Hans-Hermann Giese, T. Habereder, H. Nöth
Aug 25, 1999
Citations
0
Influential Citations
33
Citations
Journal
Inorganic Chemistry
Abstract
A series of amine solvates of LiBH4 and NaBH4 have been prepared and characterized by IR and NMR spectroscopy as well as by X-ray single-crystal structure determinations. LiBH4 crystallizes from pyridine as LiBH4·3(py), 1, in which the BH4 anion acts as a bidentate ligand. However, in the structure of LiBH4·3py*, 2 (py* = p-benzylpyridine), a tridentate BH4 group is observed. In contrast, LiBH4·2(coll), 3 (coll = 2,4,6-trimethylpyridine, collidine), possesses only a bidentate tetrahydridoborate group, while a tridentate BH4 group is present in monomeric LiBH4·PMDTA, 4 (PMDTA = pentamethyldiethylenetriamine). In contrast, NaBH4·PMDTA, 6, is dimeric in the solid state: three of the four H atoms of each BH4 group coordinate to the Na atoms; two form a double bridge to two Na atoms while the third one is bonded only to one Na center. LiBH4·TMTA, 5 (TMTA = trimethylhexahydrotriazine), is also dimeric; however, only two of the nitrogen atoms of the TMTA ligand coordinate to Li. The BH4 groups bridge the two Li...