scholarly journals Bistriazole-p-benzoquinone and its alkali salts: electrochemical behaviour in aqueous alkaline solutions

2017 ◽  
Vol 46 (37) ◽  
pp. 12537-12543 ◽  
Author(s):  
H. Bunzen ◽  
A. Lamp ◽  
M. Grzywa ◽  
C. Barkschat ◽  
D. Volkmer
Keyword(s):  
Thermogravimetric Analysis ◽  
Single Crystal ◽  
Electrochemical Behaviour ◽  
Alkaline Solutions ◽  
Potassium Salts ◽  
X Ray ◽  
Cv Measurements ◽  
Alkali Salts ◽  
Sodium And Potassium

Lithium, sodium and potassium salts of bistriazole-p-benzoquinone were synthetized and studied by single crystal X-ray, VT-XRPD and thermogravimetric analysis, and CV measurements.

Synthesis of Sulfoquinovose and Sulfoquinovosyl Diacylglycerides, and a Fluorogenic Substrate for Sulfoquinovosidases

2019 ◽  
Author(s):  
Yunyang Zhang ◽  
Janice Mui ◽  
Thimali Arumaperuma ◽  
James P. Lingford ◽  
ETHAN GODDARD-BORGER ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Fluorogenic Substrate ◽  
Potassium Salts ◽  
X Ray ◽  
Sulfoquinovosyl Diacylglycerol ◽  
Sodium And Potassium

<p>The sulfolipid sulfoquinovosyl diacylglycerol (SQDG) and its headgroup, the sulfosugar sulfoquinovose (SQ), are estimated to harbour up to half of all organosulfur in the biosphere. SQ is liberated from SQDG and related glycosides by the action of sulfoquinovosidases (SQases). We report a 10-step synthesis of SQDG that we apply to the preparation of saturated and unsaturated lipoforms. We also report an expeditious synthesis of SQ and (<sup>13</sup>C<sub>6</sub>)SQ, and X-ray crystal structures of sodium and potassium salts of SQ. Finally, we report the synthesis of a fluorogenic SQase substrate, methylumbelliferyl a-D-sulfoquinovoside, and examination of its cleavage kinetics by two recombinant SQases.</p>

How the Magnetic Field Impacts the Chiroptical Activities of Helical Copper Enantiomers

2021 ◽  
Author(s):  
jialu wu ◽  
Bo Li ◽  
Hong Wang ◽  
Ying Zhen Lai ◽  
Yue Ye ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solid State ◽  
Thermogravimetric Analysis ◽  
Single Crystal ◽  
Structure Analysis ◽  
Chiral Ligands ◽  
X Ray ◽  
The Magnetic Field

A pair of enantiomers {[Cu(L-pro)(L-tyr)]·2H2O}n (L-1) and {[Cu(D-pro)(D-tyr)]·2H2O}n (D-1) based on the chiral ligands L/D-proline and L/D-tyrosine were synthesized and investigated by single-crystal X-ray structure analysis, IR, thermogravimetric analysis, solid-state...

Spectra of sodium and potassium azide crystals coloured by ultra-violet and X -ray radiation

1959 ◽  
Vol 251 (1264) ◽  
pp. 27-40 ◽  
Keyword(s):  
Sodium Salt ◽  
Ultra Violet ◽  
Liquid Nitrogen Temperature ◽  
Mechanism Of Formation ◽  
Potassium Salts ◽  
Absorption Bands ◽  
X Ray ◽  
Rate Of Increase ◽  
Potassium Azide ◽  
Sodium And Potassium

The spectra of sodium and potassium azide crystals that had been coloured by irradiation with both ultra-violet and X-ray radiation for varying periods at liquid-nitrogen temperature have been recorded. From these results and from measurements of the rate of increase of intensity of the various absorption bands with time, together with the changes observed on raising the temperature, the nature and mechanism of formation of some of the centres are deduced. The different behaviour of the sodium and potassium salts under irradiation and the different effects produced by the two types of irradiation, particularly with the sodium salt, are discussed.

Cyclopentadienyl Zincates: Synthesis and X-ray Studies of Sodium and Potassium Salts of the [Zn(C5H5)3]− and [Zn2(C5H5)5]− Ions

2007 ◽  
Vol 119 (8) ◽  
pp. 1318-1321 ◽  
Author(s):  
Eleuterio Alvarez ◽  
Abdessamad Grirrane ◽  
Irene Resa ◽  
Diego del Río ◽  
Amor Rodríguez ◽  
...  
Keyword(s):  
Potassium Salts ◽  
X Ray ◽  
Sodium And Potassium

Cyclopentadienyl Zincates: Synthesis and X-ray Studies of Sodium and Potassium Salts of the [Zn(C5H5)3]− and [Zn2(C5H5)5]− Ions

2007 ◽  
Vol 46 (8) ◽  
pp. 1296-1299 ◽  
Author(s):  
Eleuterio Alvarez ◽  
Abdessamad Grirrane ◽  
Irene Resa ◽  
Diego del Río ◽  
Amor Rodríguez ◽  
...  
Keyword(s):  
Potassium Salts ◽  
X Ray ◽  
Sodium And Potassium

Solid State Transitions in Alkali Alkanoates: Diffractometric and Conductometric Measurements on Rubidium and Cesium Propanoates

