2,2',4,4',6,6'-Hexanitrobiphenyl-3,3',5,5'-Tetramine: Synthesis and Comparison of Physicochemical Properties With Those of Other Amino Nitro Biphenyls

1987 ◽  
Vol 40 (1) ◽  
pp. 175 ◽  
Author(s):  
AJ Bell ◽  
E Eadie ◽  
RW Read ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Physicochemical Properties ◽  
Chemical Stability ◽  
Amino Groups ◽  
X Ray ◽  
X Ray Crystallography ◽  
Spectroscopic Characteristics ◽  
Impact Energies ◽  
Present Understanding

A synthesis of 2,2′,4,4′,6,6′-hexanitrobiphenyl-3,3′,5,5′-tetramine, the most highly aminated of a series of hexanitrobiphenyl explosives, is described, and its physical and spectroscopic characteristics determined. The thermal properties and impact sensitiveness of the explosive have been studied, and the substance has been found to be relatively unstable to heat and more sensitive to impact than expected by comparison with other aminated polynitroaromatic compounds. Evidence is provided which suggests that, contrary to present understanding, the introduction of amino groups into such nitroaromatics may decrease their thermal stability and lower their chemical stability sufficiently to allow partial decomposition at low impact energies. �The structure of the tetramine has been determined by X-ray crystallography, and the features likely to be responsible for the unexpected physicochemical properties of the tetramine are discussed based on this.

Evaluation of Thermal Properties of the Fe80Cr20 Nanostructure for Interconnect Application in High Temperature

2015 ◽  
Vol 815 ◽  
pp. 193-197 ◽  
Author(s):  
Abdul Mutalib Leman ◽  
Dafit Feriyanto ◽  
M.N.M. Salleh ◽  
Ishak Baba
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
High Temperature ◽  
Raw Material ◽  
Ultrasonic Technique ◽  
Material Combination ◽  
X Ray ◽  
Combination Technique ◽  
Eds Analysis ◽  
Thermal Stability Of

Metallic Fe80Cr20 alloy in thermal stability analysis is investigated. Approached method is combination technique (milled and UT) of ball milling (milled) combined with ultrasonic technique (UT) which is not yet fully explored. From Energy Dispersive x-ray Spectroscopy (EDS) analysis resulted that the composition of 80 wt% Fe and 20 wt% Cr in individual particle was achieved at milled and UB 4.5 h sample. Higher thermal stability of treated samples approximately 63% at 1100 °C temperature operation which showed by milled and UT at 4.5 h when compared to raw material. Combination technique shown high prospect to advance exploration in improving thermal stability which suitable for interconnect application.

Effects of CaO on the Yield and Thermal Properties of PANI Nanofibers

2017 ◽  
Vol 16 (2) ◽  
Author(s):  
Mohammad Mizanur Rahman Khan ◽  
Yee Keat Wee ◽  
Saif Uddin Ahmed ◽  
Masnun Naher ◽  
Muhammad Younus ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Energy Dispersive ◽  
Thermally Stable ◽  
X Ray ◽  
Pani Nanofibers ◽  
Increasing Trend ◽  
Thermal Stability Of ◽  
Pani Matrix

AbstractThe control of thermal stability of polyaniline (PANI) nanofibers is reported by systematically varying the loadings of CaO in the range from 0.005 g to 1.0 g. It was found to gradually increase the yield of synthesized PANI nanofibers with the increase of CaO addition. The highest yield, 1.103 g was obtained for 1.00 g loading of CaO. The incorporation of CaO into PANI matrix was revealed by energy-dispersive X-ray spectroscopy (EDX). Thermogravimetric analysis (TGA) data showed that the thermal stability of PANI nanofibers was greatly improved when CaO was added to the system. 1.00 g loading of CaO is favorable to obtain comparatively more thermally stable PANI. The degradation of PANI chains started at 330 °C for the PANI-CaO composites obtained at 1.00 g CaO addition, which is the highest temperature compared to PANI and the samples synthesized at other amount of CaO loadings. Furthermore, the increasing trend of thermal stability was observed with the increasing of CaO loading.

Chiral Helices in a 3D Network of Zn2(en)V2O7 (en = Ethylenediamine)

2008 ◽  
Vol 55-57 ◽  
pp. 669-672 ◽  
Author(s):  
S. Krachodnok ◽  
K.J. Haller ◽  
I.D. Williams
Keyword(s):  
Thermal Stability ◽  
Three Dimensional ◽  
Monoclinic Space Group ◽  
Tg Analysis ◽  
X Ray ◽  
X Ray Crystallography ◽  
Organic Hybrid ◽  
Dimensional Network ◽  
3D Network ◽  
Thermal Stability Of

An inorganic-organic hybrid vanadate complex, Zn2(en)V2O7 (en = ethylenediamine) has been hydrothermally synthesized and characterized by single-crystal X-ray crystallography, TG analysis, IR spectroscopy, and elemental analysis. The title compound crystallizes in the monoclinic space group P21 with a = 7.0885(7), b = 8.6040(9), c = 8.1869(8) Å, b = 112.224(2)° and V = 462.22(8) Å3, T = 298±2 K and R1[I>2s(I)] = 0.0291 for 2170 observed reflections. The structure consists of undulating sheets constructed from helical chains that share Zn coordination centers with repeating units propagated into a helix by the two-fold screw axes at 0, y, ½ and pillared with alternating VO4 tetrahedra to generate a 3D chiral network. Neighboring helices are interconnected by µ2-O bridges to form the three-dimensional network. The strength of the network is reinforced by hydrogen bonding. TG analysis shows thermal stability of the network up to 283 °C.

