The salicylidenamino chirality rule: a method for the establishment of the absolute configurations of chiral primary amines by circular dichroism

Zeitschrift anorg allge chemie

Wang

et al. 2013

A Salamo‐type ligand 6,6′‐diethoxy‐2,2′‐[1,1′‐(ethylenedioxydinitrilo)dimethylidyne]diphenol (H2L) and its pentacoordinate copper(II) complex [CuL(H2O)] were synthesized and structurally characterized. The molecule of H2L is located in a crystallographic inversion center and adopts E configuration with respect to the C=N bond. In the complex [CuL(H2O)], the CuII atom has a tetragonally elongated square‐pyramidal configuration with donor atoms N2O2 forming a perfect basal plane. And an infinite 2D layer supramolecular structure is formed through intermolecular C1–H1A···O5 and C2–H2A···O3 hydrogen bonding interactions.

Section: Resultsmentioning

confidence: 99%

Syntheses, Crystal Structures, and Properties of a Salamo‐type Tetradentate Chelating Ligand and Its Pentacoordinated Copper(II) Complex

Zeitschrift anorg allge chemie

Wang

et al. 2013

“…These are the characteristic peaks for any Salentype ligands due to p-p* transitions [22,24]. However, there is no absorption around 400 nm, which is usually seen for Salen derivatives in the keto-NH form [23,25].…”

Section: Resultsmentioning

confidence: 99%

Supramolecular cobalt(II) complexes: syntheses, crystal structures and solvent effects

Sun

et al. 2010

Transition Met Chem

Two Co II complexes, namely {[CoL(MeOH)-(l-OAc)] 2 Co}Á2MeCNÁ2MeOH (1) and {[CoL(EtOH)(l-OAc)] 2 -Co}Á3EtOH (2) (H 2 L=3,3 0 -dimethoxy-2,2 0 -[(1,3-propylene) dioxybis(nitrilomethylidyne)]diphenol), have been synthesized and characterized by X-ray crystallography. Both complexes contain octahedral coordination geometries, comprising three Co II atoms, two deprotonated bisoxime L 2-units in which four l-phenoxo oxygen atoms form two [CoL(X)] (X = MeOH or EtOH) units, two acetate ligands coordinated to three Co II centers through Co-O-C-O-Co bridges, and coordinated and non-coordinated solvent. Both complexes exhibit 2D supramolecular networks through different intermolecular hydrogen-bonding interactions.

“…, assigned to π-π* transitions of the benzene ring of salicylaldehyde and the oxime, respectively [49]. Upon coordination of the ligands, the absorption at 323 nm disappears from UV-vis spectra of the Zn(ΙΙ) and Cu(ΙΙ) complexes, indicating that the oxime nitrogen is involved in coordination [50]. The intraligand π-π* transition of the benzene ring of salicylaldehyde is slightly shifted in the corresponding complexes and appears at 284 and 299 nm for the Zn(ΙΙ) complex (281 nm for the Cu(ΙΙ) complex).…”

Section: Spectroscopic Behaviorsmentioning

confidence: 99%

Zinc(II) and copper(II) complexes containing asymmetrical Salamo-type ligands: syntheses, crystal structures, and spectroscopic behaviors

Sun

Journal of Coordination Chemistry

et al. 2013

Zn 4 (L 1 ) 2 (OAc) 2 (CH 3 CH 2 OH) 2 ] and [CuL 2 (H 2 O)] with new asymmetric Salamo-type ligands have been synthesized and characterized. There are two coordination geometries (trigonal bipyramidal and square pyramidal) in the Zn(ΙΙ) complex, and the Cu(II) complex has square-pyramidal geometry. A self-assembling continual zigzag chain is formed by intermolecular hydrogen bonds in the Cu(II) complex. The self-assembling array of the Zn(II) complex is linked by intermolecular C-H⋯O and C-H⋯π interactions. Blue emissions of the Zn(II) and Cu(II) complexes in DMF solution are exhibited by fluorescence.