scholarly journals Lead Based Metal Organic Frameworks(Pb-MOFs): Anion Influence, Luminescence and Gas Adsorption Study

2019 ◽  
Vol 70 (10) ◽  
pp. 3545-3548
Keyword(s):  
Surface Area ◽  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Lead Nitrate ◽  
Bidentate Ligands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Capacities ◽  
Metal Organic ◽  
Organic Linker

Two Lead based organic frameworks (1 & 2) have been synthesized using 4,6-dihydroxy-2-mercaptopyrimidine (H2DMP) as organic linker. Lead nitrate (1) and Lead acetate (2) salts were used to investigate their influence on morphology of resulting MOFs, adsorption capacities and luminescence behaviour. Structure and morphology of these MOFs was established on the basis of UV/Vis, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), 1H NMR, energy dispersive spectroscopy (EDS), thermogravimetric analysis (TGA) and X-ray diffraction technique. Brunauer-Emmett-Teller (BET) studies revealed better N2 adsorption capacity for 1 (surface area 814 m2/g) when compared with 2 (surface area 196 m2/g). Photoluminescence behaviour of (1 & 2) was investigated in solid state at room temperature and has been attributed to metal-centred s®p transition. Keywords: Bidentate ligands, Lead, Luminescence, Metal organic frameworks

scholarly journals Lead Based Metal Organic Frameworks(Pb-MOFs): Anion Influence, Luminescence and Gas Adsorption Study

2019 ◽  
Vol 70 (10) ◽  
pp. 3545-3548
Author(s):  
Shamaila Iram ◽  
Muhammad Imran ◽  
Farah Kanwal ◽  
Shoomaila Latif ◽  
Zafar Iqbal
Keyword(s):  
Surface Area ◽  
Room Temperature ◽  
Gas Adsorption ◽  
Lead Nitrate ◽  
X Ray Diffraction ◽  
N2 Adsorption ◽  
X Ray ◽  
Adsorption Capacities ◽  
Metal Organic ◽  
Organic Linker

Two Lead based organic frameworks (1&2) have been synthesized using 4,6-dihydroxy-2-mercaptopyrimidine (H2DMP) as organic linker. Lead nitrate (1) and Lead acetate (2) salts were used to investigate their influence on morphology of resulting MOFs, adsorption capacities and luminescence behaviour. Structure and morphology of these MOFs was established on the basis of UV/Vis, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), 1H NMR, energy dispersive spectroscopy (EDS), thermogravimetric analysis (TGA) and X-ray diffraction technique. Brunauer-Emmett-Teller (BET) studies revealed better N2 adsorption capacity for 1 (surface area 814 m2/g) when compared with 2 (surface area 196 m2/g). Photoluminescence behaviour of (1&2) was investigated in solid state at room temperature and has been attributed to metal-centred s�p transition.

scholarly journals Remodelling a Shp: Transmetallation in a Rare-Earth Cluster-Based Metal–Organic Framework

2021 ◽  
Author(s):  
Hudson de Aguiar Bicalho ◽  
P. Rafael Donnarumma ◽  
Victor Quezada-Novoa ◽  
Hatem M. Titi ◽  
Ashlee J Howarth
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Surface Area ◽  
De Novo ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Metal Exchange ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic

<div> <p>Post-synthetic modification (PSM) of metal–organic frameworks (MOFs) is an important strategy for accessing MOF analogues that cannot be easily synthesized <i>de novo</i>. In this work, the rare-earth (RE) cluster-based MOF, Y-CU-10, with <b>shp</b> topology was modified through transmetallation using a series of RE ions, including: La(III), Nd(III), Eu(III), Tb(III), Er(III), Tm(III), and Yb(III). In all cases, metal-exchange higher than 70 % was observed, with reproducible results. All transmetallated materials were fully characterized and compared to the parent MOF, Y-CU-10, in regards to crystallinity, surface area, and morphology. Additionally, single-crystal X-ray diffraction (SCXRD) measurements were performed to provide further evidence of transmetallation occurring in the nonanuclear cluster nodes of the MOF. </p> </div>

scholarly journals Crystallographic characterization of the metal–organic framework Fe2(bdp)3 upon reductive cation insertion

2020 ◽  
Vol 11 (34) ◽  
pp. 9173-9180 ◽  
Author(s):  
Naomi Biggins ◽  
Michael E. Ziebel ◽  
Miguel I. Gonzalez ◽  
Jeffrey R. Long
Keyword(s):  
Single Crystal ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
Organic Framework

Single-crystal X-ray diffraction reveals structural influences on gas adsorption properties in anionic metal–organic frameworks.

Bismuth and lead based metal organic frameworks: morphological, luminescence and Brunauer-Emmett-Teller (BET) studies

2020 ◽  
Vol 38 (1) ◽  
pp. 132-137
Author(s):  
Shamaila Iram ◽  
Muhammad Imran ◽  
Farah Kanwal ◽  
Shoomaila Latif ◽  
Zafar Iqbal
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
H Nmr ◽  
Morphological Studies ◽  
Charge Transfer Transitions ◽  
Metal Organic ◽  
Ft Ir ◽  
Organic Linker

AbstractBiphenyl-4,4′-dicarboxylic acid (H2BDA) was used as an organic linker to synthesize bismuth and lead based organic frameworks (1 and 2). The structural/morphological studies of these metal organic frameworks (MOFs) were done using UV-Vis, Fourier transform infrared spectroscopy (FT-IR), 1H NMR, energy dispersive spectroscopy (EDXS), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and powder X-ray diffraction method. Surface area as determined by Brunauer-Emmett-Teller (BET) studies revealed better N2 gas adsorption for MOF (1) compared to MOF (2). Both these MOFs exhibited good luminescence activity which was attributed to ligand-to-metal charge transfer transitions (LMCT).

