Dinicotinamidium squarate

Bulut A., YEŞİLEL O. Z. , Dege N., Icbudak H., Olmez H., Buyukgungor O.

ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY, cilt.59, 2003 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 59
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1107/s0108270103025903


The crystal structure determination of the dinicotinamidium squarate salt, 2C(6)H(7)N(2)O(+).C4O42-, is reported, with the squarate dianion residing on an inversion centre and the unique cation in a general position. Salt formation occurs by donation of two H atoms from squaric acid to the nicotinamide base. The crystal packing is derived from three types of hydrogen bonding. The primary hydrogen bond involves a squarate anion O atom and an H atom of the protonated pyridine group of the nicotinamide, with an N...O distance of 2.5760 (13) Angstrom. The second hydrogen bond involves a second anion O atom and an amide H atom, with an N...O distance of 2.8374 (14) Angstrom. Thirdly, an intermolecular interaction between two coplanar nicotinamide moieties occurs between an amide O atom and a symmetry-related amide H atom, with an N1...O3 distance of 2.8911 (15) Angstrom. These hydrogen bonds are also responsible for the planarity of the nicotinamide moiety in the salt.