摘要:
A method of purifying ammonia borane is provided whereby crude ammonia borane is dissolved in a basic aqueous solution, the solution is heated to decompose and precipitate impurities found in the crude ammonia borane, and the impurities are separated by filtration. The aqueous solution containing dissolved ammonia borane is then cooled to a temperature of from 10° C. to −10° C., to precipitate the ammonia borane, which is recovered and dried to yield a high-purity product.
摘要:
Described are nonlinear optical (NLO) crystals, including aluminum-borate NLO crystals, that have low concentrations of contaminants that adversely affect the NLO crystal's optical properties, such as compounds that contain transition-metal elements and/or lanthanides, other than yttrium, lanthanum, and lutetium. Some NLO crystals with low concentrations of these contaminants are capable of second harmonic generation at very short wavelengths. Also described are embodiments of a method for making these NLO crystals. Some embodiments involve growing a single NLO crystal, such as an aluminum-borate NLO crystal, from a mixture containing a solvent that is substantially free of harmful contaminants. The described NLO crystals can be used, for example, in laser devices.
摘要:
Disclosed is a method for the preparation of decaborane-14(B.sub.10 H.sub) in high yields from B.sub.5 H.sub.9 which involve three basic procedure steps as follows:(1) conversion of B.sub.5 H.sub.9 to a solid, [N(CH.sub.3).sub.4 ][B.sub.9 H.sub.14 ], by reacting NaH in a tetrahydrofuran (THF) solution in the presence of [N(CH.sub.3).sub.4 ][Cl];(2) performing a hydride abstraction on the solid after removal of THF by reacting, while stirring, a boron trihalide selected from BBr.sub.3 and BCl.sub.3 to form B.sub.10 H.sub.14 ; and,(3) separating the B.sub.10 H.sub.14 from the solid reaction mixture by a sublimation procedure.
摘要:
Tetradecahydroundecaborate compounds, MB.sub.11 H.sub.14, wherein M represents a monovalent cation are prepared by the reaction of the corresponding octahydroborate compounds, MB.sub.3 H.sub.8, with boron trifluoride. The reaction is carried out at a temperature of 100.degree. C. to 120.degree. C., preferably in an inert solvent medium.
摘要:
This invention relates to the preparation of dodecahydrododecaborate (2-) anions and particularly to the preparation of alkali metal dodecahydrododecaborates such as Na.sub.2 B.sub.12 H.sub.12. The process of the invention involves the reaction of an alkali metal borohydride with dimethylsulfideborane, at a temperature and for a time sufficient, to yield the alkali metal dodecahydrododecaborate. The reaction may be conducted at atmospheric pressure.
摘要翻译:本发明涉及十二氢十二硼酸盐(2-)阴离子的制备,特别涉及制备碱金属十二氢十二硼酸盐如Na 2 B 12 H 12。 本发明的方法涉及碱金属硼氢化物与二甲基硫代硼烷的反应,温度和时间足以产生十二烷基十二硼酸碱金属。 该反应可以在大气压下进行。
摘要:
A cubic compound may comprise thorium borate or, in the alternative cerium borate, and may possess a porous supertetrahedral cationic framework with extraframework borate anions. These anions are readily exchanged with a variety of environmental contaminants, especially those from the nuclear industry, including chromate and pertechnetate.
摘要:
The invention provides new methods for synthesis of large boron hydride clusters, e.g., boron hydride molecules of the formula BnHm where 5≦n≦96 and m≦n+8, wherein m and n satisfy the electron counting rules of macropolyhedral boranes. The invention is particularly useful for synthesis of octadecaborane (B18H22). Preferred methods of the invention include iteratively generating a conjugate acid from a salt of the [BaHb]c− or [Bn+2Hm−4]2− anion followed by degradation under conditions conducive to concentrating and drying of the conjugate acid to provide a borane BnHm and residual salt of the [BaHb]c− or [Bn+2Hm−4]2− anion which is reused in the method of synthesis. The invention further provides isotopically enriched boranes, particularly isotopically enriched 10B18H22 and 11B18H22.
摘要:
Described are nonlinear optical (NLO) crystals, including aluminum-borate NLO crystals, that have low concentrations of contaminants that adversely affect the NLO crystal's optical properties, such as compounds that contain transition-metal elements and/or lanthanides, other than yttrium, lanthanum, and lutetium. Some NLO crystals with low concentrations of these contaminants are capable of second harmonic generation at very short wavelengths. Also described are embodiments of a method for making these NLO crystals. Some embodiments involve growing a single NLO crystal, such as an aluminum-borate NLO crystal, from a mixture containing a solvent that is substantially free of harmful contaminants. The described NLO crystals can be used, for example, in laser devices.