Coordination versatility of tridentate pyridyl aroylhydrazones towards iron: tracking down the elusive aroylhydrazono-based ferric spin-crossover molecular materials.

@article{Shongwe2012CoordinationVO,
  title={Coordination versatility of tridentate pyridyl aroylhydrazones towards iron: tracking down the elusive aroylhydrazono-based ferric spin-crossover molecular materials.},
  author={M. S. Shongwe and Sumaiya H Al-Rahbi and Mariam Al-Azani and Abdulaziz A Al-Muharbi and F. Al-Mjeni and D. Matoga and A. Gismelseed and I. Al-Omari and A. Yousif and C. Adams and M. J. Morris and M. Mikuriya},
  journal={Dalton transactions},
  year={2012},
  volume={41 8},
  pages={
          2500-14
        }
}
The two potentially tridentate and monoprotic Schiff bases acetylpyridine benzoylhydrazone (HL(1)) and acetylpyridine 4-tert-butylbenzoylhydrazone (HL(2)) demonstrate remarkable coordination versatility towards iron on account of their propensity to undergo tautomeric transformations as imposed by the metal centre. Each of the pyridyl aroylhydrazone ligands complexes with the ferrous or ferric ion under strictly controlled reaction conditions to afford three six-coordinate mononuclear compounds… Expand
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References

SHOWING 1-10 OF 106 REFERENCES
Carbonyl rhodium(I) complexes containing a hydrazonic tridentate HNN′O ligand. Synthesis, X-ray structure and reactivity toward methyl iodide
The ligand (2-pyridinecarboxaldehyde) benzoylhydrazone ( HNN′O ) has been reacted with [Rh 2 (μ-Cl) 2 (CO) 4 ] in diethyl ether, isolating the carbonyl complex [Rh(κ 2 -HNN′)(CO)Cl] ( 1 ), where theExpand
Mononuclear Pervanadyl (VO2+) Complexes with Tridentate Schiff Bases: Self-assemblingvia C-H…oxo and π-π Interactions
Pervanadyl (VO2+) complexes with N-(aroyl)-N′-(picolinylidene)hydrazines (HL = Hpabh, Hpath and Hpadh; H stands for the dissociable amide hydrogen) are described. The Schiff bases were obtained byExpand
Iron catalysed assembly of an asymmetric mixed-ligand triple helicate.
The 2-pyridinecarbaldehyde isonicotinoyl hydrazone (HPCIH) family of ligands are typically tridentate N,N,O chelators that exhibit very high in vitro activity in mobilizing intracellular Fe and areExpand
Ruthenium(II) complexes containing RuN4O2 spheres assembled via pyridine-imine-amide coordination. Syntheses, structures, properties and protonation behaviour of coordinated amide
A series of ruthenium(II) complexes of general formula [RuL2] with the pyridine-N, the imine-N and the amide-O donor N-(aroyl)-N′-(picolinylidene)hydrazines (HL) has been synthesized. The ligandsExpand
Pseudohalide-induced structural variations in hydrazone-based metal complexes: Syntheses, electrochemical studies and structural aspects
The effects of pseudohalides on the modes of binding of a hydrazone ligand are investigated and we report here four new hydrazone complexes [Co(L) 2 ] · ClO 4 ( 1 ), [Co(L) 2 ] 2 [Co(SCN) 4 ] ( 2 ),Expand
Iron chelators of the dipyridylketone thiosemicarbazone class: precomplexation and transmetalation effects on anticancer activity.
TLDR
The divalent Mn(II), Ni, Cu, and Zn(II) complexes of the HDpT analogues are equally active in preventing proliferation as their ligands, suggesting the complexes act as lipophilic vehicles facilitating intracellular delivery of the free ligand upon metal dissociation. Expand
Iron(III) complexes with a biologically relevant aroylhydrazone: crystallographic evidence for coordination versatility.
TLDR
A synthetic and crystallographic demonstration of the coordination versatility of an aroylhydrazone toward iron is uncommon. Expand
Stepwise Spin Transition in a Mononuclear Iron(II) Complex with Unusually Wide Plateau
The reaction of the Schiff-base like ligand H2L [L2– = (E,E)-({diethyl 2,2′-[1,2-phenylenebis(iminomethylidyne)]bis(3-oxobutanato)})] with iron(II) acetate in methanol in the presence ofExpand
SYNTHESIS, STRUCTURE AND PROPERTIES OF MANGANESE(II) COMPLEXES WITH AROYLHYDRAZONES OF 2-PYRIDINE-CARBOXALDEHYDE
Abstract Manganese(II) complexes of terdentate N,N,0 donor Schiff bases (HL) are described. The ligands Hpabh, Hpamh and Hpadh are obtained by condensing 2-pyridine-carboxaldehyde with benzhydrazide,Expand
Dioxouranium Complexes with Acetylpyridine Benzoylhydrazones and Related Ligands
Acetylpyridine benzoylhydrazone and related ligands react with common dioxouranium(VI) compounds such as uranyl nitrate or [NBu4]2[UO2Cl4] to form air-stable complexes. Reactions with 2,Expand
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