Metal–organic framework in an l-arginine copper(ii) ion polymer: structure, properties, theoretical studies and microbiological activity

RSC Advances ◽  
2015 ◽  
Vol 5 (46) ◽  
pp. 36295-36306 ◽  
Author(s):  
Agnieszka Wojciechowska ◽  
Anna Gągor ◽  
Wiktor Zierkiewicz ◽  
Anna Jarząb ◽  
Agnieszka Dylong ◽  
...  
Keyword(s):  
Uv Spectroscopy ◽  
Metal Organic Framework ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Metal Organic ◽  
Ft Ir ◽  
Electron Paramagnetic ◽  
Microbiological Properties ◽  
Structure Properties

A novel 1D polymeric copper(ii) complex of formula {[Cu(l-Arg)2(μ-4,4′-bpy)]Cl2·3H2O∞} was synthesized and characterized using X-ray diffraction, FT-IR, Raman, electron paramagnetic resonance and NIR-vis-UV spectroscopy, and its microbiological properties were analyzed.

Electrochemical Study of Bimetal Organic Frameworks with Graphene Oxide for Lithium-Sulfur Cells as Nanoarchitectonics

2020 ◽  
Vol 20 (5) ◽  
pp. 2746-2749 ◽  
Author(s):  
Woo-Seop Song ◽  
Yongju Jung ◽  
Seok Kim
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Reaction ◽  
Metal Organic Framework ◽  
X Ray Diffraction ◽  
Micro Structure ◽  
X Ray ◽  
Infra Red ◽  
Metal Organic ◽  
Ft Ir ◽  
Structure Properties

We studied that hybrid material of metal organic framework, using two different metals (bimetal organic frameworks), containing graphene oxide (GO) as a sulfur immobilizing host was successfully synthesized by hydrothermal reaction. Composites were prepared using ligands of varying ratios to observe the structure properties depending on the amount of ligand used. Field emission scanning electron microscopy (FE-SEM), Fourier Transform Infra-Red Spectroscopy (FT-IR), and X-ray diffraction (XRD) were conducted to determine the morphology and micro-structure of the composite. Electrochemical properties were characterized by cyclic voltammetry (CV) and galvanostatic charge–discharge tests. Based on these study, bimetal organic frameworks showed different morphology by ligand amounts and the enhanced performance for Li–S battery cathode.

scholarly journals Electrospun Nanosystems Based on PHBV and ZnO for Ecological Food Packaging

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2123
Author(s):  
Maria Râpă ◽  
Maria Stefan ◽  
Paula Popa ◽  
Dana Toloman ◽  
Cristian Leostean ◽  
...  
Keyword(s):  
Food Packaging ◽  
Spin Trapping ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
Hno3 Solution ◽  
X Ray ◽  
Trapping Method ◽  
Ft Ir ◽  
Doped Zno ◽  
Electron Paramagnetic

The electrospun nanosystems containing poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and 1 wt% Fe doped ZnO nanoparticles (NPs) (with the content of dopant in the range of 0–1 wt% Fe) deposited onto polylactic acid (PLA) film were prepared for food packaging application. They were investigated by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), antimicrobial analysis, and X-ray photoelectron spectrometry (XPS) techniques. Migration studies conducted in acetic acid 3% (wt/wt) and ethanol 10% (v/v) food simulants as well as by the use of treated ashes with 3% HNO3 solution reveal that the migration of Zn and Fe falls into the specific limits imposed by the legislation in force. Results indicated that the PLA/PHBV/ZnO:Fex electrospun nanosystems exhibit excellent antibacterial activity against the Pseudomonas aeruginosa (ATCC-27853) due to the generation of a larger amount of perhydroxyl (˙OOH) radicals as assessed using electron paramagnetic resonance (EPR) spectroscopy coupled with a spin trapping method.

