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Synthesis and structure of 9-(di-methyl-amino)-1,10-phenanthrolin-1-ium nitrate

Batirbay Torambetov1, Mukhammedaliy Allaniyazov1, Jamshid Ashurov2

  • 1National University of Uzbekistan named after Mirzo Ulugbek 4 University St Tashkent 100174 Uzbekistan.

Acta Crystallographica. Section E, Crystallographic Communications
|August 7, 2026
PubMed

Keywords:
1,10-phenanthrolinecrystal structurenoncovalent inter­actions

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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
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