Syntheses, characterization and crystal structures of novel amine adducts of metal saccharinates, orotates and salicylates

Hasan Icbudak, Halis Olmez, Okan Z. Yesilel, Figen Arslan, Pance Naumov, Gligor Jovanovski, Abdul Razak Ibrahim, Anwar Usman, Hoong Kun Fun, Suchada Chantrapromma, Seik Weng Nge

Research output: Contribution to journalArticlepeer-review


Seven novel adducts of ethylenediamine (en), N,N′ -dimethylethylenediamine (dmen) and N, N-dimethylethylenediamine (ndmen) with saccharinate, orotate and salicylate as counter-ions were synthesized and characterized with physico-chemical methods (IR and UV/vis spectroscopy, magnetic susceptibility and thermoanalytical measurements) and X-ray diffraction. Reaction of dmen with tetraaquabis(saccharinato-N)copper(II) dihydrate yielded diaquabis(dmen)copper(II) saccharinate, whereas with the corresponding nickel derivative it afforded bis(dmen)bis(saccharinato-O)nickel(II). In the copper complex the coordinated water and the primary nitrogen end of the donor ligand interact with the saccharinate anion [O1 w⋯O3 = 2.833 (2), N1⋯N2 = 2.992(2) Å]. Adjacent molecules are linked by two more hydrogen bonds into a layer structure. In the nickel compound, the dmen ligand also chelates the metal atom, which is bonded to the carbonyl oxygen of the anionic group. The negatively-charged nitrogen atom of the anion is intramolecularly linked to the dmen [N1⋯N2 = 2.968(2) Å]; hydrogen bonds link the molecules into layers. Under mildly basic conditions, the reaction of orotic acid with cobalt(II) afforded tetraaqua(2,6dioxo-1,2,6-trihydropyrimidine-4-carboxylato-N,O)cobalt(II) hydrate. The complex was oxidatively reacted with en to give a mixed-ligand cobalt(III) adduct which includes both mono- and bisdeprotonated orotate ions. The metal atom in tetraaqua(2,6dioxo-1,2,6-trihydropyrimidine-4-carboxylato-N,O)cobalt(II) hydrate is chelated by the orotato dianion through the carboxyl oxygen and 3-pyrimidyl nitrogen atoms, and its octahedral geometry is completed by four water molecules. The 1-pyrimidyl nitrogen atom engages in hydrogen bonding with the lattice water molecule. The cobalt atom is similarly chelated by the orotato dianion in bis(en)(2,6-dioxo-1,2,6-trihydropyrimidine-4-carboxylato-N,O)cobalt(III) 2,6-dioxo-1,2,3,6-tetrahydropyridimi-dine-4-carboxylate pentahydrate. The copper atom in the five-coordinate aqua(en)orotatocopper(II) monohydrate is chelated by the en ligand, the deprotonated N1 pyrimidine atom and the orotate carboxylate oxygen; the water molecule completes the square-pyramidal coordination. The nickel and copper atoms in bis(en)bis(salicylato-O)nickel(II) and bis(ndmen)bis(salicy-lato-O)copper(II) monomeric octahedral complexes are coordinated by the salicylato monoanion through the carboxylate oxygen in a monodentate fashion and by the en and ndmen molecules through the two amine nitrogen atoms in a bidentate chelating manner. In the copper complex, the carboxylate oxygen atom engages in hydrogen bonding with the lattice water molecule.

Original languageEnglish (US)
Pages (from-to)255-270
Number of pages16
JournalJournal of Molecular Structure
Issue number1-3
StatePublished - Sep 10 2003


  • Amine complexes
  • Coordination
  • Orotate
  • Saccharinate
  • Salicylate

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry


Dive into the research topics of 'Syntheses, characterization and crystal structures of novel amine adducts of metal saccharinates, orotates and salicylates'. Together they form a unique fingerprint.

Cite this