A neodymium tetra(4-sulfonatophenyl)porphyrin with a flexible three-dimensional framework

2018 ◽  
Vol 22 (04) ◽  
pp. 325-330 ◽  
Author(s):  
Rong-Hua Hu ◽  
Cai Yi ◽  
Yao Li ◽  
Zhuan-Xia Zhang ◽  
Long-Zhen Lin ◽  
...  
Keyword(s):  
Diffuse Reflectance ◽  
Optical Band Gap ◽  
Reflectance Spectrum ◽  
Magnetic Measurements ◽  
Variable Temperature ◽  
Diffuse Reflectance Spectrum ◽  
Three Dimensional ◽  
Solvothermal Reaction ◽  
Single Crystal Diffraction ◽  
X Ray

A novel neodymium porphyrin [Nd(TPPS)][Formula: see text]•[Formula: see text]H[Formula: see text]O (1) [H[Formula: see text]TPPS [Formula: see text] tetra(4-sulfonatophenyl)porphyrin] has been prepared through a solvothermal reaction and characterized by the X-ray single-crystal diffraction technique. Complex 1is crystallized in the [Formula: see text]4/mcc space group of the tetragonal system. Complex 1 features a three-dimensional (3D) open framework with the pore size of the channels being of 6.9 [Formula: see text] × 8.2 [Formula: see text]. A wide optical band gap of 4.98 eV is revealed by the solid-state UV/vis diffuse reflectance spectrum. The variable-temperature magnetic susceptibility obeys the Curie-Weiss law ([Formula: see text]/([Formula: see text] with [Formula: see text] 0.67 K and a negative Weiss constant [Formula: see text] -0.37 K as found by the magnetic measurements, suggesting the existence of an antiferromagnetic behavior. The N[Formula: see text] adsorption and desorption curves show good reversibility and verify that the 3-D framework is flexible and can be compressed with the increasing pressure.

Synthesis, structure, photoluminescent, optical and magnetic properties of a novel thulium p-hydroxybenzenesulfonate complex

2019 ◽  
Vol 234 (3) ◽  
pp. 177-182
Author(s):  
Rong-Hua Hu ◽  
Wen-Tong Chen ◽  
Jian-gen Huang
Keyword(s):  
Magnetic Susceptibility ◽  
Solid State ◽  
Diffuse Reflectance ◽  
Magnetic Measurements ◽  
Variable Temperature ◽  
X Ray Diffraction ◽  
Monoclinic System ◽  
X Ray ◽  
Elemental Analyses ◽  
Anti Stokes

Abstract A novel thulium p-hydroxybenzenesulfonate complex [Tm(C6H5O4S)2(H2O)6](C6H5O4S)·3H2O (1) was solvothermally synthesized and characterized by elemental analyses, photoluminescence, solid-state UV/vis diffuse reflectance, magnetic measurements and single-crystal X-ray diffraction. Complex 1 features an ionic structure with the thulium ion possessing a square antiprismatic geometry. Complex 1 crystallized in the monoclinic system with space group P21. Photoluminescent measurements with solid-state sample demonstrate that the anti-Stokes emission bands in the red/NIR spectral region 710 and 812 nm are observed from the Tm3+ 4f intrashell transitions from the 3F2,3 excited states to the 3H6 and 1G4 excited state to the 3H5 state, respectively. Solid-state UV/vis diffuse reflectance spectra of complex 1 show the existence of a wide optical band gap of 3.56 eV. Variable-temperature magnetic susceptibility and field dependence magnetization measurements are also studied and the magnetic susceptibility obeys the Curie-Weiss law (χm=c/(T−θ)) with the value C being of 8.6 K and a negative Weiss constant θ being of −0.2 K.

One new copper iodide coordination polymer directed by 4-pyridyl dithioether ligand: Syntheses, structures, and photocatalysis

2020 ◽  
Vol 19 (3) ◽  
pp. 217-225
Author(s):  
Gui-Ying Qiao ◽  
Su-Min Li ◽  
Yun-Yin Niu
Keyword(s):  
Diffuse Reflectance ◽  
Reflectance Spectrum ◽  
Diffuse Reflectance Spectrum ◽  
Monoclinic Space Group ◽  
Copper Iodide ◽  
Tetrahedral Configuration ◽  
X Ray ◽  
Uv Visible ◽  
Dithioether Ligand ◽  
Visible Diffuse Reflectance Spectrum

One new compound consisting of 1,1-bis(4-pyridylthio)methylene ([Bpytm]) ligand, namely [Bpytm]CuI (1), has been prepared and characterized by IR spectroscopy, solid Uv-visible diffuse reflectance spectrum, and X-ray Powder Diffraction (PXRD). Compound 1 is a 2D MOF and ligand [Bpytm] coordinate with metal ions to form tetrahedral configuration. For compound 1: Crystal system: Monoclinic, Space group: C2/c, a = 13.6671(11), b = 11.6075(11), c = 17.1225(12), α= 90°, β= 93.707(3)°, γ= 90°, V = 2710.6(4) Å3, Z = 8, Dcalc = 2.082 g cm–3. The photocatalytic properties and thermal stability have been researched.

