spherandn.
/ˈsfɛrand//ˈsfɪərand/ Chemistry.
Any of a class of organic ligands with molecules in the form of a hollow sphere, which bind selectively cations of alkali metals and are more stable than cryptands.
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spherand1979
1979 D. J. Cram et al. in Jrnl. Amer. Chem. Soc. 101 6753/1 We suggest the class name ‘spherands’ for such ligand systems, and the class name ‘metallospherium’ salts for their complexes with metal salts.
1987 Sci. Amer. Dec. 23/3 Another type of host, called a spherand,..is still stabler.
1988 P. D. Beer in T. E. Edmonds Chem. Sensors ii. 42 Whereas the crown ethers and,..the cryptands, reorganize in order to bind a cationic metal ion guest, the spherands and the host parts of their complexes are conformationally the same.
1988 Nature 7 July 10/1 Lehn's cryptands, Cram's spherands and their derivatives, all organic ‘host’ compounds that bind to smaller ‘guests’, exemplify this field of designer chemistry.
This entry has not yet been fully updated (first published 1993; most recently modified version published online June 2018).
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n.1979