The crystal structure of diaquobisacetylacetonatonickel(II)

Abstract

Bullen (1959) has reported the crystal structure of diaquobisacetylacetonatocobalt(II), Co(C5H~02)2.2H20. Cell dimensions and general distribution of intensities in the diffraction patterns indicate that the corresponding nickel compound has essentially the same structure. Because of our interest in the coordination polyhedra of transition metal ions, we have determined the crystal structure of diaquobisacetylacetonatonickel(II).The unit cell has dimensions a=10.954±0-01, b=5.361_+0.006, c=11.245±0.01 A; fl = 106 ° 48' ± 9', and contains two molecules. The space group is P21/c.The structure was refined finally to R=0.07 by threedimensional least squares on the IBM 709 computer, using 937 independent reflections from integrated equiinclination Weissenberg photographs, hOl through h31, taken with Cu Ka radiation.

Thermochemistry, singlet–triplet gap and crystal structure of (tetramethylethylenediamine)nickelbis(acetylacetonate) [(TMEDA)Ni(acac)2]

“…28 A) distances are in good agreement with data from an earlier electron diffraction experiment (Ni-O: 1.876 (7) A; O-C: 1.273(7) A) [21]. To model the crossover from the square-planar to an octahedral geometry, trans-Ni(acac) 2 (H 2 O) 2 (10)) [22]. The coordination of two water molecules is exergonic by )6.1 kcal/mol.…”

Investigations of alkaline-earth β-diketone complexes. I. The crystal and molecular structure of bis(dimethylformamido)bis(1,3-diphenyl-1,3-propanedionato)magnesium

“…diaquobis(acetylacetonato)magnesium, Mg(AA)2(H20)2 (Morosin, 1967), Co(AA)2(H20)2 (Bullen, 1959), and Ni(AA)2(H20)2 (Montgomery & Lingafelter, 1964). In each case, the divalent metal cation is octahedrally coordinated by two fl-diketone ligands and two solvent molecules in a monomeric unit.…”

Structure of cis-diaquabis(hexafluoroacetylacetonato)nickel(II)

“…Notable exceptions include the anhydrous bis(acetylacetonato) Co I~, Ni I~ and Zn II complexes which possess oligomeric structures with bridging acac groups. The structures of the trans-diaquabis(acetylacetonato) complexes of both Co II and Ni ~ have been previously described (Bullen, 1959;Montgomery & Lingafelter, 1964) and the preparation of trans-Ni(F6acac)2(H20)2 has been * To whom correspondence should be addressed.…”