Tantalum complexes with all nitrogen coordination sphere: mixed amido-, imido-, guanidinato complexes of tantalum and their thermal behaviour

• Published in: Dalton transactions : an international journal of inorganic chemistry no. 18; p. 3051
• Main Authors: Baunemann, Arne, Rische, Daniel, Milanov, Andrian, Kim, Younsoo, Winter, Manuela, Gemel, Christian, Fischer, Roland A
• Format: Journal Article
• Language: English
• Published: England 21.09.2005
• Subjects: Amides - chemistry; Crystallography, X-Ray; Guanidines - chemistry; Imides - chemistry; Magnetic Resonance Spectroscopy - methods; Models, Molecular; Molecular Conformation; Nitrogen - chemistry; Organometallic Compounds - chemical synthesis; Organometallic Compounds - chemistry; Sensitivity and Specificity; Stereoisomerism; Tantalum - chemistry; Temperature
• ISSN: 1477-9226
• DOI: 10.1039/b503988f

Novel mixed amido-/imido-/guanidinato-complexes of tantalum are reported. The complexes were synthesised by insertion reactions of carbodiimides of the type C(NR)2(R =iso-propyl (i-Pr)) into the M-N bonds of tantalum mixed amido/imido complexes. Three representative complexes were synthesised and fully characterised by 1H-NMR, 13C-NMR, CHN-analysis and mass spectroscopy. The crystal structure of the complex [Ta(NMe2){(i-Pr-N)2C(NMe2)}2(N-t-Bu)](1)(Me = methyl, t-Bu =tert-butyl) is presented and discussed. The complexes are solids that can be quantitatively sublimed at moderate temperatures (120-130 degrees C) without any sign of decomposition. The thermal properties of the new compounds were studied (TGA) and preliminary MOCVD-experiments were performed. TaN films were deposited and characterised by XRD and XPS.