The significance of macrocyclic compounds
extends from large number of life composing and naturally occurring complexes with enormous biological functions to vast numbers of synthetically made ones for diverse biological and nonbiological functions .
To mimic the active site, macrocyclic compounds
such as cyclodextrins , crown ether , cyclophanes and calixarenes , each having an inclusion cavity as a basic skeleton of potent artificial monooxygenase, were usually employed.
Zolotov (Ed.) Macrocyclic Compounds
in Analytical Chemistry Wiley-Interscience New York (1985) 63.
Again, since macrocyclic compounds
are well-known for their ability to show the important property of molecular recognition, macrocyclic systems containing the chalcone moiety are expected to generate compounds having interesting biological and material properties [24, 25].
, one important group of organic compounds in host-guest chemistry with excellent applications on structural assembly and molecule/ion recognition, on the other hand, can act as guest components for the composites .
As reported in the literature [29-32], factors affecting stability of the ionic forms of the macrocyclic compounds
, (both cationic and anionic), yielded by proton transfer are electronic factors (or polarization), structural (or steric), and solvation factors.
Porphyrins are tetrapyrrole macrocyclic compounds
playing a transcendental role in nature as one of the principal components of molecules such as (i) chlorophyll, (ii) the heme group in blood and cytochromes and (iii) cyanocobalamin (Vitamin [B.sub.12]) [1-3].