Abstract
The formation and characterization of molecular assemblies resulting from mixing of solutions of tetracationic calix[4]pyrroles and tetraanionic porphyrins in water are reported. The self-assembly of the complementary building blocks was quantitatively studied by UV–vis, 1H NMR, Fluorescence and ESI–MS. Binding constants calculated by absorption spectroscopic titrations were in the range of 103–105 M−1. The results indicate that the cationic thiacalix[4]pyrroles show greater binding affinity towards metal free porphyrins than metalloporphyrins under neutral conditions.
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The authors are thankful to the Department of Science and Technology (DST) for project number SR/S1/OC-54/2003, Council of Scientific and Industrial Research (CSIR) and University of Delhi, New Delhi for financial assistance.
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Garg, B., Bisht, T. & Chauhan, S.M.S. Electrostatic interaction between cationic calix[4]pyrroles and anionic porphyrins in water. J Incl Phenom Macrocycl Chem 67, 241–246 (2010). https://doi.org/10.1007/s10847-009-9697-4
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DOI: https://doi.org/10.1007/s10847-009-9697-4