Following the synthesis and characterization of meso-tetramethyl tetrakis (4-phenoxy acetone) calix[4]pyrrole, 1, the solution properties of this receptor in various solvents were investigated. Particular emphasis is placed on the selection of the solvent in assessing thermodynamic selectivity in ion complexation studies involving calixpyrrole receptors. Thus, statements recently made in the literature are addressed.The interaction of 1 with anions and cations was assessed through (1)H NMR in CD(3)CN at 298 K. Among anions, significant chemical shift changes were observed in the pyrrolic protons by the addition of halide salts to 1 in the deuterated solvent. The sequence observed in the Deltadelta values is that observed in the transfer Gibbs energies of these anions from a dipolar aprotic (acetonitrile) to a protic medium (representative of 1) based on the Ph(4)AsPh(4)B convention. As far as metal cations in CD(3)CN are concerned, the most significant changes are observed (relative to those of the ligand) in the protons of the phenoxy acetone functionality upon the addition of the mercury(ii) salt to 1. Conductance measurements reveal the formation of 1 : 1 complexes with these ions. Thermodynamic data derived from titration calorimetry are reported and compared with available data for analogous ligands. A quantitative evaluation of the thermodynamic stability was carried out. The applications of these ligands as anchor groups in oligomeric frameworks are discussed. Final conclusions are given.
This research output has an Altmetric Attention Score of 5. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 10 September 2014.
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Altmetric has tracked 34,447,360 research outputs across all sources so far. This one has received more attention than most of these and is in the 70th percentile.
So far Altmetric has tracked 21,068 research outputs from this source. They receive a mean Attention Score of 2.8. This one has done well, scoring higher than 84% of its peers.
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