Nitrogen fundamental properties

Some of the fundamental properties of sulfur, selenium and tellurium differ significantly from those of oxygen, giving rise to disparities between the structures and properties of heavier chalcogen-nitrogen molecules and ions compared to those of their N-O counterparts. The major contributors to these differences include the following ... 

The fundamental property of the ions obtained from the PC is the electrical mobility of the macroions in nitrogen at atmospheric pressure. To a first approximation the mobility should be directly proportional to... 

The ambivalence of an unsubstituted azomethine ylid is generally accepted as a fundamental property of 1,3-dipoles, though it had never been shown by any experimental work until reports affording clear evidence were published.411-413 Both employed the silyl procedure, and precursors in which one carbon a- to nitrogen was distinguished from the other. 

In their fundamental properties—basuity and the accompanying nucletheir reactions, however, the final products depend upon the numoer of hydrogen atoms attached to the nitrogen atom, and hence are different for amines of different classes. 

In summary, NO Os can be formed via totally different paths with different starting nitrogen oxides. However, unambiguous interpretation of the structure, stability and transformation mechanism involving this peculiar ionic species is unavailable. Therefore, comprehensive experimental means, including x-ray diffraction measurement, Raman and Infrared spectroscopy were employed to understand the fundamental properties of NO Os synthesized via the last path mentioned above. While the diffraction measurements established the P-V equation of state, the optical spectra, especially the low-temperature Raman data, elucidate important aspects of the transformation, thermodynamic properties, and stability diagram of NO Os. ... 

The bulk of enamine studies since Stork s original publication have focused on establishing the breadth and limitations of individual substitution reactions and on extending the list of useful electrophiles. In addition, auxiliary studies have enriched our knowledge about the ambident nature of the vinyl nitrogen system, stereoelectronic factors governing its reactivity, its stability and spectroscopic properties. An increasing number of synthetic applications of these fundamental studies can be expected in future years. 

The study of open-chain polyphosphazenes has attracted Increasing attention In recent years, both from the standpoint of fundamental research and technological development. The polyphosphazenes are long chains of alternating phosphorus-nitrogen atoms with two substituents attached to phosphorus. These polymers have been the subject of several recent reviews (1-3). Interest has stemmed from the continuing search for polymers with improved properties for existing applications as well as for new polymers with novel properties. 

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