Mensinger Zachary L, Zakharov Lev N, Johnson Darren W
Oregon Nanoscience and Microtechnologies Institute (ONAMI), and Department of Chemistry, 1253 University of Oregon, Eugene, OR 97403-1253, USA.
Acta Crystallogr Sect E Struct Rep Online. 2008 Jan 9;64(Pt 2):i8-i9. doi: 10.1107/S1600536807068067.
The title compound, (NH(4))(3)[GaMo(6)(OH)(6)O(18)]·7H(2)O, contains two centrosymmetric GaMo(6) B-type Anderson cluster units consisting of central GaO(6) octa-hedra surrounded by a hexa-gonal assembly of MoO(6) edge-sharing octa-hedra. Like other B-type Anderson clusters, where the central Mo atom is substituted with a di- or trivalent metal ion, the central six μ(3)-oxido bridges are protonated. The average Ga-O bond length is 1.97 (1) Å, whereas the average Mo-O distances are 2.29 (2), 1.94 (1) and 1.709 (5) Å, respectively, for Mo-(μ(3)-OH), Mo-(μ(2)-O) and Mo=O bonds. In the crystal structure, the Ga(μ(3)-OH)(6)Mo(6)O(18) (3-) polyanionic clusters are surrounded by NH(4) (+) cations and solvent water mol-ecules, forming an extended network of hydrogen bonds.
标题化合物(NH₄)₃[GaMo₆(OH)₆O₁₈]·7H₂O包含两个中心对称的GaMo₆ B型安德森簇单元，由中心GaO₆八面体被MoO₆共边八面体的六边形组装体围绕而成。与其他中心Mo原子被二价或三价金属离子取代的B型安德森簇一样，中心的六个μ₃-氧化桥被质子化。Ga - O平均键长为1.97 (1) Å，而对于Mo-(μ₃-OH)、Mo-(μ₂-O)和Mo = O键，Mo - O平均距离分别为2.29 (2)、1.94 (1)和1.709 (5) Å。在晶体结构中，Ga(μ₃-OH)₆Mo₆O₁₈ (3-)多阴离子簇被NH₄⁺阳离子和溶剂水分子包围，形成氢键的扩展网络。
