Synthesis of Highly Branched Gold Nanodendrites with a Narrow Size Distribution and Tunable NIR and SERS Using a Multiamine Surfactant

Gold nanodendrites with a long and densely branched morphology were fabricated by a seed-mediated method in a solution containing gold nanoparticles (AuNPs), bis­(amidoethyl-carbamoylethyl)­octadecylamine (C18N3), HAuCl₄, and the reducing agent ascorbic acid (AA). The length and density of the branches could be mediated by changing the AuNP seed and AA concentrations. The amphiphilic C18N3 molecules function as a template and induce the unique morphology of the AuNPs/C18N3 structures. The localized surface plasmon resonance (LSPR) peaks of the gold nanodendrites can be modulated from the visible (∼530 nm) to the near-infrared region (∼1100 nm) of the electromagnetic spectrum. Surface-enhanced Raman scattering (SERS) signals using rhodamine can also be mediated by changing the seed and AA concentrations. These unique highly branched gold nanodendrites with a narrow size distribution and tunable NIR and SERS spectra should have great potential in sensing applications

A Three-Dimensional Dynamic Metal–Organic Framework with Fourfold Interpenetrating Diamondoid Networks and Selective Adsorption Properties

A three-dimensional metal–organic framework (<b>1</b>) with fourfold interpenetrating diamondoid networks was constructed using a macrocyclic nickel­(II) complex and a tetracarboxylic ligand 4,4′,4″,4‴-(cyclohexane-1,2-diyibis­(azanetriyl))­tetrakis­(methylene)­tetrabenzoic acid as building blocks. Despite the fourfold interpenetration, <b>1</b> possesses one-dimensional channels that are occupied by water and CH₃CN guest molecules. Once the guest molecules were removed, the framework and pores in desolvated <b>1</b> are dynamic with large adsorption hysteresis loops, which exhibit selective gas adsorption for CO₂ at 195 K over N₂ and H₂ at 77 K and selective adsorption for methanol, ethanol, and <i>n</i>-propanol over isopropanol at 298 K

Shape Homogenization and Long-Range Arrangement of Gold Nanorods Using a pH-Responsive Multiamine Surfactant

A relatively new and efficient method is reported here for the purification and arrangement of high-aspect-ratio gold nanorods (AuNRs) using a multiamine surfactant, bis­[[(amidoethyl)­carbamoyl]­ethyl]­octadecylamine (C18N3), which strongly adsorbs to the surface of AuNRs. The adsorbed layers of the multiamine surfactant on AuNRs exhibit the ability to deaggregate gold nanoparticles at low pH in an aqueous medium and to promote their aggregation at high pH. Through regulation of the pH of the dispersion medium, a well-ordered arrangement of 99% monodisperse AuNRs was obtained, having dimensions of approximately 18 nm diameter and 353 nm length and an area of several dozens of square micrometers, which is much larger than what has been reported in the literature. A very strong optical absorption in the near-infrared region of as-prepared AuNRs was shown. This strategy of using pH-responsive multiamine surfactant to mediate both the homogenization in shape and the arrangement of nanoparticles provides a new methodology for the formation of nanoparticle assemblies

A Three-Dimensional Dynamic Metal–Organic Framework with Fourfold Interpenetrating Diamondoid Networks and Selective Adsorption Properties

A three-dimensional metal–organic framework (<b>1</b>) with fourfold interpenetrating diamondoid networks was constructed using a macrocyclic nickel­(II) complex and a tetracarboxylic ligand 4,4′,4″,4‴-(cyclohexane-1,2-diyibis­(azanetriyl))­tetrakis­(methylene)­tetrabenzoic acid as building blocks. Despite the fourfold interpenetration, <b>1</b> possesses one-dimensional channels that are occupied by water and CH₃CN guest molecules. Once the guest molecules were removed, the framework and pores in desolvated <b>1</b> are dynamic with large adsorption hysteresis loops, which exhibit selective gas adsorption for CO₂ at 195 K over N₂ and H₂ at 77 K and selective adsorption for methanol, ethanol, and <i>n</i>-propanol over isopropanol at 298 K

Lanthanide Coordination Polymers Constructed from Imidazole-4,5-Dicarboxylate and Sulfate: Syntheses, Structural Diversity, and Photoluminescent Properties

