Abstract
A study was made of the adducts of 1,4,5-trimethyltetrazaboroline with a number of main-group electron acceptors including the trichlorides of boron, aluminium, and gallium, germanium tetrachloride, stannic chloride, and antimony pentachloride. New complexes were isolated from the reactions with the latter two acceptors and with boron trichloride having stoicheiometries SnCl4,2L, SbCl5,L, and BCl3,L, respectively. With titanium tetrachloride, three types of adduct of tetrazaborolines were prepared. Compounds of the stoicheiometries 2TiCl4,1·5L (L = Me2N4BMe, Me2N4BCl and Me2N4BPh), 2TiCl4,L,toluene, (L = Me2N4BMe and Me2N4BCl) and 2TiCl4,-Me2N4BPh,0·5C6H5CH3 were identified. The condensed-phase heats of formation of the complexes between 1,4,5-trimethyltetrazaboroline and boron trichloride, stannic chloride, and antimony pentachloride and of the series 2TiCl4,1·5L were measured by a hydrolytic method in a reaction calorimeter. Attempts were made to measure the heats of vaporisation of some of the complexes in order to derive their gas-phase heats of formation. It is concluded that, towards BCl3, SbCl5, and SnCl4, the tetrazaboroline ring behaves as a monodentate ligand, whilst with TiCl4, bridged complexes are probably formed.
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