Synthesis, crystal structures and characterizations of three new copper(II) complexes including anti-inflammatory diclofenac

2019 ◽  
Vol 75 (4) ◽  
pp. 388-397 ◽  
Author(s):  
Sevim Hamamci Alisir ◽  
Necmi Dege ◽  
Recep Tapramaz
Keyword(s):  
Thermal Analysis ◽  
Ir Spectroscopy ◽  
Magnetic Data ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Ft Ir ◽  
Fourier Transform Ir ◽  
Electron Paramagnetic ◽  
Ft Ir Spectroscopy

Three new diclofenac-based copper(II) complexes, namely tetrakis{μ-2-[2-(2,6-dichloroanilino)phenyl]acetato-κ2 O:O′}bis(methanol-κO)copper(II), [Cu2(μ-dicl)4(CH3OH)2] (1), bis{2-[2-(2,6-dichloroanilino)phenyl]acetato-κ2 O,O′}bis(1-vinyl-1H-imidazole-κN 3)copper(II), [Cu(dicl)2(vim)2] (2), and bis{2-[2-(2,6-dichloroanilino)phenyl]acetato-κ2 O,O′}bis(1H-imidazole-κN 3)copper(II), [Cu(dicl)2(im)2] (3) [dicl is diclofenac (C14H10Cl2NO2), vim is 1-vinylimidazole (C5H6N2) and im is imidazole (C3H4N2)], have been synthesized and characterized by elemental analysis, FT–IR spectroscopy, thermal analysis and single-crystal X-ray diffraction. X-ray diffraction analysis shows that complex 1 consists of dimeric units in which the dicl ligand exhibits a bidentate syn,syn-μ2 coordination mode linking two copper(II) centres. Complexes 2 and 3 have mononuclear units with the general formula [Cu(dicl)2 L 2] (L is vim or im) in which the CuII ions are octahedrally coordinated by two L and two dicl chelating ligands. The L and dicl ligands both occupy the trans positions of the coordination octahedron. The different coordination modes of dicl in the title complexes were revealed by Fourier transform IR (FT–IR) spectroscopy. The spin matching between the copper(II) centres in the dimeric [Cu2(μ-dicl)4(CH3OH)2] units was also confirmed by magnetic data to be lower than the spin-only value and electron paramagnetic resonance (EPR) spectra. The thermal properties of the complexes were investigated by thermogravimetric (TG) and differential thermal analysis (DTA) techniques.

scholarly journals Construction of C-C bonds via photoreductive coupling of ketones and aldehydes in the metal-organic-framework MFM-300(Cr)

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tian Luo ◽  
Lili Li ◽  
Yinlin Chen ◽  
Jie An ◽  
Chengcheng Liu ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance Spectroscopy ◽  
Metal Organic Framework ◽  
Photochemical Synthesis ◽  
Resonance Spectroscopy ◽  
Reductive Coupling ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
Aldehydes And Ketones ◽  
Metal Organic ◽  
Electron Paramagnetic

AbstractConstruction of C-C bonds via reductive coupling of aldehydes and ketones is hindered by the highly negative reduction potential of these carbonyl substrates, particularly ketones, and this renders the formation of ketyl radicals extremely endergonic. Here, we report the efficient activation of carbonyl compounds by the formation of specific host-guest interactions in a hydroxyl-decorated porous photocatalyst. MFM-300(Cr) exhibits a band gap of 1.75 eV and shows excellent catalytic activity and stability towards the photoreductive coupling of 30 different aldehydes and ketones to the corresponding 1,2-diols at room temperature. Synchrotron X-ray diffraction and electron paramagnetic resonance spectroscopy confirm the generation of ketyl radicals via confinement within MFM-300(Cr). This protocol removes simultaneously the need for a precious metal-based photocatalyst or for amine-based sacrificial agents for the photochemical synthesis.

scholarly journals Fluorescein Hydrazide-Appended Metal–Organic Framework as a Chromogenic and Fluorogenic Chemosensor for Mercury Ions

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5773
Author(s):  
Aasif Helal ◽  
Muhammed Naeem ◽  
Mohammed Fettouhi ◽  
Md. Hasan Zahir
Keyword(s):  
Photoelectron Spectroscopy ◽  
Tap Water ◽  
Metal Organic Framework ◽  
X Ray Diffraction ◽  
Green Fluorescence ◽  
Aqueous Emulsion ◽  
X Ray ◽  
Metal Organic ◽  
Ft Ir ◽  
Organic Framework

