Chiral carbon dots based on L/D-cysteine produced via room temperature surface modification and one-pot carbonization

Nanoscale ◽  
2021 ◽  
Author(s):  
Ananya Das ◽  
Irina A. Arefina ◽  
Denis V. Danilov ◽  
Aleksandra V. Koroleva ◽  
Evgeniy V. Zhizhin ◽  
...  
Keyword(s):  
Surface Modification ◽  
Carbon Dots ◽  
Room Temperature ◽  
Optically Active ◽  
One Pot ◽  
Chiral Compounds ◽  
Chiral Carbon ◽  
Temperature Surface

Since the chirality is one of the phenomena often occurring in nature, optically active chiral compounds are important for applications in the fields of biology, pharmacology, and medicine. With this...

Formation Mechanism and Chirality Evolution of Chiral Carbon Dots Prepared via Radical Assisted Synthesis at Room Temperature

Nanoscale ◽  
2021 ◽  
Author(s):  
Lorenzo Branzi ◽  
Giacomo Lucchini ◽  
Elti Cattaruzza ◽  
Nicola Pinna ◽  
Alvise Benedetti ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Formation Mechanism ◽  
Carbon Dots ◽  
Room Temperature ◽  
Chiral Carbon

We report on a Cu(II) catalyzed process for the production of cysteine based chiral carbon dots, the process does not require any thermal treatment and the carbon dots formation is...

One pot selective synthesis of water and organic soluble carbon dots with green fluorescence emission

RSC Advances ◽  
2015 ◽  
Vol 5 (15) ◽  
pp. 11667-11675 ◽  
Author(s):  
Baozhan Zheng ◽  
Tao Liu ◽  
Man Chin Paau ◽  
Meina Wang ◽  
Yang Liu ◽  
...  
Keyword(s):  
Energy Saving ◽  
Carbon Dots ◽  
Room Temperature ◽  
Fluorescence Emission ◽  
Water Soluble ◽  
Selective Synthesis ◽  
Green Fluorescence ◽  
One Pot ◽  
Soluble Carbon

This work reports a simple and energy-saving strategy for selective synthesis of water-soluble and organic-soluble carbon dots at room temperature.

One-pot synthesis of nanoscale carbon dots-embedded metal–organic frameworks at room temperature for enhanced chemical sensing

2016 ◽  
Vol 4 (41) ◽  
pp. 15880-15887 ◽  
Author(s):  
Longhua Xu ◽  
Guozhen Fang ◽  
Jifeng Liu ◽  
Mingfei Pan ◽  
Ranran Wang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Chemical Sensing ◽  
Room Temperature ◽  
Metal Organic Frameworks ◽  
One Pot ◽  
Carbon Dot ◽  
One Pot Synthesis ◽  
Metal Organic

One-pot synthesis of nanoscale carbon dot-embedded metal–organic frameworks for enhanced chemical sensing.

scholarly journals Oil-Dispersible Green-Emitting Carbon Dots: New Insights on a Facile and Efficient Synthesis

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3716
Author(s):  
Gianluca Minervini ◽  
Annamaria Panniello ◽  
Elisabetta Fanizza ◽  
Angela Agostiano ◽  
Maria Lucia Curri ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Room Temperature ◽  
Cetylpyridinium Chloride ◽  
Cost Effective ◽  
Aqueous System ◽  
Synthetic Approach ◽  
One Pot ◽  
Light Emitting Devices ◽  
Water Dispersible ◽  
Reliable Mechanism

Carbon dots (CDs) have been progressively attracting interest as novel environmentally friendly and cost-effective luminescent nanoparticles, for implementation in light-emitting devices, solar cells, photocatalytic devices and biosensors. Here, starting from a cost-effective bottom-up synthetic approach, based on a suitable amphiphilic molecule as carbon precursor, namely cetylpyridinium chloride (CPC), green-emitting CDs have been prepared at room temperature, upon treatment of CPC with concentrated NaOH solutions. The investigated method allows the obtaining, in one-pot, of both water-dispersible (W-CDs) and oil-dispersible green-emitting CDs (O-CDs). The study provides original insights into the chemical reactions involved in the process of the carbonization of CPC, proposing a reliable mechanism for the formation of the O-CDs in an aqueous system. The ability to discriminate the contribution of different species, including molecular fluorophores, allows one to properly single out the O-CDs emission. In addition, a mild heating of the reaction mixture, at 70 °C, has demonstrated the ability to dramatically decrease the very long reaction time (i.e. from tens of hours to days) at room temperature, allowing us to synthesize O-CDs in a few tens of minutes while preserving their morphological and optical properties.

