Synthetic Studies and Structural Aspects of some Metallacyclic Derivatives of Titanium (IV) - Better Precursors for Titania

2012 ◽  
Vol 584 ◽  
pp. 411-414 ◽  
Author(s):  
Madhvesh Pathak ◽  
Blassan Samuel ◽  
Kiran Tummalapalli ◽  
Prasanth Vuppalapati Giri ◽  
Rakesh Bohra ◽  
...  
Keyword(s):  
High Yield ◽  
Chemical Analyses ◽  
Molar Ratios ◽  
Octahedral Environment ◽  
Physico Chemical ◽  
Synthetic Studies ◽  
Derivatives Of ◽  
Structural Aspects

Titanium(IV) complexes of the type [(acac)2Ti(O-G-O] and [(acac)2Ti(OCH2CH2SH)2] {where G = (CH2)2, CH2CH(CH3), CH2CH(C2H5), CH(CH3)CH(CH3) have been synthesized in high yield by the interaction of the precursor [(acac)2Ti( OR)2] {where R = Pri , Et} with a variety of glycols and thioglycols in 1:1 and 1:2 molar ratios in refluxing benzene under anhydrous condition yield heteroleptic derivatives. On the basis of physico-chemical analyses, a cis-octahedral environment around Ti (IV) is proposed.

Preparation of CuO Nanopowder in Aqueous Solution by Applying Ultrasonic and its CO Gas Sensitivity

2007 ◽  
Vol 544-545 ◽  
pp. 901-904 ◽  
Author(s):  
Ji Bum Yang ◽  
Tae Gyung Ko ◽  
Sang Jin Jung ◽  
Jae Hee Oh
Keyword(s):  
Aqueous Solution ◽  
Gas Sensing ◽  
Spherical Shape ◽  
Particle Morphology ◽  
High Yield ◽  
Ambient Conditions ◽  
Gas Sensitivity ◽  
Molar Ratios ◽  
Naoh Solution ◽  
Co Gas

We report on a process in which CuO nanopowder was produced in a high yield by adopting ultrasonic in aqueous solution. In our experiment, CuCl2 solution was reacted with NaOH solution and NaNO2, at ambient conditions applying ultrasonic for 5 min. Precipitation was performed by varying the molar ratios of NaOH/CuCl2 and NaNO2/CuCl2. CuO nanoparticles of ~ 5 nm and spherical shape were obtained at the NaOH/CuCl2 of 2.0 and the NaNO2/CuCl2 of 0.097. Without ultrasonication, an amorphous phase was formed at these conditions. This indicates that sonochemical reaction facilitates direct formation of the nanosized CuO particles. In addition, the particle morphology varied from sphere through ellipsoid to needle forms depending on pH. In thick films prepared with the CuO powder for gas sensing, the maximum CO gas sensitivity reached 93 % at the temperature of 250 °C and depended linearly on CO concentration in log scale over the range of 10 ~ 104 ppm.

scholarly journals Total synthesis of [ 15 N]-labelled C6-substituted purines from [ 15 N]-formamide—easy preparation of isotopically labelled cytokinins and derivatives

2018 ◽  
Vol 5 (11) ◽  
pp. 181322 ◽  
Author(s):  
Jan Buček ◽  
Marek Zatloukal ◽  
Libor Havlíček ◽  
Lucie Plíhalová ◽  
Tomáš Pospíšil ◽  
...  
Keyword(s):  
Total Synthesis ◽  
Metabolic Profiling ◽  
Growth Regulation ◽  
Plant Tissues ◽  
Chemical Analyses ◽  
Purine Derivatives ◽  
Biological Matrices ◽  
Physico Chemical ◽  
Plant Growth Regulation

