Oxalate Bridged Copper Pyrazole Complex Templated Anderson-Evans Cluster Based Solids

2011 ◽  
Vol 64 (1) ◽  
pp. 68 ◽  
Author(s):  
Katikaneani Pavani ◽  
Monika Singh ◽  
Arunachalam Ramanan
Keyword(s):  
Room Temperature ◽  
Reaction Medium ◽  
Sodium Molybdate ◽  
Supramolecular Interactions ◽  
Reductive Coupling ◽  
Dissolved Carbon ◽  
Dissolved Carbon Dioxide ◽  
1D Chain ◽  
Covalently Linked

The synthesis of four new Anderson-Evans type cluster based solids was carried out from an aqueous solution containing sodium molybdate, chromium chloride, cupric chloride and pyrazole at room temperature: [{Cr3O(CH3COO)6(H2O)3}2{H7CrMo6O24}]·24H2O, 1; [{Cu2(ox)(pz)4}{H7CrMo6O24}]·11H2O, 3; [{Cu(pz)2(H2O)2}{Cu2(ox)(pz)4}{H5CrMo6O24}]·8H2O, 4; and [{Cu(pz)3Cl}{Cu2(ox)(pz)4}{H6CrMo6O24}]·8H2O, 5. In 1, the discrete Anderson-Evans cluster aggregates with trimeric chromium acetate cationic complex through supramolecular interactions. In 3–5, the Anderson-Evans cluster is covalently linked into a 1D chain through oxalate bridged copper pyrazole units. In 3, the chains are further stabilized by water oligomers. In 4 and 5, the chains are covalently linked into 2D sheets by different copper pyrazole complexes. The oxalate molecules in 3–5 are probably generated in situ in the reaction medium, through a reductive coupling of dissolved carbon dioxide assisted by copper pyrazole units.

scholarly journals In Situ Quantitative Raman Detection of Dissolved Carbon Dioxide and Sulfate in Deep-Sea High-Temperature Hydrothermal Vent Fluids

2018 ◽  
Vol 19 (6) ◽  
pp. 1809-1823 ◽  
Author(s):  
Lianfu Li ◽  
Xin Zhang ◽  
Zhendong Luan ◽  
Zengfeng Du ◽  
Shichuan Xi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Deep Sea ◽  
Hydrothermal Vent ◽  
Dissolved Carbon ◽  
Dissolved Carbon Dioxide

[bmim]PF6/KOH: A Recyclable Catalytic System for an Azide–Arylacetaldehyde [3 + 2] Cycloaddition

2017 ◽  
Vol 41 (11) ◽  
pp. 631-635
Author(s):  
Yuqin Jiang ◽  
Kai Wu ◽  
Xuxia Tan ◽  
Dandan Zhang ◽  
Wenpei Dong ◽  
...  
Keyword(s):  
Transition Metal ◽  
Organic Solvent ◽  
Catalytic System ◽  
Room Temperature ◽  
Reaction Medium ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Green Protocol ◽  
Mild Conditions

A fast and green protocol for the synthesis of 1,4-disubstituted 1,2,3-triazoles from azides and arylacetaldehydes at room temperature was developed using [bmim]PF6/KOH as the reaction medium. It was found that the in situ-generated carbene from [bmim]PF6/KOH acted as the catalyst. In the absence of a transition-metal catalyst and organic solvent, this azide–arylacetaldehyde [3 + 2] cycloaddition proceeds efficiently, with high levels of regioselectivity, broad range of substrates, excellent yields and simple operation under mild conditions.

