Search results for "Methylcyclohexane"
showing 10 items of 16 documents
Photophysical behavior of 3-methylquinoline and 3-bromoquinoline
1992
Abstract The phosphorescence emission and excitation spectra and their polarizations have been studied for 3-methylquinoline and 3-bromoquinoline in methylcyclohexane and ethanol glasses at 77 K. From the results obtained in 3-methylquinoline (τp = 1.30 s in ethanol, τp = 1.05 s in methylcyclohexane and the out-of-plane polarization) it is concluded that the emission originates from a triplet state of 3ππ∗ character. In 3-bromoquinoline, the phosphorescence lifetimes (ca. 8 ms in a non-polar solvent and 15 ms in a polar solvent) and the negative degree of polarization indicate an emitting state of ππ∗ character that is strongly coupled to a higher-lying triplet state of the nπ∗ type. The mo…
Phase equilibria in the systems 3-methylpentane + methylcyclohexane, diisopropyl ether + methylcyclohexane and 3-methylpentane + diisopropyl ether + …
2002
Abstract Consistent vapor–liquid equilibria (VLE) at 101.3 kPa has been determined for the ternary system 3-methylpentane+diisopropyl ether (DIPE)+methylcyclohexane and the binary subsystems 3-methylpentane+methylcyclohexane and DIPE+methylcyclohexane in the temperature range from 336 to 374 K. According to the experimental results, the systems exhibit slight positive deviation from ideal behavior and no azeotrope is present. The VLE data have been correlated with the composition using the Wilson, UNIQUAC and NRTL relations. These models allow good prediction of the VLE properties of the ternary system from those of the pertinent binary subsystems.
Vapor−Liquid Equilibria for the Binary Systems tert-Butyl Alcohol + Toluene, + Isooctane, and + Methylcyclohexane at 101.3 kPa
1998
Vapor-liquid equilibria were measured for binary systems of tert-butyl alcohol with toluene, isooctane, and methylcyclohexane at 101.3 kPa using a recirculating still. Experimental values of the vapor pressure of non-oxygenated pure components have been obtained. The accuracy of experimental measurements was ±0.01 K in temperature, ±0.01 kPa in pressure, and ±0.001 in mole fractions. The results are thermodynamically consistent according to the point-to-point consistency test. The data were correlated with five liquid-phase activity coefficients models (Margules, Van Laar, Wilson, NRTL, UNIQUAC).
Phosphorescence emission and polarization of quinoline 3-carbonitrile
1993
Abstract The phosphorescence emission and excitation spectra and their polarization have been studied for quinoline 3-carbonitrile in methylcyclohexane and ethanol glasses at 77 K. From the results obtained in this molecule (τ=1.15 sec in ethanol, τ=1.04 sec in methylcyclohexane and out-of-plane polarization) it is concluded that the emission is orginated from a triplet state of 3 ππ * character. The two major spin-orbit coupling mechanisms through which the ππ * state of quinoline 3-carbonitrile acquires dipole-allowed character via nπ * states are: 1. In ethanol glass: 2. In methylcyclohexane glass:
The oxidation of alkanes with dimethyldioxirane; a new mechanistic insight
1997
Abstract Primary kinetic isotope effects were measured for the oxidation of cyclohexane and methylcyclohexane with DMDO in solution and in the gas phase. These experiments suggest an electrophilic oxygen insertion mechanism for the oxidation of alkanes by DMDO.
Vapor-liquid equilibria for the binary systems of methylcyclohexane with 1-propanol, 2-propanol, 1-butanol, and 2-butanol at 101.3 kPa
1997
Isobaric vapor−liquid equilibrium measurements at 101.3 kPa are reported for the binary systems methylcyclohexane + 1-propanol, + 2-propanol, + 1-butanol, and + 2-butanol. The systems show a strong positive deviation from ideality and present a minimum temperature azeotrope. The activity coefficients were found to be thermodynamically consistent by the methods of Van Ness−Byer−Gibbs and Wisniak. The date were correlated with five liquid-phase activity coefficient models (Margules, Van Laar, Wilson, NRTL, and UNIQUAC). According to the average deviations in temperature and in vapor composition the best model for the systems is NRTL.
CCDC 1979791: Experimental Crystal Structure Determination
2020
Related Article: Elena A. Mikhalyova, Matthias Zeller, Jerry P. Jasinski, Raymond J. Butcher, Luca M. Carrella, Alexander E. Sedykh, Konstantin S. Gavrilenko, Sergey S. Smola, Michael Frasso, Sebastian Calderon Cazorla, Kuluni Perera, Anni Shi, Habib G. Ranjbar, Casey Smith, Alexandru Deac, Youlin Liu, Sean M. McGee, Vladimir P. Dotsenko, Michael U. Kumke, Klaus Müller-Buschbaum, Eva Rentschler, Anthony W. Addison, Vitaly V. Pavlishchuk|2020|Dalton Trans.|49|7774|doi:10.1039/D0DT00600A
CCDC 1451618: Experimental Crystal Structure Determination
2016
Related Article: S. Chelli, K. Troshin, S. Lakhdar, H. Mayr, P. Mayer|2016|Acta Crystallogr.,Sect.E:Cryst.Commun.|72|300|doi:10.1107/S2056989016002085
CCDC 2021077: Experimental Crystal Structure Determination
2020
Related Article: Andrey V. Protchenko, Petra Vasko, M. Ángeles Fuentes, Jamie Hicks, Dragoslav Vidovic, Simon Aldridge|2021|Angew.Chem.,Int.Ed.|60|2064|doi:10.1002/anie.202011839
Influence of theZ/EIsomerism on the Pathway Complexity of a Squaramide‐Based Macrocycle
2020
The rising interest on pathway complexity in supramolecular polymerization has prompted the finding of novel monomer designs able to stabilize kinetically trapped species and generate supramolecular polymorphs. In the present work, the exploitation of the Z/E (geometrical) isomerism of squaramide (SQ) units to produce various self-assembled isoforms and complex supramolecular polymerization pathways in methylcyclohexane/CHCl3 mixtures is reported for the first time. This is achieved by using a new bissquaramidic macrocycle (MSq) that self-assembles into two markedly different thermodynamic aggregates, AggA (discrete cyclic structures) and AggB (fibrillar structures), depending on the solven…