Search results for "Close-packing of equal spheres"

showing 3 items of 13 documents

London equation of state for a quantum-hard-sphere system

1994

The London analytical interpolation equation between zero and packing densities for the ground-state energy of a many-boson hard-sphere system is corrected for the reduced mass of a pair of particles in a ``sphere-of-influence'' picture. It is thus brought into good agreement with computer simulations and with experimental results extrapolated out to close packing.

PhysicsLondon equationsClassical mechanicsZero (complex analysis)Close-packing of equal spheresState (functional analysis)Reduced massGround stateQuantumInterpolationPhysical Review B
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Properties and interactions – melting point of tri­bromo­benzene isomers

2021

The melting points of tri­bromo­benzene isomers are correlated with the number, nature and distribution of intermolecular interactions in their structures.

chemistry.chemical_classificationHalogen bondtribromobenzene isomersChemistryIntermolecular forcemelting pointMetals and AlloysClose-packing of equal spheresResearch PapersAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsCrystalmolecular symmetryCrystallographynoncovalent interactionsMaterials ChemistryMelting pointMolecular symmetrystructure-property relationshipNon-covalent interactionsMoleculehalogen bondActa Crystallographica Section B-Structural Science Crystal Engineering and Materials
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Packing incentives and a reliable N–H⋯N–pyridine synthon in co-crystallization of bipyridines with two agrochemical actives

2011

The co-crystallization of agrochemical actives thiophanate-methyl and thiophanate-ethyl with 2,2′-bipyridine, 4,4′-bipyridine and 1,2-bis(4-pyridyl)ethane was investigated with conventional crystallization, the slurry method and liquid-assisted grinding. Co-crystals of both thiophanates with all bipyridines were found and the structures solved with single crystal X-ray diffraction. Whereas the 2,2′-bipyridine co-crystals seem to form because of a combination of weak interactions, and in the case of the thiophanate-methyl, partly because of close packing incentives, the 4,4′-bipyridine and 1,2-bis(4-pyridyl)ethane co-crystals form mainly because of a favourable N–H···N–pyridine hydrogen bond…

röntgen diffraktioyhteiskideChemistryHydrogen bondSynthonClose-packing of equal spheressupramolecular synthonGeneral ChemistryCondensed Matter Physicsco-crystalsupramolekyyliX-ray diffractionlaw.inventionGrindingchemistry.chemical_compoundlawPyridineSlurryOrganic chemistryGeneral Materials ScienceCrystallizationcocrystalta116Single crystalCrystEngComm
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