Synthesis, physical properties and structural characterization of .mu.-carbonato-dicopper(II) complexes. 3. Isolation of a racemic crystal form of .mu.-carbonato-dichlorobis(N,N,N',N'-tetramethyl-1,3-propanediamine)dicopper(II) from a substitution reaction of biscarbonatotetrakis[chloro(N,N-diethylnicotinamide)copper(II)]

1982 ◽  
Vol 21 (3) ◽  
pp. 1002-1007 ◽  
Author(s):  
Melvyn Rowen. Churchill ◽  
Geoffrey. Davies ◽  
Mohamed A. El-Sayed ◽  
John P. Hutchinson
Keyword(s):  
Physical Properties ◽  
Structural Characterization ◽  
Substitution Reaction ◽  
Crystal Form

Synthesis, crystallization, X-ray structural characterization and solid-state assembly of a cyclic hexapeptoid with propargyl and methoxyethyl side chains

2017 ◽  
Vol 73 (3) ◽  
pp. 399-412 ◽  
Author(s):  
Consiglia Tedesco ◽  
Eleonora Macedi ◽  
Alessandra Meli ◽  
Giovanni Pierri ◽  
Giorgio Della Sala ◽  
...  
Keyword(s):  
Solid State ◽  
Hydrogen Bonds ◽  
Structural Characterization ◽  
Crystal Form ◽  
Side Chains ◽  
Crystal Forms ◽  
Hydrate Crystal ◽  
The Stability ◽  
Efficient Packing

The synthesis and the structural characterization of a cyclic hexapeptoid with four methoxyethyl and two propargyl side chains have disclosed the presence of a hydrate crystal form [form (I)] and an anhydrous crystal form [form (II)]. The relative amounts of form (I) and form (II) in the as-purified product were determined by Rietveld refinement and depend on the purification procedures. In crystal form (I), peptoid molecules assemble in a columnar arrangement by means of side-chain-to-backbone C=CH...OC hydrogen bonds. In the anhydrous crystal form (II), cyclopeptoid molecules form ribbons by means of backbone-to-backbone CH2...OC hydrogen bonds, thus mimicking β-sheet secondary structures in proteins. In both crystal forms side chains act as joints among the columns or the ribbons and contribute to the stability of the whole solid-state assembly. Water molecules in the hydrate crystal form (I) bridge columns of cyclic peptoid molecules, providing a more efficient packing.

scholarly journals Physical Properties and Structural Characterization of Ionic Liquids and Solid Electrolytes Utilizing the Carbamoylcyano(nitroso)methanide Anion

ChemPlusChem ◽  
2013 ◽  
Vol 78 (6) ◽  
pp. 468-468
Author(s):  
Judith Janikowski ◽  
Mohd R. Razali ◽  
Craig M. Forsyth ◽  
Kate M. Nairn ◽  
Stuart R. Batten ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Physical Properties ◽  
Structural Characterization ◽  
Solid Electrolytes

Physical Properties and Structural Characterization of Ionic Liquids and Solid Electrolytes Utilizing the Carbamoylcyano(nitroso)methanide Anion

ChemPlusChem ◽  
2013 ◽  
Vol 78 (6) ◽  
pp. 486-497 ◽  
Author(s):  
Judith Janikowski ◽  
Mohd R. Razali ◽  
Craig M. Forsyth ◽  
Kate M. Nairn ◽  
Stuart R. Batten ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Physical Properties ◽  
Structural Characterization ◽  
Solid Electrolytes

Study of Cure Synergism of the Thiocarbamylsulfenamide-Dibenzothiazyl Disulfide Accelerator System in the Vulcanization of Natural Rubber

1983 ◽  
Vol 56 (4) ◽  
pp. 827-837 ◽  
Author(s):  
D. Pal ◽  
B. Adhikari ◽  
D. K. Basu ◽  
A. K. Chaudhuri
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Physical Properties ◽  
Structural Characterization ◽  
Crosslink Density ◽  
Synergistic Activity ◽  
Elongation At Break ◽  
Equimolar Concentration ◽  
Accelerator System

Abstract N-cyclopentamethylenethiocarbamyl-N′-cyclopentamethylenesulfenamide (CPTCS) and dibenzothiazyldisulfide (MBTS), as binary accelerators in a mixture have been found to provide significant mutual enhanced activity with regard to modulus, tensile strength, hardness, and elongation at break in the vulcanization of NR gum stocks. The synergistic activity of the CPTCS-MBTS system is very much dependent upon the accelerator ratios, concentration of sulfur and accelerator, as well as the temperature of vulcanization. Investigations carried out with the Monsanto rheometer also corroborate the above results. It is suggested that the synergism arises out of the interaction between CPTCS and MBTS which produces intermediate accelerators. N,N-Diethylthiocarbamyl-N′-cyclohexylsulfenamide (DETCS) in conjunction with MBTS, produces similar results in the vulcanization of NR. Structural characterization of the vulcanizates obtained at 140 and 160°C reveals that predominantly monosulfidic linkages are obtained with CPTCS or DETCS and MBTS combinations. The intermediate combinations, at near equimolar concentration of the two accelerators, exhibit maximum crosslink density. An attempt has been made to correlate physical properties with crosslink density as well as various types of crosslinks.

Chemical Reactivity of Tetrasulfur Tetranitride: Synthesis, Physical Properties, and Structural Characterization of the Amorphous Phase Cu7S4N4.

ChemInform ◽  
2003 ◽  
Vol 34 (50) ◽  
Author(s):  
Stephan H. Irsen ◽  
Peter Kroll ◽  
Richard Dronskowski ◽  
Thomas E. Weirich ◽  
Matthias Epple
Keyword(s):  
Physical Properties ◽  
Amorphous Phase ◽  
Structural Characterization ◽  
Chemical Reactivity
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