Impact of N-donor auxiliary ligands on two new Co(II)-based MOFs with N-heterocyclic ligands and magnetism study

Two new cobalt(II) MOFs, namely [Co2(L)2(4,4′-bipy)]n (1) and {[Co(L)(dib)0.5(H2O)2]·H2O}n (2) were obtained by the self-assembly of Co(NO3)2·6H2O with V-shaped 2,4-[6-(4-carboxyphenyl)pyrazin-2-yl]benzoic acid (H2L) in the presence of two bridging auxiliary N-donor...

Metal/Carboxylate-Induced Versatile Structures of Nine 0D → 3D Complexes with Different Fluorescent and Electrochemical Behaviors

To investigate the effect of the polycarboxylates and metal ions on the assembly and structures of complexes based on a thiophene-containing bis-pyridyl-bis-amide N,N'-bis(pyridine-3-yl)thiophene-2,5-dicarboxamide (3-bptpa) ligand, nine 0D → 3D complexes of [Ni₂(3-bptpa)₄(1,2-BDC)₂(H₂O)₂] (1), [Ni(3-bptpa)(IP)(H₂O)₂]·H₂O (2), [Ni(3-bptpa)(5-MIP)(H₂O)₂]·H₂O (3), [Ni(3-bptpa)(5-NIP)(H₂O)] (4), [Ni(3-bptpa)(5-AIP)]·2H₂O (5), [Ni₂(OH)(3-bptpa)(1,3,5-BTC)]·DMA·5H₂O (6), [Cu(3-bptpa)(5-MIP)]·3H₂O (7), [Cu(3-bptpa)(5-AIP)(H₂O)_0.25]·H₂O (8), and [Cu(3-bptpa)(1,3,5-HBTC)] (9) (1,2-H₂BDC = 1,2-benzenedicarboxylic acid, H₂IP = 1,3-benzenedicarboxylic acid, 5-H₂MIP = 5-methylisophthalic acid, 5-H₂NIP = 5-nitroisophthalic acid, 5-H₂AIP = 5-aminoisophthalic acid, DMA = N,N'-dimethylacetamide, and 1,3,5-H₃BTC = 1,3,5-benzenetricarboxylic acid) have been hydrothermally/solvothermally synthesized and structurally characterized by IR, thermogravimetric, powder X-ray diffraction, and single-crystal X-ray diffraction. Complex 1 is a zero-dimensional (0D) bimetallic complex. Complexes 2 and 3 feature two similar one-dimensional ladderlike structures. Complex 4 displays a two-dimensional (2D) 4-connected network based on single-metallic nodes. Complex 5 shows a 2D double-layer structure containing a pair of 6³ [Ni(5-AIP)] honeycomblike sheets. Complex 6 is a 3,5-connected three-dimensional (3D) framework derived from bimetallic nodes and 6³ [Ni₂(OH)(1,3,5-BTC)] honeycomblike sheets. Complex 7 displays a 2D 4-connected grid based on bimetallic nodes. Complex 8 features a 2D double-layer structure based on two 4-connected [Cu(3-bptpa)(5-AIP)] sheets and bridging coordinated water molecules. Complex 9 is a 2D structure extended by incomplete deprotonation of 1,3,5-HBTC and 3-bptpa linkers. The effect of the metal ions and polycarboxylates on the structures of the title complexes was discussed, and the fluorescent properties of 1-9 were investigated. The carbon paste electrodes bulk-modified by complexes 3, 5, and 6-9 show different electrocatalytic activities for the oxidation of ascorbic acid as well as the reduction of hydrogen peroxide, nitrites, and bromates.

Versatile carboxylate-directed structures of ten 1D → 3D Ni(ii) coordination polymers: fluorescence behaviors and electrochemical activities

Ten 1D → 3D Ni(ii) coordination polymers based on a phenyl/methylene-mixed-bridged ligand have been obtained and structurally directed by carboxylates; they show different fluorescence behaviors and electrochemical activities.

The utilization of a stable 2D bilayer MOF for simultaneous study of luminescent and photocatalytic properties: experimental studies and theoretical analysis

A new Pb(ii)-based 2D MOF comprising π-conjugated ligand 4'-(1H-tetrazol-5-yl)-[1,1'-biphenyl]-3,5-dicarboxylic acid (TZBPDC) and having the formula {[PbNa(TZBPDC)](H2O)(DMF)2} n (1) has been synthesized. Structural characterization of 1 indicates that the MOF has a 4-connected (4,4) motif. The photoluminescent investigation indicates that 1 can behave as potential luminescent sensor for the detection of nitroaromatic compounds (NACs), especially 2,4-dinitrophenol (2,4-DNP) and ferric ions, through the decrease in its luminescence intensity. Additionally, 1 also displays excellent capacity for the photodegradation of methylene orange (MO), which is a constituent of wastewater discharge. The most plausible mechanisms for the decrease in the luminescent intensity of 1 in the presence of different NACs have been explored though theoretical calculations, and the photocatalysis of 1 for organic dyes has been addressed using density of states (DOS) and partial DOS calculations.

