2012
DOI: 10.1039/c1cs15170c
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Recent advances with π-conjugated salen systems

Abstract: Schiff base ligands have long been successfully employed as ligands in combination with various metals to give catalysts capable of realizing a variety of synthetic transformations. One of the most widely used Schiff base ligands, the "salen" ligand, has been extensively researched. Recently, there has been increased interest in π-conjugated salen systems, known as "salphen" ligands, as a result of the differences in reactivity of the complexes in catalytic applications compared with the salen analogues. Compl… Show more

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Cited by 235 publications
(131 citation statements)
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“…5 Metal-salen based complexes (see 1a) are among the most fascinating metallo-organic systems because their chemical versatility and flexibility. 6 Their almost flat structure is particularly adapted to enhance molecule/substrate interactions. A variety of metal ions (dia-and paramagnetic) can be introduced in the coordination pocket leaving the overall molecular structure unperturbed, and numerous substituents can be placed on the phenol rings and the diamine bridge allowing the control of their self-assembly on surfaces.…”
mentioning
confidence: 99%
“…5 Metal-salen based complexes (see 1a) are among the most fascinating metallo-organic systems because their chemical versatility and flexibility. 6 Their almost flat structure is particularly adapted to enhance molecule/substrate interactions. A variety of metal ions (dia-and paramagnetic) can be introduced in the coordination pocket leaving the overall molecular structure unperturbed, and numerous substituents can be placed on the phenol rings and the diamine bridge allowing the control of their self-assembly on surfaces.…”
mentioning
confidence: 99%
“…Various useful and interesting salen-type complexes have been synthesized and characterized until now [48], and detailed electronic structural studies have recently been reported for a dinuclear chelating salen-type ligand having a catechol and a tetra(amino)tri(hydroxy)phenyl moiety [49,50]. In view of the interest in the redox properties of metal-phenolate complexes, detailed electronic structures of the one-electron oxidized complexes are discussed in order to understand the electronic structure difference between the metal-centered and ligand-centered oxidation products and its dependence on the properties of metal ions and substituents of the phenolate moiety.…”
Section: Scheme 1 Proposed Mechanism Of Galactose Oxidase (Go)mentioning
confidence: 99%
“…Symmetrical Schiff bases derived from 2:1 condensation of β-diketone or salicylaldehyde derivatives with a 1,2-diamine moiety represent, not only some of the earliest examples of tetradentate ligand types but also some of the most studied [1][2][3][4]. Indeed such species have been known since Alfred Werner's time.…”
Section: Introductionmentioning
confidence: 99%
“…[1] Ligands of this type typically lose two protons and coordinate in a square-planar manner to form neutral metal complexes with a number of divalent metal ions. Individual complexes have been investigated for a number of applications, including as oxygen carriers [5], non-linear optical materials [6], as catalysts (and especially asymmetric catalysts) [2,7], in inorganic biochemical roles [8] and as components of metallosupramolecular systems [2,9]. In contrast to symmetrical Schiff base systems, unsymmetric systems have received significantly less attention, in part reflecting that their syntheses are usually [6,10,11] (but not always) [12] somewhat less facile than for related symmetrical systems.…”
Section: Introductionmentioning
confidence: 99%