New trivalent lanthanide complexes of phthalate-containing hydrazinium cation — preparation, and spectral and thermal studies

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].…”

“…This loss of water is supported by the weight loss in TG. The presence of lattice and coordinated water molecules has been reported earlier [7] in monohydrazinium lanthanide phthalate hydrates. The anhydrous hydrazinium metal 2,3-pyrazinedicarboxylates, then, decompose exothermically in the range 195-300°C to give the corresponding metal pyrazinecarboxylate, (M(pyzCOO)pyz (COO) 2 ) as an intermediate.…”

“…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]. The thermal reactivity of hydrazine in the complexes is also of curious due to its fueling nature.…”

Synthesis, Thermal Behaviour, XRD, and Luminescent Properties of Lighter Lanthanidethiodipropionate Hydrates Containing Aminogunidine as Neutral Ligand

“…This loss of water is supported by the weight loss in TG. The presence of lattice and coordinated water molecules has been reported [16]. After this the anhydrous compounds loss aminoguanidine exothermically around 200˚C -380˚C to form Ln 2 (tdp) 3 as an intermediate.…”

Syntheses of monodispersed SnO2and CeO2nanoparticles through the self-capping role of 2-ethylhexanoate ligands

“…8,9 In particular, for the preparation of metal oxide nanoparticles, the carboxylic acids with long chain alkyl groups are expected to act as suitable surfactants, considering their strong binding affinity towards metal oxides. 10,11 In this work we report a synthetic method for preparing SnO 2 and CeO 2 nanoparticles from 2-ethylhexanoate complexes without adding surfactant or stabilizer. When the metal carboxylates with long hydrocarbon chains, dissolved in a non-polar solvent, are heated at an elevated temperature, the carboxylate ligands will become dissociated from the central metal.…”