Synthesis and Photo-Response of CuS Thin Films by an In Situ Multi-Deposition Process at Room Temperature: A Facile and Eco-Friendly Approach

NANO ◽  
2015 ◽  
Vol 10 (03) ◽  
pp. 1550032 ◽  
Author(s):  
Weiyan Liu ◽  
Huiming Ji ◽  
Jian Wang ◽  
Xuerong Zheng ◽  
Junyun Lai ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Texture Coefficient ◽  
Reaction Medium ◽  
Deposition Process ◽  
Solar Cell Application ◽  
X Ray ◽  
Solid Films ◽  
Photo Response

Uniform hexagonal covellite CuS thin films were deposited at room temperature by an in situ solution chemical reaction using copper precursor solid films as cationic source and ammonium sulfide ethanol solution as anionic reaction medium. We investigated the influence of both ethanolamine and butanol contents used in copper nitrate/ethylene glycol monomethylether (EGME) cationic solution for the preparation of copper precursor solid films, deposition cycle numbers and annealing treatment of the as-grown thin films by X-ray diffraction (XRD), FESEM, energy dispersive X-ray fluorescence EDX, transmission electron microscopy–Selected area electronic diffraction (TEM–SAED), atomic force microscopy (AFM) and ultraviolet-visible-near-infrared (UV-Vis–NIR) measurements. Photo-response of the CuS thin films was characterized by linear sweep voltammetry. The deposited CuS thin films were used to sensitize TiO 2 anodes for solar cell application. The results showed that the CuS films had two-dimension oriented, half-sheet shaped growing morphology standing disorderly but vertically to substrates, and the calculated texture coefficient TC(102) verified that the half-sheet shaped crystallites had (102) plane orientation. This in situ multi-deposition process had an average deposited rate of 9 nm per cycle, and a self-perfect function to grow smooth, uniform and 2D oriented morphology with increase in the dip-cycle numbers. The photocurrent density was 14.5 Ma/cm2 at 1 V versus Ag / AgCl electrode for the annealed CuS thin films. CuS -sensitized TiO 2 solar cells had a maximum conversion efficiency of 0.224%.

Synthesis and Crystal Structures of Copper(II), Zinc(II), Lead(II) and Cadmium(II) Tetrazole-5-carboxylate Complexes Generated via in situ Hydrolysis Reaction

2010 ◽  
Vol 65 (12) ◽  
pp. 1467-1471 ◽  
Author(s):  
Jun-Feng Kou ◽  
Meng Su ◽  
Yu-Hong Zhang ◽  
Zhan-Dong Huang ◽  
Seik Weng Ng ◽  
...  
Keyword(s):  
Room Temperature ◽  
Acid Ethyl Ester ◽  
Chain Structure ◽  
Dinuclear Complexes ◽  
Dsc Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
1D Chain ◽  
Polymeric Framework

Four metal complexes, namely [Cu2(ttzCOO)2(H2O)4]・4H2O (1), [Zn2(ttzCOO)2(H2O)6]・2H2O (2), [Pb(ttzCOO)(H2O)2]n (3), and {[Cd(ttzCOO)(H2O)]・1/2H2O}n (4), where ttzCOO2− = tetrazole-5-carboxylate dianion, have been prepared by the reaction of the sodium salt of 1Htetrazole- 5-carboxylic acid ethyl ester in aqueous methanolic solution at room temperature with CuCl2, ZnI2, Pb(NO3)2, or Cd(NO3)2, respectively. The compounds were characterized by elemental analysis, IR spectroscopy, TG-DSC analysis and single-crystal X-ray diffraction. While 1 and 2 are structurally similar dinuclear complexes, 3 and 4 exhibit a 1D chain structure and a 3D polymeric framework, respectively.

scholarly journals Real‐time dissolved carbon dioxide monitoring I: Application of a novel in situ sensor for CO 2 monitoring and control

2020 ◽  
Vol 117 (4) ◽  
pp. 981-991 ◽  
Author(s):  
Viki R. Chopda ◽  
Timothy Holzberg ◽  
Xudong Ge ◽  
Brandon Folio ◽  
Michael Tolosa ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Real Time ◽  
Monitoring And Control ◽  
Dissolved Carbon ◽  
Dissolved Carbon Dioxide ◽  
Carbon Dioxide Monitoring ◽  
In Situ Sensor ◽  
And Control

