NDLI: Aggregation properties of bis(salicylaldiminato)zinc(II) Schiff-base complexes and their Lewis acidic character

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Consiglio, Giuseppe Di Bella, Santo Failla, Salvatore Finocchiaro, Paolo Oliveri, Ivan Pietro
Description	Author Affiliation: Consiglio G ( Dipartimento di Ingegneria Industriale e Meccanica, Università di Catania, I-95125, Catania, Italy.)
Abstract	The synthesis, characterization, $^{1}H$ NMR , optical absorption and fluorescent properties of a series of amphiphilic Schiff-base bis(salicylaldiminato)zinc(II) complexes are reported. Detailed $^{1}H$ NMR , DOSY NMR , optical absorption and fluorescence spectroscopy studies indicate the existence of aggregate species in solutions of non-coordinating solvents . The degree of aggregation is related to the nature of the bridging diamine . Chloroform solutions of complexes where the bridging diamine contains a naphthalene or the pyridine nucleus are always characterized by the presence of defined dimer aggregates, whereas oligomeric aggregates are likely formed by complexes where the bridging diamine contains a benzene ring . In coordinating solvents or in the presence of coordinating species, a complete deaggregation of the complexes occurs, because of the axial coordination to the $Zn^{II}$ ion, accompanied by considerable changes in the $^{1}H$ NMR and optical absorption spectra . The effect of the alkyl chains length seems to play a minor role in the aggregation properties, as noticed by $^{1}H$ NMR data, optical absorption and fluorescence spectra , which remain almost unaltered on changing the chain length.
ISSN	14779226
Issue Number	2
Volume Number	41
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-01-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Lewis Acids Chemistry Organometallic Compounds Schiff Bases Surface-Active Agents Chemical Synthesis Magnetic Resonance Spectroscopy Molecular Structure Solubility Spectrometry, Fluorescence Spectrophotometry, Ultraviolet Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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