Three series of lanthanide coordination polymers of {[Ln₂(HIDC)₂(SO₄)­(H₂O)₅]·H₂O}_<i>n</i> (CPs-<b>1Ln</b>, Ln = Sm, Eu, Tb, Dy, Ho, Er, and Yb), {(H₂prz)­[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i> (CPs-<b>2Ln</b>, Ln = Sm and Eu), and [Ln₂(HIDC)₂(SO₄)­(H₂O)₂]_<i>n</i> (CPs-<b>3Ln</b>, Ln = Tb, Dy, Ho, Er, and Yb) have been hydrothermally synthesized by the reactions of Ln­(NO₃)₃·6H₂O with imidazole-4,5-dicarboxylic acid (H₃IDC) and sulfuric acid (H₂SO₄) in the presence of piperazine (prz) at different temperatures. The results of the single-crystal X-ray diffraction analysis reveal that CPs-<b>1Ln</b> presents a three-dimensional (3D) architecture, in which alternating one-dimensional (1D) right-/left-handed helical chains of [Ln₂(HIDC)₂]_∞ are interlinked by μ₃-SO₄^2– anions. CPs-<b>2Ln</b> assumes a H₂prz²⁺ templated 3D anionic layer-pillared metal–organic framework (MOF) of {[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i>^2<i>n</i>–, in which two-dimensional (2D) (6,3) network layers of [Ln₂(HIDC)₂]_<i>n</i>^2<i>n</i>+ are pillared by μ₂-SO₄^2– anions. CPs-<b>3Ln</b> is a 2D layer structure, in which two 2D (6,3) monolayers of [Ln₂(HIDC)₂(H₂O)₂]_<i>n</i>^2<i>n+</i> are connected by μ₂-SO₄^2– anions to form a 2D double-layer structure. The adjacent 2D double-layers are further stacked together via strong hydrogen bonding interactions to generate a 3D supramolecular framework. In addition, the results of photoluminescent measurements for Sm (<b>1Sm</b> and <b>2Sm</b>), Eu (<b>1Eu</b> and <b>2Eu</b>), Tb (<b>1Tb</b> and <b>3Tb</b>), and Dy (<b>1Dy</b> and <b>3Dy</b>) compounds in the solid state at room temperature indicate that different structural types have a different influence on their characteristic photoluminescences

Green Antibacterial Nanocomposites from Poly(lactide)/Poly(butylene adipate-<i>co</i>-terephthalate)/Nanocrystal Cellulose–Silver Nanohybrids

Silver nanoparticles (AgNPs) with a diameter of 3–6 nm were uniformly reacted onto the surface of nanocrystal cellulose (NCC) via complexation leading to NCC–Ag nanohybrids with an AgNP content of 8 wt %. Subsequently, antibacterial green nanocomposites containing renewable and biodegradable poly­(lactide) (PLA), poly­(butylene adipate-<i>co</i>-terephthalate) (PBAT) and NCC–Ag nanohybrids were synthesized and investigated. The PBAT as flexibilizer improved the toughness of the PLA matrix while the uniformly dispersed NCC–Ag nanohybrids enhanced the compatibility, thermal stability, crystallization, and antibacterial properties of the PLA/PBAT blends. The crystallization rate and the storage modulus (<i>E</i>′) of the green nanocomposites were increased obviously with increasing content of CNC–Ag nanohybrids. Meanwhile, notably the antibacterial activity of the PLA/PBAT/NCC–Ag nanocomposites was achieved against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus cells. The antibacterial performance was mainly related to the antibacterial nature of the finely dispersed NCC–Ag nanohybrids. The study demonstrates great potential of the green nanocomposites in functional packaging and antibacterial textile applications

Lanthanide Coordination Polymers Constructed from Imidazole-4,5-Dicarboxylate and Sulfate: Syntheses, Structural Diversity, and Photoluminescent Properties

