Kinds Of Organic Ligands Research Articles

Deep learning-based simultaneous bioavailability assessment and speciation analysis of dissolved organic copper

Algal copper uptake (i.e., Cu bioavailability) in the euphotic zone plays a vital role in algal photosynthesis and respiration, affecting the primary productivity and the source and sink of atmospheric carbon. Algal Cu uptake is controlled by natural dissolved organic Cu (DOCu) speciation (i.e., complexed with the dissolved organic matter) that conventionally could be tested by model prediction or molecular-level characterizations in the lab, while DOCu uptake are hardly directly assessed. Thus, the new chemistry-biology insight into the mechanisms of the Cu uptake process in algae is urgent. The DOCu speciation transformation (organic DOCu to free Cu(II) ions), enzymatic reduction-induced valence change (reduction of free Cu(II) to Cu(I) ions), and algal Cu uptake at the algae-water interface are imitated. Herein, an intelligent system with DOCu colorimetric sensor is developed for real-time monitoring of newly generated Cu(I) ions. Deep learning with whole sample image-based characterization and powerful feature extraction capabilities facilitates colorimetric measurement. In this context, the Cu bioavailability with 7 kinds of organic ligands (e.g., amino acids, organic acids, carbohydrates) can be predicted by the mimetic intelligent biosensor within 15.0 min i.e., the DOCu uptake and speciation is successfully predicted and streamlined by the biomimetic approach.

Imidazole Multi-Carboxylate-Based 2D Cd(II) MOF: Preparation, Crystal Structure, and Properties

By adopting one imidazole multi-carboxylate ligand, 2-(3-carboxylphenyl)-1H-imidazole-4,5-dicarboxylic acid (m-CPhH4IDC) and one N-containg ligand, 2,2′-bipyridine (2,2′-Bipy) to react with Cd(NO3)2, under solvothermal condition, a two-dimensional metal-organic framework, {[Cd6(m-CPhHIDC)4(2,2′-Bipy)6] · 4H2O}n (I) has been sucessfully constructed. The structure has been determined by single-crystal X-ray diffraction analysis (CIF files CCDC no. 1480230) and further characterized by elemental analyses, IR spectra, and thermogravimetric analysis. MOF I exhibits a rare (3,4)-connected 2D structure bearing two kinds of organic ligands. According to the crystal data, the coordination ability and mode of the imidazole multi-carboxylate ligand are discussed. Furthermore, the thermal stability and solid-state photoluminescent properties of MOF I have been investigated.

High-Performance Electromagnetic Wave Absorbers Based on Two Kinds of Nickel-Based MOF-Derived Ni@C Microspheres.

Metal-organic framework (MOF)-derived composites on the microwave absorption have received extensive attention. However, which kind of organic ligand corresponding MOF derivative has better electromagnetic wave absorption performance is an urgent problem to be solved. In this work, two kinds of Ni@C derived from the Ni-based MOFs with two kinds of organic ligands (dimethylimidazole as a ligand named as Ni-ZIF and trimesic acid as a ligand named as Ni-BTC) were successfully obtained. The compositions, morphologies, and electromagnetic properties of two composites were well controlled. As a result, both kinds of Ni@C exhibited the good microwave absorption properties. Comparatively speaking, the Ni@C derived from Ni-ZIF performs better. The Ni@C-ZIF microspheres with a 40% mass filling ratio exhibited a strong reflection loss of -86.8 dB at 13.2 GHz when the matching thickness was 2.7 mm, and the corresponding effective absorption bandwidth was 7.4 GHz (4-11.4 GHz) with the thickness ranging from 1.5 to 4.0 mm. The impedance matching, multiple reflection, and interfacial polarization among Ni and C were beneficial to the enhancement of microwave attenuation, which N-doping introduced by nitrogen-containing ligands leads to excellent microwave absorption properties. Therefore, this work can give insights into understanding the absorbing mechanism as well as provide a simple and flexible paradigm for the design and synthesis of the absorber with the tunable and high-efficiency performances.

Syntheses, crystal structures, and properties of two supramolecules based on methoxyphenyl imidazole dicarboxylates

Two cobalt(II) and cadmium(II) complexes, [Co(H2DMOPhIDC)2(H2O)2] • 2H2O (H3DMOPhIDC = 2-(3,4-dimethoxyphenyl)-1H-imidazole-4,5-dicarboxylic acid) (I), [Cd(H2MOPhIDC)2-(Phen)] • C2H5OH (H3MOPhIDC = 2-(3-dimethoxyphenyl)-1H-imidazole-4,5-dicarboxylic acid, Phen = 1,10-phenanthroline) (II), have been hydro(solvo)thermally synthesized by employing two kinds of organic ligands, H3DMOPhIDC or H3MOPhIDC, respectively. The molecular structures of I and II have been characterized by IR spectra, elemental analyses and single-crystal X-ray diffraction (CIF files CCDC nos. 935845 (I), 935846 (II)). Both complexes show three-dimensional supramolecular structures supported by intermolecular H-bonds. Furthermore, the thermogravimetric and photoluminescent properties of two complexes have been investigated as well.

Lanthanide Complex Hybrid System for Fluorescent Sensing as Thermometer

AbstractA mixed lanthanide complex was synthesized hydrothermally with two kinds of organic ligands, adenine and biphenyl‐4,4′‐dicarboxylic acid, and is formulated as Ad/Tb0.999Eu0.001/BPDC (Ad = adeninate, BPDC = biphenyl‐4,4′‐dicarboxylate). The photophysical properties, especially the fluorescent sensing properties, have been studied in detail and compared to those of Tb0.999Eu0.001/BPDC, with a single ligand. It can be used as a ratiometric luminescent thermometer on the basis of the energy transfer from Tb3+ to Eu3+, whose color will change from green–yellow to red from 100 K to 300 K.

