Magnetochemische Untersuchungen. XVIII. K₂(B₂H₆) und K₂(B₂H₄(OH)₂)

The crystal structures of Sr6Mg23, SrMg4, Ba6Mg23and BaLi4

“…In many respects the Ba-Mg phase diagram, determined by Klemm & Kinkelacker (1947), Zeek (1955) and Weibke & Schmidt (1940), is similar to that of the Sr-Mg system. Except for the nonexistence of BaMg3, the Ba-Mg system duplicates the series of compounds, SrMg2, SrMg4, and SrMg9 found in the Sr-Mg system.…”

“…The investigation of the Sr-Mg phase diagram by Vosskfihler (1939), Klemm & Kinkelacker (1947) and Ray (1947) disclosed the existence of four compounds, which were assigned the formulae SrMg2, SrMgs, SrMg4 and SrMgg, and disproved the existence of the compound SrMg reported by Nowotny (1942). SrMg2 was investigated by Hellner & Laves (1943) who found the structure to be a 'Laves phase' of the C14 type.…”

Strontium and europium polynuclear units in intermetallic compounds with magnesium. Structural refinements and relationships

“…The electronegativities and, due to the electron configuration 4f 7 of the lanthanide, the metallic radii of europium and strontium have a strong resemblance. Consequently, the phase diagrams of the systems Eu/ Mg (Mfihlpfordt & Klemm, 1969) and Sr/Mg (Klemm & Dinkelacker, 1947) exh.ibit similarities. They are mainly characterized by the congruently melting compounds with MgZnE-type structure (Mfihlpfordt, 1970) and ThzNi~7-type structure (Lueken & Erassme, 1985).…”

Recent Developments in the Chemistry of the Boron Hydrides.

“…One of the most significant reactions of diborane is its interaction with amalgams of highly active metals (sodium, potassium, calcium) according to equations (42,44,50,56) such as 2Na(Hg) + B2H6 -* Na2B2H6 + (Hg) The resulting non-volatile compounds are insoluble in liquid ammonia and in the common organic solvents, and react with water; consequently the molecular formulas assigned to them are based, not upon determinations of their molecular weights, but upon their diamagnetic character (15), which rules out simpler formulas such as NaBH3. That their structure is not more complex than that of diborane is a reasonable assumption, based upon an electronic interpretation of their formation.…”

“…They are, however, hydrolyzed without difficulty to produce "hypoborates," which have been shown by x-ray studies to be identical with the hypoborates produced by the action of alkalies upon diborane (3). On the basis of its diamagnetism (15), the potassium hypoborate, which originally was formulated as KOBH3, has been assigned the structure K2(BH2OH-BH2OH) and is regarded as an hydroxyl derivative of a diborane salt. In fact, like the diborane salts, these hypoborates are powerful reducing agents: when heated in vacuo, they produce the free metals (and other products), and in solution, they reduce silver, bismuth, mercury, arsenic, and antimony salts to the free metals; with cupric salts they give "copper hydride" (36,42).…”