Substituent changes in the salen ligands of CuIINaI-complexes to induce various structures and catalytic activities towards 2-imidazolines from nitriles and 1,2-diaminopropane

2019 ◽  
Vol 55 (32) ◽  
pp. 4619-4622
Author(s):  
Quan-Quan Li ◽  
Peng-Xiu He ◽  
Jin Zhang ◽  
Ji-Dong Zhang ◽  
Yu-Meng Xin ◽  
...  
Keyword(s):  
Catalytic Activities ◽  
Salen Complexes ◽  
Salen Ligands ◽  
First Time

We, for the first time, describe the effect of different salen substituents on the synthesis of 2-imidazolines catalyzed by CuIINaI-salen complexes.

Ligand-centred oxidative chemistry in sterically hindered salen complexes: an interesting case with nickel

2016 ◽  
Vol 45 (27) ◽  
pp. 10866-10877 ◽  
Author(s):  
F. Thomas
Keyword(s):  
Nickel Complexes ◽  
Redox Chemistry ◽  
Interesting Case ◽  
Salen Complexes ◽  
Sterically Hindered ◽  
Salen Ligands

Salen ligands are ubiquitous chelators, whose nickel complexes readily undergo a ligand-centred redox chemistry in non-coordinating solvents.

scholarly journals Sandwich type polyoxometalates encapsulated into the mesoporous material: synthesis, characterization and catalytic application in the selective oxidation of sulfides

RSC Advances ◽  
2018 ◽  
Vol 8 (49) ◽  
pp. 28249-28260 ◽  
Author(s):  
Elham Naseri ◽  
Roushan Khoshnavazi
Keyword(s):  
Selective Oxidation ◽  
Mesoporous Material ◽  
Room Temperature ◽  
Material Synthesis ◽  
Catalytic Activities ◽  
Oxidation Of Sulfides ◽  
Catalytic Application ◽  
Sandwich Type ◽  
First Time ◽  
Sandwich Type Polyoxometalates

The A-type sandwich POMs of [(HOSnIVOH)3(PW9O34)2]12– (P2W18Sn3) and [(OCeIVO)3(PW9O34)2]12– (P2W18Ce3) were immobilized for the first time into the porous MIL-101 MOF. Their catalytic activities were examined in the oxidation of sulfides to sulfones at room temperature.

Highly efficient metal(iii) porphyrin and salen complexes for the polymerization of rac-lactide under ambient conditions

2019 ◽  
Vol 48 (10) ◽  
pp. 3223-3230 ◽  
Author(s):  
Siriwan Praban ◽  
Parichat Piromjitpong ◽  
Vagulejan Balasanthiran ◽  
Savithra Jayaraj ◽  
Malcolm H. Chisholm ◽  
...  
Keyword(s):  
Room Temperature ◽  
Ambient Conditions ◽  
Highly Efficient ◽  
Salen Complexes ◽  
Salen Ligands ◽  
Lactide Polymerization

Metal(iii) complexes supported by porphyrin and salen ligands were highly efficient for rac-lactide polymerization at room temperature giving isotactic-enriched PLA.

One-pot atom-efficient synthesis of bio-renewable polyesters and cyclic carbonates through tandem catalysis

2015 ◽  
Vol 51 (40) ◽  
pp. 8504-8507 ◽  
Author(s):  
Fan Jia ◽  
Xiaoyu Chen ◽  
Yan Zheng ◽  
Yusheng Qin ◽  
Youhua Tao ◽  
...  
Keyword(s):  
Tandem Reaction ◽  
Cyclic Carbonates ◽  
Tandem Catalysis ◽  
Efficient Synthesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Salen Complexes ◽  
High Yields ◽  
First Time

One-pot synthesis of well-defined bio-renewable polyesters and cyclic carbonates in high yields was successfully realized for the first time by way of a tandem reaction using metal salen complexes as catalysts.

Stable iridium(iv) complexes supported by tetradentate salen ligands. Synthesis, structures and reactivity

2019 ◽  
Vol 55 (25) ◽  
pp. 3606-3609 ◽  
Author(s):  
Chi Lun Lee ◽  
Liangliang Wu ◽  
Jie-Sheng Huang ◽  
Chi-Ming Che
Keyword(s):  
Crystal Structures ◽  
Catalytic Properties ◽  
Aryl Azides ◽  
X Ray ◽  
Salen Complexes ◽  
Salen Ligands

Here we report the synthesis, spectroscopy and X-ray crystal structures of mononuclear trans-dichloroiridium(iv)–salen complexes and their catalytic properties for intramolecular C–H amination of aryl azides.

scholarly journals Kinetically Controlled Growth And Shape Formation Mechanism Of Platinum Nanoparticles

1998 ◽  
Vol 4 (S2) ◽  
pp. 746-747
Author(s):  
Janet M. Petroski ◽  
Zhong L. Wang ◽  
Travis C. Green ◽  
Mostafa A. El-Sayed
Keyword(s):  
Platinum Nanoparticles ◽  
Polymer Concentration ◽  
Pt Nanoparticles ◽  
Colloidal Nanoparticles ◽  
Shape Distribution ◽  
Catalytic Activities ◽  
Stages Of Growth ◽  
Transmission Electron ◽  
Different Shapes ◽  
First Time

Many studies on colloidal nanoparticles have focused on the control of nanoparticle size and correlated this to the catalytic activity. Recently, our group has reported for the first time a technique that controlled the shape distribution of Pt nanoparticles. This was done by varying the concentration of the capping polymer and the platinum ion ratio used in the reductive synthesis of colloidal nanoparticles at room temperature. Cubic, tetrahedral and truncated octahedral (TO) particles have been prepared, making it possible to study the catalytic activities of nanoparticles with different shapes and facets.Using transmission electron microscopy (TEM), we imaged the shapes and determined the shape distribution of platinum nanoparticles at different stages of their growth as a function of time. The small nanoparticles formed during the early stages of growth or at high polymer concentration displayed distributions with a dominance of tetrahedral shapes (see Figure la).

