A novel hybrid terpyridine?pyrimidine ligand and the supramolecular structures of two of its complexes with Zn(II) and acetylacetonato: The underlying role of non-covalent p  p contacts and C?H  X(O, N, p) hydrogen bonds

JUAN GRANIFO; RUBEN GAVIÑO; ELEONORA FREIRE; RICARDO BAGGIO

JOURNAL OF MOLECULAR STRUCTURE

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2014 vol. 1063 p. 102 - 108

0022-2860

The novel 40-[4-(pyrimidin-5-yl)phenyl]-4,40:60,200-terpyridine (L1) ligand reacts with Zn(acac)2 (acac = acetylacetonato) to give the monomeric complex [Zn(acac)2(L1)2] (1) and the coordination polymer [Zn(acac)2(l-L1)]n (2). The structure of 1 consists of a Zn(II) cation sitting on an inversion centre, surrounded by a slightly elongated octahedral environment, defined by two trans N(4-pyridyl) atoms from a pair of mondentate L1 ligands, and four O atoms from two chelating acac anions. The polymeric structure of 2 presents a similar though non-symmetric Zn(acac)2 unit, since the two coordinated N atoms come from two different donor moieties of L1: the 4-pyridyl and the pyrimidinyl. Both compounds present weak C?H  N contacts generating 2D aromatic structures, complemented by p  p contacts plane-stacking giving raise to 3D structures and further stabilized by C?H  O and C?H  p interactions.