Non-covalent synthesis of calix[4]arene-capped porphyrins in polar solvents via ionic interactions

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Fiammengo, Roberto and Timmerman, Peter and Huskens, Jurriaan and Versluis, Kees and Heck, Albert J.R. and Reinhoudt, David N. (2002) Non-covalent synthesis of calix[4]arene-capped porphyrins in polar solvents via ionic interactions. Tetrahedron, 58 (4). pp. 757-764. ISSN 0040-4020

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Abstract:Non-covalent synthesis of calix[4]arene capped porphyrins can be achieved in polar solvents (up to 45% molar fraction of water) via ionic interaction. Thus tetracationic meso-tetrakis(N-alkylpyridinium-3-yl) porphyrins 1a–d and tetra anionic 25,26,27,28-tetrakis(2-ethoxyethoxy)-calix[4]arene tetrasulfonate 2 self-assemble in an entropy driven process in 1:1 stoichiometry with association constants K1·2 as high as 107 M−1 in methanol. The thermodynamic stability remains high even in the presence of competing salts: 10−2 M Bu4NClO4 (4500 times the concentration of the building blocks) gives a reduction in K1·2 of only 10 times. Ternary complexes 1a·2·L using 1-methylimidazole or pyridine as axial ligands (L) have been obtained with L residing outside the assembly cavity.
Item Type:Article
Copyright:© 2002 Elsevier Science
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/37940
Official URL:http://dx.doi.org/10.1016/S0040-4020(01)01097-3
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