Polymeric and mixed ligand complex of cobalt(II) and 4-hydroxybenzhydrazide: Crystal structure and vibrational spectroscopy

X-ray structure and vibrational spectroscopy of a cobalt(II) complex prepared with excess of 4-hydroxybenzhydrazide

“…In contrast to previously reported [Co(H 2 O) 2 (4hbah)(-SO 4 )] n [12], the precipitation of present compound was forced by excess of the organic ligand in relation to metal salt as well as relatively low content of water in the water-methanol solvent. For complex preparation, 0.2 mmol of commercially available 4-hydroxybenzhydrazide (Aldrich) was dissolved in boiling mixture of 2.5 mL CH 3 OH and 0.5 mL H 2 O.…”

“…Despite the lower symmetry, the phases of atom displacements of most normal vibrations are the same as in corresponding modes of benzene -only displacement amplitudes are frequently different. Since the aromatic ring is located away from metal coordination center, discussed vibrations are often similar to those of pure ligand [33] or other complexes [12,33].…”

“…Among possible inorganic linkers, sulfate offers one or two coordination centers [11]. The latter mode we recently found in the Co(II) complex with 4-hydroxybenzhydrazide (4hbah), where the cis location of two cobalt-sulfate bonds resulted in helical structure of the polymer chain [12].…”

A helical coordination polymer of zinc(II), 4-hydroxybenzohydrazide and sulfate ions

“…Each helix is stabilized by six intrachain hydrogen bonds involving stronger O-HÁ Á ÁO (1.83-2.06 Å ) and weaker N-HÁ Á ÁO (2.20-2.49 Å ) interactions. The Zn II atom displays a distorted octahedral geometry formed by the 4-hydroxybenzohydrazide ligand, two water molecules and two SO 4 2À ions, which is very similar to the metal-atom environment in a previously reported Co II complex [Zasłona, Drożdżewski & Kubiak (2010). J. Mol.…”

The X-ray structures, vibrational spectroscopy and antimicrobial activity of nickel(II) complexes with 4-hydroxybenzhydrazide

“…The bond lengths and angles in three 4hbah ligands (Table 2) are similar to those reported for the 4-hydroxybenzhydrazide complexes with copper(II) [21] and cobalt(II) ions [22,23]. However, there are two subtle structural differences between these ligands.…”