Tetratopic Cavitand Complex

Our own work described in this chapter has been supported over the years by the following grants PRIN 2001 and PRIN 2003 (MURST-Rome), FIRB-Nanoorganization of Materials with Magnetic and Optical Properties, European Network of Excellence MAGMANET. 

MALDI-TOF matrix assisted laser desorption ionization-time-of-flight mass 

1 Gutsche, C.D. (1989) Calixarenes, Royal Society of Chemistry, Cambridge. 

2 Cram, D.J. and Cram, J.M. (1994) Container Molecules and Their Guests, Royal Society of Chemistry, London. 

12 For the few examples of controlled guest delivery from hemicarceplexes see  

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Scheme 7.12 Self-assembly of tetratopic Pd/Pt complex 52 and the other two possible cyclic structures. In the top views sketched in the scheme each sphere corresponds to two cavitands, one over the other.

Allosteric behavior in a ditopic cavitand receptor has been induced via metal coordination [62]. Addition of Ag+ ions to a solution of a 2,2 -bipyridine-bridged biscavitand 56 switches the molecule from an S-shaped to a C-shaped conformation with the two cavities facing each other. At the same time two bis-cavitand molecules are brought together to give an overall tetratopic complex 57 (Figure 7.24). 

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