Amino Acid Functionalization of {Ni6PW9}-Based Clusters Under Hydrothermal Conditions

Two novel hexa-nickel(II)-substituted Keggin-type {Ni6PW9}-based tungstophosphates [Ni6(μ 3-Tris)(en)3(Pr)(damp)(H2O)2(B-α-PW9O34)]·10H2O (1) and [Ni6(μ 3-Tris)(en)3(damp)2(H2O)2(B-α-PW9O34)]·7H2O (2) (en = ethylenediamine, Pr = CH3CH2COO−, damp = 2-aminoisobutyrate, Tris = pentaerythritol) were hydrothermally synthesized and characterized by IR spectra, elemental analyses, powder X-ray diffraction, thermogravimetric analyses, and single-crystal X-ray diffraction. Crystal data for 1: orthorhombic, Pca21, a = 21.6962(7) A, b = 20.6398(5) A, c = 14.7825(4) A, β = 90o, V = 6619.7(3) A3, Z = 4; for 2: orthorhombic, Pca21, a = 21.6978(9) A, b = 20.6658(7) A, c = 14.7767(4) A, β = 90o, V = 6625.9(4) A3, Z = 4. 1 consists of a {Ni6(μ 3-Tris)(en)3(Pr)(damp)(H2O)2}9+ core and a [B-α-PW9O34]9− (PW9) unit and is covalently functionalized by one Pr and one damp, as well as en and Tris ligands. The structure of 2 is the same to 1 except that the Pr anion in 1 is substituted by the other damp ligand. Most interestingly, 1 contains four kinds of organic ligands, while 2 includes three kinds of organic ligands, which are first observed in polyoxometalate chemistry.

Synthesis, Crystal Structure, and Luminescent Properties of a Novel Cadmium Coordination Polymer

A novel cadmium metal-organic coordination polymer, namely Cd(atda)(3-abpt)(H2O)·2H2O (H2atda = (4-amino-1,2,4-triazole-3,5-diyldithio) diacetic acid, 3-abpt = 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole)), has been obtained under hydrothermal conditions by the reaction of cadmium salts with two kinds of organic ligands, characterized by single-crystal X-ray diffraction analysis, elemental analysis, and thermogravimetric analysis. Structural analysis reveals that complex possesses a 2D honeycomb network. Additionally, the complex show strong fluorescence in solid state at room temperature.

Synthesis, crystal structure and magnetic properties of a new 3D coordination polymer constructed by Co(II) with pyridine-3,4-dicarboxylate and 4,4’-bipyridine

A metal-organic framework, [Co2(pydc)2(bpy)2]n · 2nH2O (1) (H2pydc = pyridine-3,4-dicarboxylic acid, bpy = 4,4′-bipyridine), was synthesized under hydrothermal conditions. X-ray diffraction experiments reveal that (1) exhibits a chiral 3D metal-organic framework, which represents the rare example of 3D chiral coordination polymers containing two kinds of organic ligands. Temperature-dependent magnetic susceptibility for (1) was also studied.

Ligand-dependent particle size control of PbSe quantum dots

Colloidal solutions of monodisperse PbSe quantum dots (QDs) were synthesized by a hot solution chemical method from a reaction mixture of lead oleate and TOPSe (TOP: tri- n-octylphosphine). The synthesis was carried out at a fixed temperature (170 °C) and time, while the particle sizes of the PbSe QDs were controlled by using two different kinds of organic ligands with varied chain length. It was seen that the tuning of PbSe QDs are possible by using the proper molar ratio of the co-ligands, such as acetic acid or hexanoic acid, at a fixed reaction temperature and time, verified by TEM and XRD as well as NIR absorption analysis. The effects of different organic acids were studied and the role of additional organic acids might be due to the extent of ligand exchange efficiency between the Pb oleate and acetic/hexanoic acid in the initial stage, which is caused by the steric hindrance effects of the acids.

Zigzag on a zigzag: Trap of hydrogen-bonded water molecules in a luminescent metal–organic network

A four-connected 2-D metal–organic coordination polymer {[Cd(mpdc)(phen)] · H 2O}(mpdc = 2,6-dimethylpyridine-3,5-dicarboxylate, phen = 1,10-phenanthroline) has been assemblied from cadmium ions and two kinds of organic ligands under hydrothermal conditions, characterized by single-crystal X-ray diffraction analysis. The 2-D metal–organic network was constructed from binuclear [Cd(O 5N 2)] 2 clusters bridged by mpdc 2− ligands. The most interesting is that water molecules trapped by the 2-D network look as if its motif is projected from the zigzag arrangement of cadmium atoms in the 2-D network via hydrogen bonding interactions. In addition, new compound exhibits strong luminescence at λ max = 525 nm upon excitation at 367 nm.

A novel chiral coordination polymer with a two-dimensional undulated (6,4)-network: [Co4(2,2′-bipy)4(H2O)2(btec)2]n(btec = 1,2,4,5-benzenetetracarboxylate)

The novel coordination polymer [Co4(2,2′-bipy)4(H2O)2(btec)2]n (btec = 1,2,4,5-benzenetetracarboxylate), 1, has been hydrothermally synthesized. X-Ray diffraction experiments reveal that 1 exhibits an interesting two-dimensional (2D) chiral undulated (6,4)-network, which represents the first example of a 2D chiral coordination polymer containing two kinds of organic ligands. The value of the Flack parameter, x = 0.52(2), shows that the crystal of 1 is an inversion twin containing approximately 50% of the right-handed and 50% of the left-handed crystal structure and the whole compound is a racemate. Variable temperature magnetic susceptibility indicates that antiferromagnetic interactions exist between metallic Co(II) centers in 1.