A novel tetrazolate- and cyanide-bridged three-dimensional heterometallic coordination polymer: crystal structure, thermal stability and magnetic properties

2017 ◽  
Vol 73 (11) ◽  
pp. 968-974 ◽  
Author(s):  
Ying-Lian Qin ◽  
Jian-Fang Qin ◽  
Hong Sun
Keyword(s):  
Crystal Structure ◽  
Magnetic Measurements ◽  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
Antiferromagnetic Coupling ◽  
Solvothermal Reaction ◽  
X Ray ◽  
Magnetic Investigation ◽  
Ft Ir ◽  
Scanning Electron

By using environmentally friendly K3[Co(CN)6] as a cyanide source, the solvothermal reaction of CuCl2 and tetrazole (Htta) led to a novel tetrazolate- and cyanide-bridged three-dimensional heterometallic CuII–CoIII complex, namely poly[[hexa-μ2-cyanido-κ12 C:N-pentakis(μ3-tetrazolato-κ3 N 1:N 2:N 4)cobalt(III)tetracopper(II)] monohydrate], {[CoIIICuII 4(CHN4)5(CN)6]·H2O} n , (I). The crystal structure analysis reveals that it is the first example of a (6,8,8)-connected three-dimensional framework with a unique topology, constructed from anionic [Co(CN)6]3− and cationic [(Cu1)2(tta)2]2+ and [(Cu2Cu3)(tta)3]+ units through μ2-cyanide and μ3-tetrazolate linkers. The compound was further characterized by thermal analysis, vibrational spectroscopy (FT–IR), scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM–EDS) and magnetic measurements. The magnetic investigation indicates that the complex exhibits antiferromagnetic coupling between adjacent CuII cations.

Synthesis of SnS2/SnO2 Nanocomposite for Visible Light-Driven Photocatalytic Reduction of Aqueous Cr(VI)

2013 ◽  
Vol 538 ◽  
pp. 46-49 ◽  
Author(s):  
Min Yang ◽  
Yong Cai Zhang ◽  
Wei Min Dai ◽  
Ke Hang ◽  
Yue Quan Pan
Keyword(s):  
Visible Light ◽  
Diffuse Reflectance ◽  
Reflectance Spectrum ◽  
Sno2 Nanoparticles ◽  
Diffuse Reflectance Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Visible Light Driven

SnS2/SnO2 nanocomposite was synthesized by a simple in situ hydrothermal oxidation route, and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy and UV-vis diffuse reflectance spectrum. The as-synthesized SnS2/SnO2 nanocomposite displayed much superior photocatalytic activity to SnS2 and SnO2 nanoparticles in the reduction of aqueous Cr(VI) under visible light (λ > 420 nm) irradiation.

New Titanium Oxide Compound for Photocatalytic Water Splitting, Hydrous Na16Ti10O28

2009 ◽  
Vol 421-422 ◽  
pp. 546-549
Author(s):  
Sae Nakajima ◽  
Soihiro Watanabe ◽  
Kazuyoshi Uematsu ◽  
Tadashi Ishigaki ◽  
Kenji Toda ◽  
...  
Keyword(s):  
Water Splitting ◽  
Diffuse Reflectance ◽  
Reflectance Spectrum ◽  
Diffuse Reflectance Spectrum ◽  
H2 Evolution ◽  
X Ray Diffraction ◽  
Oxide Compound ◽  
Co Catalyst ◽  
X Ray ◽  
Scanning Electron

Photochemical splitting of water into H2 and O2 using solar energy is process of great economic and environmental interest. In this study, we investigated novel photocatalytic compound, Na16Ti10O28, for water splitting. Na16Ti10O28 was prepared by solid-state reaction at 900 oC for 1 h. Prepared sample was characterized using powder X-ray diffraction, diffuse reflectance spectrum, and scanning electron microscopy. As-prepared Na16Ti10O28 sample is easily hydrated in water. Hydrous Na16Ti10O28 showed H2 evolution without co-catalyst.

Diffuse Reflectance Spectrum of Ferric Oxide

1970 ◽  
Vol 3 (11-12) ◽  
pp. 297-301 ◽  
Author(s):  
S. P. Tandon ◽  
J. P. Gupta
Keyword(s):  
Ferric Oxide ◽  
Diffuse Reflectance ◽  
Reflectance Spectrum ◽  
Diffuse Reflectance Spectrum

Ferromagnetic interactions in a dicyanamide-bridged multinuclear metal-organic framework [Pr3NH]+ [Mn(dca)3]−·H2O

2019 ◽  
Vol 74 (6) ◽  
pp. 485-489
Author(s):  
Yuan Huang ◽  
Xiu-feng Yu ◽  
Zhen Rong ◽  
Yi-chun Ai ◽  
Kun Qian ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Measurements ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Magnetic Susceptibility Data ◽  
X Ray ◽  
Susceptibility Data ◽  
Metal Organic ◽  
Ferromagnetic Interactions

AbstractA new complex [Pr3NH]+ [Mn(dca)3]− · H2O (dicyanamide = dca−) was synthesized, in which the Mn2+ cations are bridged by end-to-end dca anions to form three-dimensional [Mn(dca)3]nn− networks and tripropylammonium cations reside in the cavities of these networks. The complex has been characterized by single-crystal X-ray diffraction, infrared spectroscopy, elemental analysis, and magnetic measurements. Magnetic susceptibility data indicate ferromagnetic interactions among the MnII ions.

