pH and molar ratio dependent formation of monomeric, dimeric and tetrameric cobalt malate complexes

Liu, Qiong-Xin; Ni, Lubin; Liang, Fu‐Pei; Zhou, Zhao‐Hui; Wan, Huilin

doi:10.1016/j.poly.2009.01.017

Cited by 21 publications

(6 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the hydrothermal technique has been extensively used to create novel structures, from the crystal engineering point of view, the control of self-assembly processes is still a very challenging work for realizing the target syntheses of the multidimensional MOFs based on V-shaped polycarboxylate ligands. Many factors, such as the coordination geometry of metal ions, medium, template, metal–ligand ratio, pH value, and counterion, can significantly affect the formation of coordination frameworks . The pH value of the reaction, as one of the external stimuli, is especially important in the assembly of such MOFs.…”

Section: Introductionmentioning

confidence: 99%

pH Influence on the Structural Variations of 4,4′-Oxydiphthalate Coordination Polymers

Yang

Zhang

Cheng

et al. 2011

Crystal Growth & Design

125

View full text Add to dashboard Cite

Five new Zn(II)/ODPT/bpe compounds, namely, {[Zn(bpe)(H 2 O) 2 ](H 2 ODPT)•3H 2 O} n (1), {[Zn 4 (ODPT) 2 -(bpe) 3 (H 2 O) 2 ] 2 (bpe)•7H 2 O} n (2), {[Zn 2 (ODPT)(bpe) 2 ] 2 • 7H 2 O} n (3), {Zn 4 (ODPT) 2 (bpe)} n (4), and {Zn 2 (ODPT)-(bpe)(H 2 O) 2 } n (5) (ODPT = 4,4′-oxidiphthalate, bpe =1,2bis(4-pyridyl)ethane), have been synthesized through a hydrothermal method under different pH conditions, and characterized by single-crystal X-ray diffraction, element analysis, infrared spectra (IR), and thermogravimetric (TG) analyses. Compound 1 shows a 3D network framework constructed by the 1D linear [Zn(bpe)(H 2 O) 4 ] n2+ cationic chains through extensive hydrogenbonding. Compound 2 displays an unusual three-dimensional (3D) meso-racemic self-penetrating coordination network with distinct chiral information in the interpenetrating networks. Compound 3 features a novel 4-connected (4•6 2 •8 3 )(4 2 •6 2 •8 2 ) topology, also exhibiting an intriguing 3D self-penetrating structure formed by triple-and double-stranded helical chain motifs. Compounds 4 and 5 are based upon 3D pillared-layer frameworks constructed from Zn 2+ and ODPT 4-, and further consolidated by the bpe ligands as molecular pillars. The most striking feature of 5 is that achiral ODPT 4− ligands link the Zn cations into right-handed 2 1 helical chains, and the chiral information is transferred to the 3D framework with a chiral space group C222 1 . The diversity of the product structures illustrates the marked sensitivity of the coordination chemistry of the V-shaped multicarboxylate ligand (H 4 ODPT) to the pH value of the solution. Moreover, the thermal dynamic properties and fluorescent properties of all compounds are also investigated.

show abstract

Section: Introductionmentioning

confidence: 99%

pH Influence on the Structural Variations of 4,4′-Oxydiphthalate Coordination Polymers

Yang

Zhang

Cheng

et al. 2011

Crystal Growth & Design

125

View full text Add to dashboard Cite

show abstract

“…Significant difference in the position of maximum emission of Schiff base and each metal(II) complexes which is due to the coordination of the metal(II) ion to the ligand. Quenching of fluorescence through complexation is much interesting as it opens up the opportunity for photochemical applications of these complexes [23][24][25].…”

Section: Fluorescence Spectral Studiesmentioning

confidence: 99%

Synthesis, physicochemical, thermal, fluorescence and catalytic activity studies of novel Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate (ONS) Schiff base ligand

et al. 2017

View full text Add to dashboard Cite

Syntheses and physicochemical studies of Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate Schiff base ligand (E)-2-((1-(thiophen-2-yl)ethylidene)amino)phenol (HL) (ATS) were characterized by elemental analysis, FT-IR, Mass, 1 H NMR, UV-Vis, magnetic moment, thermal analysis (TG and DTG) techniques, molar conductance and fluorescence spectra. The IR spectra showed that complexes were coordinated in metal ions via the imine N, O and S atoms. Magnetic and UV-Vis spectra, indicated that the geometrical structure of Mn(II), Co(II) and Ni(II) complexes are an octahedral while Cu(II) is a tetrahedral. The kinetic thermodynamic parameters such as E*, H*, S* and G* were determined for each thermal degradation stage of TG curves of the metal(II) complexes using Coat-Redfern method. Fluorescence studies indicated that the Schiff base ligand HL (ATS), and its metal(II) complexes can serve as potential photoactive materials as indicated from their characteristic fluorescence properties and study the effect of solvent and pH on it. The catalytic activities of metal(II) complexes were studied using H2O2 solution. KEYWORDSONS donor sites Catalytic activity Thermal analysis Schiff base ligand Metals complexes Fluorescence spectra 2-((1-(Thiophen-2-yl)ethylidene)amino)phenol Cite this: Eur.

show abstract

“…Up to now, various synthetic strategies have been developed to fabricate crystalline MOFs, e.g., mixed-ligand method, template-directed synthesis, pillar-layered strategy, second building unit method [7][8][9][10]. However, the structures of MOFs are sensitive to various reaction conditions, including reaction temperature, reaction solvent, pH value, auxiliary ligand, reactant stoichiometry, template agent, the functionality of the organic ligands, and so on [11][12][13][14][15]. Each change of the above factors may result in signi cant changes in the topology and structure.…”

Section: Introductionmentioning

confidence: 99%

Assembly of Two New Coordination Polymers: Luminescent Properties and Anti-inflammatory Activity on Postoperative Infectious Endophthalmitis

Bian

Zhang²,

2021

Preprint

View full text Add to dashboard Cite

The solvothermal reactions via the self-assemble approach produced two new metal-organic compounds, i.e, [Zn(4-cptpy)(HCOO)(H2O)]n·n(DMF) (1) and [Cd3(btc)2(4-cptpyH)(DMF)(H2O)3]n (2) (DMF is N,N’-dimethylformamide, H3btc is benzene-1,3,5-tricarboxylic acid, and 4-Hcptpy is 4-[2,6-bis(pyridine-4-yl)pyridine-4-yl]benzoic acid). Furthermore, the compounds’ luminescent performances have also been studied. As a result, compounds 1-2 show intense luminescence at room temperature. The evaluation of their application values against postoperative infectious endophthalmitis (PIE) was implemented and their specific mechanism was investigated. First of all, the real time reverse transcription-polymerase chain reaction (RT-PCR) was performed and the nuclear factor kappa-B (NF-κb) signaling pathway activation levels were measured. In addition to this, the inflammatory cytokines content released after the cataract surgery was determined through exploiting the enzyme linked immunosorbent assay (ELISA) detection kit.

show abstract

pH and molar ratio dependent formation of monomeric, dimeric and tetrameric cobalt malate complexes

Cited by 21 publications

References 37 publications

pH Influence on the Structural Variations of 4,4′-Oxydiphthalate Coordination Polymers

pH Influence on the Structural Variations of 4,4′-Oxydiphthalate Coordination Polymers

Synthesis, physicochemical, thermal, fluorescence and catalytic activity studies of novel Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate (ONS) Schiff base ligand

Assembly of Two New Coordination Polymers: Luminescent Properties and Anti-inflammatory Activity on Postoperative Infectious Endophthalmitis

Contact Info

Product

Resources

About