Supramolecular, photophysical and catalytic properties of zn(salphen) based complexes and materials
“Salen” ligands are relatively planartetradentate, N2O2-coordinating ligand systems which are obtained by the condensation reaction of readily available diamine and (substituted) salicylaldehyde precursors. Metallosalen complexes combine a number of advantages such as ease of variation in steric and...
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| Format: | doctoral thesis |
| Status: | Published version |
| Publication Date: | 2013 |
| Country: | España |
| Institution: | Universitat Rovira i virgili (URV) |
| Repository: | Repositori Institucional de la Universitat Rovira i Virgili |
| OAI Identifier: | oai:urv.cat:TDX:1259 |
| Online Access: | https://hdl.handle.net/20.500.11797/TDX1259 http://hdl.handle.net/10803/126530 |
| Access Level: | Open access |
| Keyword: | 546 - Química inorgànica 544 - Química física |
| Summary: | “Salen” ligands are relatively planartetradentate, N2O2-coordinating ligand systems which are obtained by the condensation reaction of readily available diamine and (substituted) salicylaldehyde precursors. Metallosalen complexes combine a number of advantages such as ease of variation in steric and electronic features, and the use of modular strategies that enable manipulation of different fragments of the ligand systems. Metal-derived salen complexes are versatile and they have proven to be effective catalysts for many asymmetric conversions including (ep)oxidations, epoxide ring-opening reactions and stereo-selective polymerizations. Lately, phenyl-bridged salen ligands (designated as “salphens” or “salophens”, Scheme 1) and related structures have started to raise the attention of the scientific community due to their particular advantages over their salen analogues; they represent π-conjugated ligand systems with tuneable photophysical properties, and are more cost-effective than the corresponding (chiral) salen ligands. For these reasons, such salphen systems have excellent potential as building blocks in material science amongst other applications. Scheme 1.Schematic drawing of a salphen ligand showing the N2O2 metal binding pocket and the various possibilities for substitution thereof.It should also be noted that the rigid geometry around the metal centre, dictated by the salphen ligand, can be used to manipulate properties such as the Lewis acid character of the metal and therefore it can be effectively applied to increase the reactivity, substrate binding properties and self-assembly behaviour of the resulting complex. Thus, the work reported in this thesis has principally focused on the study of novel self-assembly features and patterns, and on the developmen |
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