منابع مشابه
Chiral Single Crystal Surface Chemistry
Several experiments have been performed to probe the enantiospecific properties of chiral single crystal surfaces. The surfaces chosen have been the (643) planes of Ag and Cu, both face centered cubic structures. The chirality of these surfaces arises from the handedness of their kinked step structures. These structures are such that the (643) and the (643) surfaces are related by mirror symmet...
متن کاملChiral and Achiral Crystal Structures
An extensive study and analysis of the concepts, classification, presentation, and nomenclature of chirality and lack of chirality in crystal structures and their constituents is presented. Oriented crystal structures are classified. The chirality rules for existence of molecular crystal structures are examined and the relation to segmentation and latent symmetry highlighted. The nomenclature o...
متن کاملChiral Crystal Growth under Grinding
To study the establishment of homochirality observed in the crystal growth experiment of chiral molecules from a solution under grinding, we extend the lattice gas model of crystal growth as follows. A lattice site can be occupied by a chiral molecule in R or S form, or can be empty. Molecules form homoclusters by nearest neighbor bonds. They change their chirality if they are isolated monomers...
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that produces opioid-like effects on the central nervous system.1 Cleavage of the β-endorphin C-terminal in the brain and pituitary gland yields the biologically active dipeptide glycyl-Lglutamine (Gly-L-Gln, β-endorphin 30-31), which inhibits βendorphin-induced cardiorespiratory depression.2,3 The stereospecificity of this effect is evident, since Gly-D-Gln has recently been reported to be ina...
متن کاملReversible Single-Crystal-to-Single-Crystal Phase Transition of Chiral Salicylidenephenylethylamine
The chiral crystal of enantiomeric (S)-N-3,5-di-tert-butylsalicylidene-1-phenylethylamine in the enol form [enol-(S)-1] undergoes a reversible single-crystal-to-single-crystal (SCSC) phase transition at Tc ≈ 3 ◦C from the room temperature α-form in orthorhombic space group P212121 (Z′ = 1) to the low temperature β-form in the monoclinic space group P21 (Z′ = 2) with a thermal hysteresis of appr...
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ژورنال
عنوان ژورنال: Science Bulletin
سال: 2017
ISSN: 2095-9273
DOI: 10.1016/j.scib.2017.11.008