Preferred Label : cryptand;
IUPAC definition : A molecular entity comprising a cyclic or polycyclic assembly of binding sites that
contains three or more binding sites held together by covalent bonds, and which defines
a molecular cavity in such a way as to bind (and thus 'hide' in the cavity) another
molecular entity, the guest (a cation, an anion or a neutral species), more strongly
than do the separate parts of the assembly (at the same total concentration of binding
sites). The adduct thus formed is called a 'cryptate'. The term is usually restricted
to bicyclic or oligocyclic molecular entities. Example: Corresponding monocyclic
ligand assemblies crowns are sometimes included in this group, if they can be considered
to define a cavity in which a guest can hide. The terms 'podand' and 'spherand' are
used for certain specific ligand assemblies. Coplanar cyclic polydentate ligands,
such as porphyrins, are not normally regarded as cryptands.;
Origin ID : C01426;
Automatic exact mappings (from CISMeF team)
- See also
A molecular entity comprising a cyclic or polycyclic assembly of binding sites that
contains three or more binding sites held together by covalent bonds, and which defines
a molecular cavity in such a way as to bind (and thus 'hide' in the cavity) another
molecular entity, the guest (a cation, an anion or a neutral species), more strongly
than do the separate parts of the assembly (at the same total concentration of binding
sites). The adduct thus formed is called a 'cryptate'. The term is usually restricted
to bicyclic or oligocyclic molecular entities. Example: Corresponding monocyclic
ligand assemblies crowns are sometimes included in this group, if they can be considered
to define a cavity in which a guest can hide. The terms 'podand' and 'spherand' are
used for certain specific ligand assemblies. Coplanar cyclic polydentate ligands,
such as porphyrins, are not normally regarded as cryptands.