In this work, we prepared a fluorescein hydrazide-appended Ni(MOF) (Metal–Organic Framework) [Ni3(BTC)2(H2O)3].(DMF)3(H2O)3 composite, FH@Ni(MOF). This composite was well-characterized by PXRD (powder X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), N2 adsorption isotherm, TGA (thermogravimetric analysis), XPS (X-ray photoelectron spectroscopy), and FESEM (field emission scanning electron microscopy). This composite was then tested with different heavy metals and was found to act as a highly selective and sensitive optical sensor for the Hg2+ ion. It was found that the aqueous emulsion of this composite produces a new peak in absorption at 583 nm, with a chromogenic change to a pink color visible to the naked eye upon binding with Hg2+ ions. In emission, it enhances fluorescence with a fluorogenic change to green fluorescence upon complexation with the Hg2+ ion. The binding constant was found to be 9.4 × 105 M−1, with a detection limit of 0.02 μM or 5 ppb. This sensor was also found to be reversible and could be used for seven consecutive cycles. It was also tested for Hg2+ ion detection in practical water samples from ground water, tap water, and drinking water.

scholarly journals Synthesis, structure and hydrogen sorption properties of a pyrazine-bridged copper(I) nitrate metal-organic framework

2019 ◽  
Vol 10 (3) ◽  
pp. 195-200
Author(s):  
Emmanuel Ngwang Nfor ◽  
Andrew David Burrows ◽  
Bridget Ndoye Ndosiri ◽  
Luke Lawrence Keenan ◽  
Offiong Efanga Offiong
Keyword(s):  
Thermal Analysis ◽  
Coordination Polymer ◽  
Metal Organic Framework ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Triclinic System ◽  
Dimensional Network ◽  
Metal Organic ◽  
Ft Ir

A new copper(I) pyrazine-bridged coordination polymer [Cu2(pyz)3(NO3)2]·2DMF] (pyz = pyrazine) (1) has been synthesized and characterized by FT-IR, TG/DTG, DSC and single crystal X-ray diffraction techniques. The X-ray crystallographic result reveals a two-dimensional network structure containing hexagonal pores. Thermal analysis of compound 1 reveals it is stable to 380 °C, and gas sorption studies showed that it adsorbs 1.04 wt% hydrogen at 1 atm and 77 K. Compound 1 crystallizes in a triclinic system, space group P-1 (no. 2), a = 7.9550(2) Å, b = 7.9810(2) Å, c = 11.0660(3) Å, α = 76.328(1)°, β = 71.115(1)°, γ = 84.577(1)°, V = 645.79(3) Å3, Z = 2, T = 150(2) K, μ(MoKα) = 1.709 mm-1, Dcalc = 1.639 g/cm3, 11111 reflections measured (7° ≤ 2Θ ≤ 54.96°), 2951 unique (Rint = 0.0539) which were used in all calculations. The final R1 was 0.0346 (>2σ(I)) and wR2 was 0.0727 (all data).

Synthesis and Crystal Structure of a Mn(II) Metal-Organic Framework Based on a Polydentate Schiff Base Ligand

2013 ◽  
Vol 68 (4) ◽  
pp. 351-356 ◽  
Author(s):  
Jun Li Wang ◽  
Hai Yan Li ◽  
Chen Hong Liu ◽  
Yan Bai
Keyword(s):  
Uv Spectroscopy ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Chair Conformation ◽  
Supramolecular Network ◽  
X Ray Diffraction ◽  
X Ray ◽  
Distorted Octahedral ◽  
Metal Organic ◽  
Organic Framework

A Mn(II) metal-organic framework {[MnL2(NCS)2]·(H2O)4}n (1) with L=bis(pyridin-3-ylmethylene) biphenyl-2,20`-dicarbohydrazide has been synthesized and characterized by IR spectroscopy, elemental analysis, UV spectroscopy, thermogravimetric (TG) analysis, powder X-ray diffraction, and single-crystal X-ray structure determination. The Mn(II) atom has a distorted octahedral coordination environment with an N6 donor set from four ligands and two NCS- anions. The structure of 1exhibits a layer framework containing tetranuclear metallacyclic ring units [MnII4L4] in the chair conformation. In addition, there are multiform O-H···O, C-H···O, N-H···O, and C-H···N hydrogen bonds and C-H···p interactions in a three-dimensional supramolecular network.

