Structural study of zirconium and hafnium oxoalkoxides

Starikova, Z. A.; Turevskaya, E. P.; Kozlova, N. I.; Turova, Nataliya; Berdyev, D. V.; Yanovsky, A.I.

doi:10.1016/s0277-5387(98)00364-7

Cited by 38 publications

(35 citation statements)

References 17 publications

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“…The structure of Hf(O i Pr) 4 -(HO i Pr) is similar to the solid Zr(O i Pr) 4 (HO i Pr) 4 analog. 28 The hexamer Hf 6 O 2 (OEt) 20 (EtOH) 2 (4) 29 shows an average Hf coordination number of 2.7 at a distance of 3.45 A ˚and an octahedral oxygen coordination, with average distances of c The reference compounds serve as model for the hafnium framework, and some changes to the oxygen coordination of the references were applied to obtain the deduced model structures in order to mirror the experimental data, e.g. the coordination of an additional neutral ROH ligand.…”

Section: Structures Of Solid State Referencesmentioning

confidence: 99%

The structures of the precursor Hf(OnBu)4 and its modification in solution: EXAFS-investigation in combination with XANES- and IR-spectroscopy

2007

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Section: Structures Of Solid State Referencesmentioning

confidence: 99%

The structures of the precursor Hf(OnBu)4 and its modification in solution: EXAFS-investigation in combination with XANES- and IR-spectroscopy

2007

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“…3a). Trinuclear cores of Hf 4+ ions are common in inorganic complexes containing alkoxide, aryloxide, hydroxide and oxide ligands 17,18 . All three metal atoms are well ordered in the crystal.…”

Section: Trinuclear Clustermentioning

confidence: 99%

A novel protein–mineral interface

Alexeev

Zhu

Guo

et al. 2003

Nat Struct Mol Biol

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Transferrins transport Fe3+ and other metal ions in mononuclear-binding sites. We present the first evidence that a member of the transferrin superfamily is able to recognize multi-nuclear oxo-metal clusters, small mineral fragments that are the most abundant forms of many metals in the environment. We show that the ferric ion-binding protein from Neisseria gonorrhoeae (nFbp) readily binds clusters of Fe3+, Ti4+, Zr4+ or Hf4+ in solution. The 1.7 A resolution crystal structure of Hf-nFbp reveals three distinct types of clusters in an open, positively charged cleft between two hinged protein domains. A di-tyrosyl cluster nucleation motif (Tyr195-Tyr196) is situated at the bottom of this cleft and binds either a trinuclear oxo-Hf cluster, which is capped by phosphate, or a pentanuclear cluster, which in turn can be capped with phosphate. This first high-resolution structure of a protein-mineral interface suggests a novel metal-uptake mechanism and provides a model for protein-mediated mineralization/dissimilation, which plays a critical role in geochemical processes.

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“…Oxoalkoxides with this structural motif were already characterized by single crystal X-ray crystallography and show Zr-Zr distances of 3.22 Å. 18, 19 A partly carboxylate-substituted trinuclear Zr compound is also known, in which longer (3.86 Å) and shorter Zr-Zr distances (3.37, 3.41 Å) were observed, depending on the bridging ligands. 20 Additionally, a cluster with the Zr 3 (µ 3 -O) unit was the product of a reaction of Zr(OPr) 4 with 2,4-dimethylpentane-2,4-diol.…”

Section: Exafs Resultsmentioning

confidence: 99%