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Structural diversity, magnetic properties, and luminescent sensing of four coordination polymers based on 6-(3,5-dicarboxylphenyl)nicotinic acid
摘要： Four coordination polymers (CPs), namely, [Ni(HDNA)(bibp)(H2O)]n (1), [Co(HDNA)(bibp)]n (2), {[Co(HDNA)(bibp)]·H2O}n (3) and {[Zn(HDNA)(bibp)]·H2O}n (4), have been synthesized from the mixed-ligand strategy of 6-(3,5-dicarboxylphenyl)nicotinic acid (H3DNA) and 4,4′-bis(benzimidazo-1-ly)benzene (bibp). Structural analyses revealed that four CPs all feature 2D sheets with diverse nets from {44.62}-sql net (1), {Co2(COO)2} SBUs based {44.62}-sql net (2), to 4-connected {65.8} sheet (3 & 4). Besides, the temperature-dependent magnetic susceptibilities of CPs 1-3 were investigated. And the luminescent sensing indicated CP 4 is a good bifunctional sensor for Fe3+ and Cr2O7 2- ions.
关键词： Structural diversity,Coordination polymers,Luminescent sensing,Magnetic property,Polycarboxylic acid ligand
更新于2025-09-23 15:23:52
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Four Co( <scp>ii</scp> ) coordination polymers based on 4,4′-(1 <i>H</i> -1,2,4-triazol-1-yl)methylenebis(benzoic acid): syntheses, structural diversity, magnetic properties, dye adsorption and photocatalytic properties
摘要： Four Co(II) coordination polymers based on 4,4′-(1H-1,2,4-triazol-1-yl)methylenebis(benzoic acid) (H2tmlb), namely: {[Co4(tmlb)4(H2O)]·2CH3CN·4H2O}n (1), {[Co(tmlb)(bbibp)]·1.5CH3OH·2H2O}n (2), {[Co2(tmlb)2(bimmb)]·6CH3CH2OH·4H2O}n (3), and {[Co(tmlb)(bibp)(H2O)]·DMA}n (4) (bbibp = 4,4′-bis(benzoimidazo-1-yl)biphenyl, bimmb = 1,4-bis(imidazol-1-ylmethyl)benzene, bibp = 4,4′-bis(imidazolyl)biphenyl), have been synthesized under solvothermal conditions. Four Co complexes have been characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, thermogravimetric (TG) analysis and powder X-ray diffraction (PXRD). The single-crystal X-ray diffraction analysis reveals that complex 1 shows a two-fold interpenetrating (3,6,6)-connected framework with a Schl?fli symbol of (4·62)2(42·610·83) topology; complex 2 shows a two-fold interpenetrating uninodal 4-connected cds topology with a point symbol of (65·8); complex 3 shows a 2D → 3D supramolecular structure through weak interactions; complex 4 shows a (3,4,6)-connected network with a point symbol of (4·62)2(42·64·93·106)(64·9·10) topology. Furthermore, the variable temperature magnetic susceptibilities of complexes 1–4 have been discussed. Complex 4 can selectively adsorb sulfate-containing dyes by Lewis acid–base interactions. And the four complexes all exhibit excellent photocatalytic capability in degradation of MB/MV.
关键词： Structural diversity,Coordination polymers,Photocatalytic properties,Metal–organic frameworks,Dye adsorption,Magnetic properties
更新于2025-09-19 17:15:36
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Two topologically different 3D Cu <sup>II</sup> metal–organic frameworks assembled from the same ligands: control of reaction conditions
摘要： Bifunctional ligands containing both carboxylic and sulfonate groups can adopt versatile coordination modes to produce novel metal–organic frameworks (MOFs) with high-dimensional networks and interesting topologies. Using 2,20-disulfonylbiphenyl-4,40-dicarboxylic acid (H4L) as a linker and 4,40-bipyridine (4,40-bpy) as a co-ligand, two novel 3D CuII MOFs, {[Cu2(L)(4,40-bpy)2.5(H2O)](cid:2)1.7H2O}n, (1), and {[Cu2(L)(4,40-bpy)2](cid:2)DMA(cid:2)3H2O}n, (2), have been synthesized and structurally characterized by X-ray crystallography (DMA is N,N-dimethylacetamide). MOF (1) shows an unprecedented trinodal 4,4,5-connected network with the Schla¨ ?i symbol (4.62.73)(43.65.7.8)(6.73.8.10), while MOF (2) indicates a binodal 4,6-connected fsc network with the Schla¨ ?i symbol (44.610.8)(44.62). MOFs (1) and (2) were further characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction and thermogravimetric analysis. MOF (1) shows a high water and chemical stability. The proton conductivity of (1) and CO2 adsorption of (2) were also investigated.
