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Stereochemistry of transition-metal eight-coordination: the structure of tetrakis(N-benzoyl-N-phenylhydroxylaminato)hafnium(IV)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tranqui, D. Laugier, J. P. Boyer, Paul David Vulliet, P. |
| Copyright Year | 1978 |
| Abstract | Within the scope of a systematic study of eight-coordinate Hf Iv chelates, the structure of tetrakis(N-benzoylN-phenylhydroxylaminato)hafnium(IV), Hf(NBPHA) 4, has been determined by single-crystal X-ray diffraction analysis. This compound crystallizes in space group Pi of the triclinic system, with two formula units per unit cell. The dimensions of the unit cell are a = 13.363 (2), b = 13.132 (2), c = 13.015 (2) A,a = 93.66 (1), fl = 94.12 (1), ~, = 83.88 (1) °. The structure was solved with 6732 independent reflections by the heavy-atom method, and refined to an R factor of 4.6% by block-diagonal-matrix approximation. The HfO 8 coordination group is a strongly distorted dodecahedron. The eight edges, g, of this polyhedron are divided into two classes, gt and g2, with different lengths. The four bidentate NBPHA ligands span the four shorter edges, gt, in such a way that O atoms of CO and NO groups occupy the coordination sites of types X A and X B respectively. The value of the bond-length ratio Hf-OA/Hf-O n is unusually high (1.07). This d o complex may be considered as an example of a dodecahedral M(AA') 4 system whose stereochemistry can be rationalized in terms of ligand-ligand repulsions and metal-ligand n bonding (Orgel's rule). |
| Starting Page | 767 |
| Ending Page | 773 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1107/S0567740878004033 |
| Alternate Webpage(s) | http://journals.iucr.org/b/issues/1978/03/00/a15864/a15864.pdf |
| Alternate Webpage(s) | https://doi.org/10.1107/S0567740878004033 |
| Volume Number | 34 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