Synthesis and Structure of a Clathrated Two-Dimensional Metal-Organic Framework: [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2·H2O (L = Bis(1-pyrazinylethylidene)hydrazine)

2008 ◽  
Vol 73 (1) ◽  
pp. 24-31
Author(s):  
Dayu Wu ◽  
Genhua Wu ◽  
Wei Huang ◽  
Zhuqing Wang
Keyword(s):  
Metal Organic Framework ◽  
Channel Structure ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
X Ray ◽  
Square Planar ◽  
Metal Organic ◽  
Aqueous Meoh ◽  
Organic Framework

The compound [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2 was obtained by the reaction of Cd(ClO4)2, bis(1-pyrazinylethylidene)hydrazine (L) and 4,4'-bipyridine in aqueous MeOH. Single-crystal X-ray diffraction has revealed its two-dimensional metal-organic framework. The 2-D layers superpose on each other, giving a channel structure. The square planar grids consist of two pairs of shared edges with Cd(II) ion and a 4,4'-bipyridine molecule each vertex and side, respectively. The square cavity has a dimension of 11.817 × 11.781 Å. Two guest molecules of bis(1-pyrazinylethylidene)hydrazine are clathrated in every hydrophobic host cavity, being further stabilized by π-π stacking and hydrogen bonding. The results suggest that the hydrazine molecules present in the network serve as structure-directing templates in the formation of crystal structures.

Synthesis, crystal structure, luminescence, and photocatalytic properties of a 2D Cu(II) metal-organic frameworks based on 3,5-di(1H-benzimidazol-1-yl)pyridine and 4,4′-oxybis(benzoate) ligands

2020 ◽  
Vol 75 (8) ◽  
pp. 727-732
Author(s):  
Chen Zhang ◽  
Jian-Qing Tao
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Uv Light ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Metal Organic

AbstractA new Cu(II) metal-organic framework, [Cu(L)(OBA)·H2O]n (1) [H2OBA = 4,4′-oxybis(benzoic acid), L = 3,5-di(1H-benzimidazol-1-yl)pyridine] was hydrothermally synthesized and characterized through IR spectroscopy, elemental and thermal analysis and single-crystal X-ray diffraction. Complex 1 is a four-connected uni-nodal 2D net with a (44·62) topology which shows an emission centered at λ ∼393 nm upon excitation at λ = 245 nm. Moreover, complex 1 possesses high photocatalytic activities for the decomposition of Rhodamine B (RhB) under UV light irradiation.

A MOF based on a lead(II) 2-oxido-6-methylpyridine-4-carboxylate network

2020 ◽  
Vol 75 (4) ◽  
pp. 365-369
Author(s):  
Long Tang ◽  
Yu Pei Fu ◽  
Na Cui ◽  
Ji Jiang Wang ◽  
Xiang Yang Hou ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Carboxylic Acid ◽  
Thermogravimetric Analysis ◽  
Metal Organic Framework ◽  
X Ray Diffraction ◽  
X Ray ◽  
Connected Node ◽  
Metal Organic ◽  
Solid State Fluorescence

AbstractA new metal-organic framework, [Pb(hmpcaH)2]n (1), has been hydrothermally synthesized from Pb(OAc)2 · 3H2O and 2-hydroxy-6-methylpyridine-4-carboxylic acid (hmpcaH2; 2), and characterized by IR spectroscopy, elemental and thermogravimetric analysis, and single-crystal X-ray diffraction. In complex 1, each hmpcaH− ligand represents a three-connected node to combine with the hexacoordinated Pb(II) ions, generating a 3D binodal (3,6)-connected ant network. The crystal structure of 2 was determined. The solid-state fluorescence properties of 1 and 2 were investigated.

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