Crystal and molecular structure of the tetrachloropalladate of the dication meso-3,7-diazonia tricyclo[4.2.2.22,5]dodeca-3,7,9,11-tetraen-4,8 diamine obtained by coupling reaction of 2-aminopyridines

2-Amino-5-methylpyridinium picolinate 0.63-hydrate

“…For background to the chemistry of substituted pyridines, see: Pozharski et al (1997); Katritzky et al (1996);Navarro Ranninger et al (1985); Luque et al (1997); Qin et al (1999); Yip et al (1999); Ren et al (2002); Rivas et al (2003); Jin et al (2001); Albrecht et al (2003); Nahringbauer & Kvick (1977). For details of hydrogen bonding, see: Jeffrey & Saenger (1991); Jeffrey (1997); Scheiner (1997).…”

“…There are numerous examples of 2-amino-substituted pyridine compounds in which the 2-aminopyridines act as neutral ligands (Navarro Ranninger et al, 1985;Luque et al, 1997;Qin et al, 1999;Yip et al, 1999;Ren et al, 2002;Rivas et al, 2003) or as protonated cations (Luque et al, 1997;Jin et al, 2001;Albrecht et al, 2003). Picolinic acid (pyridine-2-carboxylic acid) is a well known terminal tryptophan metabolite (Mahler & Cordes, 1971).…”