Details

Autor(en) / Beteiligte

• Heo, Jung Shik
• Cho, Yong Seok
• Kim, Jeong Chan
• Moon, Sang Heup

Titel

Thermal Decomposition of Ti(O–iPr) 2 (dpm) 2 in the Gas Phase

Ist Teil von

• Japanese Journal of Applied Physics, 2005-06, Vol.44 (6R), p.3926

Erscheinungsjahr

2005

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The thermal decomposition of gaseous Ti(O–iPr) 2 (dpm) 2 [O–iPr = isopropoxide, dpm = bis(2,2,6,6-tetramethyl-3,5-heptadionate)], diluted with either argon or air, was investigated using infrared (IR) and mass spectrometry. The activation energies associated with the dissociation of individual bonds constituting the compound were estimated based on IR data obtained when the compound was heated at different rates. Ti(O–iPr) 2 (dpm) 2 was decomposed even during vaporization, which occurred at temperatures near 180°C. In an argon environment, the Ti–O bond connecting the central Ti atom with the O–iPr ligand and the C–C(CH 3 ) 3 bond of the dpm ligand were dissociated at low temperatures, and the C–O bond of the dpm ligand was dissociated at higher temperatures. At temperatures below 300°C, the skeleton of the dpm ligand was preserved, even though the latter had lost the C(CH 3 ) 3 group and was bound to Ti only by one end. The dpm skeleton was decomposed at temperatures higher than 300°C due to the dissociation of C–O and C–C bonds. When the compound was decomposed in air, the sequence for the dissociation was similar to that observed in argon, except that the C–C bond of the dpm ligand was dissociated at lower temperatures than in argon and, accordingly, the dpm skeleton was decomposed at temperatures as low as 250°C. In either case of the two environments, the Ti–O bond connecting Ti to the dpm skeleton was the most stable and its dissociation eventually contributed to the formation of TiO 2 .