scholarly journals Remodelling a Shp: Transmetallation in a Rare-Earth Cluster-Based Metal–Organic Framework

2021 ◽  
Author(s):  
Hudson de Aguiar Bicalho ◽  
P. Rafael Donnarumma ◽  
Victor Quezada-Novoa ◽  
Hatem M. Titi ◽  
Ashlee J Howarth
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Surface Area ◽  
De Novo ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Metal Exchange ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic

<div> <p>Post-synthetic modification (PSM) of metal–organic frameworks (MOFs) is an important strategy for accessing MOF analogues that cannot be easily synthesized <i>de novo</i>. In this work, the rare-earth (RE) cluster-based MOF, Y-CU-10, with <b>shp</b> topology was modified through transmetallation using a series of RE ions, including: La(III), Nd(III), Eu(III), Tb(III), Er(III), Tm(III), and Yb(III). In all cases, metal-exchange higher than 70 % was observed, with reproducible results. All transmetallated materials were fully characterized and compared to the parent MOF, Y-CU-10, in regards to crystallinity, surface area, and morphology. Additionally, single-crystal X-ray diffraction (SCXRD) measurements were performed to provide further evidence of transmetallation occurring in the nonanuclear cluster nodes of the MOF. </p> </div>

Synthesis and Characterization of Zn-Carboxylate Metal–Organic Frameworks Containing Triazatruxene Ligands

2019 ◽  
Vol 72 (10) ◽  
pp. 786 ◽  
Author(s):  
Adil Alkas ◽  
Shane G. Telfer
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
Cubic Crystal ◽  
X Ray ◽  
Metal Organic ◽  
Zinc Clusters ◽  
Solvothermal Conditions

Reactions between triazatruxene-based tricarboxylate ligands, H3tat-R, and zinc nitrate under solvothermal conditions afforded new metal–organic frameworks (MOFs) with the general formula [Zn3(tat-R)2(H2O)2], MUF-tat-R (R=a hydrocarbon substituent on the triazatruxene nitrogen atoms). Single-crystal X-ray diffraction analysis revealed that these frameworks are 3D networks with a (10,3)-a topology. Linear trinuclear zinc clusters are connected to tat ligands to form chiral channels that accommodate the substituents on the tat ligands. MUF-tat and MUF-tat-benzyl crystallize in a cubic crystal system whereas MUF-tat-butyl and MUF-tat-hexyl are tetragonal. MUF-tat-benzyl retains its porosity on activation, which was confirmed by gas adsorption studies.

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.

scholarly journals In situ X‐ray Diffraction Investigation of the Crystallisation of Perfluorinated Ce(IV)‐based Metal‐Organic Frameworks with UiO‐66 and MIL‐140 architectures

2021 ◽  
Author(s):  
Stephen J. I. Shearan ◽  
Jannick Jacobsen ◽  
Ferdinando Costantino ◽  
Roberto D’Amato ◽  
Dmitri Novikov ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic

Hydrothermal Treatment of Coprecipitated YSZ Powders

2010 ◽  
Vol 660-661 ◽  
pp. 983-988 ◽  
Author(s):  
Alexander Rodrigo Arakaki ◽  
Walter Kenji Yoshito ◽  
Valter Ussui ◽  
Dolores Ribeiro Ricci Lazar
Keyword(s):  
Surface Area ◽  
Hydrothermal Treatment ◽  
Gas Adsorption ◽  
X Ray Diffraction ◽  
Electronic Microscopy ◽  
Immersion Method ◽  
Cubic Symmetry ◽  
X Ray ◽  
Granulometric Analysis ◽  
Symmetry Surface

Zirconia stabilized with 8.5 mol% yttria (YSZ) were synthesized by coprecipitation and resulting gels were hydrothermallly treated at 200°C and 220 PSI for 4, 8 and 16 hours. Products were oven dried at 70°C for 24 hours, isostatically pressed as pellets and sintered at 1500 °C for 1 hour. Powders were characterized for surface area with N2 gas adsorption, X-ray diffraction, laser diffraction granulometric analysis and scanning and transmission electronic microscopy. Density of ceramics was measured by an immersion method based on the Archimedes principle. Results showed that powders dried at 70°C are amorphous and after treatment has tetragonal/cubic symmetry. Surface area of powders presented a significant reduction after hydrothermal treatment. Ceramics prepared from hydrothermally treated powders have higher green density but sintered pellets are less dense when compared to that made with powders calcined at 800°C for 1 hour due to the agglomerate state of powders. Solvothermal treatment is a promising procedure to enhance density.

A series of microporous and robust Ln-MOFs showing luminescent properties and catalytic performances towards Knoevenagel reactions

2021 ◽  
Author(s):  
Qing-Xia Yao ◽  
Miaomiao Tian ◽  
Jun Zheng ◽  
Jintang Xue ◽  
Xuze Pan ◽  
...  
Keyword(s):  
Single Crystal ◽  
Metal Organic Frameworks ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
Catalytic Performances

A series of microporous Ln(III)-based metal-organic frameworks (1-Ln) have been hydrothermally synthesized by using 4,4',4''-nitrilotribenzoic acid (H3NTB). Single crystal X-ray diffraction analyses show 1-Ln are isostructural and have 3D porous...

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