Metal(II) complexes of the carbonylnitronate ligands O2NCHC(O)R- (R = Ph, OMe or OEt) and X-ray structure of (DMANH)[Ni(O2NCHC(O)Ph)(3)] (DMAN = 1,8-bis(dimethylamino)naphthalene)
M. Basato et al., Metal(II) complexes of the carbonylnitronate ligands O2NCHC(O)R- (R = Ph, OMe or OEt) and X-ray structure of (DMANH)[Ni(O2NCHC(O)Ph)(3)] (DMAN = 1,8-bis(dimethylamino)naphthalene), INORG CHIM, 285(1), 1999, pp. 18-24
New coordination compounds involving carbonylnitronate ligands O2NCHC(O)R-
(R = Ph, OMe or Oft) are prepared by a synthetic procedure based on the rea
ction of a nickel(II) or palladium(II) salt with benzoylnitromethane or alk
yl nitroacetate in the presence of a deprotonating agent. The use of the pr
oton sponge 1,8-bis(dimethylamino)naphthalene (DMAN) in tetrahydrofuran aff
ords, in high yields, the anionic complexes (DMANH)[Ni(O2NCHC(O)R)(3)] as b
rilliant green solids. The benzoylnitronate complex (R = Ph) crystallises i
n a monoclinic unit cell [space group P2(1)/n, a = 13.061(2), b = 16.415(2)
, c = 17.827(2) Angstrom, beta = 102.7(2)degrees], which contains four octa
hedral anionic nickel complexes each close to a big DMANH (+) cation. One n
itronate ligand is easily replaced by two molecules of ethanol to give the
neutral complexes [Ni(O2NCHC(O)R)(2)(EtOH)(2)]. The nickel is O,O'-coordina
ted to the ligand through one carbonyl and one nitro oxygen atom. A differe
nt coordination mode, in which only the nitro group is bonded to the metal,
is, however, observed in the palladium complexes [PdCl(O2NCHC(O)R)](2) (R
= OMe, Oft). (C) 1999 Elsevier Science S.A. All rights reserved.