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Relevant academic research and scientific papers

A novel porous anionic metal-organic framework with pillared double-layer structure for selective adsorption of dyes

A novel porous anionic metal-organic framework, (Me2NH2)2[Zn2L1.5bpy]·2DMF (BUT-201; H4L=4,8-disulfonaphthalene-2,6-dicarboxylic acid; bpy=4,4-bipyridine; DMF=N,N-dimethylformamide), with pillared double-layer structure has been synthesized through the reaction of a sulfonated carboxylic acid ligand and Zn(NO3)2·6H2O with 4,4-bipyridine as a co-ligand. It is found that BUT-201 can rapidly adsorb cationic dyes with a smaller size such as Methylene Blue (MB) and Acriflavine Hydrochloride (AH) by substitution of guest (CH3)2NH2+, but has no adsorption towards the cationic dyes with a lager size such as Methylene Violet (MV), the anionic dyes like C. I. Acid Yellow 1 (AY1) and neutral dyes like C. I. Solvent Yellow 7 (SY7), respectively. The results show that the adsorption behavior of BUT-201 relates not only to the charge but also to the size/shape of dyes. Furthermore, the adsorbed dyes can be gradually released in the methanol solution of LiNO3.

Highly selective fluorescent turn-on-off sensing of OH?, Al3+and Fe3+ions by tuning ESIPT in metal organic frameworks and mitochondria targeted bio-imaging

Herein we report a multifunctional high performance metal organic framework (Zn-DHNDC MOF) based chemosensor that displays an exceptional excited state intramolecular proton transfer (ESIPT) tuned fluorescence turn-on-off response for OH?, Al3+and Fe3+ions along with mitochondria targeted bio-imaging. Properly tuning ESIPT as well as the hydroxyl group (-OH) allows Zn-DHNDC MOF to optimize and establish chelation enhanced fluorescence (CHEF) and chelation enhanced quenching (CHEQ) based sensing mechanisms. The MOF benefits from acid-base interactions with the ions which generate a turn-on bluish green fluorescence (λEm492 nm) for OH?, an intense turn-on green fluorescence (λEm528 nm) for Al3+and a turn-off fluorescence quenching response for Fe3+ions. The aromatic -OH group indeed plays its part in triggering CHEF and CHEQ processes responsible for the turn-on-off events. Low limits of detection (48 nM of OH?, 95 nM for Al3+, 33 nM for Fe3+ions), high recyclability and fast response time (8 seconds) further assist the MOF to implement an accurate quantitative sensing strategy for OH?, Al3+and Fe3+ions. The study further demonstrates the MOF's behaviour in cellular medium by subjecting it to live cell confocal microscopy. Along with a bio-compatible nature the MOF exhibited successful accumulation inside the mitochondria of MCF7 cancer cells, which defines it as a significant bio-marker. Therefore the present work successfully represents the multidisciplinary nature of Zn-DHNDC MOFs, primarily in sensing and biomedical studies.

Sulfonate-Ligated Coordination Polymers Incorporating Paramagnetic Transition Metals

The functionalized linker SNDC (4,8-disulfonyl-2,6-naphthalenedicarboxylate) has been incorporated into 2D extended structures featuring FeII or CoII. These materials are isostructural and exhibit coordination via both the carboxylate and sulfonate groups of the SNDC linker. The variable temperature magnetic behavior of the FeII and CoII materials has also been measured. A simplified model of these systems implies weak (|J| –1) antiferromagnetic coupling, as is expected for a superexchange mechanism operating through the carboxylate paddlewheels. The combination of functionalized linkers, such as SNDC, with paramagnetic metal centers is a promising pathway towards functionalized materials, and the coordination polymers reported join a small class of known materials featuring SNDC.

