A new polyborate anion, [B7O9(OH)(6)](3-) : Self assembly, XRD and thermal properties of s-fac-[Co(dien)(2)][B7O9(OH)(6)]center dot 9H(2)O

作者：Altahan Mohammed A; Beckett Michael A^*; Coles Simon J; Horton Peter N

来源：Inorganic Chemistry Communications, 2015, 59: 95-98.

DOI：10.1016/j.inoche.2015.07.011

• [B7O9(OH)(6)](3-)
• Heptaborate(3-)
• s-fac-[Co(dien)](3+)
• Self-assembly
• XRD structure

The title compound, 3-facAco(dien)(2)][B7O9(OH)(6)]center dot 9H(2)O (1) (dien = HN(CH2CH2NH2)(2)), has been prepared as a crystalline solid in moderate yield (35%) from the reaction of B(OH)(3) with [Co(dien)(2)][OH](3) in aqueous solution (10:1 ratio). The structure contains a novel polyborate anion [B7O9(OH)(6)](3-) which is structurally based on the known 'ribbon' isomer of [B7O9(OH)(5)](2-), with an additional [OH](-) group coordinated to a B atom in one of the outer boroxole rings. Compound 1 is formed by a self-assembly process in which the cation and anion mutually template themselves from equilibrium mixtures under reaction conditions. The [B7O9(OH)(6)](3-) anions are Hbonded to each other in layers with 'cavities' suitable for the [Co(dien](2)](3+) complex. Three[B7O9(OH)(6)](3-) anions are in the secondary coordination sphere (via H-bonds) of each cation, with each anion H-bonded to three cations.

• 出版日期2015-9