Precursor chemistry of Group 13 nitrides XV: synthesis and structure of adduct stabilized bis- and trisazides of indium; thermoanalytic characterisation of py3In(N3)3

The synthesis and properties of {(X)2In[(CH2)3NMe2)]}2 (1: X=Br, 2: X=N3) and (terpy)In(N3)2Y (3: Y=N3; 4: Y=η2-O2C(CH2)2CH2OH) are reported. Compounds 1 and 4 have been characterized by single crystal X-ray diffraction studies. Compound 2 represents the first adduct stabilized and volatile covalent bis azide compound of indium. The pyrolysis of the trisazide py3In(N3)3 (5) was studied by TGA and DSC showing three distinct steps between 100 and 250°C according to loss of pyridine. Due to the low thermal stability of InN the controlled detonation of pure 5 and mixtures of 5 with (Et3N)Ga(N3)3 yields In metal rather than InN or an In1−xGaxN alloy.