The crystal structure of cobalt(II) bisacetylacetone dihydrate

Abstract

Intensities of (hO1), (h/CO) and (Mcl) reflexions were estimated visually from Weissenberg photographs taken using MoK radiation. To obtain a range of intensity for each reflexion, instead of the usual method of interleaving films with metal foil, films of different speeds (Ilford Industrial G and B) were used (Iball, 1954). Reflexions were observed to a sin 0 limit of 0.59. Roughly equidimensional crystals of side 0.3 mm. were used and, within this range of sin 0,

Synthesis and Structural Studies of Two New Base Adducts of Bis(2,4‐pentanedionato)cobalt(II)

“…complexes with L ϭ pyridine, [5] 6-methylquinoline [4] and 2-aminopyridine, [6] but are longer than those observed for other Co II complexes with 3,5-dimethylpyrazole. [15,16] The most interesting feature of the crystal structure of 1 is the presence of hydrogen bonds that may play an important role in the stabilisation of the cis configuration of the monodentate ligands.…”

“…Compound 2 has a similar absorption spectrum with two main bands, one at 1125 nm and the other at 502 nm. These two bands correspond to the 4 T 1g (F)Ǟ 4 T 2g (F) and 4 T 1g (F)Ǟ 4 T 1g (P) transitions. The multiple structure of the band near 500 nm arises from a number of effects, but primarily from the admixture of spinforbidden transitions to doublet states mainly derived from 2 G and 2 H. [14] Study of the complexation reaction that occurs upon adding Hdmpz or Hdmea to [Co(acac) 2 2 (Hdmea)] are formed, irrespective of the nature of the solvent used.…”

“…( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004) quinoline, imidazole and 2-aminopyridine) were also prepared and their crystal structures reported. [4Ϫ7] With water as the donor molecule, two intermediate products were isolated: [Co(acac) 2 [8,9] The crystal structures of both are derived from that of the tetrameric complex [Co(acac) 2 ] 4 .…”

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.…”