Preparation and molecular structure of the trans(O 6) isomer of dihydrogen (1,3-propanediamine-N,N′-diacetato-N,N′-di-3-propionato)copper(II) complex. The stereochemistry of copper(II)-edta-type complexes in relation to the structure of the ligand

• Published in: Polyhedron Vol. 15; no. 21; pp. 3761 - 3770
• Main Authors: Prelesnik, Bogdan V., Radanovic, Dušanka D., Tomic, Zoran D., Djurdjević, Predrag T., Radanović, Dušan J., Veselinovic, Dragan S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.1996
• ISSN: 0277-5387
• DOI: 10.1016/0277-5387(96)00115-5

The hexadentate complex [Cu(H 21,3-pddadp)] · 1.5H20 (1,3-pddadp = 1,3-propanediamine-N,N′-diacetate-N,N′-di-3-propionate ion) has been prepared and isolated and its molecular structure determined by the single crystal X-ray diffraction technique. The complex is a trans(O 6) isomer, in which the copper(II) ion is surrounded octahedrally by two nitrogen and four oxygen atoms of 1,3-pddadp with two protonated β-alaninate rings in trans positions. The copper atom environment is a tetragonally elongated octahedron with tetragonality ( T) 0.798. A comparison of structures of the copper(II)-edta-type complexes shows an expected variation in their stereochemistry, depending on the structure of the ligand. The 1,3-pddadp ligand encircles the Cu II ion more favourably than the edta ligand, which is capable of forming five-membered chelate rings only. Some properties of the complex are also given.