New metal-free catalytic degradation systems with carbon dots for thymol blue

2017 ◽  
Vol 41 (22) ◽  
pp. 13365-13369 ◽  
Author(s):  
Cui Zheng ◽  
Xueqin An ◽  
Tianxiang Yin
Keyword(s):  
Catalytic System ◽  
Carbon Dots ◽  
Aqueous Media ◽  
Catalytic Degradation ◽  
Thymol Blue ◽  
Metal Free

A metal-free catalytic system with carbon dots as a catalyst for thymol blue degradation in slightly alkaline aqueous media.

Dissociation of imino proton(s) of a highly water-soluble metal-free phthalocyanine and determination of its pKa value in water

2013 ◽  
Vol 17 (06n07) ◽  
pp. 447-453 ◽  
Author(s):  
Hiroaki Isago ◽  
Harumi Fujita
Keyword(s):  
Aqueous Media ◽  
Thermal Reaction ◽  
Water Soluble ◽  
Acid Dissociation ◽  
Acid Dissociation Constant ◽  
Metal Free ◽  
Imino Proton ◽  
Pka Value ◽  
Triton X

Dissociation of imino proton(s) in the cavity of the macrocycle of a highly water-soluble, metal-free phthalocyanine ( H 2( H 4 tsppc ); where H 4 tsppc denotes tetrakis{(2′,6′-dimethyl-4′-sulfonic acid)phenoxy}phthalocyaninate) in ethanolic and aqueous solutions has spectrophotometrically been investigated. The spectral changes associated with reaction with NaOH have been found to involve one-proton transfer process in aqueous media while two-protons process in ethanolic media. The acid-dissociation constant of the first imino proton in water (in the presence of Triton X-100) has been determined to be 12.5 ± 0.2 (as pKa) at 25 °C. The doubly deprotonated species in EtOH has been easily converted to its corresponding cobalt(II) derivative by thermal reaction with anhydrous CoCl 2.

scholarly journals Bis-NHC–Ag/Pd(OAc)2 Catalytic System Catalyzed Transfer Hydrogenation Reaction

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 8
Author(s):  
Hui-Ju Chen ◽  
Chien-Cheng Chiu ◽  
Tsui Wang ◽  
Dong-Sheng Lee ◽  
Ta-Jung Lu
Keyword(s):  
Functional Groups ◽  
Catalytic System ◽  
High Efficiency ◽  
Aqueous Media ◽  
Hydrogenation Reaction ◽  
Transfer Hydrogenation ◽  
Terminal Alkynes ◽  
Wide Range ◽  
Transfer Hydrogenation Reaction

The bis-NHC–Ag/Pd(OAc)2 catalytic system (NHC = N-heterocyclic carbene), a combination of bis-NHC–Ag complex and Pd(OAc)2, was found to be a smart catalyst in the Pd-catalyzed transfer hydrogenation of various functionalized arenes and internal/terminal alkynes. The catalytic system demonstrated high efficiency for the reduction of a wide range of various functional groups such as carbonyls, alkynes, olefins, and nitro groups in good to excellent yields and high chemoselectivity for the reduction of functional groups. In addition, the protocol was successfully exploited to stereoselectivity for the transformation of alkynes to alkenes in aqueous media under air. This methodology successfully provided an alternative useful protocol for reducing various functional groups and a simple operational protocol for transfer hydrogenation.

Catalytic degradation of methylene blue using iron and nitrogen-containing carbon dots as Fenton-like catalysts

2021 ◽  
Author(s):  
Sabrina A. Beker ◽  
Leadin S. Khudur ◽  
Ivan S Cole ◽  
Andy Ball
Keyword(s):  
Methylene Blue ◽  
Carbon Dots ◽  
Catalytic Degradation ◽  
Environmental Issue ◽  
Pollution Sources ◽  
Wastewater Pollution

Wastewater pollution is an existing and serious environmental issue. One of the main wastewater pollution sources is from the dyestuff industries and its discharge poses a serious threat to the...

scholarly journals Surfactant Micelles Enable Metal-Free Spirocyclization of Keto-Ynamides and Access to Aza-Spiro Scaffolds in Aqueous Media

2019 ◽  
Vol 2019 (41) ◽  
pp. 6989-6993
Author(s):  
Frédéric Beltran ◽  
Andrea V. Vela-Gonzalez ◽  
Tatiana Knaub ◽  
Marc Schmutz ◽  
Marie Pierre Krafft ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Surfactant Micelles ◽  
Metal Free

scholarly journals Noble metal-free upgrading of multi-unsaturated biomass derivatives at room temperature: silyl species enable reactivity

2018 ◽  
Vol 20 (23) ◽  
pp. 5327-5335 ◽  
Author(s):  
Hu Li ◽  
Wenfeng Zhao ◽  
Wenshuai Dai ◽  
Jingxuan Long ◽  
Masaru Watanabe ◽  
...  
Keyword(s):  
Noble Metal ◽  
Catalytic System ◽  
Room Temperature ◽  
Metal Free

A simple and robust catalytic system is described for the controllable conversion of biomass-derived chemicals.

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