Polymeric copper(II) complexes with 4-formyl-3-methyl-1-phenylpyrazol-5-one hetarylhydrazones: Synthesis and crystal structures

Molecular and crystal structure of iron(III) and nickel(II) complexes with 1′-phthalazinylhydrazones of heterocyclic carbonyl compounds

“…For hydrazone HL it was previously confirmed by quantum chemical calculations and single crystal X-ray diffraction study [10,19]. The ν(C=O) absorption band at 1667 cm -1 in the IR spectrum of the H 2 L′ compound indicates a pyrazolone tautomeric form, which is also typical of other Schiff bases and hydrazones of 1-phenyl-3-methyl-4-formyl-5hydroxypyrazole [20][21][22]. By slow crystallization of the reaction product of hydrazone HL with iron(III) chloride from ethanol, a single crystal sample of complex 1 with the composition [FeL 2 ]Cl⋅H 2 O was obtained whose molecular structure is shown in Fig.…”

“…The phenyl substituents are substantially turned relative to the pyrazole rings; the dihedral angles between the mean planes are 44.35° and 49.75°. It should be noted that in hydrazones based on 4-carbonyl derivatives of 1-phenyl-3-methyl-5-hydroxypyrazole and their complexes with transition metals, the turn of the phenyl group relative to the pyrazole ring vary in a very wide range and is probably solely due to the crystal packing effects [21][22][23][24][25].…”

Edaravone-Based Mononuclear Dysprosium(III) Single-Molecule Magnets

“…Furthermore, monomeric Dy(III) metallocenes generated from anionic cyclopentadienyl (Cp) ligands 29,30 are also proved to be high-temperature SMMs with a current record TB of 80 K for [(Cp iPr5 )Dy(Cp*)][BPh4] complex where Cp iPr5 = penta-isopropylcyclopentadienyl, and Cp* = pentamethylcyclopentadienyl. 31 Moreover, a recent work from Long and co-workers reported (Cp iPr5 )2Dy2I3 complex possessing Ln-Ln bonding with a record coercive magnetic field with a lower bound of 14 tesla at 60 K. 32 Pyrazolone, a five-membered heterocycle containing two adjacent nitrogen atoms is a powerful synthon, 33 which has been exploited widely in the development of pharmaceutical chemistry 34 and coordination chemistry 35 (e. g. magnetic exchange interaction in copper(II) complexes 36,37 ).…”

“…Pyrazolone, a five-membered heterocycle containing two adjacent nitrogen atoms, is a powerful synthon, which has been exploited widely in the development of pharmaceutical chemistry and coordination chemistry (e.g., magnetic exchange interaction in copper­(II) complexes , ). Pyrazolone-based ligands and their metal complexes have been summarized in a recent comprehensive review reported by Pettinari and co-workers .…”

“…14 In particular, monomeric Dy(III) complexes designed by the CF symmetry strategy such as pentagonal bipyramidal, 15−18 hexagonal bipyramidal, 19−21 and square antiprismatic, 22,23 as well as low coordinate complexes possessing predominant bonds, 24−28 are effective routes for pursuing high effective energy barrier (U eff ) and large blocking temperature (T B ). Furthermore, monomeric Dy(III) metallocenes generated from anionic cyclopentadienyl (Cp) ligands 29,30 are also proved to be high-temperature 31 Moreover, a recent work from Long and co-workers reported a (Cp iPr5 ) 2 Dy 2 I 3 complex possessing Ln−Ln bonding with a record coercive magnetic field with a lower bound of 14 T at 60 K. 32 Pyrazolone, a five-membered heterocycle containing two adjacent nitrogen atoms, is a powerful synthon, 33 which has been exploited widely in the development of pharmaceutical chemistry 34 and coordination chemistry 35 (e.g., magnetic exchange interaction in copper(II) complexes 36,37 ). Pyrazolone-based ligands and their metal complexes have been summarized in a recent comprehensive review reported by Pettinari and co-workers.…”