On the Structure of the Cation N₂H with an NH ċ N Hydrogen Bond in the Monoammonia Adduct of Ammonium Iodide

Abstract

In spite of the great importance of the NH ċ N hydrogen bridge in chemistry and biochemistry, the solid‐state structure of the simplest system containing this bond, [H3NH ċ NH3]⊕, was previously unknown. Single crystal X‐ray diffraction studies on NH4I · NH3 have shown that the interaction NH 4⊕ ċ NH3 leads to the formation of the cation N2H 7⊕. The N  N distance determined by least squares refinement is 269(5) pm, somewhat shorter than the equilibrium distance of 273.1 pm calculated in 1982 by Scheiner and Harding.

Calorimetric study of ammonia sorption on H4SiW12O40

“…The only stable solid compound containing ammoniated monoammonium ion which was isolated and its X-ray structure could be investigated is iodide N 2 H 7 I. 19,20 It was obtained by Lindenberg in his study of equilibrium in the NH 4 I-NH 3 system. 19 It is easily obtained at room temperature when NH 4 I is exposed to ammonia atmosphere at 26-93 kPa.…”

Building blocks for the chemistry of perfluorinated alkoxyaluminates [Al{OC(CF3)3}4]−: simplified preparation and characterization of Li+–Cs+, Ag+, NH4+, N2H5+ and N2H7+ salts

“…[NH4(NH3)x] + (with x varying from 1 up to 10 in the gas phase 50 ). A few of the salts composed of [N2H7] + cations have been characterized structurally, which include [N2H7][CH3COO], 51 [N2H7]I, 52 [N2H7]F, 53 or the compounds containing larger phenolic anions. 54 The ion centers in…”

Nucleophilicity—Periodic Trends and Connection to Basicity

“…[40][41][42] Variations in the shape of the potential energy surface; ion/ molecule complex structure: All of the substrate molecules, CH 3 X, considered here (except for the halides) form strong hydrogen bonds to X, giving front-side complexes of the type CH 3 X···X (the charges have been omitted from the complexes for clarity). For all X, this complex is lower in potential energy than the back-side X···CH 3 X complex located en route to the S N 2 transition structure.…”