2-Amino-3-methylpyridinium, 2-amino-4-methylbenzothiazolium and 2-amino-5-chloropyridinium salts. experimental and theoretical findings - Hanif, Muhammad; Khan, Ezzat; Tahir, Muhammad Nawaz; Morais, Sara Figueirêdo de Alcântara; Braga, Ataualpa Albert Carmo (Journal of Molecular Structure, 2020)