Ultrasound irradiation effect on morphological properties of a 3D nano zinc(II) supramolecular coordination polymer

Nano-structures of [Zn(L)(atpt)]_n (1) (L=1,2-bis(2-methylbenzimidazol-1-ylmethyl)benzene and H₂atpt=2-aminoterephthalic acid) were obtained by hydrothermal and sonochemical approaches, characterized by scanning electron microscopy (SEM), IR, powder X-ray diffraction (PXRD), and elemental analysis. CP 1 features a 2D (4,4) network with the point symbol {4⁴.6²}, the 3D supramolecular architecture in CP 1 is controlled through π⋯π stacking interactions. The influence of various concentrations of initial reagents, power of ultrasound irradiation, and ultrasound time on the morphology and size of nano-structured CP 1 were studied in detail. In addition, the luminescence and photocatalytic properties of the nanoparticles of CP 1 for the degradation of methyl blue (MB) have also been investigated.

Assembly of a series of coordination polymers built from rigid a tetracarboxylate ligand and flexible bis(imidazole) linker: syntheses, structural diversities, luminescence sensing, and photocatalytic properties

Hydrothermal reactions of aromatic terphenyl-4,2'',5'',4'-tetracarboxylic acid (H₄tta) and transitional metal cations in the presence of two flexible N-donor ancillary ligands afforded four novel coordination polymers, namely, {[Zn(tta)_0.5(m-bimb)]·H₂O}_n (1), [Ni₂(tta)(m-bimb)₂(H₂O)]_n (2), [Ni(H₂tta)(o-bimb)·H₂O]_n (3), and [Cd(tta)_0.5(o-bimb)]_n (4), from solvothermal reactions in the presence of bis(imidazole) bridging linkers (m-bimb = 1,3-bis(imidazol-1-ylmethyl)benzene, and o-bimb = 1,2-bis(imidazol-1-ylmethyl)benzene). Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses (EA), powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Compound 1 displayed a 2-fold 3D → 3D parallel entangled (4,4)-connected bbf net with the point symbol of (6⁴·8²)(6⁶)₂. Compound 2 featured a predocumented 3D (4,8)-connected (3²·5³·6)(3⁴·4⁴·5⁹·6¹¹) net. Compound 3 exhibited a 2D 4-connected sql sheet with the point symbol of (4⁴·6²), and compound 4 showed a 2D 4-connected (3²·6²·7²) kgm sheet. To our delight, fluorescence measurements showed that compound 1 could selectively and sensitively detect Cr³⁺ cations and nitrobenzene derivatives (nitrobenzene (NB), p-nitrotoluene (PNT), and p-nitroaniline (PNA)), which suggested that CPs of 1 was a promising bifunctional luminescence sensor material that could sense metal ions and small organic molecules. Moreover, 1 showed excellent photocatalytic activity.

Two pure MOF-photocatalysts readily prepared for the degradation of methylene blue dye under visible light

Two 3D coordination polymers, bridged by 4,4′-bipyridine, were readily synthesized and fully characterized. As efficient photocatalysts in dye degradation under visible light, the mechanism and stability were studied.

Syntheses, structures, luminescent and photocatalytic properties of various polymers based on a “V”-shaped dicarboxylic acid

Four novel luminescent coordination polymers were synthesized under solvothermal conditions, and compounds2–4can serve as a Fe³⁺/Cu²⁺fluorescent sensor through quenching the luminescence, respectively.

A series of pyridyl-amide-based ZnII/CdII coordination polymers and their polypyrrole-functionalized composite materials for tuning their photocatalytic properties

Six pyridyl-amide-based Zn^II/Cd^II coordination polymers have been solvothermally synthesized and decorated by polypyrrole for tuning their photocatalytic properties under visible irradiation.

The assembly of thiophene-based bis-pyridyl-bis-amide CoII coordination polymers and their polypyrrole-functionalized hybrid materials for boosting their photocatalytic performances

A series of thiophene-based bis-pyridyl-bis-amide coordination polymers have been synthesized and decorated with polypyrrole for boosting their photocatalytic properties under visible light irradiation.

The electrochemical properties, nitrogen adsorption, and photocatalytic activities of three 3D metal–organic frameworks bearing the rigid terphenyl tetracarboxylates ligands

Three new 3D complexes derived from the rigid terphenyl tetracarboxylates ligands with different transition metal ions have been successfully prepared. In addition, the title complexes exhibit different properties.

