2026-04-17T00:51:39Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/3739572024-12-20T21:50:24Zcom_2072_300912com_2072_4427col_2072_301309

00925njm 22002777a 4500 dc Sun, Qingqing author Aragay, Gemma author Pinto, Andrea author Aguiló, Elisabet author Rodríguez, Laura author Ballester, Pablo author 2020-01-09 We report the synthesis of an unprecedented mono‐gold(I) phosphine complex based on a “two‐wall” aryl‐ethynyl extended calix[4]pyrrole. We describe and compare the binding properties of the parent 10α,20α‐bis‐aryl‐ethynyl calix[4]pyrrole ligand and the prepared organometallic compound as receptors for tetraalkylammonium chloride salts in dichloromethane and acetone. We describe the results of 1H NMR, UV–Vis titrations and isothermal titration calorimetry (ITC) experiments in dichloromethane and acetone, aiming to thermodynamically characterize the formed complexes. The obtained results indicate a noticeable decrease in the binding affinity of the chloride for the mono‐gold(I) receptor 1 compared to the parent ligand 2. The increase in the negative value of the electrostatic surface potential at the center of the aromatic ring of the gold(I) meso‐aryl‐ethynyl substituent serves to explain the observed results and the presence in solution of the chloride complex of 1 as a mixture of two conformers. http://hdl.handle.net/2072/373957 https://doi.org/10.1002/chem.201905160 Influence of the Attachment of a Gold(I) Phosphine Moiety at the Upper Rim of a Calix[4]pyrrole on the Binding of Tetraalkylammonium Chloride Salts