title: Supramolecular adsorption of alkaloids by metallosalphen complexes.
abstract: Mono and bis-zinc(II)-centered salphen derivatives 1-5 are presented as efficient adsorption materials for pyridine-based alkaloid derivatives. The different alkaloid assemblies were studied by UV-vis and NMR spectroscopy, and high binding constants (Ks approximately 10(5)) were additionally determined for the supramolecular complexes based on nicotine. X-ray analyses furthermore revealed, together with spectroscopic solution data, a preferential positioning of the nicotine guest(s). Upon binding to bis-Zn(II)-bis-salphen complexes, the dinicotine assembly provokes a colorimetric change that may be useful for colorimetric analyses. The adsorption/desorption process of nicotine was studied using a polymeric bis-Zn(salphen) complex (5) and showed a recycling potential of this type of complexes in the binding of alkaloid compounds.
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Spain.
authors.forename: Eduardo C
authors.initials: EC
authors.lastname: Escudero-Adán
authors.forename: Jordi
authors.initials: J
authors.lastname: Benet-Buchholz
authors.forename: Arjan W
authors.initials: AW
authors.lastname: Kleij
mesh_terms: D000327:Adsorption; D000470:Alkaloids / Q000737:chemistry*; D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D008670:Metals / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D017186:Titrimetry
chemical_list: D000470:Alkaloids; D008670:Metals; D009942:Organometallic Compounds