Cation‐π Interactions between a Noble Metal and a Polyfunctional Aromatic Ligand: Ag⁺(benzylamine)

Abstract

The structure of an isolated Ag+(benzylamine) complex is investigated by infrared multiple photon dissociation (IRMPD) spectroscopy complemented with quantum chemical calculations of candidate geometries and their vibrational spectra, aiming to ascertain the role of competing cation‐N and cation‐π interactions potentially offered by the polyfunctional ligand. The IRMPD spectrum has been recorded in the 800–1800 cm−1 fingerprint range using the IR free electron laser beamline coupled with an FT‐ICR mass spectrometer at the Centre Laser Infrarouge d'Orsay (CLIO). The resulting IRMPD pattern points toward a chelate coordination (N‐Ag+‐π) involving both the amino nitrogen atom and the aromatic π‐system of the phenyl ring. The gas‐phase reactivity of Ag+(benzylamine) with a neutral molecular ligand (L) possessing either an amino/aza functionality or an aryl group confirms N‐ and π‐binding affinity and suggests an augmented silver coordination in the product adduct ion Ag+(benzylamine)(normalL) .

Recovery of high‐purity‐4‐chloroguaiacol from bleaching wastewater by a heterogeneous extraction method

“…It can be observed that most of the coordination centers were heavy metals leading to the limitation of their application. [36][37][38] Since 2014, Ca 2+ was used as the coordination center to prepare calcium phenolate complexes with guaiacol and its derivatives as ligands. 39 The essence of this method was to use calcium hydroxide solution to react with guaiacol or its derivatives to produce a coordination compound with a molar ratio of calcium to guaiacol of 1:4.…”

“…The reaction system has been extensively used in organic synthesis, 33 food industry 34 and health research, 35 etc . It can be observed that most of the coordination centers were heavy metals leading to the limitation of their application 36‐38 . Since 2014, Ca 2+ was used as the coordination center to prepare calcium phenolate complexes with guaiacol and its derivatives as ligands 39 .…”