Crystal structure hydrazine salts

X-ray crystal structures have been obtained for them and the nitrogen-nitrogen distance decreases with successive oxidation. When 1,5-diazabi-cyclo[3.3.0]octane is reacted with 3-bromo-1-propanol, followed by reaction with 40% HBF4, the hydrazinium dication (197) is obtained in 80% yield (eq 51).93b The 13C labeled hydrazinium dication (198) was prepared through double alkylation of tetramethyl hydrazine, the second alkylation being assisted by the silver (I) salt (eq 52)93c... 

Hydrazine hydrate dissolves many inorganic salts readily most of these salts recrystallize from the solution to form stable solvates or adducts that do not dissolve further. Additionally, the reaction of hydrazine with mineral adds/organic acids also leads to the formation of crystalline solids. These colored compounds are mostly single crystals although polycrystalline products can also be obtained. In metal complexes, hydrazine appears as either singly or doubly protonated cation and plays an important role in forming various hydrogen bond networks in their derivatives. For this reason, it is of interest to determine their crystal structures. 

X-Ray crystallographic analysis has been extensively used to determine the configuration of such crystalline compounds [36]. Most hydrazine derivatives are characterized by their single-crystal structures, as already mentioned in the respective Sections 1.2.1-1.2.4 on hydrazine salts and metal complexes. Chapter 5 will deal further with the single-crystal characterization of many inorganic hydrazine derivatives. 

Common synthetic methods practiced for the preparation of metal hydrazines, and some single-crystal structures, are discussed briefly in Chapter 1. A direct method of synthesis of metal hydrazines has been developed that involves adding metal powders to hydrazine salts (preparation of salts discussed in Chapter 2). Details of the synthesis of several simple and mixed metal hydrazines by this and other methods, along with their spectral characterization and thermal reactivity, are now described. 

Only the lithium salt of a tris(trimethylsilyl)hydrazine 76 is described.35,40 It crystallizes as a dimer via a Li—N bond in a ladder structure, forming a tricyclic system with one (LiN)2 four-membered ring and two LiN2 three-... 

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