Single crystals interaction with nitrogen

The adsorption of nitrogen on tungsten 51) was the first nitrogen system to be studied (Fig. 12) by XPS subsequently nitrogen interaction with iron was studied (52, 53), and two distinct N(ls) peaks were observed at 80 K, one at about 405 eV and the other at 400 eV. At room temperature with both single crystals and polycrystalline iron surfaces only a single peak is... 

Single crystal X-ray analysis of the ethynyl-l,5-azastibocine 5a showed the presence of intramolecular Sb---N interaction which should be responsible for the reactivity enhancement of the ethynyl-l,5-azastibocines in Pd-catalyzed cross-coupling reactions with organic halides (see Section 14.18.11). The distance between the antimony and nitrogen atoms (2.538(4) A) corresponds to 68% of the sum of the van der Waals radii of both elements (3.74 A). In the crystal central antimony atom exhibited a pseudo-trigonal-bipyramidal structure <2003TL8589>. 

Irradiation of a single crystal of deuterated and undeuterated 6-methyl-l,2,4-triazine-3,5-dione (13) with y- or X-rays afforded radicals, the EPR spectra of which were recorded by Horak and Schoffa (71MI21901). The 19-line spectrum of the deuterated radical indicates interaction of the unpaired electron with two equivalent protons, and two non-equivalent nitrogen atoms. The EPR spectra of metastable triplet states of 6-methyl-1,2,4-triazine-3,5-dione (12) in ethylene glycol/water glass at -196 °C were recorded by Shulman and Rahn (66JCP(45)2940). It was found that the lowest triplet state is a 7r- 7r state. 

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