Bilayer membranes are formed spontaneously by regular, cooperative, two-dimensional assemblage of component amphiphiles. The regular, coordinative molecular arrangements in bilayer are capable of complexing with guests specifically. In contrast to the general host-guest compounds such as crown ethers-M+ having convergent binding vectors, the bilayer-guest complexes have parallel or divergent binding vectors with regularity Bilayer itself is considered to be a new type of host compound. The concept of host-guest chemistry in bilayer system is on the basis of regularity of binding vectors. For the new concept to generalize, one must develop the investigations based on the characteristics of bilayer membrane.
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