First helical zinc(ii) complex with a salen ligand

Mizukami, Shin; Houjou, Hirohiko; Nagawa, Yoshinobu; Kanesato, Masatoshi

doi:10.1039/b301099f

Cited by 72 publications

(43 citation statements)

References 18 publications

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“…Chemical modifications of the ligand, e.g., introduction of some functional groups or substitution of some parts with appropriate ones often changes molecular structures and properties drastically. For example, introduction of butyl group into the positions adjacent to the hydroxyl groups of Schiff-base leads to a formation of four-coordinated complex [18,19]. However, there have been few reports about the crystal structure of zinc Schiffbase complexes used as electroluminescent materials.…”

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confidence: 99%

Synthesis, structure, optoelectronic properties of novel zinc Schiff-base complexes

et al. 2013

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Two novel zinc Schiff-base complexes, bis-(N-(2-hydroxybenzidene)-p-aminodimethylaniline)zinc(II) (2) and bis-(N-(2-hydroxy-1-naphthidene)-p-aminodimethylaniline)zinc(II) (4) were designed and synthesized. Both the complexes exhibit good solubility in organic solvents and excellent thermal stabilities. A single crystal of 2 was grown and its crystalline structure was determined from X-ray diffraction data. Analysis of the electronic structures of both the zinc complexes calculated by density functional theory reveals a localization of orbital. The UV-Vis absorption and photoluminescence profiles of 4 in thin film are similar to those of 2, but the emission for 4 is red-shifted compared to 2. Three-layered devices with a configuration of ITO/NPB/2/Alq 3 /LiF/Al and ITO/NPB/4/Alq 3 /LiF/Al show a yellow and red emission, respectively. zinc complexes, Schiff-base ligands, electroluminescence Citation:Wang L P, Jiao S B, Zhang W F, et al. Synthesis, structure, optoelectronic properties of novel zinc Schiff-base complexes.

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confidence: 99%

Synthesis, structure, optoelectronic properties of novel zinc Schiff-base complexes

et al. 2013

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“…[17,18] As discussed previously, however, the [Zn(L -)] unit readily assembles spontaneously to give the stable 2:3 complex in excellent yield. The crystalline solid of complex 1 is stable up to 220°C.…”

Section: Spectroscopic Studies and Thermal Analysismentioning

confidence: 91%

A Stable Trinuclear Zinc Cluster Assembled from a Thiazolylazo Dye and Zinc Acetate: Preparation, Structural Characterization and Spectroscopic Studies

et al. 2005

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A thiazolylazo dye, 5-(diethylamino)-2-(2-thiazolylazo)phenol (HL), containing potential tridentate binding sites was synthesized in high yield and well characterized. In solution, the reaction of zinc acetate and the deprotonated ligand, L -, results in the instantaneous formation of the supramolecular trinuclear species [Zn 3 L 2 (OAc) 4 ] (1). UV/Vis and 1 H NMR spectroscopic titration experiments in solution confirmed that the ligand and zinc salt interact spontaneously with each other and produce exclusively the polymetallic complex with the metal-to-ligand ratio of 3:2. The crystal structures of both the ligand and coordination complex are reported in this paper. The aromatic part of HL is planar and, significantly, the

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“…In particular, the 1,2-disubstituted ethylene bridge in the chiral salen unit facilitated the synthesis of dynamic helical structures in which the preferred helicity is rationally predicted from the structure of the organic framework. In addition to the oligo(salamo) helical structures reported in this article, there have already been a number of reports on various kinds of helical structures based on the monomeric [31][32][33][34][35][36][37][38][39][40][41], dimeric [42,43] and polymeric [44][45][46] salen-type ligands, as well as the tris(saloph) triple-helical cages [93,94] and single-helix with different types of donor sets [90,[95][96][97]. It has already been demonstrated that the oligo(salamo) helical complexes show unique physical properties and reactivities [98][99][100][101], and the dynamic helicity control would be useful for switching of the chiroptical properties of the helical structures.…”

Section: Discussionmentioning

confidence: 99%

“…As one of the possible candidates of dynamic helical complexes, we designed metal complexes having a series of acyclic oligo(salen)-type ligands (H 2 salen = N,N'-disalicylideneethylenediamine) ( Figure 5a) [25][26][27][28][29][30], while there are several types of related helical structures based on monomeric [31][32][33][34][35][36][37][38][39][40][41], dimeric [42,43] and polymeric [44][45][46] salen-type ligands. We employed salamo derivatives, the oxime analog of salen, as the constituent of the oligomers (H 2 salamo = 1,2-bis(salicylideneaminooxy)ethane) [47,48].…”

Section: Molecular Designmentioning

confidence: 99%

Dynamic Helicity Control of Oligo(salamo)-Based Metal Helicates

Akine

2018

Inorganics

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Much attention has recently focused on helical structures that can change their helicity in response to external stimuli. The requirements for the invertible helical structures are a dynamic feature and well-defined structures. In this context, helical metal complexes with a labile coordination sphere have a great advantage. There are several types of dynamic helicity controls, including the responsive helicity inversion. In this review article, dynamic helical structures based on oligo(salamo) metal complexes are described as one of the possible designs. The introduction of chiral carboxylate ions into Zn 3 La tetranuclear structures as an additive is effective to control the P/M ratio of the helix. The dynamic helicity inversion can be achieved by chemical modification, such as protonation/deprotonation or desilylation with fluoride ion. When (S)-2-hydroxypropyl groups are introduced into the oligo(salamo) ligand, the helicity of the resultant complexes is sensitively influenced by the metal ions. The replacement of the metal ions based on the affinity trend resulted in a sequential multistep helicity inversion. Chiral salen derivatives are also effective to bias the helicity; by incorporating the gauche/anti transformation of a 1,2-disubstituted ethylene unit, a fully predictable helicity inversion system was achieved, in which the helicity can be controlled by the molecular lengths of the diammonium guests.

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First helical zinc(ii) complex with a salen ligand

Abstract: The structure of a tetra-coordinated zinc(II) complex with a salen ligand was determined for the first time; unexpectedly, the complex was an interesting 2:2 metal-to-ligand complex.

Cited by 72 publications

References 18 publications

Synthesis, structure, optoelectronic properties of novel zinc Schiff-base complexes

Synthesis, structure, optoelectronic properties of novel zinc Schiff-base complexes

A Stable Trinuclear Zinc Cluster Assembled from a Thiazolylazo Dye and Zinc Acetate: Preparation, Structural Characterization and Spectroscopic Studies

Dynamic Helicity Control of Oligo(salamo)-Based Metal Helicates

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