Picolinamidium squarate and di-p-toluidinium squarate dihydrate

Ucar I., Bulut A., YEŞİLEL O. Z., Buyukgungor O.

ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY, cilt.60, 2004 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 60
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1107/s0108270104013964
  • Dergi Adı: ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chimica, Compendex, EMBASE, INSPEC, MEDLINE
  • Eskişehir Osmangazi Üniversitesi Adresli: Hayır

Özet

The crystal structure determinations of picolinamidium squarate, C6H7N2O+.C4O4-, (I), and di-p-toluidinium squarate dihydrate, 2C(7)H(10)N(+).C4O4 (2-).2H(2)O, (II), are reported. While salt formation occurs by donation of one H atom from squaric acid to the picolinamide molecule in ( I), in compound ( II), each squaric acid molecule donates one H atom to the p-toluidine N atom of two trans p-toluidine molecules. In ( I), the pyridine ring is coplanar with the squarate monoanion through imposed crystallographic mirror symmetry; in ( II), the dihedral angle between the p-toluidine moiety and the squarate dianion is 70.71 (1)degrees. In (I), a three-dimensional structure is formed via van der Waals interactions between parallel planes of molecules, with hydrogen-bond interactions (N-H...O and O-H...O) acting within the planes; hydrogen bonds form a three-dimensional network in ( II).