An Unusual Independent 1D Metal−Organic Nanotube with Mesohelical Structure and 1D → 2D Interdigitation

A novel one-dimensional (1D) metal−organic nanotube {[Cd2(ADC)2(bpp)3(H2O)]2·8H2O}n (MONT-1), based on mixed organic ligands, has been synthesized and characterized. MONT-1 presents the first independent 1D metal−organic nanotube with mesohelical structure and a fascinating topology of 1D → 2D interdigital architecture with side arms. This compound also exhibits high thermal stability and blue-shift emission with large intensity enhancement compared with that of the free ligand and can be explored for potential blue luminescent materials

An Unusual Independent 1D Metal−Organic Nanotube with Mesohelical Structure and 1D → 2D Interdigitation

A novel one-dimensional (1D) metal−organic nanotube {[Cd2(ADC)2(bpp)3(H2O)]2·8H2O}n (MONT-1), based on mixed organic ligands, has been synthesized and characterized. MONT-1 presents the first independent 1D metal−organic nanotube with mesohelical structure and a fascinating topology of 1D → 2D interdigital architecture with side arms. This compound also exhibits high thermal stability and blue-shift emission with large intensity enhancement compared with that of the free ligand and can be explored for potential blue luminescent materials

Formation of Three New Silver(I) Coordination Polymers Involving 1,2-Phenylenediacetic Acid via the Modulation of Dipyridyl-Containing Ligands

Three new silver(I) metal−organic frameworks (MOFs), namely, [Ag2(pda)(bipy)2]n·4nH2O (1), [Ag2(pda)(dpe)2(H2O)]n·4nH2O (2), and [Ag(Hpda)(bpp)]n (3), were prepared by hydrothermal reactions of silver(I) acetate with H2pda (H2pda = 1,2-phenylenediacetic acid) in the presence of different pyridyl-containing ligands (bipy = 4,4′-bipyridine, dpe = 1,2-di(4-pyridyl)-ethylene, and bpp = 1,2-bis(4-pyridyl)propane) and structurally characterized by single crystal X-ray diffraction. Complex 1 shows a two-dimensional (2D) four-connected network with a long topological vertex Schläfli symbol (4.62.4.63.64.6). Of particular interest, a new unreported octameric water cluster, (H2O)8, which is comprised of a cyclic water tetramer and four dangling water monomers, exists in 1. And the pseudorotaxane motifs are formed by these octameric clusters and the [Ag8(pda)2(bipy)4] loops. Complex 2 features a one-dimensional (1D) ladder-like chain structure, and the 2D networks, assembling by the combination of the pentameric water cluster, (H2O)5, and pda dianions, are supported by the 1D polymeric chains to form an infinite three-dimensional (3D) supramolecular framework. Complex 3 is a highly puckered 2D (6,3) sheet and further stacks via hydrogen bonding interlocks notated as R22 (18) to afford a unique 3D 66 topology with a long topological vertex Schläfli symbol of (6.62.6.62.6.62) but which is not a typical diamondoid network. The diverse arrangements of the complexes show the remarkable sensitivity of the AgI−H2pda system to the different dipyridyl ligands; that is to say, the subtle modulation of dipyridyl-containing ligand has a significant effect on the overall MOFs and the coordination modes of H2pda ligands. In addition, the properties of thermogravimetric analysis−differential scanning calorimetry, X-ray powder diffraction, and photoluminescent behaviors of the complexes have been also discussed

Formation of Three New Silver(I) Coordination Polymers Involving 1,2-Phenylenediacetic Acid via the Modulation of Dipyridyl-Containing Ligands

