| Autor: |
Makhaev, V. D., Borisov, A. P., Boiko, G. N., Tarasov, B. P. |
| Zdroj: |
Russian Chemical Bulletin; June 1990, Vol. 39 Issue: 6 p1081-1087, 7p |
| Abstrakt: |
Zirconium and hafnium tetrachlorides react with NaBH4, in dimethoxyethane (DME) to give [Na(DME)3][M(BH4)5]. These compounds react with Bu4NBH4 and Ph4PBH4 to give (R4E)[M(BH4)5]. Bidentate and tridentate BH4- occur in [M(BH4)5]- according to IR spectroscopy. Data from1H and1H-{11B} NMR spectra are consistent with intermolecular exchange of BH4 ligands in solutions of complexes (I)–(VI). The BH4groups and the bridging and terminal protons in each BH4 group equilibrate rapidly. Heating the complexes (I)–(VI) reduces the central atom, releases diborane, and decomposes the outer-sphere cation. The neutral borohydrides M(BH4)4, can be prepared by thermolysis of the sodium salts (I) and (II). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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