Metal-free and metal porphyrins: A highly efficient catalysts to Li/SOCl2 battery

2015 ◽  
Vol 19 (12) ◽  
pp. 1219-1224 ◽  
Author(s):  
Na Li ◽  
Chong Dang ◽  
Wanjun Sun ◽  
Jinning Dang ◽  
Xinsheng Lu ◽  
...  
Keyword(s):  
Thionyl Chloride ◽  
Discharge Time ◽  
Metal Free ◽  
Catalytic Activities ◽  
Metal Porphyrins ◽  
Highly Efficient ◽  
High Efficient ◽  
Battery Discharge ◽  
First Time

Two metal-free porphyrins H[Formula: see text]Pp (a, b) and four metalloporphyrins CuPp (a, b) and ZnPp (a, b) have been applied to lithium/thionyl chloride (Li/SOCl[Formula: see text] battery as the high efficient catalysts for the first time. Notably, the battery discharge time in blank is only 1080 s while that of Li/SOCl2 battery after adding porphyrin/metalloporphyrins is 1980 s for H[Formula: see text]Pp (a), 2160 s for H[Formula: see text]Pp (b), 1560 s for CuPp (a), 1320 s for CuPp (b), 1620 s for ZnPp (a), and 1680 s for ZnPp (b), respectively. Furthermore, the energy of the battery whose electrolyte contains the H[Formula: see text]Pp (a, b), CuPp (a, b) and ZnPp (a, b) increases by approximately 11.88–77.14% than that of the battery without them. And the metal-free porphyrins H[Formula: see text]Pp (a) or H[Formula: see text]Pp (b) exhibit higher catalytic activities than that of metalloporphyrins CuPp (a, b) and ZnPp (a, b). In addition, the possible reasons to explain the excellent results were also analyzed.

Application of nickel ferrite and cobalt ferrite magnetic nanoparticles in C–O bond formation: a comparative study between their catalytic activities

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 59142-59153 ◽  
Author(s):  
Firouz Matloubi Moghaddam ◽  
Ghazal Tavakoli ◽  
Ali Aliabadi
Keyword(s):  
Magnetic Nanoparticles ◽  
Comparative Study ◽  
Nickel Ferrite ◽  
Cobalt Ferrite ◽  
Bond Formation ◽  
Coupling Reaction ◽  
Ferrite Nanoparticles ◽  
Catalytic Activities ◽  
Cobalt Ferrite Nanoparticles ◽  
First Time

Magnetic reusable nickel- and cobalt ferrite nanoparticles were used as catalysts for the first time in the C–O coupling reaction successfully.

Electronic Effect of Fluoro Substituents on Chromium(III) Complexes bearing β-Diketiminate Ligands for Ethylene Polymerization

2012 ◽  
Vol 476-478 ◽  
pp. 2201-2204 ◽  
Author(s):  
Guang Yong Xie ◽  
Xiang Zhang ◽  
Xiao Hang Xu ◽  
Ting Cheng Li ◽  
Ai Qing Zhang
Keyword(s):  
Reaction Temperature ◽  
Ethylene Polymerization ◽  
Electronic Effect ◽  
Reaction Parameters ◽  
Catalytic Activities ◽  
Alkyl Groups ◽  
Elemental Analyses ◽  
First Time ◽  
Catalytic Performances

A series of new chromium(III) complexes bearing fluoro-substituted β-diketiminate ligands have been synthesized and characterized by IR and elemental analyses. When activated by modified methylaluminoxane (MMAO), these Cr complexes exhibited moderate or high activities for ethylene polymerization (up to 370 g.mmol-1.h-1). Various reaction parameters such as reaction temperature and Al/Cr ratio were investigated in detail. Further more, it was found for the first time that the catalytic behaviors of Cr complexes can be greatly influenced by the electronic effect of fluoro substituents. The introduction of electron-withdrawing fluoro groups to ligands can improve the catalytic performances compared with those bearing alkyl groups, but incorporation of more fluoro atoms would then decrease the catalytic activities.

Chiral Zn–salen complexes: a new class of fluorescent receptors for enantiodiscrimination of chiral amines

2017 ◽  
Vol 41 (3) ◽  
pp. 911-915 ◽  
Author(s):  
Roberta Puglisi ◽  
Francesco P. Ballistreri ◽  
Chiara M. A. Gangemi ◽  
Rosa Maria Toscano ◽  
Gaetano A. Tomaselli ◽  
...  
Keyword(s):  
Chiral Amines ◽  
New Class ◽  
Enantiomeric Discrimination ◽  
Highly Efficient ◽  
Salen Complexes ◽  
First Time

Highly efficient enantiomeric discrimination of chiral amines by fluorescent Zn–salen receptors is reported for the first time.

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