Two novel azido-derivatives of closo-dodecaborate anion with hydrophobic and hydrophilic spacers were prepared by reaction of tetrabutylammonium azide with cyclic oxonium derivatives of the closo-dodecaborate anion. The compounds prepared can be regarded as precursors of derivatives of closo-dodecaborate anion with amino group at the terminal position of a spacer or as building blocks for 'click chemistry', which are useful for preparation of various conjugates with targeting molecules. A concentration dependence of the 11 B NMR spectra of functionalized derivatives of closododecaborate anion was discovered, which is of great importance for analytical purposes.
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