Experimental and computational evidence of solid-state anion-pi and pi-pi interactions in [VO(O-2)(L)(pa)]center dot xH(2)O complexes (L = picolinate, pyrazinate or quinolinate; pa = picolinamide)
2009
Abstract
Two new neutral monoperoxidovanadium(V) complexes [VO(O-2)(L)(pa)]center dot xH(2)O have been synthesized: [VO(O-2)(pic)(pa)]center dot H2O (1) and [VO(O-2)(Hquin)(pa)]center dot 2H(2)O (2) [pic: pyridine-2-carboxylato(1-) or picolinato(1-), Hquin: pyridine-2,3-dicarboxylato(1-) or quinolinato(1-), and pa: picolinamide]. The solid state structures of 1 and 2 feature a typical distorted pentagonal bipyramid coordination polyhedron around the central vanadium atoms.
The bidentate anionic ligands are coordinated in two equatorial positions, while the bidentate picolinamide molecule is bound via the aromatic nitrogen and the carboxamide oxygen in one equatorial and one apical position.