Crystal structure of adducts of copper(II) acetylacetonate and hexafluoroacetylacetonate with 4-aminopyridine

(Pentane-2,4-dionato-κ2O,O′)(pyridin-2-amine-κN1)copper(II) and (pentane-2,4-dionato-κ2O,O′)(pyrimidin-2-amine-κN1)copper(II)

“…The Cu atom lies above the plane formed by four acetylacetonate O atoms, by 0.219 (1) Å in (I) and 0.174 (1) Å in (II). The Cu-N bond length is 2.3287 (17) Å in (I) and 2.3672 (19) Å in (II), significantly greater than in the above-mentioned trigonal-bipyramidal compounds [2.119 (2), 2.008 (2) and 1.978 (3) Å , respectively; Lindoy et al, 2006;Stabnikov et al, 2011]. The geometry is square pyramidal with only slight distortion.…”

“…Selected bond lengths and angles are listed in Tables 1 and 3, and are typical fordiketonate compounds (Gromilov & Baidina, 2004;Stabnikov et al, 2008;Germá n-Acacio et al, 2009). But still, the three closely related compounds (4-dimethylaminopyridine-N)bis(pentane-2,4-dionato-2 O,O 0 )copper(II), (4-aminopyridine-N)bis(pentane-2,4-dionato-2 O,O 0 )copper(II) and (4-dimethylaminopyridine-N)bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato-2 O,O 0 )copper(II) have trigonal-bipyramidal geometry (Lindoy et al, 2006;Stabnikov et al, 2011). The fifth coordination site is occupied by the additional ligand in the axial position.…”

“…The distortion of a square pyramid can be best described by the structural parameter = ( -)/60 , where and are the largest angles in the coordination sphere ( = 0 for a square-pyramid and = 1 for a trigonal bipyramid; tonates, square-pyramidal geometry is more common (Bray et al, 2007;Garibay et al, 2009) than trigonal bipyramidal. But still, the three closely related compounds (4-dimethylaminopyridine-N)bis(pentane-2,4-dionato-2 O,O 0 )copper(II), (4-aminopyridine-N)bis(pentane-2,4-dionato-2 O,O 0 )copper(II) and (4-dimethylaminopyridine-N)bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato-2 O,O 0 )copper(II) have trigonal-bipyramidal geometry (Lindoy et al, 2006;Stabnikov et al, 2011). The Cu-N bond length is 2.3287 (17) Å in (I) and 2.3672 (19) Å in (II), significantly greater than in the above-mentioned trigonal-bipyramidal compounds [2.119 (2), 2.008 (2) and 1.978 (3) Å , respectively; Lindoy et al, 2006;Stabnikov et al, 2011].…”

“…But still, the three closely related compounds (4-dimethylaminopyridine-N)bis(pentane-2,4-dionato-2 O,O 0 )copper(II), (4-aminopyridine-N)bis(pentane-2,4-dionato-2 O,O 0 )copper(II) and (4-dimethylaminopyridine-N)bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato-2 O,O 0 )copper(II) have trigonal-bipyramidal geometry (Lindoy et al, 2006;Stabnikov et al, 2011). The Cu-N bond length is 2.3287 (17) Å in (I) and 2.3672 (19) Å in (II), significantly greater than in the above-mentioned trigonal-bipyramidal compounds [2.119 (2), 2.008 (2) and 1.978 (3) Å , respectively; Lindoy et al, 2006;Stabnikov et al, 2011]. However, they are similar to those in square-pyramidal copper(II) pentane-2,4-dionate complexes with adenine (Zaworotko et al, 2009), quinoline (Jose et al, 1969) and isonicotinamide (Germá n-Acacio et al, 2009), where the bond lengths are 2.328 (5), 2.36 (1) and 2.384 (2) Å , respectively.…”