Three series of lanthanide coordination polymers of {[Ln₂(HIDC)₂(SO₄)­(H₂O)₅]·H₂O}_<i>n</i> (CPs-<b>1Ln</b>, Ln = Sm, Eu, Tb, Dy, Ho, Er, and Yb), {(H₂prz)­[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i> (CPs-<b>2Ln</b>, Ln = Sm and Eu), and [Ln₂(HIDC)₂(SO₄)­(H₂O)₂]_<i>n</i> (CPs-<b>3Ln</b>, Ln = Tb, Dy, Ho, Er, and Yb) have been hydrothermally synthesized by the reactions of Ln­(NO₃)₃·6H₂O with imidazole-4,5-dicarboxylic acid (H₃IDC) and sulfuric acid (H₂SO₄) in the presence of piperazine (prz) at different temperatures. The results of the single-crystal X-ray diffraction analysis reveal that CPs-<b>1Ln</b> presents a three-dimensional (3D) architecture, in which alternating one-dimensional (1D) right-/left-handed helical chains of [Ln₂(HIDC)₂]_∞ are interlinked by μ₃-SO₄^2– anions. CPs-<b>2Ln</b> assumes a H₂prz²⁺ templated 3D anionic layer-pillared metal–organic framework (MOF) of {[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i>^2<i>n</i>–, in which two-dimensional (2D) (6,3) network layers of [Ln₂(HIDC)₂]_<i>n</i>^2<i>n</i>+ are pillared by μ₂-SO₄^2– anions. CPs-<b>3Ln</b> is a 2D layer structure, in which two 2D (6,3) monolayers of [Ln₂(HIDC)₂(H₂O)₂]_<i>n</i>^2<i>n+</i> are connected by μ₂-SO₄^2– anions to form a 2D double-layer structure. The adjacent 2D double-layers are further stacked together via strong hydrogen bonding interactions to generate a 3D supramolecular framework. In addition, the results of photoluminescent measurements for Sm (<b>1Sm</b> and <b>2Sm</b>), Eu (<b>1Eu</b> and <b>2Eu</b>), Tb (<b>1Tb</b> and <b>3Tb</b>), and Dy (<b>1Dy</b> and <b>3Dy</b>) compounds in the solid state at room temperature indicate that different structural types have a different influence on their characteristic photoluminescences

Lanthanide Coordination Polymers Constructed from Imidazole-4,5-Dicarboxylate and Sulfate: Syntheses, Structural Diversity, and Photoluminescent Properties

Three series of lanthanide coordination polymers of {[Ln₂(HIDC)₂(SO₄)­(H₂O)₅]·H₂O}_<i>n</i> (CPs-<b>1Ln</b>, Ln = Sm, Eu, Tb, Dy, Ho, Er, and Yb), {(H₂prz)­[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i> (CPs-<b>2Ln</b>, Ln = Sm and Eu), and [Ln₂(HIDC)₂(SO₄)­(H₂O)₂]_<i>n</i> (CPs-<b>3Ln</b>, Ln = Tb, Dy, Ho, Er, and Yb) have been hydrothermally synthesized by the reactions of Ln­(NO₃)₃·6H₂O with imidazole-4,5-dicarboxylic acid (H₃IDC) and sulfuric acid (H₂SO₄) in the presence of piperazine (prz) at different temperatures. The results of the single-crystal X-ray diffraction analysis reveal that CPs-<b>1Ln</b> presents a three-dimensional (3D) architecture, in which alternating one-dimensional (1D) right-/left-handed helical chains of [Ln₂(HIDC)₂]_∞ are interlinked by μ₃-SO₄^2– anions. CPs-<b>2Ln</b> assumes a H₂prz²⁺ templated 3D anionic layer-pillared metal–organic framework (MOF) of {[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i>^2<i>n</i>–, in which two-dimensional (2D) (6,3) network layers of [Ln₂(HIDC)₂]_<i>n</i>^2<i>n</i>+ are pillared by μ₂-SO₄^2– anions. CPs-<b>3Ln</b> is a 2D layer structure, in which two 2D (6,3) monolayers of [Ln₂(HIDC)₂(H₂O)₂]_<i>n</i>^2<i>n+</i> are connected by μ₂-SO₄^2– anions to form a 2D double-layer structure. The adjacent 2D double-layers are further stacked together via strong hydrogen bonding interactions to generate a 3D supramolecular framework. In addition, the results of photoluminescent measurements for Sm (<b>1Sm</b> and <b>2Sm</b>), Eu (<b>1Eu</b> and <b>2Eu</b>), Tb (<b>1Tb</b> and <b>3Tb</b>), and Dy (<b>1Dy</b> and <b>3Dy</b>) compounds in the solid state at room temperature indicate that different structural types have a different influence on their characteristic photoluminescences

Lanthanide Coordination Polymers Constructed from Imidazole-4,5-Dicarboxylate and Sulfate: Syntheses, Structural Diversity, and Photoluminescent Properties

