title: Tin(II) ketoacidoximates: synthesis, X-ray structures and processing to tin(II) oxide.
abstract: Tin(II) ketoacidoximates of the type [HON=CRCOO]2Sn (R = Me 1, CH2Ph 2) and (MeON=CMeCOO)3Sn](-) NH4(+)·2H2O 3 were synthesized by reacting pyruvate- and hydroxyl- or methoxylamine RONH2 (R = H, Me) with tin(II) chloride dihydrate SnCl2·2H2O. The single crystal X-ray structure reveals that the geometry at the Sn atom is trigonal bipyramidal in 1, 2 and trigonal pyramidal in 3. Inter- or intramolecular hydrogen bonding is observed in 1-3. Thermogravimetric (TG) analysis shows that the decomposition of 1-3 to SnO occurs at ca. 160 °C. The evolved gas analysis during TG indicates complete loss of the oximato ligand in one step for 1 whereas a small organic residue is additionally removed at temperatures >400 °C for 2. Above 140 °C, [HON=C(Me)COO]2Sn (1) decomposes in air to spherical SnO particles of size 10-500 nm. Spin coating of 1 on Si or a glass substrate followed by heating at 200 °C results in a uniform film of SnO. The band gap of the produced SnO film and nanomaterial was determined by diffuse reflectance spectroscopy to be in the range of 3.0-3.3 eV. X-ray photoelectron spectroscopy indicates surface oxidation of the SnO film to SnO2 in ambient atmosphere.
authors.affiliation: Physical Sciences and Engineering Division, 4700 King Abdullah University of Science & Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia. alexander.rothenberger@kaust.edu.sa.
authors.forename: Jayaprakash
authors.initials: J
authors.lastname: Khanderi
authors.affiliation: Physical Sciences and Engineering Division, 4700 King Abdullah University of Science & Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia. alexander.rothenberger@kaust.edu.sa.
authors.forename: Bambar
authors.initials: B
authors.lastname: Davaasuren
authors.affiliation: Physical Sciences and Engineering Division, 4700 King Abdullah University of Science & Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia. alexander.rothenberger@kaust.edu.sa.
authors.forename: Buthainah Ameen
authors.initials: BA
authors.lastname: Alshankiti
authors.affiliation: Physical Sciences and Engineering Division, 4700 King Abdullah University of Science & Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia. alexander.rothenberger@kaust.edu.sa.
authors.forename: Alexander
authors.initials: A
authors.lastname: Rothenberger