Structures of Anhydrous and Hydrated Copper(II) Hexafluoroacetylacetonate

Abstract

Crystal structure analyses are reported for anhydrous copper(II) hexafluoroacetylacetonate (Cu(hfac)(2)) and for two of its hydrates. The anhydrous compound (Cu(hfac)(2), 1: P1; at 100 K, a = 5.428(1), b = 5.849(1), c = 11.516(3) A; alpha = 81.47(2), beta = 74.57(2), gamma = 86.96(2) degrees; Z = 1) contains centrosymmetric square-planar complexes with close intermolecular Cu.F contacts. The geometry of the complex is similar to that previously reported for Cu(hfac)(2).toluene. The monoaquo compound (Cu(hfac)(2)(H(2)O), 2: P2(1)/c; at 100 K, a = 10.8300(8), b = 6.5400(6), c = 21.551(3) A; beta = 90.282(8) degrees; Z = 4) consists of square-pyramidal molecules with apical H(2)O ligands, and close-lying F atoms in the sixth coordination sites. The major difference between this structure and the two other polymorphs previously reported is the nature and direction of hydrogen bonds. The yellow-green solid formed from Cu(hfac)(2) with excess H(2)O is identified as the trihydrate. In crystalline form it is the previously unreported [trans-Cu(hfac)(2)(H(2)O)(2)].H(2)O (3: P1; at 150 K, a = 8.3899(3), b = 9.6011(3), c = 11.4852(4) A; alpha = 72.397(2), beta = 79.161(2), gamma = 87.843(2) degrees; Z = 2). There is no conclusive evidence in favor of any solid with the composition Cu(hfac)(2).2H(2)O.

Synthesis and Characterisation of the First Oxazoline Coordination Compounds Containing the Cu(F6acac)2 Unit: X-ray Diffraction Studies of Cu(kappa2-O,O'-F6acac)2(kappa1-N-Meox) and Cu(kappa2-O,O'-F6acac)2(kappa1-N-Etox)

“…[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][33][34][35] As expected, the complexes reported herein contain chelating κ 2 -O,O'-bonded F 6 acac formally anionic groups with Cu-O bond lengths which are of the typical range (1.9-2.2 Å). The oxazoline ligand, predictably N-bonded, 4,5,[7][8][9][10][11][12]31 occupies a basal position with one of the F 6 acac O-atoms occupying the formal equatorial position of an idealised square pyramidal ligand arrangement.…”

“…This copper containing starting material has been extensively studied in coordination chemistry and materials science due to its ability to coordinate a variety of N-donor ligands which includes organic radicals, heterocycles, primary amines, etc. A wide variety of structural bonding motifs [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] have been observed in the resulting coordination compounds. …”

Synthesis and Characterization of Zinc β-Diketonate Complex Extended to the Macromolecular Polymers

“…The moving from the simple complex structure to the metal-organic coordination polymeric chains also have been reported 16 . Mostly, these polymeric chains were formed by reacting of simple cobalt salts with 4,4'-bipyridine (4,4'-bipy) or pyrazine (pz) [17][18][19][20] .…”

“…Mostly, these polymeric chains were formed by reacting of simple cobalt salts with 4,4'-bipyridine (4,4'-bipy) or pyrazine (pz) [17][18][19][20] . In this respect, three isomorphus 1D-coordination polymers of [Co(OAc) 2 and [Co(acac)(pz)] n (acac = acetylacetone, pz = pyrazine) 16 polymeric chains were described. The Co atoms in these chains are coordinated in an elongated octahedral geometry with non coplanar of pyridine rings.…”

trans-Diaquabis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato-κ2 O,O′)cobalt(II) dihydrate

“…Metal complexes with hfac À ligands (hfac À = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate, C 5 HF 6 O 2 ) can occur with various numbers of aqua ligands [M(hfac) 2 (H 2 O) n ] (Maverick et al, 2002). These compounds are useful precursors of numerous complexes used in supramolecular chemistry (Horikoshi et al, 2005).…”