2026-04-05T12:50:03Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2283172026-03-24T00:41:50Zcom_2072_1057col_2072_478905col_2072_478917col_2072_478933

urn:hdl:2445/228317 Binding Studies of a Luminescent Pt(II) Organometallic Calix[4]pyrrole with Halide Salts Lázaro Palacios, Ariadna Valencia, Esteban Ballester, Pablo Rodríguez Raurell, Laura Compostos organometàl·lics Compostos d'halògens Química organometàl·lica Organometallic compounds Halogen compounds Organometallic chemistry We report the synthesis of a luminescent Pt(II) complex, PtL2, based on a “two-wall” aryl-extended calix[4]pyrrole (C[4]P). We characterize its binding properties as a receptor of methyl trioctyl ammonium chloride (MTOA·Cl) in a dichloromethane solution. To this end, we performed 1H NMR and UV−vis spectroscopic titrations. The singular luminescent properties of PtL2 allowed the use of highly sensitive emission spectroscopy to</p><p>monitor the binding. The binding affinity of PtL2 for MTOA·Cl is 2-fold smaller than that of the C[4]P precursor. This difference is attributed to dissimilar anion−π interactions and binding geometries in the ion-paired complexes of the two receptors, (Cl⊂PtL2/C[4]P)@MTOA. Isothermal titration calorimetry (ITC) experiments revealed subtle differences in enthalpy and entropy. The entropic term, although negative, was very small, suggesting the relevance of the dissociation/association processes of the salt and the ion-paired complexes. We investigated the binding selectivity of PtL2 toward a series of halides in acetone solution favoring ion-pair dissociation. PtL2 binds chloride selectively and with a high affinity, producing mainly an anionic complex. 2026-03-19T12:56:16Z 2026-03-19T12:56:16Z 2025-02-21 2026-03-19T12:56:17Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1021/acsomega.4c11558 ACS Omega, 2025, vol. 10, p. 8665-8674 https://doi.org/10.1021/acsomega.4c11558 cc-by-nc-nd (c) Lázaro, Adriana, et al., 2026 info:eu-repo/semantics/openAccess American Chemical Society