Structural, magnetic and spectroscopic characterization of two unusual end-on bis(μ-acetato/μ-nitrato) bridged copper(II) complexes with N′-[phenyl(pyridin-2-yl)methylidene]furan-2-carbohydrazide and (2E,4Z)-N,2-dimethylhepta-2,4,6-trienamide-1-phenyl-1-pyridin-2-ylmethanimine (1:1) as capping ligands

Synthesis, Structural Characterization and Hydrogen Bonding of Mono(salicylidene)carbohydrazide

“…Carbohydrazide, salicylaldehyde, methanol, DMSO-d 6 and DMF-d 7 were purchased from commercial sources and used without further purification.…”

“…NMR spectra were recorded on Bruker Avance 300 and 500 spectrometers from samples in 5 mm NMR tubes at 298 K. DMSO-d 6 Proton spectra with spectral width of 6200 Hz and a digital resolution of 0.09 Hz per point were measured with 16 scans. 13 C proton decoupled, DEPT 90 and DEPT 135 spectra with spectral widths of 18030 Hz were collected with 256 to 1024 scans.…”

“…In order to assess conformation of 1 in solution two-dimensional NOESY sequence was applied. Owing to a very low solubility of 1 in most of NMR solvents, the spectra were recorded only in DMSO-d 6 and DMF-d 7 solutions. The chemical shifts in two solvents are very similar and are given in Table 1.…”

“…5 On the other hand, their ability to bind and stabilize different metal ions in various oxidation states, not only enable their use as reagents in analytical chemistry, but also makes them exquisite compounds for the design of coordination systems with biological activity. 6 Among a variety of Schiff bases especially interesting are those derived from di-or tri-amines. These can be, by proper choice of carbonyl compounds, easily tailored for construction of multinuclear coordination systems.…”

Rapid Identification of Bioactive Carbohydrazide Reaction Products by an LC-DAD-SPE-NMR Approach

“…Furthermore, they were reported to be used as precursors in the synthesis of various nitrogen and sulphur containing heterocycles [5,6]. Owing to their ability to act as chelate ligands and stabilise metal ions in different oxidation states, carbohydrazide Schiff bases have also found applications as multitopic ligands for the targeted construction of bioactive coordination systems [7,8]. These compounds can easily be prepared by the condensation reaction between carbohydrazide and appropriate aldehyde or ketone.…”