Viewed 1k times. Wikipedia: Di-tert-butyl ether B b. Improve this question. Take the tour to get familiar with this site. If you receive useful answers, consider accepting one. The teacher refer to a kind of compactness and if you let me say so "sphericity". This reduces surface forces but has a positive effect on paking. Most important is the conformational spread of the linear chain.
They bring an entropic term that favours melting and solubility. In other words in your solid there is potential for the molecule to be not only in the long confirmation sketched.
Even if they adopted it, to get there they have already got energy at the expense of the wdw forces. You can't really compare it like that. True, one would expect higher melting point in a molecule having central symmetry, but your molecules don't have it, and other kinds of symmetry are less relevant.
As for the number of conformers, it hardly matters much, since the crystal is typically built of only one conformer. I can at least kind of grasp the intuition behind it now. Show 2 more comments. Active Oldest Votes. Improve this answer. Alchimista Alchimista 3, 2 2 gold badges 7 7 silver badges 16 16 bronze badges.
Add a comment. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Sheldrick, , All esds except the esd in the dihedral angle between two l. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate isotropic treatment of cell esds is used for estimating esds involving l.
Refinement of F 2 against ALL reflections. R-factors based on F 2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. Issue contents. Thermodynamic curvature and the thermal expansion isolines. Macromolecular Chemistry and Physics , 5 , Macromolecular Rapid Communications , 42 6 , Peculiar effect of acylamino and cyan groups on thermal behavior of 2- 1-cyanomethylethyl azocarboxamide.
Journal of Loss Prevention in the Process Industries , 69 , Chemistry — A European Journal , 27 8 , The effects of the position of the ether oxygen atom in pyrrolidinium-based room temperature ionic liquids on their physicochemical properties. Physical Chemistry Chemical Physics , 22 35 , Exploration of low-melting energetic compounds: influence of substituents on melting points. New Journal of Chemistry , 44 32 , Wilkins , Lissinda H.
Characterization of solid lipid dispersions prepared by hot fusion containing a double-fixed dose combination of artemether and lumefantrine. Drug Development and Industrial Pharmacy , 46 8 , Melting points of alkali chlorides evaluated for a polarizable and non-polarizable model.
The Journal of Chemical Physics , 1 , Molecules , 25 5 , Reliable prediction of the flash point of organic compounds containing hazardous peroxide functional groups as compared to the best available methods. Process Safety and Environmental Protection , , Aniruddha Ram , Krishna Venkatesh , K.
Gopalakrishna , K. Kashyap , K. Fuel , , Ghareeb , Mayyas Al-Remawi. Therapeutic deep eutectic system of capric acid and menthol: Characterization and pharmaceutical application. Journal of Drug Delivery Science and Technology , 53 , Yeong , Suresh S.
The anomalous behaviour of aliphatic fatty diamides: Chain length and hydrogen bonding interactions. Solar Energy Materials and Solar Cells , , Phase behavior of monosulfones: Use of high polarity sulfonyl groups to improve the thermal properties of lipid-based materials for PCM applications.
CrystEngComm , 21 27 , Molecules , 24 12 , Ester , Vance E. Molecular symmetry effects on the stability of highly ordered smectic phases. Liquid Crystals , 46 1 , Polymer Bulletin , 75 10 , Thermal investigations of biologically important fused azaisocytosine-containing congeners and the crystal structure of one representative. Journal of Analytical and Applied Pyrolysis , , Melting point, molecular symmetry and aggregation of tetrachlorobenzene isomers: the role of halogen bonding.
Synthesis of novel perfluoroalkyl ether derivatives. Research on Chemical Intermediates , 44 9 , Molecular structure and melting: implications for phase change materials. Canadian Journal of Chemistry , 96 7 , Effects of hydrogen bond on the melting point of azole explosives.
Journal of Molecular Structure , , Yalkowsky , Doaa Alantary. Estimation of Melting Points of Organics. Journal of Pharmaceutical Sciences , 5 , Investigation of sulfide capacity of aluminosilicate slag based on ionic structure considerations. Journal of the American Ceramic Society , 2 , The impact of molecular symmetry and shape on the stability of discotic liquid crystals. Canadian Journal of Chemistry , 96 2 , Thermal behaviour of antiproliferative active 3- 2-furanyl aryl-7,8-dihydroimidazo[2,1-c][1,2,4]triazin-4 6H -ones.
Journal of Thermal Analysis and Calorimetry , 3 , Synthesis and Characterization of Bromoaluminate Ionic Liquids. Chemistry - A European Journal , 23 41 , Unsymmetry effect of hexa- peri -hexabenzocoronenes on columnar mesophase behaviour.
Liquid Crystals , 44 8 , Structural systematics and conformational analyses of an isomer grid of nine tolyl-N-pyridinylcarbamates. Structural Chemistry , 28 3 , Spencer S. ChemistrySelect , 2 5 , Group Theory. Properties of Inorganic Compounds.
An insight into the thermal behaviour of biologically active 8-aryloxo-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazinecarbohydrazides. Reliable method for safety assessment of melting points of energetic compounds. Chemistry - An Asian Journal , 11 15 , Increase of both solubility and working voltage by acetyl substitution on ferrocene for non-aqueous flow battery. Electrochemistry Communications , 69 ,
0コメント