Cytokinins (CKs) and their metabolites and derivatives are essential for cell division, plant growth regulation and development. They are typically found at minute concentrations in plant tissues containing very complicated biological matrices. Therefore, defined standards labelled with stable isotopes are required for precise metabolic profiling and quantification of CKs, as well as in vivo elucidation of CK biosynthesis in various plant species. In this work, 11 [ 15 N]-labelled C6-purine derivatives were prepared, among them 5 aromatic ( 4, 5, 6, 7, 8 ) and 3 isoprenoid ( 9, 10, 11 ) CKs. Compared to current methods, optimized syntheses of 6-amino-9H-[ 15 N 5 ]-purine (adenine) and 6-chloro-9H-[ 15 N 4 ]-purine (6-chloropurine) were performed to achieve more effective, selective and generally easier approaches. The chemical identity and purity of prepared compounds were confirmed by physico-chemical analyses (TLC; HRMS; HPLC–MS; 1 H, 13 C, 15 N NMR). The presented approach is applicable for the synthesis of any other desired [ 15 N 4 ]-labelled C6-substituted purine derivatives.

Investigation on full 6" masks using innovative solutions for direct physico-chemical analyses of mask contamination and haze

2011 ◽  
Author(s):  
L. Dussault ◽  
B. Pelissier ◽  
F. Dufaye ◽  
S. Gough ◽  
J. Hamonne ◽  
...  
Keyword(s):  
Chemical Analyses ◽  
Physico Chemical ◽  
Innovative Solutions

scholarly journals A Review - Carisoprodol as Skeletal Muscle Relaxant

2020 ◽  
pp. 40-44
Author(s):  
A. A Patil ◽  
M. K. Shirsat ◽  
V. R. Salunkhe
Keyword(s):  
Skeletal Muscle ◽  
Allocation Concealment ◽  
Muscle Relaxants ◽  
Chemical Methods ◽  
Physiochemical Properties ◽  
Musculoskeletal Conditions ◽  
Intention To Treat ◽  
Physico Chemical ◽  
Derivatives Of ◽  
Host Target

In the world of pharmacology, the prescription of a medicine and its dosage play important role. Different physico-chemical methods are in vogue in describing the interactions of the drug molecule with host target among them, the chief being spectroscopic, chromatographic and quantum mechanical techniques. Skeletal muscle relaxants are divided into two categories: antispastic (for conditions such as cerebral palsy and multiple sclerosis) and antispasmodic agents (for musculoskeletal conditions). Antispastic agents (e.g., baclofen [Lioresal], dantrolene [Dantrium]) should not be prescribed for musculoskeletal conditions because there is sparse evidence to support their use. Rather, anantispasmodic agent may be more appropriate Many of the studies evaluating the effectiveness of skeletal muscle relaxants are hampered by poor methodologic design, including incomplete reporting of compliance, improper or no mention of allocation concealment, not utilizing intention-to-treat methods, and inadequate randomization. skeletal muscle relaxants have been evaluated in systematic reviews and meta-analyses.These include Methocarbamol, Meprobamate, Metaxalone, Carisoprodol, Dantrium and Baclofen. Chemically Carisoprodol is N-isopropyl-2-methyl-2-propyl-1,3-propanediol dicarbamate. Methods like nitration, Sulphonation, Methylation, Esterification, Acetylation and Diazotization was used for formation of new derivative which can be detected in UV region. Different reactions of diazotization were used for getting a new and novel derivative of Carisoprodol. Physiochemical properties, TLC, UV, IR and NMR analysis of Carisoprodol and newly obtained derivatives of Carisoprodol was studied and it showed that there was change in color, odour, taste, melting point, solubility pattern of original drug and derivatives.

Comparative Study of Physico-Chemical Analyses of Different Water Resources in Setiu Wetland, Terengganu

2018 ◽  
pp. 25-37
Author(s):  
Mohd Nizam Lani ◽  
Nurul Fatin Malek Rivan ◽  
Adilah Ismail ◽  
Wan Bayani Wan Omar ◽  
Zaiton Hassan ◽  
...  
Keyword(s):  
Water Resources ◽  
Comparative Study ◽  
Chemical Analyses ◽  
Physico Chemical
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