关键词： 4,4,5-connected network,topology,structural diversity,2,20-disulfonylbiphenyl-4,40-dicarboxylic acid,water and chemical stability,crystal engineering
更新于2025-09-16 10:30:52
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Cd(II)‐Organic FrameworksFabricated by aN‐Rich Ligand and FlexibleDicarboxylates: Structural Diversity and Multi‐Responsive Luminescent Sensing for Toxic Anions and Ethylenediamine
摘要： Three metal-organic frameworks {[Cd(L)(glu)]·3H2O}∞ (1), {[Cd2(L)2(adi)2]·5H2O}∞ (2) and {[Cd(L)(sub)]·3H2O·DMA }∞ (3) (L = pyridine-3,5-bis(5-azabenzimidazole), H2glu = glutaric acid, H2adi = adipic acid and H2sub = suberic acid) were obtained under solvothermal conditions. Complex 1 shows a 2D (4,4) network constructing of Cd2-glu and Cd-L chains. Complex 2 presents a 2-fold interpenetrating 3D framework with pcu topology. Complex 3 is a 3D framework with cds topology. Three complexes with versatile structures were obtained by changing aliphatic dicarboxylate ligands with different length based on a N-rich ligand. Moreover, the fluorescence measurements indicate that complex 1 is a good multifunctional chemosensor for the detection of Cr2O7 2- and MnO4 - anions by fluorescence quenching effect, and ethylenediamine by fluorescence enhancement effect, with the detection limits of 1.196 ppm, 0.551 ppm and 64.572 ppm, respectively. Both complexes 2 and 3 can selectively sensing Cr2O7 2- anion with the detection limits of 1.126 ppm for 2 and 0.831 ppm for 3 by fluorescence quenching effect.
关键词： N-rich ligand,structural diversity,Cd(II)-organic framework,multi-responsive sensor,Aliphatic dicarboxylate
更新于2025-09-12 10:27:22
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Preface: Two dimensional (2D) hybrid organic-inorganic perovskites
摘要： 2D hybrid organic-inorganic perovskites (HOIPs) have been intensively investigated over the past 30 years before the rise of photovoltaic 3D hybrid perovskites. Along with the increasing research interest on 2D materials, they have attracted much attention. On the one hand, 2D hybrid perovskites possess much improved photo- and chemical stability over their 3D counterparts. On the other hand, the delicate interplay of multiple atomic bonding forces in the crystal lattice enables them to exhibit extraordinary properties that traditional inorganic 2D materials are unable to show. More importantly, the chemical and structural diversity of 2D HOIPs offers greater opportunities to fine-tune and engineer properties and functionalities compared with their 3D counterparts.
关键词： chemical and structural diversity,atomic bonding forces,photo- and chemical stability,2D hybrid organic-inorganic perovskites,photovoltaic
更新于2025-09-09 09:28:46
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Photochemical and Pharmacokinetic Characterization of Orally Administered Chemicals to Evaluate Phototoxic Risk
摘要： This study aimed to verify the applicability of a proposed photosafety screening system based on a reactive oxygen species (ROS) assay and a cassette-dosing pharmacokinetic (PK) study to chemicals with wide structural diversity. The orally taken chemicals, erythromycin, gati?oxacin, 8-methoxypsoralen (MOP), pirfenidone (PFD), tri?uoperazine (TFP), and voriconazole (VRZ), were selected as test compounds. The ROS assay was conducted to evaluate their photoreactivity, and all test compounds excluding erythromycin generated signi?cant ROS under simulated sunlight exposure. According to the ROS data, TFP had potent photoreactivity, and the photoreactivity of 4 other compounds was judged to be moderate. Regarding the oral cassette-dosing PK test in rats, the skin deposition of MOP, PFD, and VRZ was relatively high, and gati?oxacin and TFP exhibited moderate skin deposition properties. Based on the ROS and PK data of test compounds, PFD and TFP were judged to be potent phototoxic compounds, and MOP and VRZ were deduced to have phototoxic risk. The predicted phototoxic risk of test compounds by proposed screening was mostly in agreement with observed in vivo phototoxicity in the rat skin. The proposed screening system could provide reliable photosafety information on orally administered compounds with wide structural diversity.
关键词： cassette-dosing pharmacokinetic study,phototoxicity,structural diversity,reactive oxygen species,photosafety assessment
更新于2025-09-09 09:28:46