Zn(II) and Co(III) metallosupramolecular assemblies derived from a rigid bis-Schiff base ligand

Liu, E; Zhang, Yuan Zhuo; Tan, Jiawen; Li, Li; Golen, James A.; Rheingold, Arnold L.; Zhang, Guoqi

doi:10.1016/j.poly.2015.07.074

Cited by 16 publications

(3 citation statements)

References 37 publications

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“…6), indicating the formation of a low-spin diamagnetic Co (III) complex upon aerobic oxidation of the Co 2+ ion. [49][50][51][52][53] In particular, resonances of the imine CHvN (8.20 ppm) and aromatic (7.2-7.7 ppm) protons fall within the range of those found in other octahedral Co(III) salen-type complexes, axially coordinated with two Lewis bases. 54,55 Instead, for Ni 2+ a slow and progressive transmetallation is observed within seven days.…”

Section: Transmetalation Studiesmentioning

confidence: 93%

Deaggregation properties and transmetalation studies of a zinc(ii) salen-type Schiff-base complex

et al. 2022

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Section: Transmetalation Studiesmentioning

confidence: 93%

Deaggregation properties and transmetalation studies of a zinc(ii) salen-type Schiff-base complex

et al. 2022

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“…Schiff base-type ligands remain continuingly an important class of organic compartments for metal complexation, owing to their ready availability and facile structural modification [1,2]. In recent years, transition metal complexes of Schiff base ligands have attracted increasing attention from chemists for their widespread applications in molecular recognition, catalysis, and luminescence and magnetic materials [3][4][5][6][7][8][9][10]. Aroyl hydrazones constitute of a versatile type of Schiff base compounds that contain strong electron-donating N,O-chelating site for metal ions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structural characterization of zinc(II) and cobalt(II) complexes based on multidentate hydrazone ligands

Zhang

Liu

et al. 2016

Journal of Molecular Structure

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Two multidentate Schiff base ligands containing a hydrazone unit have been synthesized and investigated for zinc(II) and cobalt(II) coordination chemistry. The reactions of the 4-pyridyl derived hydrazone ligand HL1 with zinc(II) or cobalt(II) salts gave three mononuclear complexes that were structurally characterized by X-ray diffraction analysis. The results revealed that the ligand could adopt different coordination modes when various counter anions were employed. While in the case that zinc dichloride was used as a metal salt a neutral mononuclear mono-ligand complex was formed, the deprotonation of hydrazone occurred when zinc(II) or cobalt(II) nitrate were present and two new isostructural mononuclear bis-ligand complexes were isolated. Modification of the hydrazone ligand with oxygen donors was found to have a significant impact on the ligand reactivity, and a similar reaction of H 2 L2 with cobalt(II) nitrate gave a protonated product of H 2 L2 without the incorporation of cobalt(II), which features a one-dimensional hydrogen-bonded network in the solid state.

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“…By contrast, there are numerous examples of coordination complexes derived from Schiff base molecules with two 2-phenol substituents in each ring, LH 2 . In these instances, the dinegative Schiff base anion N,O-chelates two metal centres such as in binuclear Co 2 (L 1 ) 3 (JUKZOG; Liu et al, 2015), with a fac-N 3 O 3 donor set within an octahedral geometry, and Cu 2 (L 2 ) 3 (PPh 3 ) 2 (VOWBAM; Prakash et al, 2015) with tetrahedral NOP 2 donor sets; for the L 1 dianion, there are 3-ethoxy substituents in each ring and for L 2 , the are 4-chloro substituents.…”

Section: Database Surveymentioning

confidence: 99%

Crystal structure, Hirshfeld surface analysis and computational study of bis(2-{[(2,6-dichlorobenzylidene)hydrazinylidene]methyl}phenolato)cobalt(II) and of the copper(II) analogue

et al. 2020

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The title homoleptic Schiff base complexes, [M(C14H9Cl2N2O)2], for M = CoII, (I), and CuII, (II), present distinct coordination geometries despite the Schiff base dianion coordinating via the phenolato-O and imine-N atoms in each case. For (I), the coordination geometry is based on a trigonal bipyramid whereas for (II), a square-planar geometry is found (Cu site symmetry \overline{1}). In the crystal of (I), discernible supramolecular layers in the ac plane are sustained by chlorobenzene-C—H...O(coordinated), chlorobenzene-C—H...π(fused-benzene ring) as well as π(fused-benzene, chlorobenzene)–π(chlorobenzene) interactions [inter-centroid separations = 3.6460 (17) and 3.6580 (16) Å, respectively]. The layers inter-digitate along the b-axis direction and are linked by dichlorobenzene-C—H...π(fused-benzene ring) and π–π interactions between fused-benzene rings and between chlorobenzene rings [inter-centroid separations = 3.6916 (16) and 3.7968 (19) Å, respectively] . Flat, supramolecular layers are also found in the crystal of (II), being stabilized by π–π interactions formed between fused-benzene rings and between chlorobenzene rings [inter-centroid separations = 3.8889 (15) and 3.8889 (15) Å, respectively]; these stack parallel to [10\overline{1}] without directional interactions between them. The analysis of the respective calculated Hirshfeld surfaces indicate diminished roles for H...H contacts [26.2% (I) and 30.5% (II)] owing to significant contributions by Cl...H/H...Cl contacts [25.8% (I) and 24.9% (II)]. Minor contributions by Cl...Cl [2.2%] and Cu...Cl [1.9%] contacts are indicated in the crystals of (I) and (II), respectively. The interaction energies largely arise from dispersion terms; the aforementioned Cu...Cl contact in (II) gives rise to the most stabilizing interaction in the crystal of (II).

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Zn(II) and Co(III) metallosupramolecular assemblies derived from a rigid bis-Schiff base ligand

Cited by 16 publications

References 37 publications

Deaggregation properties and transmetalation studies of a zinc(ii) salen-type Schiff-base complex

Deaggregation properties and transmetalation studies of a zinc(ii) salen-type Schiff-base complex

Synthesis and structural characterization of zinc(II) and cobalt(II) complexes based on multidentate hydrazone ligands

Crystal structure, Hirshfeld surface analysis and computational study of bis(2-{[(2,6-dichlorobenzylidene)hydrazinylidene]methyl}phenolato)cobalt(II) and of the copper(II) analogue

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