1979 ◽  
Vol 34 (10) ◽  
pp. 1212-1215 ◽  
Author(s):  
G. Spinolo ◽  
A. Cingolani ◽  
M. Sanesi
Keyword(s):  
Solid State ◽  
Powder Diffraction ◽  
State Transitions ◽  
Potassium Salts ◽  
X Ray ◽  
Rubidium Salt ◽  
Suitable Temperature ◽  
Temperature Ranges ◽  
Sodium And Potassium

Abstract Conductometric measurements on solid rubidium and cesium propanoates and X-ray powder diffraction measurements on the rubidium salt have been carried out over suitable temperature ranges. The results obtained, along with the previous ones concerning the lithium, sodium and potassium salts, have been discussed in relation to possible melting mechanisms (involving various kinds of disorder, e.g., positional, orientational, conformational) active in the alkali alkanoates family.

scholarly journals Solid State Transitions in Alkali Alkanoates: Diffractometric and Conductometric Measurements on Lithium, Sodium and Potassium Propanoates

1979 ◽  
Vol 34 (5) ◽  
pp. 575-578 ◽  
Author(s):  
A. Cingolani ◽  
G. Spinolo ◽  
M. Sanesi
Keyword(s):  
Phase Transitions ◽  
Solid State ◽  
Temperature Dependence ◽  
Powder Diffraction ◽  
State Transitions ◽  
Potassium Salts ◽  
Crystalline Phases ◽  
X Ray ◽  
Temperature Ranges ◽  
Sodium And Potassium

Abstract Conductometric measurements on solid lithium, sodium and potassium propanoates and X-ray powder diffraction measurements on the sodium and potassium salts have been performed over temperature ranges including solid state transitions. The temperature dependence of the transport and lattice parameters of the different crystalline phases and the changes of the same parameters in correspondence with phase transitions have been put into evidence.

Synthesis of Sulfoquinovose and Sulfoquinovosyl Diacylglycerides, and a Fluorogenic Substrate for Sulfoquinovosidases

2019 ◽  
Author(s):  
Yunyang Zhang ◽  
Janice Mui ◽  
Thimali Arumaperuma ◽  
James P. Lingford ◽  
ETHAN GODDARD-BORGER ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Fluorogenic Substrate ◽  
Potassium Salts ◽  
X Ray ◽  
Sulfoquinovosyl Diacylglycerol ◽  
Sodium And Potassium

<p>The sulfolipid sulfoquinovosyl diacylglycerol (SQDG) and its headgroup, the sulfosugar sulfoquinovose (SQ), are estimated to harbour up to half of all organosulfur in the biosphere. SQ is liberated from SQDG and related glycosides by the action of sulfoquinovosidases (SQases). We report a 10-step synthesis of SQDG that we apply to the preparation of saturated and unsaturated lipoforms. We also report an expeditious synthesis of SQ and (<sup>13</sup>C<sub>6</sub>)SQ, and X-ray crystal structures of sodium and potassium salts of SQ. Finally, we report the synthesis of a fluorogenic SQase substrate, methylumbelliferyl a-D-sulfoquinovoside, and examination of its cleavage kinetics by two recombinant SQases.</p>

Disorder and polymorphism in Cu(ii)-polyoxometalate complexes: [Cu1.5(H2O)7.5PW12O40]·4.75H2O, cis- & trans-[Cu2(H2O)10SiW12O40]·6H2O

CrystEngComm ◽  
2016 ◽  
Vol 18 (28) ◽  
pp. 5327-5332 ◽  
Author(s):  
Sneha R. Bajpe ◽  
Sebastian Henke ◽  
Jung-Hoon Lee ◽  
Paul D. Bristowe ◽  
Anthony K. Cheetham
Keyword(s):  
Thermogravimetric Analysis ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
X Ray

Three highly crystalline Cu(ii)-polyoxometalate (POM) complexes, [Cu1.5(H2O)7.5PW12O40]·4.75H2O and cis- and trans-[Cu2(H2O)10SiW12O40]·6H2O, were successfully synthesized and characterized by single crystal and powder X-ray diffraction as well as thermogravimetric analysis.

An unprecedented Zr-containing polyoxometalate tetramer with mixed trilacunary/dilacunary Keggin-type polyoxotungstate units

2018 ◽  
Vol 74 (11) ◽  
pp. 1284-1288 ◽  
Author(s):  
Zhong Zhang ◽  
Yue-Lin Wang ◽  
Guo-Yu Yang
Keyword(s):  
Thermogravimetric Analysis ◽  
Ir Spectroscopy ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
Remarkable Feature ◽  
Space Group ◽  
X Ray ◽  
Keggin Type

A novel zirconium(IV)-substituted tetramer polyoxotungstate, H6K4Na16[Zr4(β-GeW10O38)2(A-α-PW9O34)2]·37H2O, was synthesized hydrothermally and characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis, powder X-ray diffraction, energy-dispersive X-ray spectroscopy and single-crystal X-ray diffraction. The compound crystallizes in the monoclinic P2/n space group. The most remarkable feature is that the centrosymmetric Zr-based polyoxotungstate tetramer consists of dilacunary Keggin-type germanotungstate and trilacunary Keggin-type phosphotungstate units that are linked by ZrIV ions.

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