Structure and Magnetism of REPtMg (RE = Pr,Nd, Sm)

2002 ◽  
Vol 57 (5) ◽  
pp. 488-494 ◽  
Author(s):  
Rainer Kraft ◽  
Gunter Kotzyba ◽  
Rolf-Dieter Hoffmann ◽  
Rainer Pöttgen
Keyword(s):  
Spin Structure ◽  
Three Dimensional ◽  
Point Of View ◽  
Single Crystal Diffraction ◽  
Magnetic Susceptibility Data ◽  
X Ray ◽  
Susceptibility Data ◽  
Complex Spin ◽  
Ferromagnetic Ordering ◽  
Ordered State

New magnesium based intermetallic compounds PrPtMg, NdPtMg and SmPtMg were synthesized from the elements by reaction in sealed tantalum tubes in a high-frequency furnace. The three compounds were investigated by X-ray powder and single crystal diffraction: ZrNiAl type, space group P6̄2m, a = 752.34(8), c = 412.66(4) pm, wR2 = 0.0668, 341 F2 values, 14 variables for PrPtMg, a = 748.80(8), c = 411.52(4) pm, wR2 = 0.0521, 196 F2 values, 14 variables for NdPtMg and a = 743.90(5), c = 409.80(3) pm, wR2 = 0.0489, 248 F2 values, 12 variables for SmPtMg. From a geometrical point of view these structures are composed of two types of platinum centered trigonal prisms, i. e. [Pt1Mg3RE6] and [Pt2Mg6RE3]. These prisms are condensed via common edges and faces. Together the platinum and magnesium atoms build three-dimensional [PtMg] networks in which the rare earth atoms are located in distorted pentagonal channels. Magnetic susceptibility data of PrPtMg show Curie-Weiss behaviour with an experimentalmagnetic moment of 3.59(2) μB and a paramagnetic Curie temperature of 7.5(5) K. Ferromagnetic ordering is detected at TC = 8.0(5) K with a magnetic moment of 1.75(5) μB/Pr at 4.5 K and 5 T. SmPtMg orders ferromagnetically below 52(1) K with a presumably complex spin structure in the ordered state.

Quantification of hematite from the visible diffuse reflectance spectrum: effects of aluminium substitution and grain morphology

Clay Minerals ◽  
2011 ◽  
Vol 46 (1) ◽  
pp. 137-147 ◽  
Author(s):  
Q. S. Liu ◽  
J. Torrent ◽  
V. Barrón ◽  
Z. Q. Duan ◽  
J. Bloemendal
Keyword(s):  
Mass Concentration ◽  
Diffuse Reflectance ◽  
Reflectance Spectrum ◽  
Diffuse Reflectance Spectrum ◽  
Grain Morphology ◽  
Characteristic Absorption Band ◽  
Chinese Loess ◽  
Al Substitution ◽  
Soils And Sediments ◽  
Visible Diffuse Reflectance Spectrum

AbstractHematite exists ubiquitously in soils and sediments, and is commonly aluminium (Al)-substituted. This study investigated systematically the effects of Al substitution on the visible diffuse reflectance spectrum (DRS) of hematite by using several sets of synthetic samples. We found that the position and amplitude of the characteristic absorption band of hematite (estimated from the first- and second-order derivative curves of the Kubelka-Munk remission function spectrum derived from the DRS) was significantly affected by the degree of Al substitution as well as by sample grain morphology. Therefore, there are ambiguities in quantifying the degree of Al substitution and the mass concentration of hematite using DRS. Nevertheless, if hematite forms under similar environmental conditions, it is possible to establish a transfer function between the DRS parameters and hematite concentration as discussed here for a Chinese loess-palaeosol sequence.

Synthesis and Crystal Structure of the Lead(II) Complex with 5-Hydroxyisophthalic Acid

2013 ◽  
Vol 634-638 ◽  
pp. 451-455
Author(s):  
Yan Yang ◽  
Liu Ting Yan ◽  
Rong Huan Qin ◽  
Wen Gui Duan
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Elemental Analysis ◽  
Three Dimensional ◽  
Single Crystal Diffraction ◽  
Intermolecular Hydrogen Bonds ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
3D Network ◽  
Hydrothermal Methods

The lead(II) Complex constructed with 5-hydroxyisophthalic acid, [Pb3(5-hipa)2]n•4H2O(1), (5-hipa = 5-hydro- xyisophthalic acid) has been synthesized by hydrothermal methods and structurally characterized by elemental analysis, IR and X-ray single crystal diffraction. In trinuclear symmetrical complex 1, Pb1 is four-coordinated, Pb2 and Pb3 are three-coordinated by 5-nitroisophthalic acid groups, respectively, which is further connected through intermolecular hydrogen bonds resulting in a three-dimensional (3D) network.

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