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Heteroleptic Group 2 Metal Precursors for Metal Oxide Thin Films
Ist Teil von
European journal of inorganic chemistry, 2014-04, Vol.2014 (11), p.2002-2010
Ort / Verlag
Weinheim: WILEY-VCH Verlag
Erscheinungsjahr
2014
Link zum Volltext
Quelle
Wiley-Blackwell Journals
Beschreibungen/Notizen
A new class of heteroleptic complexes of calcium, strontium, and barium have been synthesized using 1‐{[2‐(dimethylamino)ethyl](methyl)amino}‐2‐methylpropan‐2‐ol (demampH) and 2,2,6,6‐tetramethyl‐3,5‐heptanedione (tmhdH). Complexes [{Ca(demamp)(tmhd)}2] (4), [{Sr(demamp)(tmhd)}2] (5), and [{Ba(demamp)(tmhd)}3] (6) were prepared in two‐step processes. Partially substituted complexes [{Ca(demamp)(btsa)}2] (1), [{Sr(demamp)(btsa)}2] (2), and [{Ba(demamp)(btsa)}2] (3) [btsa = bis(trimethylsilyl)amide] were isolated and characterized. The molecular structures of all the compounds were studied by single‐crystal X‐ray crystallography. The strontium and calcium complexes have dimeric configuration with bridging of two alkoxide oxygen atoms between the metals, whereas the barium complex is a trimer. Complexes 4 and 5 show higher volatility and thermal stability with respect to the homoleptic compounds, while barium complex 6 is unstable. The TG analyses of compounds 4 and 5 display one‐step curves with 9.0 and 9.6 % residue at 375 and 370 °C, respectively.
A proof for the suitable selection of ligands was shown through the design of heteroleptic group 2 metal precursors. High‐quality group 2 metal precursors were achieved by designing heteroleptic complexes containing suitable ligands. Even though the complexes formed as dimers, these compounds exhibit higher stability and volatility than their homoleptic monomeric forms.