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A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
Published on: March 29, 2019
Study of bismuth alkoxides as possible precursors for ALD
Timo Hatanpää1, Marko Vehkamäki, Mikko Ritala
1Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, 00014 University of Helsinki, Finland. Timo.Hatanpaa@helsinki.fi
Abstract:
While searching for bismuth precursors for thin film preparation by atomic layer deposition (ALD) three bismuth alkoxides Bi(O(t)Bu)(3) (1), Bi(OCMe(2)(i)Pr)(3) (2), Bi(OC(i)Pr(3))(3) (3), bismuth beta-diketonate, Bi(thd)(3) (4), and bismuth carboxylate, Bi(O(2)C(t)Bu)(3) (5), were synthesized and evaluated. The compounds were characterized by CHN, NMR, MS, and TGA/SDTA. Earlier unknown crystal structures of compounds 1 and 3 were solved. Compound 1 forms dimeric and loose polymeric structures in the solid state while 3 is strictly monomeric. For compound 2 crystals suitable for complete structure solution could not be grown. Crystallization trials of 2 from hexane and toluene resulted in oxygen bridged tetramer [Bi(2)O(OCMe(2)(i)Pr)(4)](2) (6). Compound 4 has dimeric structure and compound 5 forms loose tetramers as reported earlier. The structure of toluene solvated crystal [Bi(O(2)C(t)Bu)(3)](4).2MeC(6)H(5) (7) was solved. All compounds studied showed relatively good volatility and thermal stability. They were all tested in ALD deposition experiments, in which compound 2 was found to be the most suitable for ALD growth of Bi(2)O(3). It exhibited a clear improvement over Bi precursors studied earlier.
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