Uranium(IV) trifluoromethanesulfonate and some ternary uranium(IV) trifluoromethanesulfonates

1987 ◽  
Vol 65 (2) ◽  
pp. 409-411 ◽  
Author(s):  
Madanmohan S. Gill ◽  
Anil K. Sethi ◽  
Rajendra D. Verma
Keyword(s):  
Room Temperature ◽  
Diffuse Reflectance ◽  
Magnetic Moments ◽  
Reflectance Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffuse Reflectance Spectra ◽  
Infrared Data

U(SO3CF3)4 and MIIUIV(SO3CF3)6, M = Mg, Mn, Fe, Zn, have been prepared by the reaction of their respective trifluoroacetates with HSO3CF3 acid in CF3COOH medium at room temperature. Infrared data indicate bidentate bridging —SO3CF3 groups in these compounds. Magnetic moments show the presence of uranium(IV) species. Diffuse reflectance spectra suggest six coordinate uranium(IV) although the presence of possible eight or higher coordinate uranium(IV) cannot be ruled out. X-ray diffraction studies reveal them to be definite entities.

scholarly journals Sintesis dan Karakterisasi Sifat Optik Eosin Y@Metal- Organic Framework Zirkonium Naftalendikarboksilat

2017 ◽  
Vol 6 (1) ◽  
Author(s):  
R. F. Kesuma ◽  
L. Yuliati ◽  
T. H. P. Brotosudarmo
Keyword(s):  
Diffuse Reflectance ◽  
Metal Organic Framework ◽  
Reflectance Spectra ◽  
Eosin Y ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffuse Reflectance Spectra ◽  
Metal Organic ◽  
Organic Framework

Eosin Y telah berhasil diembankan pada Metal-Organic Framework Zirkonium Naftalendikarboksilat (MOF Zr-NDC) dengan cara menambahkan Eosin Y dalam pelarut etanol (0,034 ml, 10-4 M) pada MOF Zr-NDC (0,3 g). Pengukuran Powder X-Ray Diffraction (PXRD) dilakukan untuk mengkonfirmasi pembentukan MOF Zr-NDC dengan puncak khas pada 2θ di 6.47 dan 7.45. Spektra UV-vis Diffuse Reflectance Spectra diperoleh dengan menggunakan spektrofotometer UV-vis. MOF Zr-NDC memberikan serapan pada 274 nm yang berhubungan dengan energi celah sebesar 4.32 eV, sedangkan Eosin Y menunjukkan serapan pada 524 nm. Di sisi lain, Eosin Y@MOF Zr-NDC menunjukkan puncak-puncak serapan pada 300, 357, dan 524 nm yang berkorelasi dengan energi celah masing-masing sebesar 3,65, 3,15, dan 2,19 eV

scholarly journals Sintesis dan Karakterisasi TiO2 Terdoping Nitrogen (N-Doped TiO2) dengan Metode Sol–Gel

2016 ◽  
Vol 19 (2) ◽  
pp. 63-67
Author(s):  
Slamet Karim ◽  
Pardoyo Pardoyo ◽  
Agus Subagio
Keyword(s):  
Fourier Transform ◽  
Diffuse Reflectance ◽  
Sol Gel ◽  
Reflectance Spectra ◽  
X Ray Diffraction ◽  
Doped Tio2 ◽  
X Ray ◽  
Diffuse Reflectance Spectra ◽  
Infra Red ◽  
Uv Visible

Energi celah pita yang lebar dari semikonduktor TiO2 yang setara dengan cahaya ultraviolet (l<380 nm) membatasi aplikasi fotokatalitik hanya terbatas pada daerah ultraviolet dan tidak pada daerah cahaya tampak (l = 400 nm–700 nm). Pada penelitian ini dilakukan sintesis TiO2 teremban nitrogen yang dipreparasi melalui metode sol-gel. Prekursor TiCl4 digunakan sebagai sumber titanium dioksida dan CO(NH2)2 sebagai sumber nitrogen dan divariasi pada jumlah konsentrasi N dengan variasi 20 g, 30 g, 40 g dan 50 g. Refluks dilakukan pada suhu 100oC selama 7 jam dilanjutkan dengan pengeringan selama 3 jam pada suhu 100oC, dan kalsinasi pada suhu 500oC selama 7 jam . Karakterisasi N-doped TiO2 dilakukan menggunakan X-ray Diffraction (XRD), Fourier Transform–Infra Red spectroscopy (FTIR), dan UV- Visible diffuse reflectance spectra (UV-Vis DRS). Berdasarkan data XRD diketahui bahwa kristal N- doped TiO2 berstruktur anatase dengan indeks Miller 101. Spektra FTIR menunjukkan pergeseran serapan vibrasi O-Ti-O pada bilangan gelombang 400-1050 cm-1, diperkirakan sebagai akibat terbentuknya ikatan N-Ti-O. Spektrum DRS-UV–tampak menunjukkan penurunan energi celah pita dari TiO2 yakni 3,2 eV. Dapat disimpulkan bahwa penambahan konsentrasi nitrogen mengakibatkan penurunan energi celah pita, pada variasi 20g sebesar 3,12 eV, 30 g sebesar 3,09 eV, 40 g sebesar 3,082 eV, dan 50 g sebesar 3,08 eV.

