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Title: 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
Author: Sun, Qingqing
Aragay, Gemma
Pinto, Andrea
Aguiló Linares, Elisabet
Rodríguez Raurell, Laura
Ballester, Pablo
Keywords: Pirroles
Química supramolecular
Compostos d'or
Supramolecular chemistry
Gold compounds
Issue Date: 9-Jan-2020
Publisher: Wiley-VCH
Abstract: We report the synthesis of an unprecedent 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 solutions. We describe the results of 1H NMR, UV-vis titrations and isothermal titration calorimetry (ITC) experiments in DCM and acetone solution, aiming at 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.
Note: Versió postprint del document publicat a:
It is part of: Chemistry-A European Journal, 2020, vol. 26, num. 15, p. 3348-3357
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ISSN: 0947-6539
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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