Dye-sensitized photopolymerization. I. Photopolymerization of ethyl acrylate by sodium fluorescein-ascorbic acid system in aqueous solution

1981 ◽  
Vol 19 (11) ◽  
pp. 2671-2679 ◽  
Author(s):  
Subasini Lenka ◽  
Padma L. Nayak ◽  
Munmaya K. Mishra
Keyword(s):  
Aqueous Solution ◽  
Ascorbic Acid ◽  
Ethyl Acrylate ◽  
Sodium Fluorescein ◽  
Acid System ◽  
Dye Sensitized

scholarly journals Harnessing Chemical Energy for the Activation and Joining of Prebiotic Building Blocks

2019 ◽  
Author(s):  
Ziwei Liu ◽  
Long-Fei Wu ◽  
Jianfeng Xu ◽  
Claudia Bonfio ◽  
David Russell ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acid ◽  
Peptide Nucleic Acid ◽  
Reactive Intermediates ◽  
Building Blocks ◽  
Acid System ◽  
Rna Oligomers ◽  
Prebiotic Activation ◽  
Simultaneous Activation ◽  
Acid Anhydrides

Simultaneous activation of carboxylates and phosphates provides multiple pathways for the generation of reactive intermediates, including mixed carboxylic acid-phosphoric acid anhydrides, for the synthesis of peptidyl-RNAs, peptides, RNA oligomers and primordial phospholipids. These results indicate that unified prebiotic activation chemistry could have enabled the joining of building blocks in aqueous solution from a common pool and enabled the progression of a system towards higher complexity foreshadowing the modern encapsulated peptide-nucleic acid system

scholarly journals Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomobybdate complex

2003 ◽  
Vol 68 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Randjel Mihajlovic ◽  
Natasa Ignjatovic ◽  
Marija Todorovic ◽  
Ivanka Holclajtner-Antunovic ◽  
Vesna Kaljevic
Keyword(s):  
Aqueous Solution ◽  
Ascorbic Acid ◽  
Acid Medium ◽  
Spectrophotometric Method ◽  
Methyl Ketone ◽  
Coal Ash ◽  
Molar Absorptivity ◽  
Stable Complex ◽  
Tolerance Limits

A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue ("molibdenum blue") by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66x104 dm3 mol-1cm-1 at 720 nm and 2.10x104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (?2 %). Beer?s law is obeyed in the for concentration range to 0.6 ?g/mL (aqueous solution) and to 1.2 ?g/mL P (MIBK). The sensitivity of the proposed method is 0.0078 ?g/mL (aqueous solution) and 0.0066 ?g/mL (MIBK).

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