Three new silver(I) metal−organic frameworks (MOFs), namely, [Ag2(pda)(bipy)2]n·4nH2O (1), [Ag2(pda)(dpe)2(H2O)]n·4nH2O (2), and [Ag(Hpda)(bpp)]n (3), were prepared by hydrothermal reactions of silver(I) acetate with H2pda (H2pda = 1,2-phenylenediacetic acid) in the presence of different pyridyl-containing ligands (bipy = 4,4′-bipyridine, dpe = 1,2-di(4-pyridyl)-ethylene, and bpp = 1,2-bis(4-pyridyl)propane) and structurally characterized by single crystal X-ray diffraction. Complex 1 shows a two-dimensional (2D) four-connected network with a long topological vertex Schläfli symbol (4.62.4.63.64.6). Of particular interest, a new unreported octameric water cluster, (H2O)8, which is comprised of a cyclic water tetramer and four dangling water monomers, exists in 1. And the pseudorotaxane motifs are formed by these octameric clusters and the [Ag8(pda)2(bipy)4] loops. Complex 2 features a one-dimensional (1D) ladder-like chain structure, and the 2D networks, assembling by the combination of the pentameric water cluster, (H2O)5, and pda dianions, are supported by the 1D polymeric chains to form an infinite three-dimensional (3D) supramolecular framework. Complex 3 is a highly puckered 2D (6,3) sheet and further stacks via hydrogen bonding interlocks notated as R22 (18) to afford a unique 3D 66 topology with a long topological vertex Schläfli symbol of (6.62.6.62.6.62) but which is not a typical diamondoid network. The diverse arrangements of the complexes show the remarkable sensitivity of the AgI−H2pda system to the different dipyridyl ligands; that is to say, the subtle modulation of dipyridyl-containing ligand has a significant effect on the overall MOFs and the coordination modes of H2pda ligands. In addition, the properties of thermogravimetric analysis−differential scanning calorimetry, X-ray powder diffraction, and photoluminescent behaviors of the complexes have been also discussed

Formation of Three New Silver(I) Coordination Polymers Involving 1,2-Phenylenediacetic Acid via the Modulation of Dipyridyl-Containing Ligands

Three new silver(I) metal−organic frameworks (MOFs), namely, [Ag2(pda)(bipy)2]n·4nH2O (1), [Ag2(pda)(dpe)2(H2O)]n·4nH2O (2), and [Ag(Hpda)(bpp)]n (3), were prepared by hydrothermal reactions of silver(I) acetate with H2pda (H2pda = 1,2-phenylenediacetic acid) in the presence of different pyridyl-containing ligands (bipy = 4,4′-bipyridine, dpe = 1,2-di(4-pyridyl)-ethylene, and bpp = 1,2-bis(4-pyridyl)propane) and structurally characterized by single crystal X-ray diffraction. Complex 1 shows a two-dimensional (2D) four-connected network with a long topological vertex Schläfli symbol (4.62.4.63.64.6). Of particular interest, a new unreported octameric water cluster, (H2O)8, which is comprised of a cyclic water tetramer and four dangling water monomers, exists in 1. And the pseudorotaxane motifs are formed by these octameric clusters and the [Ag8(pda)2(bipy)4] loops. Complex 2 features a one-dimensional (1D) ladder-like chain structure, and the 2D networks, assembling by the combination of the pentameric water cluster, (H2O)5, and pda dianions, are supported by the 1D polymeric chains to form an infinite three-dimensional (3D) supramolecular framework. Complex 3 is a highly puckered 2D (6,3) sheet and further stacks via hydrogen bonding interlocks notated as R22 (18) to afford a unique 3D 66 topology with a long topological vertex Schläfli symbol of (6.62.6.62.6.62) but which is not a typical diamondoid network. The diverse arrangements of the complexes show the remarkable sensitivity of the AgI−H2pda system to the different dipyridyl ligands; that is to say, the subtle modulation of dipyridyl-containing ligand has a significant effect on the overall MOFs and the coordination modes of H2pda ligands. In addition, the properties of thermogravimetric analysis−differential scanning calorimetry, X-ray powder diffraction, and photoluminescent behaviors of the complexes have been also discussed

Formation of Three New Silver(I) Coordination Polymers Involving 1,2-Phenylenediacetic Acid via the Modulation of Dipyridyl-Containing Ligands

