In this work, we studied lead(II) and cobalt(II) complexation of derivatives 2-B10H9O(CH2)2O(CH2)2N32− and 2-B10H9O(CH2)5N32− of the closo-decaborate anion containing pendant azido groups in the presence of 1,10-phenanthroline and 2,2′-bipyridyl. Mononuclear PbL2{An} and binuclear Pb2L4(NO3)2{An} lead complexes (where {An} is the N3-substituted boron cluster) were isolated and studied by IR spectroscopy and elemental analysis. The mononuclear lead(II) complex Pb(phen)2B10H9O(CH2)2O(CH2)2N3 and the binuclear lead(II) complex Pb2(phen)4(NO3)2B10H9O(CH2)5)N3 were determined by single-crystal X-ray diffraction. In complex Pb2(phen)4(NO3)2B10H9O(CH2)5)N3, the boron cluster is coordinated by the metal atom only via the 3c2e MHB bonds. In complex Pb(phen)2B10H9O(CH2)2O(CH2)2N3, the coordination environment of the metal includes BH groups of the boron cluster and the oxygen atom of the exo-polyhedral substituent. When the reaction was performed in a CH3CN/water mixture, the binuclear lead(II) complex (Pb(bipy)NO3)(Pb(bipy)2NO3)(B10H9O(CH2)2O(CH2)2N3)·CH3CN·H2O was isolated, where the boron cluster acts as a bridging ligand between lead atoms coordinated by the boron cage via the O atoms of the substituent and/or the BH groups. In the course of cobalt(II) complexation, the starting compound (Ph4P)2B10H9O(CH2)5N3 was isolated and its structure was also determined by X-ray diffraction. Although a number of lead(II) complexes with coordinated N3 are known from the literature, no complexes with the boron cluster coordinated by the pendant N3 group involved in the metal coordination have been isolated.