Synthesis and structure of a new heptaborate oxoanion isomer: B7O9(OH)5(2-) |
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Authors: | Schubert David M Visi Mandana Z Khan Saeed Knobler Carolyn B |
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Institution: | U.S. Borax Inc., Rio Tinto Minerals, Greenwood Village, CO 80111, USA. dave.schubert@riotinto.com |
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Abstract: | The nonmetal borate H3N(CH2)7NH3]B7O9(OH)5].H2O (1) was prepared via a neat reaction of 1,7-diaminoheptane with excess boric acid under mild nonhydrothermal conditions. Single-crystal X-ray characterization of 1 revealed a new isomer of the heptaborate anion, B7O9(OH)5(2-). The heptaborate anion in 1 is comprised of four fused (BO)3 rings sharing three four-coordinate boron atoms and a single three-coordinate oxygen atom. This anion is a structural isomer of another recently described heptaborate anion, consisting of a chain of three (BO)3 rings. Compound 1 crystallized in the triclinic space group P1 with a=9.3266(17) A, b=10.1222(19) A, c=10.847(2) A, alpha=89.422(2) degrees, beta=82.349(2) degrees, gamma=75.158(2) degrees, V=980.7(3) A3, and Z=2. |
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