Synthesis and Characterization of Cu2O/TNTs Nanocomposites

2009 ◽  
Vol 79-82 ◽  
pp. 601-604
Author(s):  
Hui Liu ◽  
Li Ang Song ◽  
Wei Liu ◽  
Ge Su ◽  
Li Xin Cao ◽  
...  
Keyword(s):  
Diffuse Reflectance ◽  
Reflectance Spectra ◽  
Synthesis And Characterization ◽  
Visible Light Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffuse Reflectance Spectra ◽  
Transmission Electron ◽  
Light Region

Cu2O/TNTs(Titanium-based Nanotubes) composites were prepared by a simple “soak-deoxidize” method by using hydrazine hydrate as the reducing agent. The Cu2O/TNTs composites particles was made by changing pH and the mol ratio of Cu2+:N2H4H2O. The obtained composites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), UV-Vis Diffuse reflectance spectra(DRS). The results of UV-Vis diffuse reflectance spectra indicate that the absorption edge of Cu2O/TNTs shows a shift to visible-light region, followed by an obvious absorption peak at 500–700 nm.

Complexes of Oxamic Acid with Al(III), Ga(III), In(III), Tl(III), Y(III), Fe(III), Mn(II) and V(III)

1978 ◽  
Vol 33 (9) ◽  
pp. 987-989 ◽  
Author(s):  
J. K. Kouinis ◽  
J. M. Tsangaris ◽  
A. G. Galinos
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Diffuse Reflectance ◽  
Magnetic Moments ◽  
Reflectance Spectra ◽  
Trivalent Metal ◽  
Diffuse Reflectance Spectra ◽  
Trivalent Metal Ions

The preparation of complexes of oxamic acid with Al(III), Ga(III), In(III), Tl(III), Y(III), Fe(III), Mn(II) and V(III) is reported. From the study of the infrared and diffuse reflectance spectra and the magnetic moments (for the complexes of Fe(III), Mn(II) and V(III)) it is concluded that in all complexes the metal ion is coordinated with the carboxyl oxygen and the amidic nitrogen, after the ionization of one of the amidic hydrogens.Octahedral structures are proposed for all the complexes of the trivalent metal ions and the complex K2{Mn(oxamic)2} · 2 H2O.

scholarly journals Stable Organic-Inorganic Hybrid Bismuth-Halide Monocrystalline Compounds With Adjustable Optoelectronic Properties

2021 ◽  
Author(s):  
Xinru Hu ◽  
Jilin Wang ◽  
Jian He ◽  
Guoyuan Zheng ◽  
Disheng Yao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Room Temperature ◽  
Diffuse Reflectance ◽  
Decomposition Temperature ◽  
X Ray Diffraction ◽  
Monoclinic System ◽  
X Ray ◽  
Good Thermal Stability ◽  
Chemical Groups ◽  
Thermal Stability Of

Abstract Two kinds of novel organic-inorganic bismuth-halide hybrid monocrystalline compounds (C6H5CH2NH3)2BiCl5 and (C6H5CH2NH3)BiI4 were synthesized and characterized. The crystal structure, intermolecular interaction, morphology, chemical groups and bonds, optical and thermal stability of the samples were systematically investigated through single crystal X-ray diffraction, Hirshfeld surface analysis, SEM, FTIR, TG and UV-vis diffuse reflectance spectra. The results indicated that (C6H5CH2NH3)2BiCl5 and (C6H5CH2NH3)BiI4 crystals displayed a monoclinic system with the space group P21/c and P21/n at room temperature, respectively. These materials showed strong absorption in the ultraviolet and visible light regions, resulting in very low Eg, which could be continuously adjustable from 1.67 eV to 3.21 eV by changing the halogen ratio. In addition, these hybrid materials also exhibited good thermal stability. The decomposition temperature of (C6H5CH2NH3)2BiCl5 and (C6H5CH2NH3)BiI4 were 260℃ and 300℃ respectively. Therefore, these organic-inorganic bismuth-halide hybrid compounds have excellent development potential in the field of solar cell research.

scholarly journals Hydrogen-Assisted Thermocatalysis over Titanium Nanotube for Oxidative Desulfurization

Catalysts ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 29
Author(s):  
Weiwei Tang ◽  
Yue Yao ◽  
Xiaoqiao Huang
Keyword(s):  
Diffuse Reflectance ◽  
Oxidative Desulfurization ◽  
Molar Ratio ◽  
Optimal Conditions ◽  
X Ray Diffraction ◽  
Step Method ◽  
X Ray ◽  
Diffuse Reflectance Spectra ◽  
Ft Ir ◽  
Catalyst Dosage

