2-Aminopyridinium maleate: A structural study

✍ Scribed by R. Chitra; Pascal Roussel; Fredric Capet; Chitra Murli; R.R. Choudhury

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 550 KB
• Volume: 891
• Category: Article
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2008.03.014

✦ Synopsis

A new complex of 2-aminopyridine and maleate in 1:1 stoichiometric ratio was obtained. The complex crystallizes in non-centrosymmetric space group Pc. This complex is held by network of hydrogen bonding between the protonated 2-aminopyridinium cation and maleate anion and also by pi-pi stacking. There is no phase transition observed in this complex, which has been verified using DSC and single crystal X-ray measurement studies. A comparison between 2-aminopyridinium maleate and bis(2-aminopyridinium) maleate structure shows that the positive charge resides on the ring nitrogen in the present complex unlike the case in bis(2-aminopyridinium) maleate where the charge is on the amino nitrogen. This complex has higher meting point compared to that of bis(2-aminopyridinium) maleate which is due to the difference in hydrogen bonding pattern between the two complexes.