The Interaction of Tetramethylthiuram Disulfide with Rubber and with Compounds Containing a Labile Hydrogen Atom

1960 ◽  
Vol 33 (2) ◽  
pp. 401-411 ◽  
Author(s):  
B. A. Dogadkin ◽  
V. A. Shershnev
Keyword(s):  
Hydrogen Atom ◽  
Carbon Disulfide ◽  
Three Dimensional ◽  
Radical Mechanism ◽  
Labile Hydrogen ◽  
Paramagnetic Resonance ◽  
Tetramethylthiuram Disulfide ◽  
Dimensional Network ◽  
Sulfur Addition ◽  
Labile Hydrogen Atom

Abstract In the interaction of TMTD with rubber, sulfur and nitrogen from the TMTD add to the rubber, a maximum being exhibited on the rate curve for sulfur addition. At the same time dimethyldithiocarbamic acid is formed which, in mixtures containing zinc oxide, becomes bound in the form of Zn-DDC but which decomposes to carbon disulfide and dimethylamine in mixtures containing magnesium and calcium oxides and in the absence of metallic oxides. In the absence of oxides or in the presence of CaO or MgO a less dense three dimensional network is formed and reversion takes place which is accelerated by carbon disulfide and dimethylamine. The degree of crosslinking increases with increase in content of 1,4 structural units while the amount of combined sulfur and the rate of accumulation of zinc dithiocarbamate diminish. Dithiocarbamic acid also forms in the interaction of TMTD with geraniol and isopropylbenzene. The thermal decomposition of TMTD to thiuram monosulfide, sulfur, tetramethylthiourea and carbon disulfide takes place in the absence of compounds with a labile hydrogen atom. The reaction proceeds through the stage of rupture of the S—S and C—;S bonds of TMTD to form free radicals. The radical mechanism of the reaction is confirmed by electronic paramagnetic resonance specta.

scholarly journals The phase transition of rubidium hydrogen carbonate, RbHCO3

2017 ◽  
Vol 73 (7) ◽  
pp. 975-979 ◽  
Author(s):  
Carla Larvor ◽  
Berthold Stöger
Keyword(s):  
Phase Transition ◽  
Hydrogen Bonding ◽  
High Temperature ◽  
Hydrogen Atom ◽  
Low Temperature ◽  
Three Dimensional ◽  
Disorder Phase Transition ◽  
Dimensional Network ◽  
Hydrogen Carbonate ◽  
Index 2

Rubidium hydrogen carbonate, RbHCO3, features an order/disorder phase transition atTC= 245 K from the high-temperature (HT) disorderedC2/mmodification to the low-temperature (LT)C-1 modification. The crystal structures are characterized by [HCO3]22−pairs of hydrogen carbonate groups connected by strong hydrogen bonding. The [HCO3]22−pairs are connected by Rb+cations into a three-dimensional network. In HT-RbHCO3, the hydrogen atom is disordered. In LT-RbHCO3, ordering of the hydrogen atom leads to atranslationengleichesymmetry reduction of index 2. The lost reflections and rotations are retained as twin operations.

Reactions of polyfluoronitroalkanes that contain a labile hydrogen atom

1974 ◽  
Vol 23 (11) ◽  
pp. 2421-2424 ◽  
Author(s):  
A. M. Krzhizhcvskii ◽  
N. S. Mirzabekyants ◽  
Yu. A. Cheburkov ◽  
I. L. Knunyants
Keyword(s):  
Hydrogen Atom ◽  
Labile Hydrogen ◽  
Labile Hydrogen Atom

The guanidinium t-diaqua-bis(oxalato)chromate(III) dihydrate complex: synthesis, crystal structure, EPR spectroscopy and magnetic properties

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Idelle Nono Kamga ◽  
Augustin Nkwento Nana ◽  
Bridget Ndoye Ndosiri ◽  
Frédéric Capet ◽  
Michel Foulon ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
Dimensional Network ◽  
Ft Ir ◽  
Water Ligands ◽  
Electron Paramagnetic ◽  
Oxygen Atoms

Abstract A new salt (CH6N3)[t-Cr(C2O4)2(H2O)2]·2H2O (1) (CH6N3 + = guanidinium cation) has been synthesized and characterized by single-crystal X-ray diffraction, FT-IR and UV–Vis spectroscopies, elemental and thermogravimetric analyses. In the crystal structure of 1, the chromate(III) ion lies on an inversion center in the form of an elongated octahedron. The coordination sphere consists of four oxygen atoms of two chelating oxalato ligands in the equatorial plane and two axial oxygen atoms of water ligands. The structural feature of focal interest in the structure of 1 is the formation of pillars of [Cr(C2O4)2(H2O)2]− complex anions and CH6N3 + guanidinium cations, with the next-neighbor cations rotated by an angle of 60° relative to each other. O–H···O and N–H···O hydrogen bonds play an important role in the construction of the three-dimensional network. The electron paramagnetic resonance (EPR) and magnetic properties of 1 have also been investigated.

scholarly journals Re-refinement of sodium ammonium sulfate dihydrate at 170 K

IUCrData ◽  
2020 ◽  
Vol 5 (9) ◽  
Author(s):  
Tamira Eckhardt ◽  
Christoph Wagner ◽  
Peter Imming ◽  
Rüdiger W. Seidel
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Hydrogen Atom ◽  
Ammonium Sulfate ◽  
Paraelectric Phase ◽  
Three Dimensional ◽  
Synthetic Analogue ◽  
Acta Cryst ◽  
X Ray ◽  
Dimensional Network

The title compound, sodium ammonium sulfate dihydrate (SASD), NaNH4SO4·2H2O, a synthetic analogue of the mineral lecontite, is a well known ferroelectric. The crystal structure of the paraelectric phase has been re-refined at 170 K on the basis of single-crystal X-ray data, improving the previous study [Arzt & Glazer (1994). Acta Cryst. B50, 425–431] in terms of accuracy regarding hydrogen-atom positions and thus details of the hydrogen bonding. O—H...O and N—H...O hydrogen bonds between the principal building units [Na(OH2)4O2 octahedra, SO4 tetrahedra and ammonium cations] constitute a three-dimensional network structure.

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