Diversity of lanthanide(III)-organic extended frameworks with a 4,8-disulfonyl-2,6-naphthalenedicarboxylic acid ligand: Syntheses, structures, and magnetic and luminescent properties

A sulfonate-carboxylate ligand, 4,8-disulfonyl-2,6-naphthalenedicarboxylic acid (H4-DSNDA), and eight new lanthanide coordination polymers { [ P r 4 ( O H )4 ( D S N D A )2 ( H 2 O )1 2 ] ( H 2 O )1 0 } n ( 1 ), [ L n (H2 -DSNDA) 0.5(DSNDA)0.5(H2O)5]n (Ln = La(2), Nd(3), Sm(4), Eu(5), Gd(6), and Dy(7)), and {[Er(H-DSNDA)(H 2O)4](H2O)}n (8)have been synthesized. Detailed crystal structures of these compounds have been investigated. Compound 1 has a 3D framework featuring the unique cubane-shaped [Pr4(μ 3-OH)4] clusters and is a binodal 4,8-connected network with (416·612)(44·6 2)2 topology. Compounds 2-7 are isostructural and have 2D layered structures. Compound 8 is also a 2D layer but belongs to different structural types. The luminescence behavior of compound Eu(5)shows that the π-rich aromatic organic ligands efficiently transfer the absorbed light energy to the Eu(III)ions, thus enhancing the overall luminescent properties of compound Eu(5). The magnetic properties of all compounds except for the diamagnetic La(2)compound have been investigated. In addition, elemental analysis, IR spectra, and thermogravimetric analysis of these compounds are also described.

Enhancing proton conductivity in a metal-organic framework at: T > 80 °c by an anchoring strategy

A new Zr(iv)-based metal-organic framework, termed VNU-23 [Zr6O8(H2O)8(H2SNDC)4], where H2SNDC2- = 4,8-disulfonaphthalene-2,6-dicarboxylate, was synthesized. Subsequently, detailed structural analysis revealed that VNU-23 adopted the bcu topology with a structure characterized by densely packed sulfonic acid groups lining 6 ? channels. With this structural feature, an anchoring strategy was employed to dock the proton transfer agent, histamine, into the void space of VNU-23 to enhance the proton conductivity. Remarkably, the proton conductivity of this material reached 1.79 × 10-2 S cm-1 at 95 °C and 85% relative humidity without any appreciable loss of performance for at least 120 h.

A pillar-layered Cd(II) metal-organic framework for selective detection of organic explosives

The detection of explosives is crucial for homeland security, environmental cleaning, and military issues. As a new class of porous materials, metal-organic frameworks (MOFs) are promising platforms for the detection of organic explosives. In this work, a new pillar-layered Cd(II) MOF, [CdL0.5dpe0.5]·2H2O (BUT-202, H4L?=?4,8-disulfonaphthalene-2,6-dicarboxylic acid, dpe?=?1,2-bis(4-pyridyl)ethylene), was synthesized and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis, infrared spectroscopy, and elemental analysis. BUT-202 has good fluorescent properties, which can be selectively quenched by trace amounts of 2,4,6-trinitrophenol (TNP) in DMF with low detection limit of 0.2?μM.

A new approach for ultra-high adsorption of cationic methylene blue in a Zr-sulfonic-based metal-organic framework

A series of Zr-sulfonic-based metal-organic frameworks have been synthesized by the solvothermal method, namely VNU-17 and VNU-23. Particularly, VNU-17 and VNU-23 adopt the sulfonate group (SO3-) moieties densely packed within their structure, which can efficiently uptake MB+ from wastewater. The maximum adsorption capacity for MB+ onto VNU-23 is up to 1992 mg g-1 at pH = 7, which is more than five times that of activated carbon and possesses the highest value among all the reported MOF materials. In addition, VNU-23 retains the adsorption uptake of MB for at least five cycles. The adsorption isotherms and kinetic studies reveal that MB+ dye adsorption onto VNU-23 fits a Langmuir isotherm and the pseudo second order kinetic model. Furthermore, the ultra-high adsorption capacity of VNU-23 for MB dye can be accounted for by the suitable pore/channel size together with electrostatic attraction and π-π interactions. These results indicate that VNU-23 can be utilized as a promising candidate for removing MB+ from an aqueous medium. This journal is