Syntheses, characterization and biological studies of zinc(II), copper(II) and cobalt(II) complexes with Schiff base ligand derived from 2‐hydroxy‐1‐naphthaldehyde and selenomethionine

Ran, Xueguang; Wang, Lingyun; Lin, Yingcai; Hao, Jie; Cao, Derong

doi:10.1002/aoc.1678

Cited by 53 publications

(27 citation statements)

References 32 publications

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“…In the UV-Vis spectrum of H 2 napala, two absorption bands at about 310 nm and between 385 and 445 nm arise from the phenol-imine and keto-amine forms, which may be attributed to n-π* and π-π* type transitions, respectively. 25 The ligand complexation gives a clear blueshift of the π-π* transition bands between 385 and 445 nm. This shift indicates that complex 1 only exists in the phenol-imine form and chelates Co II ions with imine N and alkoxide O, as confirmed by the X-ray structural analysis.…”

Section: Optical Propertiesmentioning

confidence: 99%

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Rational design of two bpy-bridged 3D and 2D CoII open frameworks with similar amino-acid-based Schiff bases

Zhou

et al. 2012

Dalton Trans.

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Two novel bpy-bridged Co(II) Schiff base complexes have been synthesized by the hydro(solvo)thermal reactions of corresponding amino-acid-based Schiff bases, bpy and Co(NO(3))(2)·6H(2)O. The following formulae identify the two complexes: {[Co(napala)(bpy)(0.5)]·H(2)O}(n) (1) and [Co(napgly)(bpy)(0.5)](n) (2) [H(2)napala = N-(2-hydroxy-1-naphthylmethylidene)-D/L-alanine, H(2)napgly = N-(2-hydroxy-1-naphthylmethylidene)-glycine and bpy = 4,4'-bipyridine]. These two compounds have been characterized using single-crystal X-ray diffraction, infrared, powder X-ray diffraction, thermogravimetric analysis, optical spectra analysis, and magnetic measurement. Complex 1 features an unprecedented threefold interpenetrated diamond network based on the fan-shaped Co(II)(4)(μ(2)-napala)(4) molecular square node and bpy linker, which represents the first example of 3D framework among the amino-acid-based Schiff base complexes with salicylaldehyde or its derivatives. In 2, adjacent Co(II) ions are bridged by μ(2)-napgly(2-) to form left- and right-handed [Co(II)(μ(2)-napgly)](n) helical chains. These two types of helical chains are sustained alternately by a symmetrical bpy co-ligand into a 2D grid-based layer. The solid-state fluorescence of complexes 1 and 2 are quenched almost completely compared with free mixed-ligands at room temperature. Moreover, magnetic studies show the dominant antiferromagnetic coupling between the Co(II) centers mediated by the syn-anti-COO(-)-bridges in both complexes.

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Section: Optical Propertiesmentioning

confidence: 99%

“…26 However, no obvious bands associated with the d-d transitions were detected in the electronic spectra of complexes 1 and 2, perhaps because of the charge transfer intensity and intraligand transitions. 25,27 Magnetic properties…”

Section: Optical Propertiesmentioning

confidence: 99%

Rational design of two bpy-bridged 3D and 2D CoII open frameworks with similar amino-acid-based Schiff bases

Zhou

et al. 2012

Dalton Trans.

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“…Depending on the type and oxidation state of the central metal atom and the ligand structure, they can be bidentate, tridentate, tetradentate or polydentate, and depending on the nature of the possible counter ion, transition metal Schiff's base complexes show various coordination modes with varying degree of distortion [4,5]. Among these, the tetradentate Schiff bases with N 2 O 2 coordination sites belong to ligands investigated most often in coordination chemistry [6][7][8]. The transition metal complexes formed from tetradentate Schiff bases exhibit a wide range of biological properties [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structures and antimicrobial activities of nickel(II) and zinc(II) diaminomaleonitrile-based complexes

et al. 2018

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Three Ni(II) and Zn(II) complexes [Ni(L1)], [Ni(L2)], and [Zn(L3)(DMSO)] (L1 = 2,3-bis(2-hydroxybenzylideneimino)-2,3-butenedinitrile, L2 = 2,3-bis(2-hydroxy-3-methoxybenzylideneimino)-2,3-butenedinitrile, L3 = 2,3-bis(2-hydroxy-1-naphthylideneimino)-2,3-butenedinitrile) were obtained in DMSO by one-pot syntheses. The complexes were characterized by physicochemical and spectroscopic methods. Also, their solid-state structures were determined by single-crystal X-ray diffraction. The geometries of the Ni(II) and Zn(II) complexes were square planar and square pyramidal, respectively. The complexes were screened in vitro against a fungal species and eight species of bacteria, revealing their antimicrobial activity.

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“…However, problems of ligand instability for Schiff bases are often encountered [8][9][10][11][12][13]. These problems can be overcome by reduction of the C¼N bond of the Schiff base to give an amine, which is expected to generate much more interesting coordination chemistry due to the flexible backbone of the reduced Schiff base.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we reported syntheses, characterizations, and biological studies of metal complexes with Schiff base derived from aromatic aldehydes and D,L-selenomethionine [8,9]. Instability of the D,L-selenomethionine Schiff base was encountered, which was resolved by making an equimolar metal salt of the Schiff-base ligand.…”

Section: Introductionmentioning

confidence: 99%

Syntheses and characterizations of zinc(II) and copper(II) complexes with reduced Schiff base derived from salicylaldehyde and D,L-selenomethionine

Wang

Ran

Cao

et al. 2011

Journal of Coordination Chemistry

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New zinc(II) and copper(II) complexes with a reduced Schiff-base ligand derived from D,L-selenomethionine and salicylaldehyde have been synthesized and characterized by elemental analysis, magnetic susceptibility, IR, and NMR measurements. The single-crystal X-ray structure of the Cu(II) complex reveals that this complex is a carboxylate-bridged dimer of dinuclear copper(II) subunits and all metal centers are five-coordinate with O 4 N donor sets in distorted square-pyramidal geometries. The Cu(II) complex consists of a 1-D coordination polymer.

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Syntheses, characterization and biological studies of zinc(II), copper(II) and cobalt(II) complexes with Schiff base ligand derived from 2‐hydroxy‐1‐naphthaldehyde and selenomethionine

Abstract: Novel zinc(II), copper(II), and cobalt(II) complexes of the

Cited by 53 publications

References 32 publications

Rational design of two bpy-bridged 3D and 2D CoII open frameworks with similar amino-acid-based Schiff bases

Rational design of two bpy-bridged 3D and 2D CoII open frameworks with similar amino-acid-based Schiff bases

Synthesis, structures and antimicrobial activities of nickel(II) and zinc(II) diaminomaleonitrile-based complexes

Syntheses and characterizations of zinc(II) and copper(II) complexes with reduced Schiff base derived from salicylaldehyde and D,L-selenomethionine

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