Molecular polarisability. The conformations of diphenyl ketone, dimesityl ketone, and mesityl phenyl ketone as solutes

1967 ◽  
Vol 0 (0) ◽  
pp. 741-743 ◽  
Author(s):  
P. H. Gore ◽  
J. A. Hoskins ◽  
R. J. W. Le Fèvre ◽  
L. Radom ◽  
G. L. D. Ritchie
Keyword(s):  
Phenyl Ketone

scholarly journals 1-Isoquinolinyl phenyl ketone as a corrosion inhibitor: A theoretical study

2021 ◽  
Author(s):  
Ennas Abdul Hussein ◽  
Dunya Y. Fanfoon ◽  
Raheem A.H. Al-Uqaily ◽  
Ali M. Salman ◽  
Mustafa M. Kadhim ◽  
...  
Keyword(s):  
Corrosion Inhibitor ◽  
Theoretical Study ◽  
Phenyl Ketone

A Comparison of Soxhlet Extraction and Ultrasonic-Assisted Extraction for Analysis of Photoinitiators in Printed Cartonboard Food-Packaging Materials

2012 ◽  
Vol 262 ◽  
pp. 561-566
Author(s):  
Chao Ding ◽  
Fang Wang ◽  
Mei Xia Pang ◽  
Xin Xin Yi ◽  
Feng Tan ◽  
...  
Keyword(s):  
Food Packaging ◽  
Soxhlet Extraction ◽  
Gas Chromatography Mass Spectrometry ◽  
Packaging Materials ◽  
Selected Ion Monitoring ◽  
Food Packaging Materials ◽  
Assisted Extraction ◽  
Relative Standard ◽  
Ultrasonic Assisted ◽  
Phenyl Ketone

A new method was established for detecting a series of photoinitiators (PIs) in printed cartonboard food-packaging materials, which were benzophenone (BP), 4-methylbenzophenone (MBP), 1-hydroxycyclohexyl phenyl ketone (Irgacure184), ethyl-4-dimethylaminobenzoate (EDAB), 2-ethylhexyl-4-dimethylaminobenzoate (EHDAB) and 2-isopropylthioxanthone (ITX) by gas chromatography–mass spectrometry (GC/MS). Extraction was carried out with ethyl acetate by ultrasonic solvent extraction. Samples were analyzed by GC/MS in selected ion monitoring (SIM) mode. The results indicated that six kinds of PIs had good linear relations (R2>0.9989) in the range of 10~200 μg/L. Limit of Detections (LODs) and Limit of Quantifications ( LOQs ) of all kinds of PIs were 0.3~2.6 μg /kg and 1~8 μg/kg, respectively. The recoveries of six kinds of PIs at three kinds of concentrations researched (0.30 μg/kg, 0.60 μg/ kg, 1.0 μg/kg) were ranging from 66.7%~89.4%, with the Relative Standard Deviation (RSD) of 4.2%~10.6% (n=6). The results also suggested that PIs were detected in food packaging materials.

scholarly journals Inter-enantiomer conversion dynamics and Johari–Goldstein relaxation of benzophenones

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Michela Romanini ◽  
Roberto Macovez ◽  
Maria Barrio ◽  
Josep Lluís Tamarit
Keyword(s):  
Glass Transition ◽  
Dielectric Loss ◽  
Dielectric Spectroscopy ◽  
Parent Compound ◽  
Scanning Calorimetry ◽  
Molecular Conformations ◽  
Molecular Glass ◽  
Phenyl Ketone ◽  
Temperature And Pressure ◽  
Opposite Chirality

AbstractWe employ temperature- and pressure-dependent dielectric spectroscopy, as well as differential scanning calorimetry, to characterize benzophenone and the singly-substituted ortho-bromobenzophenone derivative in the liquid and glass states, and analyze the results in terms of the molecular conformations reported for these molecules. Despite the significantly higher mass of the brominated derivative, its dynamic and calorimetric glass transition temperatures are only ten degrees higher than those of benzophenone. The kinetic fragility index of the halogenated molecule is lower than that of the parent compound, and is found to decrease with increasing pressure. By a detailed analysis of the dielectric loss spectra, we provide evidence for the existence of a Johari–Goldstein (JG) relaxation in both compounds, thus settling the controversy concerning the possible lack of a JG process in benzophenone and confirming the universality of this dielectric loss feature in molecular glass-formers. Both compounds also display an intramolecular relaxation, whose characteristic timescale appears to be correlated with that of the cooperative structural relaxation associated with the glass transition. The limited molecular flexibility of ortho-bromobenzophenone allows identifying the intramolecular relaxation as the inter-enantiomeric conversion between two isoenergetic conformers of opposite chirality, which only differ in the sign of the angle between the brominated aryl ring and the coplanar phenyl-ketone subunit. The observation by dielectric spectroscopy of a similar relaxation also in liquid benzophenone indicates that the inter-enantiomer conversion between the two isoenergetic helicoidal ground-state conformers of opposite chirality occurs via a transition state characterized by a coplanar phenyl-ketone moiety.

IR laser ablative and conventional decomposition of poly(vinyl phenyl ketone): Different processes and different products

2007 ◽  
Vol 92 (3) ◽  
pp. 352-358 ◽  
Author(s):  
Dana Pokorná ◽  
Jan Šubrt ◽  
Anna Galíková ◽  
Josef Pola
Keyword(s):  
Ir Laser ◽  
Phenyl Ketone

Embryotoxicity of phenyl ketone analogs of cyclophosphamide

Teratology ◽  
1989 ◽  
Vol 39 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Barbara F. Hales ◽  
Susan M. Ludeman ◽  
Victoria L. Boyd
Keyword(s):  
Phenyl Ketone
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