Three new silver(I) metal−organic frameworks (MOFs), namely, [Ag2(pda)(bipy)2]n·4nH2O (1), [Ag2(pda)(dpe)2(H2O)]n·4nH2O (2), and [Ag(Hpda)(bpp)]n (3), were prepared by hydrothermal reactions of silver(I) acetate with H2pda (H2pda = 1,2-phenylenediacetic acid) in the presence of different pyridyl-containing ligands (bipy = 4,4′-bipyridine, dpe = 1,2-di(4-pyridyl)-ethylene, and bpp = 1,2-bis(4-pyridyl)propane) and structurally characterized by single crystal X-ray diffraction. Complex 1 shows a two-dimensional (2D) four-connected network with a long topological vertex Schläfli symbol (4.62.4.63.64.6). Of particular interest, a new unreported octameric water cluster, (H2O)8, which is comprised of a cyclic water tetramer and four dangling water monomers, exists in 1. And the pseudorotaxane motifs are formed by these octameric clusters and the [Ag8(pda)2(bipy)4] loops. Complex 2 features a one-dimensional (1D) ladder-like chain structure, and the 2D networks, assembling by the combination of the pentameric water cluster, (H2O)5, and pda dianions, are supported by the 1D polymeric chains to form an infinite three-dimensional (3D) supramolecular framework. Complex 3 is a highly puckered 2D (6,3) sheet and further stacks via hydrogen bonding interlocks notated as R22 (18) to afford a unique 3D 66 topology with a long topological vertex Schläfli symbol of (6.62.6.62.6.62) but which is not a typical diamondoid network. The diverse arrangements of the complexes show the remarkable sensitivity of the AgI−H2pda system to the different dipyridyl ligands; that is to say, the subtle modulation of dipyridyl-containing ligand has a significant effect on the overall MOFs and the coordination modes of H2pda ligands. In addition, the properties of thermogravimetric analysis−differential scanning calorimetry, X-ray powder diffraction, and photoluminescent behaviors of the complexes have been also discussed

Interaction of 1,3-Adamantanediacetic Acid (H₂ADA) and Ditopic Pyridyl Subunits with Cobalt Nitrate under Hydrothermal Conditions: pH Influence, Crystal Structures, and Their Properties

A systematic investigation of the pH influence on the interaction between 1,3-adamantanediacetic acid (H2ADA), 1,3-bis(4-pyridyl)propane (bpp)/4,4′-dipyridine (4,4′-bipy), and cobalt nitrate under hydrothermal conditions has resulted in a series of coordination polymers with different composition and dimensionality, namely [Co(HADA)2(bpp)]n (1), {[Co(ADA)(bpp)(CH3OH)]·H2O}n (2), [Co2(ADA)2(bpp)]n (3), [Co(HADA)2(4,4′-bipy)(H2O)2]n (4), and [Co(ADA)(4,4′-bipy)0.5]n (5). These neutral polymeric complexes exhibit structural and dimensional diversity due to various coordination modes of the flexible H2ADA ligand. X-ray structural analysis reveals that 1 and 4 are one-dimensional (1-D) chains. The chain of complex 1 is directed by bpp, in which HADA located at both sides of the chain. Compared with the case of 1, the 1-D linear chain is composed of 4,4′-bipy and Co(II) ions in 4. Complexes 2, 3, and 5 show different 2-D networks. In 2, the final structure is formed via the linkage of Co-bpp chains by ADA. Complex 3 is composed of 1-D looped chains in which there are two kinds of [Co2ADA2] metallomacrocycles, and the chains are further connected by bpp to form the 2-D structure. The building block represents a one-dimensional chain consisting of [Co2ADA2] units linked by 4,4′-bipy in 5. Five new coordination modes of H2ADA are observed; among them, the bridging modes have proven that H2ADA can be used as an effective bridging ligand for metal−organic complexes, especially for metal organic layered structures (MOLS). It has also been found that the structure formation of the complexes is mainly governed by the pH value of the solution. The other effect is probably the flexibility of the pyridyl-containing ligands optimizing their position within the complexes. The TG, XRPD data of synthesized complexes and the magnetic properties for 3 and 5 have also been investigated

A Rare L1D + R1D → 3D Luminescent Dense Polymer as Multifunctional Sensor to Nitro Aromatic Compounds, Cu²⁺, and Bases

