| 释义 |
spherand, n. Chem.|ˈsfɛrænd, ˈsfɪərænd|
[f. sphere n. + -and2, after ligand n.]
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.
1979D. J. Cram et al. in Jrnl. Amer. Chem. Soc. CI. 6753/1 We suggest the class name ‘spherands’ for such ligand systems, and the class name ‘metallospherium’ salts for their complexes with metal salts. 1987Sci. Amer. Dec. 23/3 Another type of host, called a spherand,..is still stabler. 1988P. 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. 1988Nature 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. |