Titanium nanotubes were hydrothermally synthesized via a two-step method for ODS (oxidative desulfurization). The catalysts’ structures were characterized by XRD (X-ray diffraction), FT-IR, UV-Vis (UV-Vis diffuse reflectance spectra), NH3-TPD, etc. The effects of O/S molar ratio and catalyst dosage, etc., were systematically investigated. The catalyst exhibited remarkable performance, so that the removal of DBT (dibenzothiophene) was nearly 100% under the optimal conditions in 10 min. Also, the catalysts could be easily reused for six consecutive cycles. The hydrogen-assisted thermocatalytic mechanism over titanium nanotubes for ODS was also studied and an effective reactant concentration (ERC) number of 70.8 was calculated.

scholarly journals Ultrasound-Assisted Rapid ZIF-8 Synthesis, Porous ZnO Preparation by Heating ZIF-8, and Their Photocatalytic Activity

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Pham Dinh Du ◽  
Nguyen Trung Hieu ◽  
Tran Vinh Thien
Keyword(s):  
Photocatalytic Activity ◽  
Room Temperature ◽  
Diffuse Reflectance ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Zeolitic Imidazolate Framework ◽  
X Ray ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Adsorption Desorption

Zeolitic imidazolate framework-8 (ZIF-8) is synthesized quickly at room temperature in methanol with the support of ultrasound. Porous ZnO is also prepared via the thermal treatment of ZIF-8. The photocatalytic activities of the obtained materials are demonstrated via methylene blue (MB) decomposition under UV radiation. The obtained materials are characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherms, UV-Vis diffuse reflectance spectra (DR-UV-Vis), and photoluminescence spectra. The results indicate that ZIF-8 and the materials obtained from ZIF-8 by heating in the air have photocatalytic activity under UV irradiation. The ZnO sample obtained by ZIF-8 calcination at 660°C for 5 h has the highest photocatalytic activity. However, the MB degradation photocatalytic efficiency of the ZnO samples is even lower than that of the ZIF-8 samples, indicating that ZIF-8 is an effective photocatalyst in the treatment of environmental pollution.

scholarly journals Synthesis, characterization, electrochemical studies and X-ray structures of mixed-ligand polypyridyl copper(II) complexes with the acetate

2016 ◽  
Vol 81 (11) ◽  
pp. 1251-1262 ◽  
Author(s):  
Oluwafunmilayo Adekunle ◽  
Ray Butcher ◽  
Oladapo Bakare ◽  
Olusegun Odunola
Keyword(s):  
Room Temperature ◽  
Magnetic Measurements ◽  
Magnetic Moments ◽  
Copper Ion ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Elemental Analyses ◽  
Structural Details ◽  
Uv Visible

[Cu(phen)2(CH3COO)](ClO4).2H2O (1) and [Cu(bipy)2(CH3COO)]-(ClO4).H2O (2) {phen = 1,10-phenanthroline, bipy = 2,2?-bipyridine}were synthesized and characterized. The complexes were characterized by employying elemental analyses, infrared and UV-Visible spectroscopy, room temperature magnetic measurements and the crystal structures elucidated using X-ray diffraction experiment. The redox properties of the complexes were also investigated. Both structures have a square pyramidal CuN4O chromophore which exhibit significant distortions due to long Cu-O [2.217(3) ? for (1) and 2.179 (1) for (2)] and Cu-N [2.631(2) ? for (1) and 2.714(1) ? for (2)] bonds. This distortion if further shown by the O-Cu-N bond angles [147.71(8) o for (1) and 153.40(5) o for (2)]. The elemental analyses further support the structural details unveiled by the single crystal X-ray diffraction analysis. The infrared spectra shows the acetate vibrational frequencies at 1587 cm-1,1428 cm-1, 1314 cm-1 for (1) and 1571 cm-1, 1441 cm-1, 1319c m-1 for (2) and the perchlo-rate bands at 1059 cm-1, 720 cm-1 (1) and 1080 cm-1,768 cm-1 (2). The broad d-d bands for the copper ion at 14,514 cm-1(1) and 14,535 cm-1(2) support the adoption of square pyramid geometries. The magnetic moments for the two complexes are 1.83 B.M for (1) and 1.72 B.M for (2). The peak to peak values of the two complexes show that the electrode reactions are quasi-reversibile with ?Ep = 0.023V (1) and 0.025V for (2). In both structures, there are ?-? intermolecular interactions in addition to hydrogen bonding between the units.

Complexes of Oxamic Acid with Cu(II), Ni(II), Co(II) and Cr(III)

1977 ◽  
Vol 32 (6) ◽  
pp. 645-647 ◽  
Author(s):  
A. G. Galinos ◽  
J. M. Tsangaris ◽  
J. K. Kouinis
Keyword(s):  
Diffuse Reflectance ◽  
Magnetic Moments ◽  
Reflectance Spectra ◽  
Diffuse Reflectance Spectra

The preparation of the complexes of oxamic acid with Cu(II), Ni(II), Co(II) and Cr(III) is reported. From the study of IR, diffuse reflectance spectra and the magnetic moments it is concluded that in all complexes the metal is coordinated with the amidic nitrogen, after ionization of one amidic hydrogen, and with the carboxyl oxygen.Octahedral structures are proposed for the complexes K2[Ni(oxamic)2] · 2 H2O and K3[Cr(oxamic)3] and planar configurations for K2[Cu(oxamic)2] and K2[Co(oxamic)2].

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