A rarely reported L1D (left-handed helical 1D chain) + R1D (right-handed helical 1D chain) → 3D polycatenated network, [Cd­(H₂ttac)­bpp]_<i>n</i> (<b>1</b>), constructed from the vertical interpenetration of triple-stranded homochiral helices, has been synthesized under hydrothermal condition by H₄ttac (1,1′,2′,1″-terphenyl-4,4′,4″,5′-tetracarboxylic acid), 1,3-bis­(4-pyridyl)­propane (bpp), and Cd­(NO₃)₂·4H₂O. The luminescent properties of <b>1</b> and the ones immersed in various kinds of organic compounds and nitrate@DMF solutions have been investigated. Importantly, <b>1</b> shows highly sensitive response to nitro aromatic compounds and Cu²⁺ through luminescence quenching effects, making it a promising luminescent sensor for nitro aromatic compounds and Cu²⁺. Besides, experiments upon deprotonation by NaOH, KOH, methylamine, and triethylamine are conducted, respectively. As base increases, the luminescence spectra exhibit gradual blue shifts. The mechanisms of the sensing properties have been studied in detail

Interaction of 1,3-Adamantanediacetic Acid (H₂ADA) and Ditopic Pyridyl Subunits with Cobalt Nitrate under Hydrothermal Conditions: pH Influence, Crystal Structures, and Their Properties

A systematic investigation of the pH influence on the interaction between 1,3-adamantanediacetic acid (H2ADA), 1,3-bis(4-pyridyl)propane (bpp)/4,4′-dipyridine (4,4′-bipy), and cobalt nitrate under hydrothermal conditions has resulted in a series of coordination polymers with different composition and dimensionality, namely [Co(HADA)2(bpp)]n (1), {[Co(ADA)(bpp)(CH3OH)]·H2O}n (2), [Co2(ADA)2(bpp)]n (3), [Co(HADA)2(4,4′-bipy)(H2O)2]n (4), and [Co(ADA)(4,4′-bipy)0.5]n (5). These neutral polymeric complexes exhibit structural and dimensional diversity due to various coordination modes of the flexible H2ADA ligand. X-ray structural analysis reveals that 1 and 4 are one-dimensional (1-D) chains. The chain of complex 1 is directed by bpp, in which HADA located at both sides of the chain. Compared with the case of 1, the 1-D linear chain is composed of 4,4′-bipy and Co(II) ions in 4. Complexes 2, 3, and 5 show different 2-D networks. In 2, the final structure is formed via the linkage of Co-bpp chains by ADA. Complex 3 is composed of 1-D looped chains in which there are two kinds of [Co2ADA2] metallomacrocycles, and the chains are further connected by bpp to form the 2-D structure. The building block represents a one-dimensional chain consisting of [Co2ADA2] units linked by 4,4′-bipy in 5. Five new coordination modes of H2ADA are observed; among them, the bridging modes have proven that H2ADA can be used as an effective bridging ligand for metal−organic complexes, especially for metal organic layered structures (MOLS). It has also been found that the structure formation of the complexes is mainly governed by the pH value of the solution. The other effect is probably the flexibility of the pyridyl-containing ligands optimizing their position within the complexes. The TG, XRPD data of synthesized complexes and the magnetic properties for 3 and 5 have also been investigated

Two Isostructural Metal–Organic Frameworks Directed by the Different Center Metal Ions, Exhibiting the Ferrimagnetic Behavior and Slow Magnetic Relaxation

Two 3D isostructural metal–organic frameworks with 1D ferrimagnetic chains, formulated as [M₃(L)­(μ₃-OH)₂(H₂O)₄] [H₄L = (1,1′:4′,1″-terphenyl)-2′,3,3″,5′-tetracarboxylic acid, where M = Mn for <b>1</b> and Co for <b>2</b>], have been successfully synthesized by employing different center metal ions and a multicarboxylate ligand under identical reaction conditions in this work. The single-crystal X-ray diffraction data of <b>1</b> and <b>2</b> reveal that the complexes are two 3D isostructural frameworks based on 1D [M₃(OH)₂]_<i>n</i> chains composed of triangular subunits as rod-shaped secondary building units, which are classified as binodal 4,6-connected fry nets with the point symbol (5¹⁰·6³·7⁸)­(5⁴·6²). The magnetic properties revealed that complexes <b>1</b> and <b>2</b> exhibit ferrimagnetic behavior. Also, the alternating-current susceptibility of <b>2</b> displays slow magnetic relaxation, showing interesting magnetic behavior of a single-chain magnet with an effective energy barrier of 32 K