes ◽  
System L

The exchange processes in the system L2ZrCl2–(AlMe3)2 and its reactivity towards the alkene were studied.

F−(H2O)+CH3I ligand exchange reaction dynamics

2020 ◽  
Vol 33 (2) ◽  
pp. 210-216
Author(s):  
Björn Bastian ◽  
Tim Michaelsen ◽  
Milan Ončák ◽  
Jennifer Meyer ◽  
Roland Wester
Keyword(s):  
Exchange Reaction ◽  
Ligand Exchange ◽  
Reaction Dynamics ◽  
Ligand Exchange Reaction

scholarly journals The fundamental flaw of the HSAB principle is revealed by a complete speciation analysis of the [PtCl6−nBrn]2−(n = 0–6) system

2015 ◽  
Vol 17 (8) ◽  
pp. 5712-5724 ◽  
Author(s):  
W. J. Gerber ◽  
P.-H. van Wyk ◽  
D. M. E. van Niekerk ◽  
K. R. Koch
Keyword(s):  
Exchange Reaction ◽  
Ligand Exchange ◽  
Equilibrium Constants ◽  
Reaction Network ◽  
Speciation Analysis ◽  
Hsab Principle ◽  
Speciation Diagram ◽  
System P

Bjerrum's model of step-wise ligand exchange is extended to compute a complete speciation diagram for the [PtCl6−nBrn]2−(n= 0–6) system including all 17 equilibrium constants concerning the PtIVchlorido–bromido exchange reaction network (HERN).

An all-in-one approach for synthesis and functionalization of nano colloidal gold with acetylacetone

2021 ◽  
Author(s):  
Li Zhang ◽  
Hongcen Zheng ◽  
Yonghai Gan ◽  
Bingdang Wu ◽  
Zhihao Chen ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Ligand Exchange ◽  
Fold Increase ◽  
Charge Transfer Complexes ◽  
Photochemical Property ◽  
Exchange Reactions ◽  
Ligand Exchange Reaction ◽  
Enhanced Photoluminescence ◽  
Good Imaging ◽  
Imaging Probes

Abstract Controllable synthesis, proper dispersion, and feasible functionalization are crucial requirements for the application of nanomaterials in many scenarios. Here, we report an all-in-one approach for the synthesis and functionalization of gold nanoparticles (AuNPs) with the simplest β-diketone, acetylacetone (AcAc). With this approach, the particle size of the resultant AuNPs was tunable by simply adjusting the light intensity or AcAc dosage. Moreover, owing to the capping role of AcAc, the resultant AuNPs could be stably dispersed in water for a year without obvious change in morphology and photochemical property. Formation of ligand to metal charge transfer complexes was found to play an important role in the redox conversion of Au with AcAc. Meanwhile, the moderate complexation ability enables the surface AcAc on the AuNPs to undergo ligand exchange reactions. With the aid of Ag+, the AuNPs underwent ligand exchange reaction with glutathione and exhibited enhanced photoluminescence (PL) with a maximum of 22-fold increase in PL intensity. The PL response was linear to the concentration of glutathione in the range of 0~500 μM. Such a ligand exchange reaction makes the obtained AuNPs being good imaging probes. To the best of our knowledge, this is the first work on illustrating the roles of AcAc as a multifunctional ligand in fabrication of NPs, which sheds new light on the surface modulation in synthesis of nanomaterials.

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