A series of coordination polymers with tuned terphenyl tetracarboxylates and bis-pyridyl ligands with different flexibilities manifesting fluorescence properties and photocatalytic activities

Seven new coordination polymers derived from terphenyl tetracarboxylates and bipyridyl ligands with different flexibilities have been prepared. The electrochemical behaviors, fluorescence and photocatalytic properties have also been studied.

Photocatalysis from a series of polyoxoazocobaltate high-nuclearity nanoclusters

By changing the substituent groups of mercapto-based ligands, polyoxoazocobaltate high-nuclearity nanoclusters have been synthesized and structurally characterized, and they display photocatalytic activities for degradation of organic dyes.

Design of chiral Co(ii)-MOFs and their application in environmental remediation and waste water treatment

The present work reports construction of Co-MOFs with amide based bispyrazole ligand and different carboxylic acids which have potential applications in CO₂ adsorption and photocatalytic waste water treatment.

Synthesis, structure and luminescence properties of two new acylamide metal-organic frameworks showing 4-connected CdSO₄ and a threefold interpenetrating dia net

Two new acylamide metal-organic frameworks (MOFs), based on mixed N- and O-donor ligands, with 4-connected topologies have been obtained, namely poly[[μ2-N(1),N(4)-bis(pyridin-3-yl)terephthalamide]bis(μ3-4,4'-oxydibenzoato)dizinc(II)], [Zn2(C14H8O5)2(C18H14N4O2)]n, (1), and poly[[(μ2-benzene-1,4-dicarboxylato)[μ2-N(4),N(4')-bis(pyridin-3-yl)-[1,1'-biphenyl]-4,4'-dicarboxamide]dicadmium(II)] dihydrate], {[Cd(C8H4O4)(C24H18N4O2)]·2H2O}n, (2). Complex (1) is a 4-connected CdSO4 net with no interpenetration, where the Zn(II) cation is regarded as a 4-connecting node with square geometry. Complex (2) is a 4-connected dia net with threefold interpenetration, where the Cd(II) cation acts as a 4-connecting node with tetrahedral geometry. The results of thermogravimetric and luminescence analyses are described in detail.

Polycarboxylate-directed various Co(ii) complexes based on a “V”-like bis-pyridyl-bis-amide derivative: construction, electrochemical and photocatalytic properties

Six Co(ii) complexes have been hydrothermally synthesized with mixed ligands. The effects of the polycarboxylates on the structures of the title complexes have been discussed.

Assembly of a series of d10 coordination polymers based on W-shaped 1,3-di(2′,4′-dicarboxyphenyl)benzene: from syntheses, structural diversity, luminescence, to photocatalytic properties

Six d¹⁰ coordination polymers with different architectures based on W-shaped 1,3-di(2′,4′-dicarboxyphenyl)benzene (H₄DDB) have been prepared. Their photoluminescence and photocatalytic properties were also investigated.

Aminopyridine derivatives controlled the assembly and various properties of Cu–BTC metal–organic frameworks

Three Cu(ii) MOFs based on three aminopyridine derivatives and 1,3,5-benzenetricarboxylic acid have been synthesized and characterized. The electrocatalytic and photocatalytic properties of complexes 1–3 have been investigated in detail.

Novel coordination polymers of Zn(ii) and Cd(ii) tuned by different aromatic polycarboxylates: synthesis, structures and photocatalytic properties

Six fascinating coordination polymers (CPs) showed good photocatalytic activities for the degradation of methylene blue (MB).

Synthesis, crystal structures, and luminescence properties of seven tripodal imidazole-based Zn/Cd(ii) coordination polymers induced by tricarboxylates

New structural patterns made from the “old-fashioned” ligand 1,3,5-tris(1-imidazolyl)benzene have been obtained using three asymmetric V-shaped tricarboxylate ligands together with different metals.

Syntheses, crystal structures, and optical properties of five metal complexes constructed from a V-shaped thiophene-containing ligand and different dicarboxylate ligands

Five new metal complexes constructed from the V-shaped ligand 2,8-di(1H-imidazol-1-yl)dibenzothiophene (DIDP) and different aromatic dicarboxylic acids have been synthesized and structurally characterized in detail. All these complexes show optical semiconductive properties.

Metal–organic frameworks MIL-88A hexagonal microrods as a new photocatalyst for efficient decolorization of methylene blue dye

Metal–organic framework MIL-88A displays an active MB dye degradation performance.

Structural variability, topological analysis and photocatalytic properties of neoteric Cd(ii) coordination polymers based on semirigid bis(thiazolylbenzimidazole) and different types of carboxylic acid linkers

Six interesting architectures with different structural and topological motifs have been obtained. 3, 4 and 6 exhibit good photocatalytic activities for methylene blue degradation.