Solid-State 69Ga and 71Ga NMR Study of the Nanoscale Inorganic Cluster [Ga13(渭3-OH)6(渭2-OH)18(H2O)24]

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• 作者：Zayd L. Ma ; Katherine M. Wentz ; Blake A. Hammann ; I-Ya Chang ; Maisha K. Kamunde-Devonish ; Paul Ha-Yeon Cheong ; Darren W. Johnson ; Victor V. Terskikh ; Sophia E. Hayes
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：September 9, 2014
• 年：2014
• 卷：26
• 期：17
• 页码：4978-4983
• 全文大小：359K
• ISSN：1520-5002

文摘

Solid-state ⁷¹Ga and ⁶⁹Ga NMR was used to probe the structure of the hydroxo-aquo cluster, [Ga₁₃(渭₃-OH)₆(渭₂-OH)₁₈(H₂O)₂₄](NO₃)₁₅, envisioned as a solution-processable material for thin film electronics. This species, termed Ga₁₃, is made up of three types of 6-coordinate gallium sites, with bridging OH groups and H₂O species decorating the outer edges. Solid-state NMR at two magnetic fields (13.9 and 21.1 T) of these quadrupolar nuclei, in conjunction with modeling, demonstrates that these sites are best represented as distorted octahedra, exhibiting a wide range of distinct quadrupolar couplings and asymmetry parameters. This information is critical for analyses of the local coordination environment for gallium in related gallium-oxide films, and this work adds to the growing body of evidence that gallium solid-state NMR is a useful tool for structural analyses.