Hydrazinium as a ligand: structural, thermal, spectroscopic, and magnetic studies of hydrazinium lanthanide di-sulphate monohydrates; crystal structure of the neodymium compound

Abstract

Hydrazinium lanthanide complexes of formula N,H,Ln(SO,),-H,O, where Ln = La, Ce, Pr, Nd, or Sm, have been prepared and investigated by means of i.r. and electronic spectroscopy, thermal analysis, and magnetic susceptibility measurements. The crystal structure of the neodymium compound has been determined by conventional Patterson and Fourier methods and refined by fullmatrix least squares t o an R of 0.059 for 2 427 independent reflections. The t w o independent neodymium atoms in the asymmetric unit are nine-co-ordinated by seven sulphate oxygen atoms, one water molecule, and one nitrogen atom of the N, H, + ion. The co-ordination polyhedron in both the cases is a distorted tricapped trigonal prism. The sulphate groups are present as bridging ligands among three metal atoms. Powder patterns indicate isomorphism of the above series of compounds.

Synthesis and spectroscopic, thermal, and XRD studies on trivalent lighter rare-earth complexes of 2,3-pyrazinedicorboxylate with hydrazinium cation

“…2 G 7=2 ; 4 G 5=2 transitions of Nd 3þ is known to exhibit strong hypersensitive behaviour [16], making it especially suitable for probing the coordination environment around the Nd 3þ ion. The spectral profiles (Table 1) of the above transition (solid state) in the present Nd 3þ complex resemble those of the nine-coordinated complexes [4,7,17,18]. All the parameters viz., b, b 1=2 , %, d and g (vide Table 1) suggest a weak covalent interaction between lanthanide metal and ligand [18].…”

“…Among the known cationic polyamine ligands the hydrazinium(+1) cation, (N 2 H þ 5 ) is unique since the site of positive charge is immediately adjacent to the N-donor atom. This has also been established by single crystal X-ray studies on N 2 H þ 5 containing complexes [4,5], and in some cases N 2 H þ 5 ion is not coordinated to the metal but remains ionic like NH þ 4 , K þ and Na þ as the charge-compensating cations outside the anionic complex coordination sphere [6]. There has been a significant amount of interest in the chemistry of rare-earth complexes of hydrazine with the carboxylic acid due to their use as precursors for fine particle metal oxides [7,8].…”

Facile synthesis of hierarchically structured NiO flower-like hollow spheres

“…The first one (100-330 C, 10.4% mass loss) corresponds to the dehydration of the nickel-citrate precursors. [25] The sharp mass loss observed in the range of 330 CÀ420 C (38.9% mass loss) is due to the combustion of the organic ligand. [26] The precursor is annealed at 400 C for 2h in air, and the resultant product was characterised using SEM and XRD.…”

Acetate and malonate complexes of cobalt(II), nickel(II) and zinc(II) with hydrazinium cation

“…Despite a large number of hydrazinium metal complexes are known with a variety of anions such as fluoride [1,2], chloride [3][4][5], thiocyanate [6], sulfate [7,8] and hydrazidocarboxylate [9,10], similar complexes with aliphatic carboxylates as anions are rare, except a few [11][12][13][14][15][16]. In most of the cases the bis-or tris-hydrazine metal carboxylates are precipitated instead of hydrazinium complexes.…”