Three series of lanthanide coordination polymers of {[Ln₂(HIDC)₂(SO₄)­(H₂O)₅]·H₂O}_<i>n</i> (CPs-<b>1Ln</b>, Ln = Sm, Eu, Tb, Dy, Ho, Er, and Yb), {(H₂prz)­[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i> (CPs-<b>2Ln</b>, Ln = Sm and Eu), and [Ln₂(HIDC)₂(SO₄)­(H₂O)₂]_<i>n</i> (CPs-<b>3Ln</b>, Ln = Tb, Dy, Ho, Er, and Yb) have been hydrothermally synthesized by the reactions of Ln­(NO₃)₃·6H₂O with imidazole-4,5-dicarboxylic acid (H₃IDC) and sulfuric acid (H₂SO₄) in the presence of piperazine (prz) at different temperatures. The results of the single-crystal X-ray diffraction analysis reveal that CPs-<b>1Ln</b> presents a three-dimensional (3D) architecture, in which alternating one-dimensional (1D) right-/left-handed helical chains of [Ln₂(HIDC)₂]_∞ are interlinked by μ₃-SO₄^2– anions. CPs-<b>2Ln</b> assumes a H₂prz²⁺ templated 3D anionic layer-pillared metal–organic framework (MOF) of {[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i>^2<i>n</i>–, in which two-dimensional (2D) (6,3) network layers of [Ln₂(HIDC)₂]_<i>n</i>^2<i>n</i>+ are pillared by μ₂-SO₄^2– anions. CPs-<b>3Ln</b> is a 2D layer structure, in which two 2D (6,3) monolayers of [Ln₂(HIDC)₂(H₂O)₂]_<i>n</i>^2<i>n+</i> are connected by μ₂-SO₄^2– anions to form a 2D double-layer structure. The adjacent 2D double-layers are further stacked together via strong hydrogen bonding interactions to generate a 3D supramolecular framework. In addition, the results of photoluminescent measurements for Sm (<b>1Sm</b> and <b>2Sm</b>), Eu (<b>1Eu</b> and <b>2Eu</b>), Tb (<b>1Tb</b> and <b>3Tb</b>), and Dy (<b>1Dy</b> and <b>3Dy</b>) compounds in the solid state at room temperature indicate that different structural types have a different influence on their characteristic photoluminescences

Lanthanide Coordination Polymers Constructed from Imidazole-4,5-Dicarboxylate and Sulfate: Syntheses, Structural Diversity, and Photoluminescent Properties

Three series of lanthanide coordination polymers of {[Ln₂(HIDC)₂(SO₄)­(H₂O)₅]·H₂O}_<i>n</i> (CPs-<b>1Ln</b>, Ln = Sm, Eu, Tb, Dy, Ho, Er, and Yb), {(H₂prz)­[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i> (CPs-<b>2Ln</b>, Ln = Sm and Eu), and [Ln₂(HIDC)₂(SO₄)­(H₂O)₂]_<i>n</i> (CPs-<b>3Ln</b>, Ln = Tb, Dy, Ho, Er, and Yb) have been hydrothermally synthesized by the reactions of Ln­(NO₃)₃·6H₂O with imidazole-4,5-dicarboxylic acid (H₃IDC) and sulfuric acid (H₂SO₄) in the presence of piperazine (prz) at different temperatures. The results of the single-crystal X-ray diffraction analysis reveal that CPs-<b>1Ln</b> presents a three-dimensional (3D) architecture, in which alternating one-dimensional (1D) right-/left-handed helical chains of [Ln₂(HIDC)₂]_∞ are interlinked by μ₃-SO₄^2– anions. CPs-<b>2Ln</b> assumes a H₂prz²⁺ templated 3D anionic layer-pillared metal–organic framework (MOF) of {[Ln₂(HIDC)₂(SO₄)₂]}_<i>n</i>^2<i>n</i>–, in which two-dimensional (2D) (6,3) network layers of [Ln₂(HIDC)₂]_<i>n</i>^2<i>n</i>+ are pillared by μ₂-SO₄^2– anions. CPs-<b>3Ln</b> is a 2D layer structure, in which two 2D (6,3) monolayers of [Ln₂(HIDC)₂(H₂O)₂]_<i>n</i>^2<i>n+</i> are connected by μ₂-SO₄^2– anions to form a 2D double-layer structure. The adjacent 2D double-layers are further stacked together via strong hydrogen bonding interactions to generate a 3D supramolecular framework. In addition, the results of photoluminescent measurements for Sm (<b>1Sm</b> and <b>2Sm</b>), Eu (<b>1Eu</b> and <b>2Eu</b>), Tb (<b>1Tb</b> and <b>3Tb</b>), and Dy (<b>1Dy</b> and <b>3Dy</b>) compounds in the solid state at room temperature indicate that different structural types have a different influence on their characteristic photoluminescences