Premium
Heteroleptic Group 2 Metal Precursors for Metal Oxide Thin Films
Author(s) -
George Sheby Mary,
Park Bo Keun,
Kim Chang Gyoun,
Chung TaekMo
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201301296
Subject(s) - chemistry , homoleptic , barium , strontium , metal , trimer , alkoxide , amide , inorganic chemistry , trimethylsilyl , alkaline earth metal , crystallography , crystal structure , stereochemistry , polymer chemistry , medicinal chemistry , organic chemistry , dimer , catalysis
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.