Room Temperature Flow Electrochemistry as a Means of Retaining the “Memory of Chirality” via Hofer Moest Type Reaction

2020 ◽  
Author(s):  
Tomas Hardwick ◽  
Rossana Cicala ◽  
Nisar Ahmed
Keyword(s):  
Continuous Flow ◽  
Room Temperature ◽  
Biological Activities ◽  
Supporting Electrolyte ◽  
Enantiomeric Excess ◽  
Flow Chemistry ◽  
Batch Processes ◽  
Enabling Technology ◽  
Chiral Compounds ◽  
Memory Of Chirality

<p>Many chiral compounds have become of great interest to the pharmaceutical industry as they possess various biological activities. Concurrently, the concept of “memory of chirality” has been proven as a powerful tool in asymmetric synthesis, while flow chemistry has begun its rise as a new enabling technology to add to the ever increasing arsenal of techniques available to the modern day chemist. Here, we have employed a new simple electrochemical microreactor design to oxidise an L-proline derivative at room temperature in continuous flow. Flow performed in microreactors offers up a number of benefits allowing reactions to be performed in a more convenient and safer manner, and even allow electrochemical reactions to take place without a supporting electrolyte due to a very short interelectrode distance. By the comparison of electrochemical oxidations in batch and flow we have found that continuous flow is able to outperform its batch counterpart, producing a good yield (71%) and a better enantiomeric excess (64%) than batch with a 98% conversion. We have, therefore, provided evidence that continuous flow chemistry has the potential to act as a new enabling technology to replace some aspects of conventional batch processes. </p>

Room Temperature Alkali Metal Reduction of Carbon Dioxide

2020 ◽  
Author(s):  
Lucas A. Freeman ◽  
Akachukwu D. Obi ◽  
Haleigh R. Machost ◽  
Andrew Molino ◽  
Asa W. Nichols ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Alkali Metals ◽  
Room Temperature ◽  
Chemical Reduction ◽  
Bond Cleavage ◽  
Open Shell ◽  
Metal Reduction ◽  
One Pot ◽  
Earth Abundant ◽  
Electron Reduction

The reduction of the relatively inert carbon–oxygen bonds of CO<sub>2</sub> to access useful CO<sub>2</sub>-derived organic products is one of the most important fundamental challenges in synthetic chemistry. Facilitating this bond-cleavage using earth-abundant, non-toxic main group elements (MGEs) is especially arduous because of the difficulty in achieving strong inner-sphere interactions between CO<sub>2</sub> and the MGE. Herein we report the first successful chemical reduction of CO<sub>2</sub> at room temperature by alkali metals, promoted by a cyclic(alkyl)(amino) carbene (CAAC). One-electron reduction of CAAC-CO<sub>2</sub> adduct (<b>1</b>) with lithium, sodium or potassium metal yields stable monoanionic radicals clusters [M(CAAC–CO<sub>2</sub>)]<sub>n</sub>(M = Li, Na, K, <b> 2</b>-<b>4</b>) and two-electron alkali metal reduction affords open-shell, dianionic clusters of the general formula [M<sub>2</sub>(CAAC–CO<sub>2</sub>)]<sub>n </sub>(<b>5</b>-<b>8</b>). It is notable that these crystalline clusters of reduced CO<sub>2</sub> may also be isolated via the “one-pot” reaction of free CO<sub>2</sub> with free CAAC followed by the addition of alkali metals – a reductive process which does not occur in the absence of carbene. Each of the products <b>2</b>-<b>8</b> were investigated using a combination of experimental and theoretical methods.<br>

A Series of Metal-Organic Frameworks for Selective CO2 Capture and Catalytic Oxidative Carboxylation of Olefins

2018 ◽  
Author(s):  
Huong T. D. Nguyen ◽  
Y B. N. Tran ◽  
Hung N. Nguyen ◽  
Tranh C. Nguyen ◽  
Felipe Gándara ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Adsorption ◽  
New Materials ◽  
One Pot ◽  
Acid Gas ◽  
Naphthalene Diimide ◽  
Styrene Carbonate ◽  
Metal Organic ◽  
Adsorption Of Co ◽  
The One

<p>Three novel lanthanide metal˗organic frameworks (Ln-MOFs), namely MOF-590, -591, and -592 were constructed from a naphthalene diimide tetracarboxylic acid. Gas adsorption measurements of MOF-591 and -592 revealed good adsorption of CO<sub>2</sub> (low pressure, at room temperature) and moderate CO<sub>2</sub> selectivity over N<sub>2</sub> and CH<sub>4</sub>. Accordingly, breakthrough measurements were performed on a representative MOF-592, in which the separation of CO<sub>2</sub> from binary mixture containing N<sub>2</sub> and CO<sub>2</sub> was demonstrated without any loss in performance over three consecutive cycles. Moreover, MOF-590, MOF-591, and MOF-592 exhibited catalytic activity in the one-pot synthesis of styrene carbonate from styrene and CO<sub>2</sub> under mild conditions (1 atm CO<sub>2</sub>, 80 °C, and solvent-free). Among the new materials, MOF-590 revealed a remarkable efficiency with exceptional conversion (96%), selectivity (95%), and yield (91%). </p><br>

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