The Coordination Chemistry of 3,3′-Diamino-2,2′-bipyridine and Its Dication: Exploring the Role of the Amino Groups by X-ray Crystallography

2002 ◽  
Vol 2002 (8) ◽  
pp. 1985-1997 ◽  
Author(s):  
Craig R. Rice ◽  
Stuart Onions ◽  
Natalia Vidal ◽  
John D. Wallis ◽  
Maria-Cristina Senna ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Amino Groups ◽  
X Ray ◽  
X Ray Crystallography

Influence of the Crystallization Solvent on the Molecular Structures of Copper(II) Saccharinato Complexes with Pyridazine: Synthesis, X-Ray Crystallography, Spectroscopy, Photoluminescence, and Thermal Properties

2008 ◽  
Vol 61 (8) ◽  
pp. 634 ◽  
Author(s):  
Veysel T. Yilmaz ◽  
Evrim Senel ◽  
Canan Kazak
Keyword(s):  
Thermal Properties ◽  
Three Dimensional ◽  
Chain Structure ◽  
Molecular Structures ◽  
One Dimensional ◽  
X Ray ◽  
X Ray Crystallography ◽  
Reaction Solution ◽  
Strong Exchange ◽  
The Individual

X-Ray structural analysis has shown that the products of the reaction of [Cu(sac)2(H2O)4]·2H2O (sac = saccharinate) with pyridazine (pydz) are markedly dependent on the solvent used in the crystallization. The mononuclear complex [Cu(sac)2(H2O)(pydz)2] is obtained by slow evaporation of a 1:2 H2O/methanol solution at room temperature, whereas liquid-phase diffusion of diethyl ether into the same reaction solution produces the polymeric complex [Cu(μ-OH)(μ-sac)(μ-pydz)]n. The individual molecules of [Cu(sac)2(H2O)(pydz)2] are doubly bridged into dimers by O–H…O hydrogen bonds. All ligands in [Cu(sac)2(H2O)(pydz)2] are monodentate, whereas copper(ii) ions in [Cu(μ-OH)(μ-sac)(μ-pydz)]n are triply bridged by all ligands, leading to a one-dimensional chain structure, which is further assembled to form a three-dimensional framework by non-covalent π–π and CH–π stacking interactions. Complex [Cu(sac)2(H2O)(pydz)2] is paramagnetic, whereas complex [Cu(μ-OH)(μ-sac)(μ-pydz)]n exhibits a significantly low μeffective value due to very strong exchange coupling between the copper atoms with a relatively short Cu–Cu distance of 3.360(3) Å. In addition, the full spectroscopic, luminescence, and thermal properties of the complexes are reported.

scholarly journals Special Issue Editorial: Chemical Bonding in Crystals and Their Properties

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 194
Author(s):  
Anna V. Vologzhanina ◽  
Yulia V. Nelyubina
Keyword(s):  
Physicochemical Properties ◽  
Chemical Bonding ◽  
Chemical Compounds ◽  
Special Issue ◽  
Crystalline Materials ◽  
X Ray ◽  
X Ray Crystallography ◽  
Invaluable Tool ◽  
Successful Design

Relations between physicochemical properties of chemical compounds exploited in many modern applications (including optical, magnetic, electrical, mechanical, and others) and interatomic interactions that operate in their crystals are the key to the successful design of new crystalline materials, in which X-ray crystallography has proved to be an invaluable tool [...]

Ab initio structure solution and thermal stability evaluation of a new Ca(ii) 3D coordination polymer using synchrotron powder X-ray diffraction data

CrystEngComm ◽  
2017 ◽  
Vol 19 (39) ◽  
pp. 5857-5863 ◽  
Author(s):  
Fredrik Lundvall ◽  
David S. Wragg ◽  
Ponniah Vajeeston ◽  
Pascal D. C. Dietzel ◽  
Helmer Fjellvåg
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
High Resolution ◽  
Coordination Polymer ◽  
Diffraction Data ◽  
Stability Evaluation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Solution ◽  
Ab Initio Structure

A new calcium-based coordination polymer was synthesized using 4,4′-dimethoxy-3,3′-biphenyldicarboxylic acid as the linker. The thermal properties are investigated by high resolution synchrotron PXRD, TGA and DFT.

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