artículo con referato
"Bis[(dihydrogen pyrophosphato-κ2O,O′)(2,2′:6′,2″-terpyridine-κ3N,N′,N″)copper(II)] 4.5-hydrate"
M. Perec and R. Baggio
Acta Cryst. C 67(5) (2011) m140-m144
Abstract
The title copper complex, [Cu(H2P2O7)(C15H11N3)]2·4.5H2O, consists of two very similar independent Cu(Tpy)H2P2O7 monomeric units (Tpy is 2,2′:6′,2″-terpyridine) plus four and a half water molecules of hydration, some of which are disordered. Tpy units bind through the usual triple bite via their N atoms, and the H2P2O72- anions coordinate through two O atoms from two different phosphate units. Each independent CuN3O2 chromophore can be described as a slightly deformed square pyramid, with one of them having a sixth, semicoordinated, O atom from a centrosymmetrically related CuN3O2 unit in a weakly bound second apical position suggesting an octahedral environment for the cation and weak dimerization of the molecule. The two independent complex molecules are connected via two strong O–H⋯O interactions between the phosphate groups to form hydrogen-bonded dinuclear units, further linked into [111] columns, resulting in a very complex three-dimensional supramolecular structure through a variety of classical and nonclassical hydrogen bonds, as well as π–π interactions.
DEPARTAMENTO FISICA DE LA MATERIA CONDENSADA