Otoconia perfect/imperfect crystals

1994 ◽  
Vol 52 ◽  
pp. 42-43
Author(s):  
César D. Fermin ◽  
Dale Martin
Keyword(s):  
Image Processing ◽  
Room Temperature ◽  
Phosphotungstic Acid ◽  
Gallus Domesticus ◽  
Crystal Matrix ◽  
Organic Templates ◽  
Image Processing Algorithms ◽  
Processing Algorithms ◽  
Diffraction Patterns

Otoconia of higher vertebrates are interesting biological crystals that display the diffraction patterns of perfect crystals (e.g., calcite for birds and mammal) when intact, but fail to produce a regular crystallographic pattern when fixed. Image processing of the fixed crystal matrix, which resembles the organic templates of teeth and bone, failed to clarify a paradox of biomineralization described by Mann. Recently, we suggested that inner ear otoconia crystals contain growth plates that run in different directions, and that the arrangement of the plates may contribute to the turning angles seen at the hexagonal faces of the crystals.Using image processing algorithms described earlier, and Fourier Transform function (2FFT) of BioScan Optimas®, we evaluated the patterns in the packing of the otoconia fibrils of newly hatched chicks (Gallus domesticus) inner ears. Animals were fixed in situ by perfusion of 1% phosphotungstic acid (PTA) at room temperature through the left ventricle, after intraperitoneal Nembutal (35mg/Kg) deep anesthesia. Negatives were made with a Hitachi H-7100 TEM at 50K-400K magnifications. The negatives were then placed on a light box, where images were filtered and transferred to a 35 mm camera as described.

In Situ Localization of PPAR Gamma and Uncoupling Protein in Mouse Embryo Sections Using Digoxigenin-Labeled Riboprobes

1996 ◽  
Vol 54 ◽  
pp. 32-33
Author(s):  
C. Jennermann ◽  
S. A. Kliewer ◽  
D. C. Morris
Keyword(s):  
Alkaline Phosphatase ◽  
Room Temperature ◽  
Uncoupling Protein ◽  
Ppar Gamma ◽  
Nuclear Hormone Receptor ◽  
Full Length ◽  
Northern Analysis ◽  
Peroxisome Proliferator

Peroxisome proliferator-activated receptor gamma (PPARg) is a member of the nuclear hormone receptor superfamily and has been shown in vitro to regulate genes involved in lipid metabolism and adipocyte differentiation. By Northern analysis, we and other researchers have shown that expression of this receptor predominates in adipose tissue in adult mice, and appears first in whole-embryo mRNA at 13.5 days postconception. In situ hybridization was used to find out in which developing tissues PPARg is specifically expressed.Digoxigenin-labeled riboprobes were generated using the Genius™ 4 RNA Labeling Kit from Boehringer Mannheim. Full length PPAR gamma, obtained by PCR from mouse liver cDNA, was inserted into pBluescript SK and used as template for the transcription reaction. Probes of average size 200 base pairs were made by partial alkaline hydrolysis of the full length transcripts. The in situ hybridization assays were performed as described previously with some modifications. Frozen sections (10 μm thick) of day 18 mouse embryos were cut, fixed with 4% paraformaldehyde and acetylated with 0.25% acetic anhydride in 1.0M triethanolamine buffer. The sections were incubated for 2 hours at room temperature in pre-hybridization buffer, and were then hybridized with a probe concentration of 200μg per ml at 70° C, overnight in a humidified chamber. Following stringent washes in SSC buffers, the immunological detection steps were performed at room temperature. The alkaline phosphatase labeled, anti-digoxigenin antibody and detection buffers were purchased from Boehringer Mannheim. The sections were treated with a blocking buffer for one hour and incubated with antibody solution at a 1:5000 dilution for 2 hours, both at room temperature. Colored precipitate was formed by exposure to the alkaline phosphatase substrate nitrobluetetrazoliumchloride/ bromo-chloroindlylphosphate.

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