Reactivity, molecular structure and

Four nitrosamines, seven nitramines, three nitroesters and the explosives Semtex 10 and Composition B have been investigated by TGA. Linear dependence was confirmed between the position of the TGA onsets, as defined in the sense of Perkin-Elmer s TGA-7 standard program, and the samples weights. The slope of this dependence is closely related to the thermal reactivity and molecular structure. The intercept values of the dependence correlate with the autoignition temperatures and with the critical temperatures of the studied compounds, without any clear influence from molecular structure. Results show that Semtex 10 exhibits approximately the same thermostability as its active component pentaerythrityl tetranitrate (PETN, 274). Results also show that TGA data for Composition B do not correlate with analogous data for pure nitramines564. 

Synthesis, Reactivity, and Molecular Structure of Diphosphadisilacyclobutanes, Bis(stannyl)silyl-, and Bis(stannyl)germylphosphines... 

Hendrickson, J. B. Cram, D. J. Hammond, G. S. Chemical Reactivity and Molecular Structure. In Organic Chemistry, 3rd ed. McGraw-Hill New York, 1970, pp 304-307. 

Correlation between Chemical Reactivity and Molecular Structure (or Electronic State)... 

P. Schreck, C. Vix-Guterl, P. Ehrburger and J. Lahaye, Reactivity and molecular structure of silicon carbide fibres derived from polycarbosilanes. Part II XPS-analysis, J. Mater. Sci., 27,4243-46 (1992). 

Modeling the chemical bond is certainty a major key for describing the chemical reactivity and molecular structures stability. Yet, since the chemical bond is a dynamic state, for the best assessment of its connection with the stability and reactivity, the pre- and post-bonding stages are naturally considered the present discussion follows (Putz, 2010a). 

In comparisons of muons with protons and of muonium with hydrogen atoms, pronounced quantum effects occur whenever dynamics are involved. In this way, muons have been utilized to probe a large variety of properties and materials insulators, semiconductors, metals, superconductors, insulators, gases, liquids, crystalline and amorphous solids, static and dynamic magnetic properties of all kinds, electron mobility, quantum diffusion, chemical reactivity and molecular structure and dynamics. The term adopted for the broad field of muon spin spectroscopy techniques, fiSR, emphasizes the analogy with other types of magnetic resonance for example EPR. juS represents muon spin , and R in a more general sense stands simultaneously for rotation , relaxation and resonance . 

Spectroscopic methods such as IR and Raman have proven to be exceptionally powerful methods for solving many chemistry problems . However, the vibrational assignment, as well as the understanding of the relationship between the observed spectral features and molecular structure or reactivity of the sample, can be very difficult. Theoretical methods can certainly assist to obtain a deeper understanding of the vibrational spectra of new compounds. These are the well-established force field calculations, semi-empirical and ab initio methods . 

The field has grown from a primarily synthetic exploratory stage to a more sophisticated stage where extensive studies of reactivities, electron structures, and molecular structures are vigorously pursued. 

The studies of e aq reactivity have shown results consistent with the accepted theories on atomic and molecular structure and on chemical reactivity. In the years to come, it is hoped that confidence in the e aq reaction as a diagnostic tool in the methodology of chemistry will grow and e aq will become a common reagent in the laboratories of both the inorganic and the organic chemists. 

Following the approach pioneered by Bllrgi and Ounitz (80, 96), Jones and Kirby (97) further discovered a linear relationship between bond length and reactivity. They first determined crystal and molecular structures for a series of 2-substituted aryloxytetrahydropyran derivatives (98-101). 

Priebsch, W. and D. Rehder. 1990. Oxovanadium alkoxides Structure, reactivity, and 51-V NMR characteristics. Crystal and molecular structures of VO(OCH2CH2Cl)3 and V0C12(THF)2H20. Inorg. Chem. 29 3013-3019. 

Negrel, J. C., Gony, M., Chanon, M., Lai, R. Reactivity of copper metal vapors with substituted bromobenzenes. Formation and molecular structure of Cu(PMe3)3Br. Inorg. Chim. Acta 1993, 207, 59-63. 

The main focus of this chapter is on two well-studied series of photochromic compounds, spiropyrans and spirooxazines, and the comparison of their photo-reactive excited states and molecular structures. The discussion of their photodegradation takes into account the results obtained from spectrophotometric measurements together with the identification of the fragments resulting from photodegradation. Different mechanisms are proposed for the photooxidation reaction. The experimental apparatus and procedures for photodegradation studies are also described. 

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